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1. general description the SSL5021BTS is a highly integrated, high -precision, non-isolated mosfet/bipolar buck controller. it is intended to drive le d lamps in universal ma ins non-dimmable lighting applications up to 25 w. the SSL5021BTS is designed for low-ripple applications. the SSL5021BTS operates in boundary con duction mode (bcm) with on-time regulation. operating in bcm provides a constant output current control with high accuracy. adaptive switching frequency gives freedom to choose the inductor, which enables the optimization of inductor size, efficiency and emi. the SSL5021BTS starts up and operates in switching mode directly from an external resistor without dv/dt supply or auxiliary supply. this feature simplifies the v cc supply. it allows a low-cost off- the-shelf inductor to be used, pr oviding flexibility in application design. the SSL5021BTS comes in a compact tsop6 package. the ssl5031bts is suitable for high power factor/low thd applications with a high-temperature foldback function. the ssl5031cts is best for high power factor/low thd applications without a high-temperature foldback function. 2. features and benefits ? driving led strings from a rectifie d mains supply, low-ripple (< 5 %) ? small electronic bill of materials (bom) enabling a compact solu tion and a small, single layer printed-circu it board (pcb) footprint ? excellent line and load regulation and led output current accuracy ? efficient bcm operation with: ? no reverse recovery loss es in freewheel diode ? zero current switching (zcs) and va lley switching for switch turn-on ? minimal inductance value and size required ? high efficiency (up to 93 %) ? ultra low ic current during operation (< 150 ? a) ? many auto-recovery protections: ? undervoltage lockout (uvlo) ? cycle-by-cycle overcurrent protection (ocp) ? internal overtemperature protection (otp) ? output overvoltage protection (ovp) ? output short protection (osp) SSL5021BTS compact low-ripple buck led driver ic rev. 1 ? 15 october 2014 preliminary data sheet
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 2 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic ? thermal foldback protection via a single ptc or ntc resistor ? compatible with wall switch es with built-in standby indicator lights (hotaru switch) ? ic lifetime meets and exceeds t he required led lamp lifetime 3. applications ? the SSL5021BTS is intended for low-cost, non-isolated led lighting applications with accurate fixed current output up to 25 w for single mains or universal mains voltage (90 v (ac) to 277 v (ac)). 4. quick reference data [1] an internal clamp sets the supply voltage. the curre nt into the vcc pin must not exceed the maximum i vcc value (see table 4 ). 5. ordering information table 1. quick reference data symbol parameter conditions min typ max unit v cc supply voltage operating range [1] 9.5 - 16 v r dson on-state resistance of internal switch t j =25 ? c-0 . 7 5- ? t j =125 ? c-1.20- ? i i(sw) input current in pin sw duty cycle < 5 % ? 2- +2a v i(sw) input voltage on pin sw current limited at 8.8 ma; internal switch off ? 0.4 - +22 v table 2. ordering information type number package name description version SSL5021BTS tsop6 plastic surface-mounted package; 6 leads sot457
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 3 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic 6. block diagram 7. pinning information 7.1 pinning fig 1. block diagram ddd 9&& 6: ,616 *1' '(0293 &203 217,0( 5(*8/$725 9$//(< '(7(&7,21 /2*,& &21752/ $1' 3527(&7,21 6833/< %$1'*$3 5(*8/$725 325 $1$/2* &219(57(5 7(03)2/' '(0$* p9 9 2&3 9 293 %/$1. fig 2. SSL5021BTS pin configuration (tsop6) 66/%76 66/%76 66/%76 ,616 &203 9&& *1' 6: '(0293 ddd
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 4 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic 7.2 pin description 8. functional description 8.1 converter operation the SSL5021BTS is a power mosfet and bipolar compatible controller. the converter in the SSL5021BTS is a source/emitter switch, boundary conduction mode (bcm), on-time controlled system. figure 3 shows the application diagram for mosfet. figure 4 shows the application diagram for bipolar. the integrated switch is used to save ic supply current. it enables the use a single external resistor as supply even in switching mode. this converter operates at the boundary between continuous conduction mo de (ccm) and discontinuous conduction mode (dcm). figure 5 shows the waveforms. when the internal switch is switc hed on at t0, the inductor current i l builds up from zero in proportional with v in -v out during the switch on-time (t0 to t1). energy is stored in the inductor. when the internal switch switches off at t1, i l drops proportionally to the value of v out . the current flows through the freewheeling diode and the output capacitor (t2 to t3). when i l reaches zero, after a short delay (t3 to t00), a new switching cycle starts. table 3. pin description symbol pin description isns 1 current sense input vcc 2 supply voltage sw 3 internal switch drain demovp 4 input from led output for demag netization timing, valley detection, temperature foldback, and ovp gnd 5 ground comp 6 loop compensation to provide a stable response
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 5 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic (1) r3b, r6b, c1 and c2 are the parts for the 230 v (ac) mains application. short r3b and r6b out; reduce c1 and c2 voltage rating for the 120 v (ac) mains application. (2) rt1 is optional, it is normally shorted. fig 3. SSL5021BTS application diagram for mosfet 9pdlqv 9pdlqv )6 57 w? & 9 & 9 ' / & 9 8 5 5d 5e 5 5 5e 5d 5 & & 9 /('v /('3 5 / '(0293 *1' &203 6: ,& 9&& ,616 4 ' ddd
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 6 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic 8.2 on-time control when measuring the inductor current i l using sense resistor r4, the on-time is regulated so that the average regulation voltage on pin isns (v reg(av)isns ) equals an internal reference voltage (0.4 v). i l can be calculated with equation 1 : (1) where: ? 0.06 = bond wire resistance of isns pin. 8.3 valley detection after i l has decreased to zero at t3, the ledp voltage st arts to oscillate around the bus voltage (v in ) minus output voltage level (v out ), with amplitude output voltage (v out ) and frequency (f ring ). valley detection is a special circuit that is integrated in the SSL5021BTS. (1) r3b, r6b, c1 and c2 are the parts for the 230 v (ac) mains application. short r3b and r6b out; reduce c1 and c2 voltage rating for the 120 v (ac) mains application. (2) rt1 is optional, it is normally shorted. fig 4. SSL5021BTS application diagram for bipolar 9pdlqv 9pdlqv ) 57 w? & 9 & 9 ' / & 9 8 5 5d 5e 5 5e 5d 5 & & 9 /('v /('3 5 5 / '(0293 *1' &203 6: ,& 9&& ,616 4 4 ' ddd i l 0.4 vr40.06 + ?? ? =
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 7 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic it senses when the ledp voltage reaches it s lowest level (valle y) through demovp pin connection. if a valley is detected, the internal s witch is switched on again. as a result, the switch-on switching losses are reduced. 8.4 start-up current the supply current for the ic is supplied by resistor r3a and r3b. the ic drawns an additional start-up current (i cc(startup) ) just before v cc reaches the start-up voltage level (v startup ). so the supply current in operating mode is lower than during start-up conditions, preventing lamp flicker when the mains vo ltage is increased or decreased slowly. figure 6 shows the basic behavior. fig 5. buck waveforms and valley detection ddd 9 287 9 ,1 w w w w w pdjqhwl]dwlrq ghpdjqhwl]dwlrq lqwhuqdo vzlwfk jdwh 9 *$7( 9 /('3 , / 9dooh\ 7
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 8 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic 8.5 leading-edge blanking (leb) to prevent false detection of overcurren t, a blanking time following switch-on is implemented. when the internal switch turn s on, a short current spike can occur because of the discharge capacitance of the mo sfet/bipolar (q1) drain/collector node. 8.6 protections the ic incorporates th e following protections: ? undervoltage lockout (uvlo) ? cycle-by-cycle overcurrent protection (ocp) ? internal overtemperature protection (otp) ? cycle-by-cycle maximum on-time protection ? output overvoltage protection ? output short protection (osp) 8.6.1 undervoltage lockout (uvlo) when voltage on vcc pin drops to below v th(uvlo) , the ic stops switching. an attempt is made to restart ic when the voltage on the vcc pin > v startup . 8.6.2 cycle-by-cycle overcurrent protection (ocp) the SSL5021BTS incorporates a built-in peak current detector. it triggers when the voltage at the isns pin reaches the peak level v i(isns)max . a resistor connected to isns pin senses the current through inductor i l . the maximum current in inductor i l , i l(max) equals: (2) fig 6. start-up current waveform ddd 9 && 9 * $7( , && , &&vwduwxs , &&rshu 9 ghowd9&& 9 vwduwxs i lmax ?? v iisns ?? max r4 0.06 + --------------------------- =
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 9 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic the sense circuit is activated after the leading-edge blanking time (t leb ). because the led current is half the peak current by design , the sense circuit automatically provides protection for the maximum led current durin g operation. a propagation delay exists between the overcurrent detection and the actual switch switch-off. due to this delay, the actual peak current is slightly higher than th e ocp level set by the resistor connected in series with the isns pin. 8.6.3 overtemperature protection (otp) the converter stops switching when the intern al otp function is triggered at the ic temperature t pl(ic) . the safe-restart protection is triggered and the ic resumes switching when the ic temperature drops to below t rst(ic) . 8.6.4 cycle-by-cycle maximum on-time protection measuring the inductor current i l using sense resistor r4 regulates the on-time. the on-time is limited to a fixed value (t on(max) ). it protects the system and the ic when the isns pin is shorted or when the system works at very low mains voltage. 8.6.5 output overvoltage protection (ovp) an accurate output ovp is implemented by measuring the voltage at the demovp pin during the secondary stroke. the resistive divider connected between the ledp node and the demovp pin sets the maximum led voltage. an internal counter prevents false ovp detec tion because of noise on the demovp pin. after three continuous cycles with a demovp pin voltage above the ovp level, the ovp protection is triggered. the over voltage protection triggers a restart sequence: a discharge current (i cc(dch) ) is enabled and discharges the voltage on the vcc pin to below v rst(latch) . when v rst(latch) is reached, the system restarts. 8.6.6 output short protection (osp) the converter operates in dis continuous conduction mode (dcm). a new cycle is only started after the previous cycle has ended. the end of the cycl e is detected by measuring the voltage on the demovp pin. when the demovp pin voltage drops to below the demagnetization level (v th(comp)demovp ) and a valley is detected, a new cycle starts. when output is shorted, the demagnetiz ation is not finalized within the 40 ? s. the converter still regulates the adjusted output cu rrent and the on-time is reduced to a safe value by this feedback. the reduced on-time in combination with very long demagnetization time prevents that the conv erter is damaged or excessive dissipation occurs. a blanking time (t sup(xfmr_ring) ) is implemented at the start of the secondary stroke to prevent false demagnetization detection. 8.7 supply management the ic starts up when the voltage on the vcc pin increases to exceed v startup . the ic locks out (stops switching) when the voltage on the vcc pin drops to below v th(uvlo) . the hysteresis between the start and stop levels allows the vcc capacitor to supply the ic during zero-crossings of the mains.
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 10 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic the SSL5021BTS incorporates an internal clam ping circuit to limit the voltage on the vcc pin. the clamp limits the voltage on the vcc pin to the maximum value, v clamp(vcc) . if the maximum current of the external resistor minus the current consumption of the ic is lower than the limiting value of i vcc in ta b l e 4 , no external zener diode is required. 8.8 ptc or ntc function a nd high-temperature foldback the ptc function or ntc function can be used as a control method for led thermal protection. the ptc resistor which is connec ted to demovp pin senses the temperature. when the voltage on demovp pin is higher than the foldback level (v fold(demovp) ), the on-time is reduced with the increased demovp pin voltage. then the average led current is reduced. when the temperature keeps increasing, the v th(ovp) is exceeded. the converter stops switching. the ic restarts when ovp is triggered. this feature is optional as shown in figure 3 and figure 4 . ptc is normally shorted. 9. limiting values table 4. limiting values in accordance with the absolute maximum rating system (iec 60134). symbol parameter conditions min max unit voltages v cc supply voltage current limited [1] [2] ? 0.4 +18 v v i(sw) input voltage on pin sw current limited to 8.8 ma; internal switch off [2] ? 0.4 +22 v v i(isns) input voltage on pin isns ? 0.4 +5 v v i(comp) input voltage on pin comp ? 0.4 +5.3 v v i(demovp) input voltage on pin demovp ? 5+5v currents i i(vcc) input current on pin vcc - 8.8 ma i i(sw) input current on pin sw rms current - 380 ma duty cycle < 5 % ? 2+2a i i(isns) input current on pin isns duty cycle < 5 % ? 2+2a general p tot total power dissipation t amb <75 ?c - 0.28 w t stg storage temperature ? 55 +150 ?c t j junction temperature ? 40 +160 ?c
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 11 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic [1] the current into the vcc pin must not exceed the maximum i (vcc) value. [2] an internal clamp sets the supply voltage and current limits. [3] equivalent to discharge a 100 pf capacitor through a 1.5 k ? series resistor. [4] charged device model: equivalent to charging the ic up to 1 kv and the subsequent discharging of each pin down to 0 v over a 1 ? resistor. 10. thermal characteristics 11. characteristics esd esd electrostatic discharge class 1 human body model [3] ? 2000 +2000 v charged device model [4] ? 500 +500 v table 4. limiting values ?continued in accordance with the absolute maximum rating system (iec 60134). symbol parameter conditions min max unit table 5. thermal characteristics symbol parameter conditions typ unit r th(j-a) thermal resistance from junction to ambient in free air; jedec test board 259 k/w r th(j-c) thermal resistance from junction to case in free air; jedec test board 152 k/w table 6. characteristics t amb =25 ? c; v cc = 15 v; all voltages are measured with respect to ground pin (pin 5); currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit supply (pin vcc) v startup start-up voltage - 12.6 - v v th(uvlo) undervoltage lockout threshold voltage -9.9- v v delta(vcc) delta voltage on pin vcc - 0.30 - v v clamp(vcc) clamp voltage on pin vcc i i(vcc) =2.6ma - 15.8 - v v rst(latch) latched reset voltage - 6.2 - v i cc(oper) operating supply current switching at 100 khz - - 150 ? a i cc(startup) start-up supply current - 88 - ? a i cc(dch) discharge supply current v cc =v rst(latch) 2.2 - - ma loop compensation (pin comp) v ton(comp)zero zero on-time voltage on pin comp -2.0- v v ton(comp)max maximum on-time voltage on pin comp -4.0- v v clamp(comp) clamp voltage on pin comp - 4.7 - v
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 12 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic [1] guaranteed by design. t on(max) maximum on-time v i(comp) =4v - 15.4 - ? s i o(comp) output current on pin comp v i(isns) =0v - 3.9 - ? a valley detection and overvoltage detection (pin demovp) v th(ovp) overvoltage protection threshold voltage -1.82- v n cy(ovp) number of overvoltage protection cycles -3- - v fold(demovp) foldback voltage on pin demovp -1.64- v gm demovp transconductance on pin demovp v i(demovp) to i i(comp) -28.5- ? a/v v th(comp)demovp comparator threshold voltage on pin demovp -18- mv (dv/dt) vrec valley recognition voltage change with time [1] --3.8- v/ ? s t sup(xmfr_ring) transformer ringing suppression time -1.5- ? s current sensing (pin isns) v i(isns)max maximum input voltage on pin isns -1.0- v t leb leading edge blanking time - 420 - ns gm isns transconductance on pin isns v i(isns) to i i(comp) -9.5- ? a/v v reg(av)isns average regulation voltage on pin isns -0.41- v driver (pin sw) r dson on-state resistance t j =25 ?c - 0.75 - ? t j =125 ?c - 1.20 - ? t off(max) maximum turn-off time - 40.7 - ? s temperature protection t pl(ic) ic protection level temperature - 150 - ?c t rst(ic) ic reset level temperature - 120 - ?c table 6. characteristics ?continued t amb =25 ? c; v cc = 15 v; all voltages are measured with respect to ground pin (pin 5); currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 13 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic 12. package outline fig 7. package outline sot457 (tsop6) 5()(5(1&(6 287/,1( 9(56,21 (8523($1 352-(&7,21 ,668('$7( ,(& -('(& -(,7$ 627 6& z% 0 e s ' h slq lqgh[ $ $ / s 4 ghwdlo; + ( ( y 0 $ $ % \ vfdoh f ; p p 3odvwlfvxuidfhprxqwhgsdfndjh7623ohdgv 627 81,7 $ e s f' ( + ( / s 4\ zy pp h ',0(16,216ppduhwkhruljlqdoglphqvlrqv $
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 14 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic 13. abbreviations table 7. abbreviations acronym description bcm boundary conduction mode bom bill of materials leb leading-edge blanking ocp overcurrent protection osp output short protection otp overtemperature protection ovp overvoltage protection pcb printed-circuit board uvlo undervoltage lockout zcs zero current switching
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 15 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic 14. revision history table 8. revision history document id release date data sheet status change notice supersedes SSL5021BTS v.1 20141015 preliminary data sheet - -
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 16 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic 15. legal information 15.1 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 . 15.2 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 ? 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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.
SSL5021BTS all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights reserved. preliminary data sheet rev. 1 ? 15 october 2014 17 of 18 nxp semiconductors SSL5021BTS compact low-ripple buck led driver ic 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. 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. 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. translations ? a non-english (translated) version of a document is for reference only. the english version shall prevail in case of any discrepancy between the translated and english versions. 15.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. greenchip ? is a trademark of nxp semiconductors n.v. 16. 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 SSL5021BTS compact low-ripple buck led driver ic ? nxp semiconductors n.v. 2014. 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: 15 october 2014 document identifier: SSL5021BTS please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 17. 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 converter operation . . . . . . . . . . . . . . . . . . . . . 4 8.2 on-time control . . . . . . . . . . . . . . . . . . . . . . . . . 6 8.3 valley detection. . . . . . . . . . . . . . . . . . . . . . . . . 6 8.4 start-up current . . . . . . . . . . . . . . . . . . . . . . . . . 7 8.5 leading-edge blanking (leb) . . . . . . . . . . . . . 8 8.6 protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8.6.1 undervoltage lockout (uvlo) . . . . . . . . . . . . 8 8.6.2 cycle-by-cycle overcurr ent protection (ocp) . 8 8.6.3 overtemperature protection (otp) . . . . . . . . . 9 8.6.4 cycle-by-cycle maximum on-time protection . . 9 8.6.5 output overvolt age protection (ovp) . . . . . . . 9 8.6.6 output short protection (osp) . . . . . . . . . . . . . 9 8.7 supply management. . . . . . . . . . . . . . . . . . . . . 9 8.8 ptc or ntc function and high-temperature foldback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 9 limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 10 10 thermal characteristics . . . . . . . . . . . . . . . . . 11 11 characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 11 12 package outline . . . . . . . . . . . . . . . . . . . . . . . . 13 13 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 14 14 revision history . . . . . . . . . . . . . . . . . . . . . . . . 15 15 legal information. . . . . . . . . . . . . . . . . . . . . . . 16 15.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 16 15.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 15.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 15.4 trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 17 16 contact information. . . . . . . . . . . . . . . . . . . . . 17 17 contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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