issue 4 C june 2011 www.diodes. com ? diodes incorporated, 2011 al9910ev4 buck led driver user guide fig. 1 al9910ev4 evaluation board connection diagr am 14 -18 series-connected leds
al9910ev4 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 2 description the al9910ev4 is an offline non-isolated led driver evaluaton board designed to work on both 115v and 230v ac line voltages. it provides a constant led c urrent output which drives a single string of betwe en14 and 18 leds, with a led current of 180ma. the evalution board is designed with a footprint to fit iinside a t8 led fluorescent replacement lamp tube. it will provide a total led power ranging from 7w to 1 0w. al9910ev4 setup and testing procedure prerequiste 1. al9910ev4 evaluation board. 2. a set of 180ma leds strings with 14 to 18 series -connected leds. the leds should be mounted on a heatsink capable of a power dissipation of 7 to 10w . 3. for safety reasons during testing, please use an isolated 115v or 230v ac source from the output of an isolation tranformer. for public demonstration, the evaluation board and leds should be fitted into a transparent case with sufficient insulation to meet the local safety requirements. connections and power up 1. preset the isolated ac source to either 115vac o r 230vac. 2. ensure that the ac source is switched off or dis connected. 3. connect the anode wire of the led string to the led+ terminal which is located at the right hand si de of the evaluation board. 4. connect the cathode wire of the led string to th e led - terminal which is located at the right hand side of the evaluation board. 5. connect a voltmeter & ammeter according to the c onnection diagram in figure 1, if led current and voltage measurements are required. 6. connect the two ac line wires to the ac1 and ac2 terminals which are located at the left hand side of evaluation board. 7. ensure that the area around the board is clear a nd safe, and preferably that the board and leds are enclosed in a transparent safety cover. 8. turn on the mains switch. led string should light u p with led current of 180ma +/-15%. do not touch the board, leds or bare wiring. caution: the al9910ev4 is a non-isolated design. al l terminals carry high voltage during operation!
al9910ev4 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 3 operation the al9910a device is a pwm high-efficiency led dri ver control ic. it allows efficient operation of hi gh brightness (hb) leds from voltage sources ranging f rom 85vac up to 265vac. the al9910a can be configured to work in either fixed frequency or con stant off-time mode. in fixed frequency mode, the al9910a controls an external mosfet at a fixed swit ching frequency up to 300khz, which can be programmed using a single resistor. the led string is driven at a constant current rather than at a co nstant voltage, thus providing constant light output and e nhanced reliability. the output current can be prog rammed between a few milliamps and more than 1.0a. input filter and rectifier section in order to meet the emi requirement, cx1, cx2, cx3 , cx4, l1 and l2 are used to provide sufficient fil tering for both differential-mode and common-mode noise ge nerated from the switching converter circuit after the bridge rectifier. the rectified line voltage from the bridge rectifie r db1 is fed into a valley-filled passive power fac tor correction stage to provide a high power factor for the ac lin e input. the passive pfc stage comprises of c11, c2 , d1, d2, d3 and r1. this design gives power factors of g reater than 0.9 at low line voltage. constant current buck converter section the buck converter section consists of led controll er al9910a (u1), ultra-fast free-wheeling rectifier sf30jg (d4), inductor (l3 and l4) and a high voltage mosfe t switch (q1). on this evaluation board, the al9910 a is configured to operate in the constant off-time mode to provide the best led current regulation. the co nstant off-time of the al9910as gate output is set to app roximately 14 s using resistor r9. please refer to the product datasheet for more details on how to config ure the constant off-time mode. the circuit values have been designed to provide an output current of 180ma. the led current level is set by resistors r5-r7. for detailed applications informat ion please refer to the al9910/a datasheet. there is also provision for an optional gate transi stor pair (q2) to drive a mosfet with a higher gate charge if a higher led current is required. q2 is a high curr ent gate driver in a sot23-6 package.
al9910ev4 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 4 fig. 2 al9910ev4 schematic diagram al9910a
al9910ev4 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 5 parts list ref description p/n package manufacturer u1 universal high brightness led driver al9910a so8 diodes inc d1 d2 d3 1a 1kv diode t rr =1.8 s s1m-13-f sma diodes inc d4 ultra-fast-recovery diode 3a 600v t rr =50ns sf30jg-b do201ad diodes inc db1 1a, 600v bridge rectifier df06s df-s diodes inc c1 c2 15 f 450v electrolytic capacitor +/-20% 1000hrs @ 105c eeued2w150 400kxw27m10x30 ucy2g150mpd 5mm pitch panasonic rubycon nichicon c3 c6 omit 1206 c4 4.7 f 50v electrolytic capacitor +/-20% 1000hrs @ 105c ece-a1hkg4r7 1.5mm pitch panasonic c5 10 f 450v electrolytic capacitor +/-20% 1000hrs @ 105c, 10mm diameter eeuee2w100u 5mm pitch panasonic cx1 cx2 cx3 cx4 100nf, 275vac, film, x2 ecqu2a104ml 15mm pitch pana sonic f1 10ohm 1w fusible resistor +/- 200ppm nfr0100001009jr5 00 through-hole axial vishay jp1 link with 22 to 26 swg tinned copper wire l1 l4 6.8mh inductor +/-10% 290ma radial 19r685c 6mm pitch murata l2 22mh or 30mh common mode inductor, 8mm height b82791g2351n001 b82791g2301n001 epcos epcos l3 3.3mh inductor +/-10% 420ma radial 19r335c 6mm pitch murata mov1 275v, 21j, 9mm, radial b72207s0271k101 5mm pit ch epcos ntc1 wire link q1 n-ch 600v mosfet 3.2a, q g(max) = 16nc spb03n60s5 to263 infineon q2 not fitted sot23-6 r1 10r 3w wirewound resistor, +/- 50ppm/c, +/-1% UB3C-10RF1 through-hole axial riedon r2 3k 0.25w resistor +/-5% any 1206 any r4 0r 0.125w resistor +/-5% any 0805 any r5 r6 2r7 0.25w +/-1% any 1206 any r7 22r 0.25w +/-1% any 1206 any r3 r8 ra rb not fitted 1206 r9 330k 0.25w resistor +/-1% any 1206 any r10 10r 0.25w +/-5% any 1206 any zd1 0r 0.25w +/-5% any 1206 any
al9910ev4 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 6 performance
al9910ev4 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 7
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