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1. general description the ssl1523a is a switched mode power su pply (smps) controller ic that operate directly from the rectified univ ersal ac mains. it is implemented in the high-voltage easy high voltage silicon-on-insulator (ez-hv so i) process, combined with a low-voltage bipolar complementary metal oxide semiconductor (bicmos) process. the device includes a high-voltage power switch and a star t-up circuit that operates directly from the rectified mains voltage. a dedicated circuit for valley switching is built in, which makes a very efficient slim-line electronic concept for solid state lighting applications possible. the ssl1523a can operate in applicatio ns with a power range of up to 15 w. in the most basic applications, the ssl1523a act as a voltage source. here, no additional secondary electronics are required. a combined voltage and current source can be realized with minimum costs for external components. implementation of the ssl1523a renders an efficient and low cost powe r supply system for mains led drivers. 2. features and benefits ? designed for mains led drivers up to 15 w ? integrated power switch: 6.5 ; 650 v ? operates from universal ac mains supplies (80 v to 276 v) ? adjustable frequency for flexible design ? rc oscillator for load insensit ive regulation loop constant ? valley switching for minimum switch-on loss ? low standby power (< 100 mw) with frequency reduction at low power outputs ? adjustable overcurrent protection ? undervoltage protection ? temperature protection ? simple application with both primar y and secondary (opto) feedback ? available in a dip8 package ssl1523a smps ics for mains led drivers rev. 1 ? 25 april 2012 product data sheet
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 2 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers 3. applications ? retro-fit led lamps ? led ballasts ? contour lighting ? channel letter lighting ? commercial lighting, such as cabinet or freezer lights ? other lighting applications 4. quick reference data 5. ordering information table 1. quick reference data symbol parameter conditions min typ max unit v drain voltage on pin drain dmos power transistor; t j >0 c ? 0.4 - +650 v r dson drain-source on-state resistance i source = ? 0.50 a t j =25 c- 6 . 5 7 . 5 t j =100 c - 9.0 10.0 v cc supply voltage continuous ? 0.4 - +40 v f osc oscillator frequency 10 100 200 khz i drain current on pin drain v drain >60v no auxiliary supply - 1.5 2 ma with auxiliary supply - 30 125 a table 2. ordering information type number package name description version SSL1523AP dip8 plastic dual in-line pa ckage; 8 leads (300 mil) sot97-1
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 3 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers 6. block diagram 7. pinning information 7.1 pinning fig 1. block diagram aaa-002488 protection logic logic supply SSL1523AP valley power - up reset thermal shutdown oscillator stop low freq 100 mv 0.5 v blank overcurrent 10 x 2.5 v f 1.8 u 1 2 3 4 8 7 6 5 drain n.c. gnd source aux reg rc v cc fig 2. pinning diagram (dip8) SSL1523AP v cc drain gnd n.c. rc source reg aux aaa-002489 1 2 3 4 6 5 8 7
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 4 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers 7.2 pin description 8. functional description the ssl1523a is the heart of a compact flyba ck converter, with the ic placed at the primary side. the auxiliary winding of the transformer can be used for indirect feedback to control the isolated output. this additional winding also powers the ic. a more accurate control of the output voltage and/or current can be implemented with an additional secondary sensing circuit and optocoupler feedback. the ssl1523a uses voltage mode control. th e switching frequency is determined by the maximum transformer demagnetizing time and th e frequency of the oscillator. in the first case, the converter operates in the self os cillating power supply (sops) mode. in the latter case, it operates at a constant frequency, which can be adjusted with external components r rc and c rc . furthermore, a primary stroke is started only in a valley of the secondary ringing. this can use constant power or constant current mode to drive leds. the valley switching principle mini mizes capacitive switch-on losses. 8.1 start-up and undervoltage lockout initially, the ic is self-supplying from the rect ified mains voltage. the ic starts switching as soon as the voltage on pin v cc passes the v cc(startup) level. the supply is taken over by the auxiliary winding of the transformer as soon as v cc is high enough and the supply from the line is stopped for high efficiency operation. if the auxiliary supply is not sufficient, th e high-voltage supply also supplies the ic. as soon as the voltage on pin v cc drops below the v cc(stop) level, the ic stops switching and restarts from the rectified mains voltage. 8.2 oscillator the frequency of the oscillator is set by the external resistor and capacitor on pin rc. the external capacitor is charged rapidly to the v rc(max) level and, starting from a new primary stroke, it discharges to the v rc(min) level. because the discharge is exponential, the relative sensitivity of the duty factor to the re gulation voltage at low duty factor is almost equal to the sensitivity at high duty factors. th is results in a more constant gain over the duty factor range compared to systems with a linear sawtooth oscillator. stable operation table 3. pin description symbol pin (dip8) description v cc 1 supply voltage gnd 2 ground rc 3 frequency setting reg 4 regulation input aux 5 input for voltage from auxiliary winding for timing (demagnetization) source 6 source of internal mos switch n.c. 7 not connected drain 8 drain of internal mos switch; input for start-up current and valley sensing
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 5 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers at low duty factors is easily realized. for high efficiency, th e frequency is reduced as soon as the duty factor drops below its low power th reshold. this is accomplished by increasing the oscillator charge time. to ensure that the capacitor can be charged within the charge time, the value of the oscillator capacitor should be limited to approximately 1 nf. 8.3 duty factor control the duty factor is controlled by the internal regulation volt age and the oscillator signal on pin rc. the internal regulation voltage is equal to the external regulation voltage (minus 2.5 v) multiplied by the gain of the error amplifier (t ypically 20 db). 8.4 valley switching a new cycle is started when the pr imary switch is switched on (see figure 3 ). after a certain time (determined by the oscillator volta ge rc and the internal regulation level), the switch is turned off and the secondary stroke starts. the internal regulation level is determined by the voltage on pin reg. after the secondary stroke, the drain volt age shows an oscillation with a frequency approximately equal to the value given by equation 1 : (1) where: l p = primary self-inductance c p = parasitic capacitance on drain node as soon as the oscillator voltage becomes hi gh again and after the secondary stroke has ended, the circuit waits for a low drain voltage before starting a new primary stroke. figure 3 shows the drain voltage together with the valley signal, the signal indicating the secondary stroke and the rc voltage. the primary stroke starts some time before the actual valley at low ringing frequencies, and some time after the actual valley at high ringing frequencies. 1 2 l p c p () ----------------------------------------------
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 6 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers figure 4 shows a typical curve for a reflected output voltage n v o of 80 v. this voltage is the output voltage v o (see figure 5 ) transferred to the primary side of the transformer with the factor n (determined by the turns ratio of the transformer). figure 4 shows that the system switches at the minimum drain voltage for ringing frequencies of 480 khz, thus reducing the switch-on losses to a minimum. at 200 khz, the next primary stroke is started at 33 before the valley. the switch-on losses are still redu ced significantly. a: start of new cycle with valley switching. b: start of new cycle in a classical system. fig 3. signals for valley switching fig 4. typical phase of drain ringing at switch-on (at n v o =80v) mgt423 drain valley secondary ringing secondary stroke primary stroke secondary stroke rc oscillator regulation level a b 0 200 400 800 f (khz) phase (deg) 40 20 ? 20 ? 40 0 mgt424 600
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 7 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers 8.5 demagnetization the system operates in discontinuous cond uction mode all the time. as long as the secondary stroke has not ended , the oscillator will not star t a new primary stroke. during the first t sup(xfmr_ring) seconds, demagnetization reco gnition is suppressed. this suppression may be necessary in applications where the transformer has a large leakage inductance and at low output voltages. 8.6 minimum and maximum duty factor the minimum duty factor of the switched mo de power supply is 0 %. the maximum duty factor is set to 75 % (typical value at 100 khz oscillation frequency). 8.7 overcurrent protection (ocp) the cycle-by-cycle peak drain current limit circ uit uses the external source resistor r i to measure the current. the circuit is activa ted after the leading edge blanking time t leb . the protection circuit limits the source voltage to v source(max) and thus limits the primary peak current. 8.8 overtemperature protection (otp) an accurate temperature protection is provided in the device. when the junction temperature exceeds the thermal shutdown temp erature, the ic stops switching. during thermal protection, the ic current is lowered to the start-up current. the ic continues normal operation as soon as the overtemperature situation has disappeared. 8.9 overvoltage protection (ovp) overvoltage protection can be achieved in th e application by pullin g pin reg above its normal operation level. the current primary stroke is terminated immediately. no new primary stroke is started until the voltage on pin reg drops to its normal operation level. pin reg has an internal clamp. the current feed into this pin must be limited. 8.10 characteristics of co mplete led power supply 8.10.1 input the input voltage range comprises the universal ac mains from 80 v to 276 v. 8.10.2 accuracy the accuracy of the complete converter, f unctioning as a voltage source with primary sensing, is approximately 8 % (mainly dependent on the transformer coupling). the accuracy with secondary sensing is defined by the accuracy of the external components. for safety requirements in case of optocoupler feedback loss, the primary sensing remains active when an overvoltage circuit is connected. 8.10.3 efficiency an efficiency over 80 % at maximum output power can be achieved for a complete converter designed for universal mains.
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 8 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers 8.10.4 ripple a minimum ripple is obtained in a system designed for a maximum duty factor of 50 % under normal operating conditions and a minimized dead time. the magnitude of the ripple in the output voltage is determined by the frequency and duty factor of the converter, the output current level, and the value and equivalent series resistance ( esr) of the output capacitor. 8.10.5 output the ssl1523a can operate over a wide rang e of output power levels up to 15 w.
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 9 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers 9. limiting values [1] human body model: equivalent to discharging a 100 pf capacitor through a 1.5 k series resistor. all pins are 2500 v maximum, except pin drain, which is 1000 v maximum. [2] machine model: equivalent to dischar ging a 200 pf capacitor through a 0.75 h coil and a 10 series resistor. 10. thermal characteristics [1] thermal resistance r th(j-a) can be lower when the gnd pins are connec ted to sufficient copper area on the printed-circuit board. see the ss l152x application notes for details. table 4. limiting values in accordance with the absolute maximum rating system (iec 60134). all voltages are measured with respect to ground; positive currents flow into the device; pins v cc and rc are not allowed to be current driven and pins reg and aux are not allowed to be voltage driven. symbol parameter conditions min max unit voltage v cc supply voltage continuous ? 0.4 +40 v v rc voltage on pin rc oscillator input voltage ? 0.4 +3 v v source voltage on pin source dmos power transistor ? 0.4 +5 v v drain voltage on pin drain dmos power transistor; t j >0 c ? 0.4 +650 v current i reg current on pin reg - 6 ma i aux current on pin aux ? 10 +5 ma i source source current ? 2+2a i drain current on pin drain ? 2+2a general p tot total power dissipation t amb <45 c-1 . 0w t stg storage temperature ? 55 +150 c t j junction temperature ? 40 +145 c v esd electrostatic discharge voltage human body model [1] - 2500 v machine model [2] - 200 v table 5. thermal characteristics symbol parameter conditions typ unit r th(j-a) thermal resistance from junction to ambient in free air [1] 100 k/w
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 10 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers 11. characteristics table 6. characteristics measurement data valid at t amb =25 c; no overtemperature; all voltages are measured with respect to ground; currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit supply i cc(oper) operating supply current normal operation - 1.3 1.9 ma i cc(startup) start-up supply current start-up - 180 400 a i cc supply current v drain >60v ? 6 ? 4 ? 3ma v cc(startup) start-up supply voltage 9 9.5 10 v v cc(stop) stop supply voltage undervoltage lockout 7.0 7.5 8.0 v i drain current on pin drain v drain >60v no auxiliary supply - 1.5 2 ma with auxiliary supply - 30 125 a pulse-width modulator min minimum duty factor - 0 - % max maximum duty cycle f = 100 khz - 75 - % sops v det(demag) demagnetization detection voltage 50 100 150 mv t sup(xfmr_ring) transformer ringing suppression time 1.0 1.5 2.0 s rc oscillator v rc(min) minimum voltage on pin rc 60 75 90 mv v rc(max) maximum voltage on pin rc 2.4 2.5 2.6 v t ch charge time - 1 - s f osc oscillator frequency 10 100 200 khz duty factor regulator: pin reg v reg voltage on pin reg 2.4 2.5 2.6 v g v voltage gain - 20 - db v clamp(reg) clamp voltage on pin reg i reg =6ma - - 7.5 v valley switching ( v/ t) vrec valley recognition voltage change with time ? 102 - +102 v/ s f ring ringing frequency n v o = 100 v 200 550 800 khz t d(vrec-swon) valley recognition to switch-on delay time -150-ns current protection v source(max) maximum voltage on pin source v/ t=0.1v/ s 0.47 0.50 0.53 v t d delay time v/ t=0.5v/ s - 160 185 ns t leb leading edge blanking time 250 350 450 ns fet output stage i l(drain) leakage current on pin drain v drain = 650 v - - 125 a v br(drain) breakdown voltage on pin drain t j >0 c6 5 0 - - v
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 11 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers r dson drain-source on-state resistance i source = ? 0.50 a t j =25 c- 6 . 5 7 . 5 t j =100 c - 9.0 10.0 t f(drain) fall time on pin drain v i = 300 v; no external capacitor at drain -75-ns temperature protection t prot protection temperature 150 160 170 c t prot(hys) hysteresis of protection temperature -2- c table 6. characteristics ?continued measurement data valid at t amb =25 c; no overtemperature; all voltages are measured with respect to ground; currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 12 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers 12. application information fig 5. typical configuration of ssl1523a - primary sensing aaa-002490 1 2 3 4 8 7 6 5 SSL1523AP n.c. r4 r3 r2 r1 d2 c6 - ycap d1 d5 z1 c5 cf2 lf cf1 mains r aux r i r rc c rc c vcc
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 13 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers 13. package outline fig 6. package outline sot97-1 (dip8) references outline version european projection issue date iec jedec jeita sot97-1 99-12-27 03-02-13 unit a max. 12 b 1 (1) (1) (1) b 2 cd e e m z h l mm dimensions (inch dimensions are derived from the original mm dimensions) a min. a max. b max. w m e e 1 1.73 1.14 0.53 0.38 0.36 0.23 9.8 9.2 6.48 6.20 3.60 3.05 0.254 2.54 7.62 8.25 7.80 10.0 8.3 1.15 4.2 0.51 3.2 inches 0.068 0.045 0.021 0.015 0.014 0.009 1.07 0.89 0.042 0.035 0.39 0.36 0.26 0.24 0.14 0.12 0.01 0.1 0.3 0.32 0.31 0.39 0.33 0.045 0.17 0.02 0.13 b 2 050g01 mo-001 sc-504-8 m h c (e ) 1 m e a l seating plane a 1 w m b 1 e d a 2 z 8 1 5 4 b e 0 5 10 mm scale note 1. plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included. pin 1 index dip8: plastic dual in-line package; 8 leads (300 mil) sot97-1
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 14 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers 14. abbreviations 15. revision history table 7. abbreviations acronym description bicmos bipolar complementary metal oxide semiconductor dmos diffusion metal oxide semiconductor esr equivalent series resistance ez-hv soi easy high voltage silicon-on-insulator fet field-effect transistor smps switched mode power supply sops self-oscillating power supply table 8. revision history document id release date data sheet status change notice supersedes ssl1523a v.1 20120425 product data sheet - -
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 15 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers 16. legal information 16.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term ?short data sheet? is explained in section ?definitions?. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 16.2 definitions draft ? the document is a draft versi on only. the content is still under internal review and subject to formal approval, which may result in modifications or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. short data sheet ? a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request vi a the local nxp semiconductors sales office. in case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. product specification ? the information and data provided in a product data sheet shall define the specification of the product as agreed between nxp semiconductors and its customer , unless nxp semiconductors and customer have explicitly agreed otherwis e in writing. in no event however, shall an agreement be valid in which the nxp semiconductors product is deemed to offer functions and qualities beyond those described in the product data sheet. 16.3 disclaimers limited warranty and liability ? information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such info rmation. nxp semiconductors takes no responsibility for the content in this document if provided by an information source outside of nxp semiconductors. in no event shall nxp semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. notwithstanding any damages that customer might incur for any reason whatsoever, nxp semiconductors? aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the terms and conditions of commercial sale of nxp semiconductors. right to make changes ? nxp semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use ? nxp semiconductors products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors and its suppliers accept no liability for inclusion and/or use of nxp semiconducto rs products in such equipment or applications and therefore such inclusion and/or use is at the customer?s own risk. applications ? applications that are described herein for any of these products are for illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. customers are responsible for the design and operation of their applications and products using nxp semiconductors products, and nxp semiconductors accepts no liability for any assistance with applications or customer product design. it is customer?s sole responsibility to determine whether the nxp semiconductors product is suitable and fit for the customer?s applications and products planned, as well as fo r the planned application and use of customer?s third party customer(s). customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. nxp semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer?s applications or products, or the application or use by customer?s third party customer(s). customer is responsible for doing all necessary testing for the customer?s applic ations and products using nxp semiconductors products in order to av oid a default of the applications and the products or of the application or use by customer?s third party customer(s). nxp does not accept any liability in this respect. limiting values ? stress above one or more limiting values (as defined in the absolute maximum ratings system of iec 60134) will cause permanent damage to the device. limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the recommended operating conditions section (if present) or the characteristics sections of this document is not warranted. constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. terms and conditions of commercial sale ? nxp semiconductors products are sold subject to the gener al terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , unless otherwise agreed in a valid written individual agreement. in case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. nxp semiconductors hereby expressly objects to applying the customer?s general terms and conditions with regard to the purchase of nxp semiconducto rs products by customer. no offer to sell or license ? nothing in this document may be interpreted or construed as an offer to sell products t hat is open for acceptance or the grant, conveyance or implication of any lic ense under any copyrights, patents or other industrial or intellectual property rights. document status [1] [2] product status [3] definition objective [short] data sheet development this document contains data from the objecti ve specification for product development. preliminary [short] data sheet qualification this document contains data from the preliminary specification. product [short] data sheet production this document contains the product specification.
ssl1523a all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 1 ? 25 april 2012 16 of 17 nxp semiconductors ssl1523a smps ics for mains led drivers quick reference data ? the quick reference data is an extract of the product data given in the limiting values and characteristics sections of this document, and as such is not comple te, exhaustive or legally binding. export control ? this document as well as the item(s) described herein may be subject to export control regu lations. export might require a prior authorization from competent authorities. non-automotive qualified products ? unless this data sheet expressly states that this specific nxp semicon ductors product is automotive qualified, the product is not suitable for automotive use. it is neither qualified nor tested in accordance with automotive testing or application requirements. nxp semiconductors accepts no liabili ty for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. in the event that customer uses t he product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without nxp semiconductors? warranty of the product for such automotive applicat ions, use and specifications, and (b) whenever customer uses the product for automotive applications beyond nxp semiconductors? specifications such use shall be solely at customer?s own risk, and (c) customer fully indemnifies nxp semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive app lications beyond nxp semiconductors? standard warranty and nxp semiconduct ors? product specifications. 16.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. 17. contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com
nxp semiconductors ssl1523a smps ics for mains led drivers ? nxp b.v. 2012. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 25 april 2012 document identifier: ssl1523a please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 18. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features and benefits . . . . . . . . . . . . . . . . . . . . 1 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 quick reference data . . . . . . . . . . . . . . . . . . . . . 2 5 ordering information . . . . . . . . . . . . . . . . . . . . . 2 6 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 7 pinning information . . . . . . . . . . . . . . . . . . . . . . 3 7.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 7.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4 8 functional description . . . . . . . . . . . . . . . . . . . 4 8.1 start-up and undervoltage lockout . . . . . . . . . . 4 8.2 oscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 8.3 duty factor control . . . . . . . . . . . . . . . . . . . . . . 5 8.4 valley switching . . . . . . . . . . . . . . . . . . . . . . . . 5 8.5 demagnetization. . . . . . . . . . . . . . . . . . . . . . . . 7 8.6 minimum and maximum duty factor . . . . . . . . . 7 8.7 overcurrent protection (ocp) . . . . . . . . . . . . . 7 8.8 overtemperature protection (otp) . . . . . . . . . 7 8.9 overvoltage protection (ovp) . . . . . . . . . . . . . 7 8.10 characteristics of complete led power supply 7 8.10.1 input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 8.10.2 accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 8.10.3 efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 8.10.4 ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8.10.5 output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 9 limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 9 10 thermal characteristics . . . . . . . . . . . . . . . . . . 9 11 characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 10 12 application information. . . . . . . . . . . . . . . . . . 12 13 package outline . . . . . . . . . . . . . . . . . . . . . . . . 13 14 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 14 15 revision history . . . . . . . . . . . . . . . . . . . . . . . . 14 16 legal information. . . . . . . . . . . . . . . . . . . . . . . 15 16.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 15 16.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 16.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 16.4 trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 16 17 contact information. . . . . . . . . . . . . . . . . . . . . 16 18 contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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