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lc5540ld series description lc5540ld series is a quasi-resonant topology switching power supply ic, designed for input capacitorless applica- tions, and making it possible for systems to comply with the harmonics standard (iec61000-3-2 class c). it incorporates separate controller and power mosfet chips. the control- ler adapts the average current control method for realizing high power factors, and the quasi-resonant topology contrib- utes to high efficiency and low emi noise. the rich set of protection features helps to realize low component counts, and high performance-to-cost power supply. the lc5540ld devices are intended for isolated designs. the incorporated mosfet has a v dss (min) rating from 650 v (lc5545ld and LC5546LD) to 800 v (lc5548ld). the r ds(on) (max) is 1.9 (LC5546LD) to 3.95 (lc5545ld). it is capable of a maximum output power of 20 w on 230 vac supply to 16 w on universal supply (LC5546LD) based on the thermal rating. note that the maximum output power can be up to 120% to 140% of this value. however, it may be limited in applications with low output voltage or short duty cycle. features and benefits ? integrated on-width control circuit (it realizes high power factor by average current control) ? integrated startup circuit (no external startup circuit necessary) ? integrated soft-start circuit (reduces power stress during start-up on the incorporated power mosfet and rectifier) ? integrated bias assist circuit (improves the startup performance, suppresses v cc voltage droop during operation, allows reduction of vcc capacitor value as well as use of a ceramic capacitor) ? integrated leading edge blanking (leb) circuit ? integrated maximum on-time limit circuit ? dual-chip structure, with an avalanche-guaranteed power mosfet (allows simplified surge suppressing circuits) ? protection features: ? overcurrent protection (ocp): pulse-by-pulse ? overvoltage protection (ovp): latched shutdown ? overload protection (olp): latched shutdown ? thermal shutdown (tsd): latched shutdown single-stage power factor corrected off-line switching regulators typical application package: 8-pin dip not to scale c2 c6 c5 d8 + - pc1 u2 dz1 d1 d3 d2 d4 f1 l1 c1 q1 d5 c4 c3 t1 d6 d7 dz2 pc2 l2 led r1 pc2 d9 r8 r9 r10 r11 r12 r13 r14 r15 r16 r17 r18 r19 r20 ( rocp) r2 r3 r4 r5 r6 vac pc1 r7 c7 c8 c10 c9 c11 c12 c13 c14 c15 c16 c17 5 1 2 3 d/st 8 s/gnd vcc control part u1 ovp ocp fb nf s/gnd lc554xld 6 4 applications ? led lighting fixtures ? led light bulbs lc5540ld-ds sanken electric co., ltd.
selection guide part number mosfet v dss (min) (v) r ds(on) (max) ( ) pwm operation frequency, f osc (typ) (khz) on-time t on(max) (typ) ( s) p out * (w) 230 vac universal lc5545ld 650 3.95 72 9.3 13 10 LC5546LD 1.9 60 11.2 20 16 lc5548ld 800 3.5 72 9.3 13 10 *based on the thermal rating; the allowable maximum output power can be up to 120% to 140% of this value. however, maximum output power may be limited in such an application with low output voltage or short duty cycle. absolute maximum ratings unless specifically noted, t a is 25c characteristic symbol notes pins rating unit drain current 1 i dpeak lc5545ld single pulse 8 ? 1 2.5 a LC5546LD 4.0 a lc5548ld 2.6 a single pulse avalanche energy 2 e as lc5545ld i lpeak = 2.0 a, v dd = 99 v, l = 10 mh 8 ? 1 47 mj LC5546LD i lpeak = 2.7 a, v dd = 99 v, l = 10 mh 86 mj lc5548ld i lpeak = 2.3 a, v dd = 99 v, l = 10 mh 56 mj input voltage for control part (mic) v cc 2 ? 1 35 v ocp pin voltage v ocp 3 ? 1 ? 1.0 to 5.0 v fb pin voltage v fb 4 ? 1 ? 0.3 to 7.0 v ovp pin voltage v ovp 6 ? 1 ? 0.3 to 5.0 v allowable power dissipation of mosfet 3 p d1 mounted on a 15 mm 15 mm pcb 8 ? 1 0.97 w operating ambient temperature t op D? 55 to 125 c storage temperature t stg D? 55 to 125 c channel temperature t ch D 150 c 1 refer to mosfet safe operating area curve. 2 refer to mosfet avalanche energy derating coefficient curve. 3 refer to mosfet temperature versus power dissipation curve. the polarity value for current specifies a sink as "+," and a source as ? ? ,? referencing the ic. 2 sanken electric co., ltd. lc5540ld-ds single-stage power factor corrected off-line switching regulators lc5540ld series
electrical characteristics of control part (mic) t a = 25c, v cc = 20 v, unless otherwise specified characteristic symbol test conditions pins min. typ. max. unit power supply startup operation operation start voltage v cc(on) 2 ? 1 13.8 15.1 17.3 v operation stop voltage* v cc(off) 2 ? 1 8.4 9.4 10.7 v circuit current in operation i cc(on) 2 ? 1 ? ? 4.7 ma startup circuit operation voltage v startup 8 ? 1 18 21 24 v startup current i cc(startup) v cc = 13 v 2 ? 1 ? 8.5 ? 4.0 ? 1.5 ma startup current threshold biasing voltage* v cc(bias) 2 ? 1 9.5 11.0 12.5 v normal operation pwm operation frequency f osc lc5545ld 8 ? 1 60 72 84 khz LC5546LD 50 60 70 khz lc5548ld 60 72 84 khz maximum on-time t on(max) lc5545ld 8 ? 1 8.0 9.3 11.2 s LC5546LD 9.0 11.2 13.4 s lc5548ld 8.0 9.3 11.2 s fb pin control minimum voltage v fb(min) 4 ? 1 0.50 0.85 1.20 v maximum feedback current i fb(max) 4 ? 1 ?40 ?25 ?10 a leading edge blanking time t on(leb) 3 ? 1 ? 600 ? ns quasi-resonant operation threshold voltage-1 v bd(th1) 3 ? 1 0.14 0.24 0.34 v quasi-resonant operation threshold voltage-2 v bd(th2) 3 ? 1 0.11 0.16 0.21 v protected operation ocp pin overcurrent protection (ocp) threshold voltage v ocp 3 ? 1 ? 0.66 ? 0.60 ? 0.54 v ocp pin source current i ocp 3 ? 1 ? 120 ? 40 ? 10 a ocp pin overvoltage protection (ovp) operation voltage v bd(ovp) 3 ? 1 2.2 2.6 3.0 v overload protection (olp) threshold voltage v fb(olp) 4 ? 1 4.1 4.5 4.9 v ovp pin ovp threshold voltage v ovp(ovp) 6 ? 1 1.6 2.0 2.4 v vcc pin ovp threshold voltage v cc(ovp) 2 ? 1 28.5 31.5 34.0 v thermal shutdown activating temperature t j(tsd) ? 135 ? ? c *v cc(bias) > v cc(off) always. 3 sanken electric co., ltd. lc5540ld-ds single-stage power factor corrected off-line switching regulators lc5540ld series
electrical characteristics (mosfet) t a = 25c, unless otherwise specified characteristic symbol test conditions pins min. typ. max. unit drain-to-source breakdown voltage v dss lc5545ld 8 ? 1 650 DD v LC5546LD 650 DD v lc5548ld 800 DD v drain leakage current i dss 8 ? 1 DD 300 a on-resistance r ds(on) lc5545ld 8 ? 1 DD 3.95 LC5546LD DD 1.9 lc5548ld DD 3.5 switching time t r lc5545ld 8 ? 1 DD 250 ns LC5546LD DD 400 ns lc5548ld DD 400 ns thermal resistance r ch-c lc5545ld between channel and case; case temperature, t c , measured at the center of the marking side D DD 42 c/w LC5546LD DD 35.5 c/w lc5548ld DD 40 c/w 4 sanken electric co., ltd. lc5540ld-ds single-stage power factor corrected off-line switching regulators lc5540ld series
10 1 0.1 0.01 transient thermal resistance, r ch-c (c/w) transient thermal resistance curve time (s) 10 ?6 10 ?5 10 ?4 10 ?3 10 ?2 10 ?1 ambient temperature, t a (c) 1.2 1.0 0.8 0.6 0.4 0.2 0 0 255075 125 100 150 mosfet temperature versus power dissipation curve allowable power dissipation, p d1 (w) channel temperature, t ch (c) 100 80 60 40 20 0 25 50 75 125 100 150 eas temperature derating coefficient (%) mosfet avalanche energy derating coefficient curve drain-to-source voltage, v ds (v) 100 10 1 0.1 0.01 1 10 100 1000 drain current, i d (a) mosfet safe operating area curve drain current limited by on-resistance 1 ms 0.1 ms to use this graph, apply the s.o.a temperature derating coefficient taken from the graph at the left channel temperature, t ch (c) 100 80 60 40 20 0 0 25 50 75 125 100 150 safe operating area temperature derating coefficient (%) s. o. a. temperature derating coefficient curve characteristic performance lc5545ld 5 sanken electric co., ltd. lc5540ld-ds single-stage power factor corrected off-line switching regulators lc5540ld series
10 1 0.1 0.01 transient thermal resistance, r ch-c (c/w) transient thermal resistance curve time (s) 10 ?6 10 ?5 10 ?4 10 ?3 10 ?2 10 ?1 ambient temperature, t a (c) 1.2 1.0 0.8 0.6 0.4 0.2 0 0 255075 125 100 150 mosfet temperature versus power dissipation curve allowable power dissipation, p d1 (w) channel temperature, t ch (c) 100 80 60 40 20 0 25 50 75 125 100 150 eas temperature derating coefficient (%) mosfet avalanche energy derating coefficient curve drain-to-source voltage, v ds (v) 100 10 1 0.1 0.01 1 10 100 1000 drain current, i d (a) mosfet safe operating area curve drain current limited by on-resistance 1 ms 0.1 ms to use this graph, apply the s.o.a temperature derating coefficient taken from the graph at the left channel temperature, t ch (c) 100 80 60 40 20 0 0 25 50 75 125 100 150 safe operating area temperature derating coefficient (%) s. o. a. temperature derating coefficient curve characteristic performance LC5546LD 6 sanken electric co., ltd. lc5540ld-ds single-stage power factor corrected off-line switching regulators lc5540ld series
10 1 0.1 0.01 transient thermal resistance, r ch-c (c/w) transient thermal resistance curve time (s) 10 ?6 10 ?5 10 ?4 10 ?3 10 ?2 10 ?1 ambient temperature, t a (c) 1.2 1.0 0.8 0.6 0.4 0.2 0 0 255075 125 100 150 mosfet temperature versus power dissipation curve allowable power dissipation, p d1 (w) channel temperature, t ch (c) 100 80 60 40 20 0 25 50 75 125 100 150 eas temperature derating coefficient (%) mosfet avalanche energy derating coefficient curve drain-to-source voltage, v ds (v) 100 10 1 0.1 0.01 1 10 100 1000 drain current, i d (a) mosfet safe operating area curve drain current limited by on-resistance 1 ms 0.1 ms to use this graph, apply the s.o.a temperature derating coefficient taken from the graph at the left channel temperature, t ch (c) 100 80 60 40 20 0 0 25 50 75 125 100 150 safe operating area temperature derating coefficient (%) s. o. a. temperature derating coefficient curve characteristic performance lc5548ld 7 sanken electric co., ltd. lc5540ld-ds single-stage power factor corrected off-line switching regulators lc5540ld series
functional block diagram functional block diagram functional block diagram pin-out diagram s/gnd tsd leb d/st start up reg bias uvlo vcc ocp ovp ovp osc ocp detection bottom reg control feedback olp drv fb q s r nf control part pin list table number name function 1 s/gnd mosfet source and gnd pin for the control part 2 vcc supply voltage input and overvoltage protection (ovp) signal input 3 ocp overcurrent protection (ocp), quasi-resonant signal input, and overvoltage protection (ovp) signal input 4fb feedback phase-compensation input and overload protection (olp) signal input 5nf no function; must be externally connected to s/gnd pin with as short a trace as possible, for stable operation of the ic 6 ovp overvoltage protection (ovp) signal input 7 ? pin removed 8 d/st mosfet drain pin and input of the startup current 1 2 3 4 8 6 5 d/st ovp nf s/gnd vcc ocp fb 8 sanken electric co., ltd. lc5540ld-ds single-stage power factor corrected off-line switching regulators lc5540ld series
package outline drawing, dip8 0 . 2 5 + 0 . 1 - 0 . 0 5 6.5 1 4 5 8 9.4 0.3 0.5 0.1 0.89 typ 4.2 0.3 3.3 3.4 0.1 0.2 (7.6 typ) 2.54 typ -0.05 -0.05 0.2 0.5 7.5 +0.3 +0.3 1.0 1.52 a lc b c a: part #: 554x b: lot number 3 digits, plus l 1 st letter: last digit of year 2 nd letter: month jan to september: numeric october: o november: n december: d 3 rd letter: week date 1 to 10: 1 date 11 to 20: 2 date 21 to 31: 3 c: internal use control number leadframe material cu pin treatment: solder plating weight approximately 0.51g unit mm pb-free. device composition compliant with the rohs directive. 9 sanken electric co., ltd. lc5540ld-ds single-stage power factor corrected off-line switching regulators lc5540ld series
because reliability can be affected adversely by improper storage environments and handling methods, please observe the following cautions. cautions for storage ? ensure that storage conditions comply with the standard temperature (5c to 35c) and the standard relative humidity (around 40% to 75%); avoid storage locations that experience extreme changes in temperature or humidity. ? avoid locations where dust or harmful gases are present and avoid direct sunlight. ? reinspect for rust on leads and solderability of products that have been stored for a long time. cautions for testing and handling when tests are carried out during inspection testing and other standard test periods, protect the products from power surges from the testing device, shorts between the product pins, and wrong connections. remarks about using silicone grease with a heatsink ? when silicone grease is used in mounting this product on a heatsink, it shall be applied evenly and thinly. if more silicone grease than required is applied, it may produce excess stress. ? volatile-type silicone greases may crack after long periods of time, resulting in reduced heat radiation effect. silicone grease with low consistency (hard grease) may cause cracks in the mold resin when screwing the product to a heatsink. ? our recommended silicone greases for heat radiation purposes, which will not cause any adverse effect on the product life, are indicated below: type suppliers g746 shin-etsu chemical co., ltd. yg6260 momentive performance materials, inc sc102 dow corning toray co., ltd. soldering ? when soldering the products, please be sure to minimize the working time, within the following limits: 2605c 101 s (flow, 2 times) 38010c 3.50.5 s (solder iron, 1 time) ? soldering iron should be at a distance of at least 1.5 mm from the body of the products electrostatic discharge ? when handling the products, the operator must be grounded. grounded wrist straps worn should have at least 1 m of resistance from the operator to ground to prevent shock hazard, and it should be placed near the operator. ? workbenches where the products are handled should be grounded and be provided with conductive table and floor mats. ? when using measuring equipment such as a curve tracer, the equipment should be grounded. ? when soldering the products, the head of soldering irons or the solder bath must be grounded in order to prevent leak voltages generated by them from being applied to the products. ? the products should always be stored and transported in sanken shipping containers or conductive containers, or be wrapped in aluminum foil. 10 sanken electric co., ltd. lc5540ld-ds single-stage power factor corrected off-line switching regulators lc5540ld series
? the contents in this document are subject to changes, for improvement and other purposes, without notice. make sure that this is the latest revision of the document before use. ? application and operation examples described in this document are quoted for the sole purpose of reference for the use of the products herein and sanken can assume no responsibility for any infringement of industrial property rights, intellectual property rights or any other rights of sanke n or any third party which may result from its use. ? although sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of se miconductor products at a certain rate is inevitable. users of sanken products are requested to take, at their own risk, preventative measures including safety design of the equipment or systems against any possible injury, death, fires or damages to the society due to device failure or malfunction. ? sanken products listed in this document are designed and intended for the use as components in general purpose electronic equ ipment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). when considering the use of sanken products in the applications where higher reliability is required (transportation equipment and its control systems, traffic signal control systems or equipment, fire/crime alarm systems, various safety devices, etc.), and whenever long life expectancy is required even in general purpose electronic equipment or apparatus, please contact your nearest sanken sales representative to discuss, prior to the use of the products herein. the use of sanken products without the written consent of sanken in the applications where extremely high reliability is requir ed (aerospace equipment, nuclear power control systems, life support systems, etc.) is strictly prohibited. ? in the case that you use our semiconductor devices or design your products by using our semiconductor devices, the reliabilit y largely depends on the degree of derating to be made to the rated values. derating may be interpreted as a case that an operation range is set by derating the l oad from each rated value or surge voltage or noise is considered for derating in order to assure or improve the reliability. in general, derating factors include electric stresses such as electric voltage, electric current, electric power etc., environmental stresses such as ambient temperature, humidity etc. and thermal stress cau sed due to self-heating of semiconductor devices. for these stresses, instantaneous values, maximum values and minimum values must be taken into consideration. in addition, it should be noted that since power devices or ic?s including power devices have large self-heating value, the deg ree of derating of junction temperature (tj) affects the reliability significantly. ? when using the products specified herein by either (i) combining other products or materials therewith or (ii) physically, ch emically or otherwise processing or treating the products, please duly consider all possible risks that may result from all such uses in advance and proceed therew ith at your own responsibility. ? anti radioactive ray design is not considered for the products listed herein. ? sanken assumes no responsibility for any troubles, such as dropping products caused during transportation out of sanken?s di stribution network. ? the contents in this document must not be transcribed or copied without sanken?s written consent. 11 sanken electric co., ltd. lc5540ld-ds single-stage power factor corrected off-line switching regulators lc5540ld series

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