c o p y r igh t @ w i n s em i microelectronics c o . , lt d . , a l l ri g h t r e s er v ed . w/t-s025-rev.a/ 1 may .201 4 w s 3220a product description win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics 1113 features features features features built-in 6 5 0 v power mosfet 5% led current accuracy primary-side sensing and regulation without tl431 and opto-coupler no auxiliary winding for sensing and supplying ultra low operating current led open/short circuit protection cs resistor short circuit protection vcc clamp & under voltage lockout( uvlo) over temperature protection applications applications applications applications gu10 led driver led spot light other led lighting general general general general description description description description WS3220A is a high precision primary-side feedback and regulation controller for led lighting, it operates in constant current control mode and is designed to work in inductor current discontinuous conduction mode and especially suitable for flyback convertor under universal input. the output power of system is recommended to less than 5w. WS3220A integrates 6 5 0 v power mosfet. since adopting primary sense and feedback control technology, the secondary sense and feedback circuit is eliminated. and it does not need the auxiliary winding for sensing the output current and supplying the chip. the low component counts and small system size are realized. since using the high accurate current sense method, WS3220A realizes 5% accuracy of led current along with excellent line and load regulation. WS3220A offers comprehensive protection including cycle-by-cycle current limiting (ocp), led open/short circuit protection, cs resistor short circuit protection, vcc uvlo and clamp, and over temperature protection. WS3220A is available in sop8 package. typical typical typical typical application application application application circuit circuit circuit circuit WS3220A WS3220A WS3220A WS3220A high high high high precision precision precision precision psr psr psr psr constant constant constant constant current current current current led led led led driver driver driver driver a c n p n s 1 2 3 4 8 7 6 5 o u t v c c c s g n d n c n c d r a in d r a in
c o p y r igh t @ w i n s em i microelectronics c o . , lt d . , a l l ri g h t r e s er v ed . w/t-s025-rev.a/ 1 may .201 4 w s 3220a product description win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics 1113 pin pin pin pin definition definition definition definition and and and and device device device device marking marking marking marking WS3220A is offered in sop-8 packages as shown below pin pin pin pin function function function function description description description description pin pin pin pin name name name name pin pin pin pin number number number number pin pin pin pin type type type type function function function function description description description description cs 1 current sense current sense. this pin connects a current sense resistor to gnd to detect the primary current of transformer. gnd 2 ground ground. vcc 3 power supply power supply. out 4 source internal high voltage mosfet source. drain 5,6 drain internal high voltage mosfet drain. nc 7,8 nc no connection, must be floated block block block block diagram diagram diagram diagram WS3220A s8p : product code a: die code x: internal code b: area code ym year, month line compensation &jitter r e s e t 9 . 0 v 1 3 . 8 v v c c 0 . 5 v o c p cc&loigc control o v p bg&inter power supply t o n s v c c d r a in o u t c s g n d u v l o 1 5 v 6 5 0 v m o sfe t o c p o t p tons detect t o n s v c c o u t l e b 18v c s g n d v c c o u t d r a i n d r a i n n c n c 1 2 3 4 8 7 6 5 w s 3 2 2 0 a s 8 p a x b y m
www.winsemi.com tel : +86- 755-8250 6288 fax : +86- 755-8250 6299 3 / 9 win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics w s 3220a product description ordering ordering ordering ordering information information information information package package package package ic ic ic ic marking marking marking marking information information information information purchasing purchasing purchasing purchasing device device device device name name name name sop8, pb-free WS3220A s 8 p WS3220A s 8 p recommended recommended recommended recommended operating operating operating operating condition condition condition condition symbol symbol symbol symbol parameter parameter parameter parameter value value value value unit unit unit unit vcc vcc supply voltage 9~15 v t a operating temperature -20~85 absolute absolute absolute absolute maximum maximum maximum maximum ratings ratings ratings ratings symbol symbol symbol symbol parameter parameter parameter parameter value value value value unit unit unit unit icc_max vcc pin maximum sink current 5 ma drain internal hv mosfet drain voltage -0.3~ 6 5 0 v cs cs pin input voltage -0.3~7 v out out pin input voltage -0.3~18 v t j operating junction temperature -40~150 t stg min./max. storage temperature -55~150 note note note note : stresses above those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated in the recommended operating conditions section are not implied. exposure to absolute maximum-rated conditions for extended periods may affect device reliability.
www.winsemi.com tel : +86- 755-8250 6288 fax : +86- 755-8250 6299 4 / 9 win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics w s 3220a product description electrical electrical electrical electrical characteristics characteristics characteristics characteristics (t a =25 vcc=14v, if not otherwise noted) symbol symbol symbol symbol parameter parameter parameter parameter test test test test condition condition condition condition min min min min typ typ typ typ max max max max unit unit unit unit supply supply supply supply voltage voltage voltage voltage (vcc) (vcc) (vcc) (vcc) i_vcc_st start up current vcc=uvlo_on-1v - 60 100 ua i_op operation current fop=50khz - 150 250 ua uvlo_on turn on threshold voltage vcc rising 12.5 13.8 15.5 v uvlo_off turn-off threshold voltage vcc falling 8 9 10 v vcc_clamp vcc clamp voltage icc=1ma - 18.2 - v current current current current sense sense sense sense section section section section tleb leading edge blanking time - 500 - ns v th _oc ocp threshold 485 500 515 mv tdelay switch off delay time - 100 - ns frequency frequency frequency frequency section section section section fmin minimum operation frequency - 5 - khz f max m ax imum operation frequency - 90 - khz maximum maximum maximum maximum duty duty duty duty cycle cycle cycle cycle dmax maximum duty cycle - 42 - % mosfet mosfet mosfet mosfet section section section section rds_on static drain-source on-resistance vgs=1 0 v/ids=0. 4 a - - 17 bvdss drain-source breakdown voltage vgs=0v/ids=250ua 6 5 0 - - v idss drain-source leakage current vgs=0v/vds= 6 5 0 v - - 10 ua over over over over temperature temperature temperature temperature protection protection protection protection tsd thermal shutdown threshold - 150 - tsd_hys thermal shutdown hysteresis - 25 -
www.winsemi.com tel : +86- 755-8250 6288 fax : +86- 755-8250 6299 5 / 9 win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics w s 3220a product description typical typical typical typical operating operating operating operating characteristics characteristics characteristics characteristics uvlooff vs temperature 13.65 13.70 13.75 13.80 13.85 13.90 -40 -20 0 10 20 40 60 80 100 120 140 150 uvloon vs temperature 8.76 8.78 8.80 8.82 8.84 8.86 8.88 8.90 8.92 -40 -20 0 10 20 40 60 80 100 120 140 150 vref vs temperature 0.501 0.501 0.501 0.501 0.501 0.501 0.501 0.501 0.501 0.501 -40 -20 -10 0 10 20 40 60 80 90 100 120 130 140 150 i_startupua vs temperature 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 -40 -20 -10 0 10 20 40 60 80 100 120 140 150
c o p y r igh t @ w i n s em i microelectronics c o . , lt d . , a l l ri g h t r e s er v ed . w/t-s025-rev.a/ 1 may .201 4 w s 3220a product description win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics 1113 f f f f unction unction unction unction description description description description WS3220A is a high performance power witch specially designed for led lighting, with constant current control technology. WS3220A integrates a 6 5 0 v power mosfet. the accurate led current can be realized without opto-coupler, tl431 feedback circuit and auxiliary winding while minimizing the external component count, lowering the total bill of material cost. startup startup startup startup current current current current he start-up current in WS3220A is designed to as low as 60ua. the vcc capacitor will be charged through the start-up resistor when the system is powered on. once the vcc voltage reaches the start-up threshold, the WS3220A will start to switch. WS3220A integrates a 1 8 v zener for vcc clamping. due to the ultra-low operating current, the auxiliary winding is not needed to supply the ic. cc cc cc cc operation operation operation operation cycle-by-cycle current sense is adopted in WS3220A cs is connected to the current sense comparator, and the voltage on cs will be compared with the internal 500mv reference voltage, the mosfet will be switched off when the voltage on cs reaches the threshold. the output of the comparator includes a 500ns leading edge blanking time. the primary peak current is given by: i_pk=0.5/rcs a the current in led can be calculated by the equation: io=0.5*i_pk*np/ns*tons/t =0.25*i_pk*np/ns =0.125/rcs* np/ns where, np: primary winding turns of transformer ns: secondary winding turns of transformer rcs the value of the sense resistance i_pk: peak current in mosfet and the output current can be set by adjusting the current sense resistor rcs. power power power power mosfet mosfet mosfet mosfet the WS3220A integrates a 6 5 0 v power n-mosfet. it can minimize the external component count and reduce the bom cost and pcb size. the WS3220A uses sop-8 package. the recommended system output power is below 5w in universal input application. operation operation operation operation switching switching switching switching frequency frequency frequency frequency the WS3220A is designed to work in discontinuous conduction mode and no external loop compensation component is required while maintaining stability,the maximum duty cycle is limited to 42%. the maximum switching frequency at normal operation is suggested to set around 50khz~55khz. if the maximum frequency is set too high, it will affect the number of maximum series led lamps. if set too low, the led open circuit voltage will be too high. the maximum and minimum switching frequency is limited in WS3220A to ensure the stability of system. the switching frequency can be set by the formula: f= np 2 *vled/ (8*ns 2 *lp*io) where, lp is the primary winding inductance of transformer. current current current current limiting limiting limiting limiting and and and and leading leading leading leading edge edge edge edge blanking blanking blanking blanking cycle-by-cycle current limiting is offered in WS3220A . the switch current is detected by a sense resistor into the sense pin. an internal leading edge blanking circuit chops off the sense voltage spike at initial mosfet on state due to snubber diode reverse recovery so that the external rc filtering on sense input is no longer required. the current limit comparator is disabled and thus cannot turn off the internal mosfet during the blanking period. protection protection protection protection controls controls controls controls excellent system stability is achieved by the comprehensive protection of WS3220A . including cycle-by-cycle current limiting (ocp), led open/short circuit protection, cs resistor short circuit protection, vcc uvlo and clamp, over temperature protection, and so on. when the led is open circuit, it will trigger over-voltage protection logic and latch, the system stops switching immediately; when the led short circuit is detected, the system works at low frequency(fop=5khz), so the power loss is low. at some catastrophic fault condition, such as shorted cs resistor or flyback transformer saturation, the internal fast fault detection circuit will trigger and latch, the
www.winsemi.com tel : +86- 755-8250 6288 fax : +86- 755-8250 6299 7 / 9 win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics w s 3220a product description system stops switching immediately. after the system enters into fault latch condition, the vcc voltage will fall until it reaches uvlo threshold. then the system will re-start again. if the fault condition is removed, the system will recover to normal operation. the thermal shutdown circuitry in the WS3220A senses the die temperature after start up, and the thermal protection threshold is set to 150 with a 25 hysteresis. when the temperature on die of WS3220A rises and reaches the threshold, the power mosfet will be shut down immediately and maintained switch off until the temperature on die falls 25 from thermal protection trigger point .
www.winsemi.com tel : +86- 755-8250 6288 fax : +86- 755-8250 6299 8 / 9 win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics w s 3220a product description sop-8 sop-8 sop-8 sop-8 package package package package information information information information winsemi winsemi winsemi winsemi symbol symbol symbol symbol dimensions dimensions dimensions dimensions in in in in millimeters millimeters millimeters millimeters dimensions dimensions dimensions dimensions in in in in inches inches inches inches min min min min max max max max min min min min max max max max a 4.70 5.10 0.185 0.201 b 3.70 4.10 0.146 0.161 c 1.30 1.50 0.051 0.059 a1 0.35 0.48 0.014 0.019 a2 1.27typ 0.05typ a3 0.345typ 0.014typ b1 5.80 6.20 0.228 0.244 b2 5.00typ 0.197typ c1 0.55 0.70 0.022 0.028 c2 0.55 0.70 0.022 0.028 c3 0.05 0.225 0.002 0.009 c4 0.203typ 0.008typ d 1.05typ 0.041typ d1 0.40 0.80 0.016 0.031 a b a 1 a 2 a 3 0 . 5 * 0.125 0 05 . b 1 d c 4 c 3 c 1 c c 2 r 2 r 1 1 b 2 3 2 4 d 1
www.winsemi.com tel : +86- 755-8250 6288 fax : +86- 755-8250 6299 9 / 9 win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics win sem i m icroelectron ics w s 3220a product description note: note: note: note: 1. we strongly recommend customers check carefully on the trademark when buying our product, if there is any question, please don't be hesitate to contact us. 2. please do not exceed the absolute maximum ratings of the device when circuit designing. 3. winsemi microelectronics co., ltd reserved the right to make changes in this specification sheet and is subject to change without prior notice. contact: contact: contact: contact: winsemi microelectronics co., ltd. add: room 1002, east, phase 2, hightech plaza,tian-an cyber park,chegongmiao, futian, shenzhen, p.r. china post code : 518040 tel : +86-755-8250 6288 fax : +86-755-8250 6299 web site : www.winsemi.com
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