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MP161 p ower s olution with ultra - low standby power , integrate d switching regulato r , linear regulator , and relay driver MP161 r ev . 1.0 www.monolithicpower.com 1 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. description the MP161 integrates a 700v switching regulator, a low - dropout linear regulator, and two channel relay drivers. the MP161 also has a special standby mode to minimize standby power. the MP161 is designed for home automation, industrial automation , and any other applications that adopt relays and mcus. the 700v switching regulator adopts c onstant v oltage (cv) regulation with internal loop compensation. light - load efficiency i s optimized by proper modulation of the switching frequency and peak current. various protections are also included to guarantee r eliable operation . the integrated low - dropout linear regulator is able to operate with an input up to 30v . the output voltage is fixed at e ither 5v or 3.3v . the MP161 also has o ver - t emperature p rotection (otp) . built - in rel ay drivers are intended to drive up to two relays using the switching regulator output. freewheel ing diodes are integrated to cut down external components . when standby mode enabled , the switching regulator output voltage is lo wered to reduce power consumption. the MP161 is available in a soic - 16 package. part number typical switching regulator peak current limit typical hv mosfet r ds ( on ) ldo out put voltage mp16 1 a - 33* 2 4 0 ma 1 7 ? 3.3 v mp16 1 a - 5 5 v mp16 1 b - 33 * 420 ma 14 ? 3.3 v mp16 1 b - 5* 5 v mp16 1 c - 33* 660 ma 13.5 ? 3.3 v mp16 1c - 5 * 5 v * parts are under development . all following description s and data related to these parts are subject to change . features 700v switching regulator ? integrated 700v mosfet and current source ? constant voltage ( cv ) regulation with internal loop compensation ? optimized light - load efficiency by frequency modulation ? s tandby mode ? anti - audible noise operation by peak current modulation ? adjustable or fixed 12v output ? low operating current ? over - temperature protection ( otp ) , short - circuit protection ( scp ) , over load protection ( olp ) , and over - voltage protection ( ovp ) low - dropout linear regulator ? up to 30v input voltage ? fixed output , with 3.3v and 5v option s ? over - temperature protection ( otp ) relay driver ? 2 on state resistance ? rail voltage up to 30v ? integrated freewheeling diode ? nominal off driver applications ? home/industrial automation ? small appliance s all mps parts are lead - free , halogen - free , and adhere to the rohs directive. for mps green stat us, please visit the mps website under quality assurance. mps and the future of analog ic technology are registered trademarks of monolithic power systems, inc.
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 2 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. typical application v in + ldo drain vin relay driver vo ina outa 700 v switching regulator gnd source inb outb vcc stby v out 1 v out 2 fb
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 3 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. ordering information part number* packa ge top marking MP161ags - 5 soic - 16 see below * for tape & reel, add suffix C z ( e.g. mp 161ag s - 5 C z) top marking mps: mps prefix y y : year code w w : week code mp 161a - 5 : p art number lll llllll : lot number packa ge reference top view soic - 16 d r a i n g n d i n a i n b s t b y o u t a o u t b v c c v o v i n s o u r c e g n d f b n c n c n c
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 4 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. absolute maximum rat ings (1) drain to source ..................... - 0. 3 v to 700 v vcc to source ........................... - 0.3v to 30 v fb to source ................................ - 0.3v to 7 v source to gnd ......................... - 15 v to 700v stby, ina, inb, vo to gnd ............ - 0. 3 v to 7 v v in , outa, outb to gnd ............ - 0.3 v to 30 v continuous power dissipation (t a = + 25 c) (2) ................................ ................................ 1. 56 w junction temper ature ............................... 150 c lead temperature ................................ .... 260 c storage temperature ................ - 6 0 c to + 150 c esd charged device model ...................... 2.0 kv recommended operating conditions ( 3 ) junction t emp erature (t j ) ........ - 40 c to +125 c thermal resistance ( 4 ) ja jc soic - 16 ................................ 80 ....... 30 ... c/w notes : 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction - to - ambient thermal resistance ja , and the ambient temperature ta. t he maximum allowance continuous power dissipation at any ambient temperature is calculated by p d (max)=(t j (max) - t a )/ ja . exceeding the maximum allowance power dissipation produces an excessive die temperature, causing the regulator to go into thermal shutdown. i nternal thermal shutdown circuit protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51 - 7, 4 - layer pcb .
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 5 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. electrical character istics vcc = 1 2 v, vin = 12v, t j = - 40c ~ 125c, m in and m ax values are guaranteed by c haracterization, typical values are tested under t j = 25c, unless otherwise specified. ( 5 ) parameter symbol condition min typ max units high - vol tage (hv) current source and i nternal mosfet ( drain ) internal hv current source supply current for vcc regulat ion i regulator vcc = 4 v , v d rain = 1 00v 2.2 4.1 6 ma drain leakage current i leak v drain = 400v 10 17 a breakdown v oltage v (br)dss t j = 25 c 700 v on resistance r on MP161ags - 33, m p161ags - 5, t j = 25 c 17 20.5 ? MP161ags - 33, MP161ags - 5, t j = 1 25 c 2 4 28 MP161bgs - 33, MP161bgs - 5, t j = 25 c 14 MP161cgs - 33, MP161cgs - 5, t j = 25 c 13.5 maximum on time t max on MP161ags - 33, MP161ags - 5, MP161bgs - 33, MP161bgs - 5, MP161cgs - 33, MP161cgs - 5 21 2 5 30 s minimum off time t min off MP161ags - 33, MP161ags - 5, 7 9 .5 12 s MP161bgs - 33, MP161bgs - 5, MP161cgs - 33, MP161cgs - 5 12 olp delay cycles t of f = t min off 8192 supply voltage management (vcc ) i nternal hv current source turn o ff t hreshold v hvoff 4.4 4.6 5 4. 9 v i nternal hv current source turn o n t hreshold v hvon 3. 8 5 4 .1 4 . 3 v uvlo upper threshold v cch v hvoff v uvlo lower threshold v ccl 3 .4 3. 6 3. 75 v hysteresis of hv current source turn on threshold and uvlo low er threshold v hvon - v ccl 350 mv threshold to reset protections v cc pro 2 .4 2.7 v r egulating voltage ( threshold to turn on mosfet) v ccref fb open 11. 9 12 .5 1 3 v regulating reference in standby mode v cc stby 5. 4 5.7 6 v ic consumption i cc f s = 50khz 600 a ic consumption, latch - off phase i cc l vcc = 5 v 20 2 8 a feedback ( fb ) reference voltage (threshold to turn on mosfet) v ref 1.175 1.225 1.275 v internal lower resistor r low 450 k internal upper r esistor r up 4.1 m
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 6 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. electrical character istics (continued) vcc = 12 v, vin = 12v, t j = - 40c ~ 125c, m in and m ax values are guaranteed by characterization, t yp ical val ues are tested under t j = 25c, unless otherwise specified. ( 5 ) parameter symbol condition min typ max units internal current sense ( source ) peak current limit i limit MP161ags - 33, MP161ags - 5, t j = 25 c 2 1 8 240 2 6 2 ma MP161bgs - 33, MP161bgs - 5, t j = 25 c 420 MP161cgs - 33, MP161cgs - 5, t j = 25 c 660 leading - edge blanking t leb1 350 ns scp threshold i scp MP161ags - 33, MP161ags - 5, t j = 25 c 455 5 25 590 ma MP161bgs - 33, MP161bgs - 5, t j = 25 c 630 MP161cgs - 33, MP161cgs - 5, t j = 25 c 990 leading - edge blanking for scp ( 6 ) t leb2 180 ns control inputs ( stby, ina, inb ) low - level input voltage v il - u 0.8 v high - level input voltage v ih - u 2.0 v input hysteresis v hys _inx 0. 23 v stby i nput hysteresis v hys _stby 0. 18 v internal pull - down resistor r pull - down 450 k relay drivers ( outa, outb ) breakdown v oltage v (br)rd 30 v mosfet on s tate r esistance r on i outa/b = 5 0ma 2 3 off state l eakage c urrent i lk (off) v s ource = 400v 1 a turn - on delay t d(on) 50 ns turn - off delay t d(o ff ) 100 ns voltage d rop on freewheeling diode v f i f = 1 0 0 ma , out a/b to vin 1 v
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 7 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. electrical character istics (continued) vcc = 12 v, vin = 12v, t j = - 40c ~ 125 c, m in and m ax values are guaranteed by characterization, t yp ical values are tested under t j = 25c, unless otherwise specified. ( 5 ) parameter symbol condition min typ max units linear regulator ( vin, vo ) input over - voltage protection v ovp 2 6.5 2 8 29 v ovp discharge current i ovp v in = 30v 5 ma vin uvlo upper threshold v inh 3.9 4.2 4.5 v vin uvlo lower threshold v in l 3.5 3.75 4 v output voltage v o MP161ags - 5, MP161 b gs - 5 , MP161 c gs - 5 4.9 5 5.1 v MP161ags - 33, MP161bgs - 33, MP161cgs - 33 3.3 quiescent current i q in MP161ags - 5, MP161bgs - 5, MP161cgs - 5, v in = 5 .5 v 2 40 a line r egulation ( 7 ) MP161ags - 5, MP161bgs - 5, MP161cgs - 5, i out = 1 ma, vin = 5.4v - 24 v 0.0 05 0.0 1 %/v load r egulation ( 8 ) MP161ags - 5, MP161bgs - 5, MP161cgs - 5, i out = 1ma to 100ma 0.00 5 0.01 %/ma dropout voltage v drop MP161ags - 5, MP161bgs - 5, MP161cg s - 5, i out = 5 0ma , vin to vo, vin = 4.9v 300 mv over - temperature protection thermal shutdown threshold ( 6 ) 1 5 0 c thermal shutdown recovery hysteresis ( 6 ) 30 c note s : 5) th e v alues on drain , vcc , and fb are all referenced to source . the v alue s on vin, vo, ina, inb, outa, outb , and stby are all referenced to gnd , unless otherwise specified . 6) guaranteed by characterization. 7) line regulation = 8) load regulation = ) v / (% v ) vin vin ( v v ) nom ( o ) min ( ) max ( ] vin [ o ] vin [ o ) min ( ) max ( ? ? ? ? ) ma / (% v ) i i ( v v ) nom ( o ) min ( out ) max ( out ] i [ o ] i [ o ) min ( out ) max ( out ? ? ? ?
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 8 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. typical charac teristics i regulator @ v dra i n = 100v vs. temperature r ds ( on ) vs. temperature t minoff (MP161a x ) vs. temperature t maxon (MP161a x ) vs. temperature vcc ref vs. temperature v cc stby vs. temperature 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 - 50 0 50 100 150 i regulat or (ma) temperature ( ) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 - 50 0 50 100 150 r on normalized to 25 temperature ( ) 9.0 9.2 9.4 9.6 9.8 10.0 - 50 0 50 100 150 t minoff (s) temperature ( ) 24.0 24.5 25.0 25.5 26.0 26.5 27.0 - 50 0 50 100 150 t maxon (s) temperature ( ) 12.3 12.4 12.5 12.6 12.7 - 50 0 50 100 150 v ccref (v) temperature ( ) 5.5 5.6 5.7 5.8 5.9 - 50 0 50 100 150 v cc_stby (v) temperature ( )
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 9 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. typi cal characteristics ( continued ) t leb1 vs. temperature v ref vs. temperature v (br)rd vs. temperature v ovp vs. temperature vs. i qin @ vin = 5.5v vs. temperature v o ( MP161 x - 5) vs. temperature 340.0 345.0 350.0 355.0 360.0 365.0 370.0 - 50 0 50 100 150 t leb1 (ns) temperature ( ) 1.20 1.21 1.22 1.23 1.24 - 50 0 50 100 150 v ref (v) temperature ( ) 30.0 31.0 32.0 33.0 34.0 35.0 - 50 0 50 100 150 v (br)rd (v) temperature ( ) 27.0 27.5 28.0 28.5 29.0 - 50 0 50 100 150 v ovp (v) temperature ( ) 0.15 0.17 0.19 0.21 0.23 0.25 - 50 0 50 100 150 i qin (ma) temperature ( ) 4.9 5.0 5.0 5.1 5.1 - 50 0 50 100 150 v o (v) temperature ( )
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 10 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. typic al performance chara cteristics performance waveforms are tested with the evaluation board in the design example section. v in = 230v, v out1 = 12v, i out1 = 70ma , v out2 = 5v, i out2 = 5 0ma , t a = 25c, unless otherwise noted. normal operation full load start - up no load ch 1: v ds 200 v/div. ch 2 : v out1 10 v/div . ch 3 : v out2 5 v /div. ch 4 : i l 2 00ma /div. ch 1: v ds 200v/div. ch 2 : v out1 10 v/div . ch 3 : v out2 5 v/div. ch 4 : i l 2 00ma/div. 4 s/div. 4m s/div. start - up full load v out1 short circuit full load ch 1: v ds 200v/div. ch 2 : v out1 10 v/div . ch 3 : v out2 5 v/div. ch 4 : i l 2 00ma/div. ch 1: v ds 200v/div. ch 2 : v out1 10 v/div . ch 3 : v out2 5 v/div. ch 4 : i l 5 00ma/div. 10 m s/div. 2 00 m s/div. v out2 short circuit full load v out1 ovp no load ch 1: v ds 200v/div. ch 2 : v out1 10 v/div . ch 3 : v out2 5 v/div. ch 4 : i l 500ma/div. ch 1: v ds 200v/div. ch 2 : v out1 10 v/div . ch 3 : v out2 5 v/div. ch 4 : i l 2 00ma/div. 200m s/div. 200 m s/div.
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 11 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. typical performance characteristics (continued) performance waveforms are tested with the evaluation board in the design example section. v in = 230v, v out1 = 12v, i out1 = 70ma , v out2 = 5v, i out2 = 5 0ma , t a = 25c, unless otherwise noted. v out1 olp ful l load standby entry no load ch 1: v ds 200v/div. ch 2 : v out1 10 v/div . ch 3 : v out2 5 v/div. ch 4 : i l 500ma/div. ch 1 : v ds 200 v/div. ch 2 : v out1 10 v/div . ch 3 : v stby 5 v/div. ch 4 : i l 2 00ma/div. 200 m s/div. 4 00 m s/div. s tandby recovery no load sta ndby entry i out1 = 0a, i out2 = 50ma ch 1 : v ds 200 v/div. ch 2 : v out1 10 v/div . ch 3 : v stby 5 v/div. ch 4 : i l 2 00ma/div. ch 1 : v ds 200 v/div. ch 2 : v out1 10 v/div . ch 3 : v stby 5 v/div. ch 4 : i l 2 00ma/div. 4 m s/div. 4 0 m s/div. standby recovery i out1 = 0 a, i out2 = 50ma relay 1 turn - on no load ch 1 : v ds 200 v/div. ch 2 : v out1 10 v/div . ch 3 : v stby 5 v/div. ch 4 : i l 2 00ma/div. ch 1: v ds 200v/div. ch 2 : v outa 10 v/div . ch 3 : v ina 5 v/div. ch 4 : i l 2 00ma /div. 2 m s/div. 200 m s/div.
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 12 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. typical performance charac teristics (continued) performance waveforms are tested with the evaluation board in the design example section. v in = 230v, v out1 = 12v, i out1 = 70ma , v out2 = 5v, i out2 = 5 0ma , t a = 25c, unless otherwise noted. relay 1 turn - off no load relay 2 turn - on no load ch 1: v ds 200v/div. ch 2 : v outa 10 v/div . ch 3 : v ina 5 v/div. ch 4 : i l 2 00ma /div. ch 1 : v ds 200 v/div. ch 2 : v outb 10 v/div . ch 3 : v inb 5 v/div. ch 4 : i l 2 00ma/div. 200 m s/div. 200 m s/div. relay 2 turn - off no load ch 1 : v ds 200 v/div. ch 2 : v out b 10 v/div . ch 3 : v in b 5 v/div. ch 4 : i l 2 00ma/div. 20 0 m s/div.
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 13 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. pin functions soic - 16 pin # name description 1 inb logic input for relay driver C channel b . 2 ina logic input for relay driver C channel a . 3 stby l ogic input for standby mode control. set stby to the low - level input for normal operation. set stby to the high - level input for standby operation. 4, 1 4 gnd ground. 5 vo low - dropout l inear regulator output . 6, 7, 12 nc no connect ion . 8 drain drain of the internal 700v mosfet . drain is also the input of the high - voltage current source . 9 vcc power supply for the 700v switching regulator. vcc a cts as the feedback input when the internal fixed output is enabled or in standby mode. 1 0 fb f eedback input for the 700v switching regulator. connect external re sistors to fb to implement the adjustable output . otherwise, the internal fixed output is enabled . 1 1 source source of the internal 700v mosfet. 1 3 vin low - dropout l inear regulator input . vin is the power supply for the standby control and relay drive r circuit. 1 5 outa relay driver output C channel a . 16 outb relay driver output C channel b .
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 14 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. block diagram figure 1 : functional block diagram v c c f b d r a i n s o u r c e v i n o u t a o u t b s t b y i n a i n b v o f e e d b a c k c o n t r o l d r i v i n g s i g n a l m a n a g m e n t r e l a y d r i v e r p o w e r m a n a g m e n t p e a k c u r r e n t l i m i t a t i o n r e l a y d r i v e r g n d l d o
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 15 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. operation the MP161 integrates a 700v switching regulator, a low - dropout linear regulator, and relay drivers . the MP161 is a n integrated power stage solution for home automation, industrial au tomation , and any other applications that adopt relays and mcus . high voltage (hv) current source and vcc under - voltage lockout (uvlo) the internal high - vo ltage ( hv ) current source regulat es vcc by drawing current from drain . w hen vcc reaches v hvoff , t he ic starts switching , and the internal hv current source is turned off. the internal hv curr ent source turns on again when vcc falls below v hvon . during start - up under normal operation, t he MP161 vcc voltage is always regulated above v hvon . a very small vcc capacitor ca n be used (in the low f or hundreds of nf range ) . vcc u nder - v oltage l ock o ut (uvlo) terminate s the switching when vcc is lower than v ccl to p revent errors caused by an insufficient supply voltage. the ic can shut down until vcc is charged to v hvoff again. this does not occur , typically , because the hv current source turn s on to supply vcc as soon as v cc drops to v hvon , which prevents it from dropping to v ccl (see figure 2) . figure 2 : hv current source and vcc operation soft start (ss) the MP161 starts switching with a s oft - s tart period w hen the device power s on or re sume s operation from a protection mode . soft start prevents the inductor current from overshoot ing . the MP161 implements soft start by decreasing the minimal off time gradually in eight steps. the re are 640 switching cycles in the soft start . during soft start, short - circuit protection ( scp ) and overload protection ( olp ) are disabled. constant voltage operation the MP161 integrates a 700v switching regulator that regulates the output voltage by detecting the feedback ( fb ) . t he internal mosfet is turned on when the fb voltage (v fb ) is lower than the refer ence voltage ( v ref ) and is turned off based on the peak - current limitation (see figure 3) . in this way, v fb is regulated at v ref . the outp ut voltage is determined in eq uation (1): (1) figure 3 : constant voltage regulation an internal resistor divider connected to vcc and fb provides a fix ed output feedback . the lower resistor of the internal feedback divider is 450k ? , typically . t o achieve an adjustable output , an external feedback divider with a much smaller resistance should be connected to fb so that the internal feedback is overridden . a vcc capacitor is used for sampling and holding the output voltage in addition to supply ing the ic operation. low low up ref o r r r v v ? ?
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 16 8/4/2017 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. frequency and peak current foldback due to the constant voltage regulation scheme adopted by the MP161, its switching frequency decrease s as the load reduces. t he MP161 peak current fold s back a long with the switching frequency . as a result, the MP161 is able to achieve excellent overall efficiency . the switching frequency for continuous conduction mode (ccm) can be calculated with equation (2) : (2) the switching frequency for discontinuous conduction mode (dcm) can be calculated with equation (3): (3) w hen the switching frequency drop s in to the audible frequency range u nder very light - load condition, t he peak current fol d s back to its minimal value to minimize the audible noise . leading - edge blanking an internal leading - edge blanking (leb) unit prevents premature switching pulse termination due to a turn - on spike . the spike is mainly caused by parasitic capacitance and reverse recovery of the freewheeling diode (under ccm ) . protections for the switching regulator whenever a protection condition is triggered, t he ic stops switching , the internal hv current source is disabled, and the vcc capacitor is discharged by i ccl . the internal hv current source is not enabled again until vcc drops below v cc pro . the MP161 includes four types of protection. 1. over load protection (olp) : the m aximum output power of the switching regulator is limited by the maxim um switchin g frequency and peak current limit. i f the load exceed s the power limit , the output voltage is not able to stay in regulation. olp is triggered w hen the mosfet off time is at the t offmin limitation ( which indicates that the switching frequency has reac he d the maximum ) for 8192 consecutive cycles . the validation time for olp is able to prevent tripping during start - up and transient periods. 2. short - circuit protection (scp) : if the current flow ing through the internal mosfet after leb2 is higher than the scp threshold, scp is triggered immediately. scp is disabled during soft start . 3. over - temperature protection (otp ) : t o prevent any thermal - induced damage, the MP161 is shut down when the junction temperature exceeds the thermal shutdown threshold . there is also a hysteresis implemented for otp, so the chip does not recover until the junction temperature drop exceeds the thermal shutdown recovery hysteresis . 4. brown - out protection (bop) : if the turn - on time hit s the maximum limitation for four consecutive cycles, bop is triggered. low - dropout linear regulator (ldo) the MP161 integrates a low - dropout linear regulator (ldo) . usually, the ldo input (vin) is connect ed to the output of the switching regulator . vin can adapt to any input voltage below v ovp . the output voltage of the ldo is internally fixed with two options for fixed voltage outputs ( 5v and 3.3v ) . the ldo itself also implem ents otp, which is independent from the switching regulator. however, the protection scheme is similar to the switching regulator s scheme . relay drivers the MP161 integrates two channels of relay drivers, which are compatible to 3.3 - 5v coms logic and ttl logic interface. a low - impedance mosfet is used to drive the relay (see figure 4) . t here is also a n integrated freewheeling diode to take over the relay coil current when the mosfet turn s off . a n r - c filter is implemented internally for each channel to improve noise immunity. the dr ivers also feature an internal pull - down resistor to allow for tri - state input and normal off operation. in o o s peak o in (v v ) v f 2l(i i ) v ? ?? ? ? ?? in o o o s 2 peak in 2(v v ) i v f li v
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 17 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. figure 4 : block diagram of internal relay driver ovp on vin a propriety ovp feature is implemented in the MP161. when the voltage on vin exceeds v ovp , the switching regulator is shut down to stop energy from flowing to the output any further. there is also an internal current pulled from vin to help discharge the externa l capacitor when ovp is triggered. this protection feature can prevent damage on critical load s from over - stress when vin regulation fail s . standby mode operation the MP161 can switch be tween normal operation mode and standby mode according to the input on stby. when stby is low, the MP161 works in normal mode , and the output voltage of the switching regulator is regulated based on v cc ref (fixed output) or v ref (adjustable o utput). when stby is high, the chip works in standby mode, and the switching regulator output is regulate d a t v cc stby . standby mode is used to save power by reducing the switching regulator output voltage when the load on this output rail is idle . when entering standby mode , t he vcc regulating voltage drops step - by - step t o keep the output properly regulated . there is also a soft - start procedure when exiting standby mode. vin outx inx gnd
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 18 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. application informat ion selecting the i nput capacitor t he input capacitor suppl ies dc input voltage to the converter. figure 5 shows the typical dc bus voltage waveform of the half - wave rectifier and full - wave rectifier. figure 5 : input voltage waveform typically, the use of a half - wave rectifier requires an input capacitor rated at 3 f/w for the universal input condition. when using a full - wave rectifier, the input capacitor is rated a t 1.5 ~ 2 f/w for the universal input cond ition . the half - wave rectifier is recommended for <2w output application s. the full - wave rectifier is recommended for >2w output app lication s . avoid using an input capacitor that is too small , since it may not be able to hold the dc voltage high enough. a low dc input voltage can lead to bad thermal performance . if the input voltage is very low, the mosf e t on time may reach t maxon , triggering brown - out protection . selecting the inductor the MP161 has a minimum off - time limit that determines the maximum output power . the maximum power incre ases as the inductor increases. using a very small inductor may cause not enough output power , but a larger inductor leads to a n inappropriate olp point . select an inductor with a minimum value that can meet the over load requirement . the t olerance of the peak - current limit and mini mum off time should also be consider ed f or mass production . estimate the olp point for ccm with eq uation ( 4 ) : ( 4 ) estimate the olp point for dcm with equation (5): ( 5 ) to reduce cost s , use a standard off - the - shelf inductor no less t han the calculated value. selecting the freewheeling diode the diode should be selected based on the maximum input voltage and peak current. the freewheeling diodes reverse recovery can affect efficiency and circuit operation for ccm . use an ultra - fast reverse recovery diode , such as the u gc10jh. selecting the o utput capacitor an output capacitor is required to maintain the dc output voltage. estimate the output voltage ripple for ccm with equation ( 6 ) : ( 6 ) estimate the output voltage ripple for dcm with equation (7 ) : ( 7 ) low esr electr olytic or ceramic capacitors are recommended to reduc e the output voltage ripple if necessary . external feedback resistors for adjustable output configuration s , t he total external resist ance should not exceed 100k to override the internal feedback resistor divider. the external resistor value can also be adjusted to meet the output voltage target i f large external resistor s are preferred . vin dc input voltage t v dc ( min ) v dc ( max ) ac input voltage vin dc input voltage t v dc ( min ) v dc ( max ) ac input voltage o min off o max o limit v p v (i ) 2l ? ?? 2 o max limit min off 11 p li 2 ? ? out _ ripple esr so i v ir 8f c ? ? ? ? 2 pk o o out _ ripple pk esr s o pk ii i v i r f c i ?? ? ?? ?? ?? ??
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 19 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. feedback capacitor the feedback capacitor provides a sample - and - hold function. for both fixed and adjustable output setups, vcc is used as the feedback capacitor. a 1 f vcc capacitor is recommended , typically , but the optimized vcc capacitor may vary in different application s . a l arge vcc capacitor is pre ferred since it results in small no - load consumption and good light - load regulation , and also helps increase the hiccup duration during protection s . however, stability may be affected when the feedback capacitor is too large . dummy load a dummy load is required to maintain the switching regulator output voltage under no - load condition. the switching regulator delivers a certain amount of power under no - load condition due to a minimum switching frequency determined by the feedback r - c discharge rate. this power is dissipated by t he dummy loa d so that output voltage does not run away. a large dummy load current leads to better regulation but larger no - load consumption . the current is a compromise between small n o - load consumption and good no - load regulation. typically, a resistor is used as a dummy load. in figure 7 , the dummy load resistor is not used because there is already ~ 250 a of c onsumption current on vin , which can act as a dummy load. surge performance the input capacitor can also be used for surge suppression . there is no need to use other surge suppression components if an a ppropriate input capacitor value is chosen . figure 6 shows the typical half - wave rectifier used in low - power off line application s . table 2 shows the capacitance required under normal condition s for different surge level s . fr1 is a 20 /2w fused resistor , and l1 is 1mh for this recommendation. figure 6 : half - wave rectifier table 2 : recommended capacitance surge voltage 500v 1000v 2000v c1 1 f 2.2 f 3.3 f c2 1 f 2.2 f 3.3 f input and output capacitors of ldo p lace a n input ceramic capacitor ( 1 - 10f) between v in and gnd . a larger value in this range improve s the line transient response. place an output ceramic capacitor (1 - 10f) between vo and gnd. a larger v alue in this range impr ove s load transient response. relay the coil of relay is connected between v in and v out x . pcb layout guide lines efficient pcb layout is critical for stable operation, good emi , and good thermal performance . for best results, follow the guidelines below. 1) minimize the loop area formed by the input capacitor, 700v switching regulator , freewheeling diode, inductor , and output capacitor. 2) place the power inductor fa r away from the input filter w hile keeping the loop area to a minimum . 3) place a bypass capacitor around 47p f between fb and source as close to the ic as possible. 4) c onnect a large copper area to gnd for better ldo thermal pe rformance . l 1 c 1 c 2 n l f r 1
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 20 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. design example table 3 shows a design example for the following application guideline specifications . table 3 : design example v in 85 v ac to 265 v ac v out1 12 v i out1 7 0 ma v out2 5 v i out2 50 ma the detailed application schematic is shown in figure 7 . the typical performance and circuit waveforms are shown in the typical performance characteristics section. for additional device applications, please refer to the related evaluation board datasheet .
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 21 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. typical application circuit figure 7 shows a typical application example of a 12 v / 7 0ma and 5v / 50ma non - isolated power supply using the mp16 1 a gs - 5. figure 7 : typical application with 12 v / 7 0 ma , and 5v / 50ma output l n 3.3f/400v c4 3.3f/400v c5 1mh l1 d3 1n4007 d6 nc d5 stth1r06 gnd vout1 gnd nc c1 nc r2 nc r1 39/1w f1 1f c7 47pf c3 85~265vac 12v/70ma d4 nc d7 1n4007 nc r6 d2 1n4007 nc r5 1mh l2 nc cx1 nc rv1 stby 5v ina inb 1 3 2 4 relay1 1 3 2 4 relay2 vout vout 1 2 3 4 5 p1 header 5v gnd 0 r4 drain 8 stby 3 gnd 4 vo 5 ina 2 inb 1 outb 16 outa 15 gnd 14 vin 13 source 11 fb 10 vcc 9 u1 MP161ags-5 4.7f c8 stby ina inb 5v 1 2 sw1 1 2 sw2 1 2 sw3 100f/25v c6 nc c9 1f c10 d1 nc nc r3 1f c2 vout2 gnd stby ina inb gnd gnd vout2 5v/50ma 1 2 cn1 1 2 cn2
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 22 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. flow chart figure 8 : control f low c hart p o w e r o n v c c > v h v o f f h v c u r r e n t s o u r c e o n s o f t s t a r t v c c < v c c p r o s h u t d o w n h v c u r r e n t s o u r c e n o v p , t s d , s c p f a u l t ? y n s t o p o p e r a t i o n n y v f b > 2 . 5 ? t u r n o n t h e m o s f e t c o u n t s t o 8 1 9 2 ? r e g u l a t e v o u t = v c c = v s t b y v c c < v h v o n n r e s e t c o u n t e r s t b y = 1 ? y n y n n o r m a l o p e r a t i o n ? y i d s > i p e a k ? t u r n o f f t h e m o s f e t y n v c c < v c c l n y y n t o n = t m i n o f f ? n o l p c o u n t e r + 1 y n y s t b y = 0 ? n s o f t s t a r t y y
mp 161 C integrated power solution for home/industrial auto mation MP161 r ev . 1.0 www.monolithicpower.com 23 8/4/2017 mps proprietary information. patent protected. unaut horized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. signal sequence figure 9 : signal evolution in the presence of a fault p o w e r o n n o r m a l o p e r a t i o n h v c u r r e n t s o u r c e f a u l t f l a g v h v o f f v h v o n v c c l v c c p r o v i n o v e r v o l t a g e f a u l t o v e r - l o a d f a u l t c o u n t e r < 8 1 9 2 o v e r - l o a d f a u l t c o u n t e r = 8 1 9 2 s h o r t c i r c u i t f a u l t t h e r m a l s h u t d o w n f a u l t d r i v e r v c c v o u t u n p l u g f r o m m a i n i n p u t b r o w n o u t f a u l t d r i v e r p u l s e s 8 1 9 2 c y c l e s
mp 161 C integrated power solution for home/industrial auto mation notice: the information in this document is subject to change without notice. please contact mps for current specifications. users should warrant and guarantee that third party i ntellectual p roperty r ights are not infringed upo n when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP161 r ev . 1 .0 www.monolithicpower.com 24 8/4/2017 mps pro prietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. package information soic - 16

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