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evaluation board user guide ug- 466 one technology way ? p. o. bo x 9106 ? norwood, ma 02062 - 9106, u.s.a. ? tel: 781.329.4700 ? fax: 781.461.3113 ? www.analog.com evaluation board for the adp2384 / adp2386 , 20 v, 4 a/6 a synchronous step - down dc- to - dc regulators please see the last page for an important warning and legal terms and conditions . rev. 0 | page 1 of 12 features input voltage: 4.5 v to 20 v 1% output voltage accuracy integrated mosfet 44 m?/11 m? contin u ous output current 4 a for adp2384 6 a for adp2386 programm able s witching frequency : 2 00 khz to 1.4 mhz synchronizes to external clock : 200 khz to 1.4 mhz 180 out - of - phase synchronization precision enable and power good external compensation internal soft start with external adjustable option startup into prechar ged output general description the adp2384 / adp2386 evaluation bo ard is a c omplete , 4 a /6 a, 20 v, step - down regulator solution that allow s user s to evaluate the performance of the adp2384 / adp2386 with a near ideal printed circ uit board ( pcb ) layout . the switching freque ncy can be programmed between 20 0 khz and 1.4 mhz , or it can be synchronized to an external clock with a 18 0 phase shift, which provides the possibility for a stackable multiphase power solution. the output o f t he adp2384 / adp2386 evaluation board is preset to 3.3 v and t he switching frequency is set to 6 00 khz. different output voltage setting s can be achieved by changin g appropriate passive components . the ambient temperature operating range is ? 40c to + 8 5c. full details on the adp2384 and adp2386 r egulator s are provided in the adp2384 and adp2386 data sheet s, available from analog devices, inc., which should be consulted in conjunction with this user guide. d emo board 10986-001 figure 1.
ug- 466 evaluation board user guide rev. 0 | page 2 of 12 table of contents features .....................................................................................1 general description ..................................................................1 demo board ..............................................................................1 revision history ........................................................................2 using the evaluation board .......................................................3 powering up ..........................................................................3 measuring evaluation board performance ................................3 modifying the board ..............................................................4 evaluation board schematic and artwork ................................ . 5 adp2384 schematic .............................................................. 5 adp2386 schematic .............................................................. 6 pcb layout ............................................................................ 7 ordering information ............................................................... 8 bill of materials ...................................................................... 8 revision history 11 /1 2 r evision 0: initial version
evaluation board user guide ug- 466 rev. 0 | page 3 of 12 using the evaluation board powering up the adp2384 / adp2386 e valuation board is supplied fully assembled and tested. before applying power to the evaluation board, follow the procedures in t his section. jumper j6 (enable) use one of the followin g methods to enable or to disable the regulator : ? to enable the regulator, short the middle pin of j6 , en , to high . ? to dis a b l e the regulator, short the middle pin of j 6, en , to gnd . input power source if the input power source includes a current meter, use that meter to monitor the input current. connect the positive terminal of the power source to j7 ( vin) of the evaluation board , and the negative te rminal of the power source to j14 (gnd) of the eva luation board. if the power source does not include a current meter, connect a current meter in series with the input source voltage. connect the positive lead (+) of the power source to the positive (+) ammeter terminal, the negative lead (?) of the power source to j 14 ( gnd), and the negati ve lead (?) of the ammeter to j7 (vin ). output load before connecting the load, en sure that the board is turned off. connect an electronic load or resist o r to set the load current. c onnect the pos it ive terminal of the load to j 10 ( vout ) o f the evaluation board and connect the nega tive terminal of the load to j13 (gnd). input and output voltmeter measure the input and output voltages using voltmeters. make sure that the voltmeters are connected to the appropriate terminals of evaluation board and not to the load or power source. if the voltmeters are not connected directly to the evaluation board, the measured voltages are incorrect due to the voltage drop across the leads and/or connections between th e evaluation board, the power source, and/or the load. to measure the input voltage, connect the positive terminal of the voltmeter to j8 (vin _sense ) and the negative terminal to j12 (gnd _sense ). likewise, to measure the output voltage, con - nect the positi ve terminal of the voltmeter to j9 ( vout _sense) and the negative terminal to j 15 (gnd _sense ). turning on the evaluation board when the power source and load are connected to the evaluation board, it can be powered for operation. perform the following ste ps to turn on the board : 1. ensure that the power source voltage is > 4.5 v and <20 v. 2. ensure that en is high and monitor the output voltage. 3. tur n o n the load , check that it is drawing the proper load current , and verify that the output voltage maintains its r egulation. measuring evaluation board performance measuring the switching waveform to observe the switching waveform with an oscilloscope, place the oscilloscope probe tip at tes t p oint j11 (sw) with the probe ground at j5 ( gnd ) . set the scope to dc with t he appropriate voltage and time divisions. the switching waveform limits sh ould alternate approximately between 0 v and the input voltage. measuring load regulation load regulation can be tested by observing the change in the output voltage with increasing output load current. to minimize the voltage drop, use short low resistance wires. measuring line regulation vary the input voltage and examine the change in the output voltage with a fixed output current. line transient response generate a step input vol tage change and observe the behavior of the output voltage using an oscilloscope. load transient response generate a load current transient at the output and observe the output voltage response using an oscilloscope. atta ch the current probe to the wire be tween the output and the load to capture the current transient waveform . measuring efficiency the efficiency, , is measured by comparing the input power with the output power. inin out out iv iv = measure the input and output voltages as close as possible to the input and output capacitors to reduce the effect of voltage drop. measuring inductor current the inductor current can be measured by removing one end of the inductor from its pad and connecting a current loop in series . a current probe can be connected onto this wire.
ug- 466 evaluation board user guide rev. 0 | page 4 of 12 measuring output voltage ripple to observe the output voltage ripple, place the oscilloscope probe across the output capacitor with the probe ground lead connected to the negative (?) capacitor terminal and the probe tip place d at the positive (+) capacitor terminal. set the oscilloscope to ac , 10 mv/division, 2 s/division time base, and 20 mhz bandwidth. a standard oscilloscope probe has a long wire ground clip. for high frequency measurements, this ground clip picks up high frequency noise and injects it into the measured output ripple. figure 2 shows an easy way to measure the output ripple properly. it requires removing th e oscilloscope probe sheath and wrapping an un shielded wire around the oscilloscope probe. by keeping the ground length of the oscilloscope probe as short as possible, the true ripple can be measured. 10986-002 figure 2 . measuring output v oltage ripple modifying t he board to modify the adp2384 / adp2386 evaluation board configura - tion, unsolder and/or replace/remove the appropriate passive compo nent s or jumpers on the board. changing the output voltages the output voltage setpoints of the adp2384 / adp2386 can be changed by replacing the r7 and r5 resistors wi th the resistor values shown in table 1 . table 1 . resistive divider for various output voltages v out (v) r7 , 1% (k?) r5 , 1% (k?) 1.0 10 15 1.2 10 10 1.5 15 10 1.8 20 10 2. 5 47.5 15 3.3 10 2.21 5.0 22 3 to limit output voltage accuracy degradation due to the fb pin bias current (0.1 a maximum) to less than 0.5% (maximum), ensure that the bottom divider string resistor , r5 , is less than 30 k?. the top resistor , r7 , value is calculated using the following equations: r7 = r5 ? ? ? ? ? ? ? ? ? v6.0 v6.0 out v w hen the output voltage is changed, the values of the inductor ( l1 ), the output capacitors ( c9, c10 , and c11 ) , and the com - pensation components ( r6 , c2 , and c3 ) must be recalculated and changed to ensure stable operation (see the adp2384 and adp2386 data sheet s for details on external component selection). changing the switching frequency the switching frequency (f sw ) set point can be changed by replacing the r4 resistor with a different value, as shown in the following equation: f sw [khz] = 69, 12 0 / ( r4 [k?] + 15) a 215 k? resistor sets the frequency to 300 khz, and a 100 k ? resistor sets the frequency to 600 khz. w hen the switching frequency is changed, the values of the inductor ( l1 ) , the output capacitors ( c9, c10, c11) , the compensation networks ( r6 , c2, c3 ) must be recalculated and changed for stable operation (see the adp2384 and adp2386 data sheet s for details on external component selection). changing the soft start time the soft start time of the adp2384 / adp2386 on the evalu ation board is programmed to 4 ms. to change the soft start time, t ss , replace the c1 capacitor value using the following equation: c1 [nf] = 5. 33 t ss [ms] exte rnal synchronization to synchronize the regulator to an external clock signal, apply an external clock signal to j1 (sync) of the evaluation board. the clock signal must have a logic high level from 1.3 v to 5 v and a logic low level below 0.4 v. set the external clock pulse width to more than 100 ns and the frequency range between 200 khz and 1.4 mhz. during synchronization, the regulator operates in ccm mode and the switching waveforms rising edge run s 180 out of phase to the external clock rising edge . for reliable synchronization, connect a resistor from the rt pin to gnd (r4 ) to program the internal oscillator to run at 90% to 110% of the external synchronization clock signal.
evaluation board user guide ug- 466 rev. 0 | page 5 of 12 evaluation board sch ematic and artwork adp2384 schematic j8 vin 1 j12 gnd 1 j4 gnd 1 u1 adp2384 comp 1 fb 2 vreg 3 gnd 4 sw1 5 sw2 6 sw3 7 pgnd1 8 pgnd2 9 pgnd3 10 pgnd4 11 pgnd5 12 pgnd6 13 sw4 14 bst 15 pvin1 16 pvin2 17 pvin3 18 pvin4 19 en 20 pgood 21 rt 22 sync 23 ss 24 exp 25 e_sw 26 j2 vreg 1 j15 gnd 1 l1 3.3h 1 2 c9 47f/6.3v j7 vin 1 2 j13 gnd 1 2 j14 gnd 1 2 c5 1f r6 31.6k? c3 1500pf c2 4.7pf c6 0.1f c12 nc c10 47f/6.3v r9 nc j10 vout 1 2 j3 pwg 1 r7 10k? r8 nc c4 nc r5 2.21k? j11 sw 1 j9 vout 1 c1 22nf r4 100k? r2 100k? c11 nc c8 10f/25v c7 10f/25v sw sw j5 gnd 1 r1 nc r3 nc j1 sync 1 j6 en 1 2 3 10986-003 v in = 12v, v out = 3.3v, iout = 4a, f sw = 600khz figure 3 . evaluation board schematic f or adp2384
ug- 466 evaluation board user guide rev. 0 | page 6 of 12 adp2386 schematic j8 vin 1 j12 gnd 1 j4 gnd 1 u1 adp2386 comp 1 fb 2 vreg 3 gnd 4 sw1 5 sw2 6 sw3 7 pgnd1 8 pgnd2 9 pgnd3 10 pgnd4 11 pgnd5 12 pgnd6 13 sw4 14 bst 15 pvin1 16 pvin2 17 pvin3 18 pvin4 19 en 20 pgood 21 rt 22 sync 23 ss 24 exp 25 e_sw 26 j2 vreg 1 j15 gnd 1 l1 2.2h 1 2 c9 47f/6.3v j7 vin 1 2 j13 gnd 1 2 j14 gnd 1 2 c5 1f r6 44.2k? c3 1200pf c2 4.7pf c6 0.1f c12 nc c10 100f/6.3v r9 nc j10 vout 1 2 j3 pwg 1 r7 10k? r8 nc c4 nc r5 2.21k? j11 sw 1 j9 vout 1 c1 22nf r4 100k? r2 100k? c11 nc c8 10f/25v c7 10f/25v sw sw j5 gnd 1 r1 nc r3 nc j1 sync 1 j6 en 1 2 3 10986-004 v in = 12v, v out = 3.3v, iout = 6a, f sw = 600khz figure 4 . evaluation board schematic for adp2386
evaluation board user guide ug- 466 rev. 0 | page 7 of 12 pcb layout 10986-005 figure 5 . layer 1, component side 10986-006 figure 6 . layer 3, power plane 10986-007 figure 7 . layer 2, ground plane 10986-008 figure 8 . layer 4, bottom side
ug- 466 evaluation board user guide rev. 0 | page 8 of 12 ordering informa tion bill of materials table 2. adp2384 qty reference designator desc ription part number/vendor 1 c1 22 nf, 16 v, capacitor, 06 03 grm188r71c223ka01d /murata 1 c2 4.7 pf, 50 v, capacitor, 0603 grm1885c1h4r7cz01d /murata 1 c3 1500 pf, 50 v, capacitor, 0603 grm188r71h152ka01d /murata 2 c 4, c12 optional, capacitor, 0603 option al/murata 1 c5 1 f, 16 v, capacitor, 0603 grm188r61c105ka93d /murata 1 c6 0.1 f, 16 v, capacitor, 0603 grm188r71c104ka01d/murata 2 c7, c8 10 f, 25 v, capacitor, 1206 grm31cr61e106ma12l /murata 2 c9, c10 47 f, 6.3 v, capacitor, 1210 grm32er70j476ke19l /murata 1 c11 optional, capacitor, 1210 optional/murata 1 l1 inductor, fdve1040, l = 3.3 h, i rat = 9.8 a, dcr = 9.2 m? fdve1040 - 3r3m / toko 4 r1, r3, r8 , r 9 optional, resistor, 0603 optional/vishay dale 2 r2, r4 100 k?, 1%, resistor, 0603 crcw0603100kf kea/vishay dale 1 r5 2.21 k?, 1%, resistor, 0603 crcw06032k21fkea/vishay dale 1 r6 31.6 k?, 1%, resistor, 0603 crcw060331k6fkea /vishay dale 1 r7 10 k?, 1%, resistor, 0603 crcw060310k0fkea/vishay dale 1 u1 20 v, 4 a, synchronous, step - down regulator , 24- lead, lfcsp_wq, with exposed paddle s adp2384 /analog devices, inc. 10 j1, j2, j3, j4, j5, j8, j9, j11, j12, j15 test point, 2.54 mm pitch sil vertical pc tail pin header, 6.1 mm mating pin height, tin, sip1 m20 - 9990245/harwin 4 j7, j10, j13, j14 connector, 2.54 mm pitch sil vertical pc tail pin header, 6.1 mm mating pin height, tin, 2 - way, sip2 m20 - 9990245/harwin 1 j6 jumper, 0.1 - inch header, 3 - way, sip3 m20 - 9990346/harwin
evaluation board user guide ug- 466 rev. 0 | page 9 of 12 table 3. adp2386 qty reference designator description part number/vendor 1 c1 22 nf, 16 v, capacitor, 06 03 grm188r71c223ka01d /murata 1 c2 4.7 pf, 50 v, capacitor, 0603 grm1885c1h4r7cz01d /murata 1 c3 1200 pf, 50 v, c apacitor, 0603 grm188r71h122ka01d /murata 2 c 4, c12 optional, capacitor, 0603 optional/murata 1 c5 1 f, 16 v, capacitor, 0603 grm188r61c105ka93d /murata 1 c6 0.1 f, 16 v, capacitor, 0603 grm188r71c104ka01d/murata 2 c7, c8 10 f, 25 v, capacitor, 1206 g rm31cr61e106ma12l /murata 1 c9 47 f, 6.3 v, capacitor, 1210 grm32er70j476ke19l/murata 1 c10 100 f, 6.3 v, capacitor, 1210 grm32er60j107me20l /murata 1 c11 optional, capacitor, 1210 optional/murata 1 l1 inductor, fdve1040, l = 2.2 h, i rat = 11.4 a, d cr = 6.1 m? fdve1040 - 2r2m / toko 4 r1, r3, r8 , r 9 optional, resistor, 0603 optional/vishay dale 2 r2, r4 100 k?, 1%, resistor, 0603 crcw0603100kfkea/vishay dale 1 r5 2.21 k?, 1%, resistor, 0603 crcw06032k21fkea/vishay dale 1 r6 44.2 k?, 1%, resistor, 0603 crcw060344k2fkea /vishay dale 1 r7 10 k?, 1%, resistor, 0603 crcw060310k0fkea/vishay dale 1 u1 20 v, 6 a, synchronous, step - down regulator , 24- lead, lfcsp_wq, with exposed paddle s adp2386 /analog devices, inc. 10 j1, j2, j3, j4, j5, j8, j9, j11, j12, j15 test point, 2.54 mm pitch sil vertical pc tail pin header, 6.1 mm mating pin height, tin, sip1 m20 - 9990245/harwin 4 j7, j10, j13, j14 connector, 2.54 mm pitch sil vertical pc tail pin header, 6.1 mm mating pin height, tin, 2 - way, sip2 m20 - 9990245/harwin 1 j6 jumper, 0.1 - inch header, 3 - way, sip3 m20 - 9990346/harwin
ug- 466 evaluation board user guide rev. 0 | page 10 of 12 notes
evaluation board user guide ug- 466 rev. 0 | page 11 of 12 notes
ug- 466 evaluation board user guide rev. 0 | page 12 of 12 notes esd caution esd (electrostatic discharge) sensitive device . charged devices and circuit boards can discharge without detection. although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy esd. therefore, proper esd precautions should be taken to avo id performance degradation or loss of functionality. legal term s and conditions by using the e valuation board discussed herein (together with any tools, components documentation or support materials, the evaluation board), you are agreeing to be bound by the terms and conditions set forth below (agreement) unless you have purchased the evaluation board, in which case the analog devices standard terms and conditions of sale shall govern. do not use the evaluation board until you have read and agreed to the agreement. your use of the evaluation board shall signify your acceptance of the agreement. this agreement is made by and between you (customer) and analog devices, inc. (adi), with its principal place of business at one te chnology way, norwood, ma 02062, usa. subject to the terms and conditi ons of the agreeme nt, adi hereby grants to customer a free, limited, personal, temporary, non - exclusive, non - sublicensable, non - transferable license to use the evaluation board for evaluation purposes only. customer understands and agrees that the evalu ation board is provid ed for the sole and exclusive purpose referenced above, and agrees not to use the evaluation board for any other purpose. furthermore, the license granted is expressly made subject to the following additional limitations: customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the evaluation board; and (ii) permit any third party to access the evaluation board. as used herein, the term third party includes any entity other than adi, customer, their employees, affilia tes and i n - house consultants. the evaluation board is not sold to customer; all rights not expressly granted herein, including ownership of the evaluation board, are reserved by adi. confidentiality. this agreement and the evaluation board shall all be considered the confidential and proprietary information of adi. customer may not disclose or transfer any portion of the evaluation board to any other party for any reason. upon discontinuation of use of the evaluation board or termination of this agreement, customer agrees to promptly return the evaluation board to adi. additional restrictions. customer may not disas semble, decompile or reverse engineer chips on the evaluation board. customer shall inform adi of any occurred damages or any modifications or alterations it makes to the evaluation board, including but not limited to soldering or any other activity that a ffects the material content of the evaluation board. modifications to the evaluation board must comply with applicable law, including but not limite d to the rohs directive. termination. adi may terminate this agreement at any time upon giving writte n notic e to customer. customer agrees to return to adi the evaluation board at that time. limitation of liability. the evaluation boar d provided hereunder is provided as is and adi makes no warranties or representations of any kind with respect to it. adi specifically disclaims any representations, endorsements, guarantees, or warranties, express or implied, related to the evaluation board including, but not limited to, the implied warranty of merchantability, title, fitness for a particul ar purpose or noninfrin gement of intellectual property rights. in no event will adi and its licensors be liable for any incidental, special, indirect, or consequential dam ages resulting from customers possession or use of the evaluation board, including but not limited to lost profits, delay costs, labor costs or loss of goodwill. adis total liability from any and all causes shall be limited to the amount of one hundred us dollars ($100.00). export. customer agrees that it will not directly or indirectly export the evalua t ion b oard to another country, and that it will comply with all applicable united states federal laws and regulations relating to exports. governing law. this agreement shall be governed by and const rued in accordance with the substantive laws of the commonweal th of massachusetts (excluding conflict of law rules). any legal action regarding this agreement will be heard in the state or fede ral courts having jurisdiction in suffolk county, massachusetts, and customer hereby submits to the personal jurisdiction and venue of such courts. the united nations convention on contracts for the international sale of goods shall not apply to this agreement and is expressly disclaimed. ? 2012 analog devices, inc. all rights rese rved. trademarks and registered trademarks are the property of their respective owners. ug10986 -0- 1 1 / 12(0)

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