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issue 4 C june 2011 www.diodes. com ? diodes incorporated, 2011 al9910ev6 isolated led driver user guide fig. 1 al9910ev6 evaluation board connection diagra m warning: danger C high voltages are present on this evaluation board
al9910ev6 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 2 description the al9910ev6 is an offline isolated led driver eva luation board designed to work on 110v ac line volt age. it provides four constant led current outputs which drive four seperate strings of between 8 and 14 le ds, with a led current of 75ma per string. it will provide a total led power ranging from 8w t o 15w. al9910ev6 setup and testing procedure prerequiste 1. al9910ev6 evaluation board. 2. four sets of leds strings with 8 to 14 series-co nnected leds. please note that the number of leds i n each string must be equal. the leds should be mount ed on a heatsink capable of a power dissipation of 8 to 15w. 3. for safety reasons during testing, please use an isolated 110v ac source from the output of an isol ation tranformer. for public demonstration, the evaluatio n board and leds should be fitted into a transparen t case with sufficient insulation to meet the local s afety requirements. connections and power up 1. preset the isolated ac source to either 110vac. 2. ensure that the ac source is switched off or dis connected. 3. solder the anode wires of all led strings to the led+ terminal. 4. solder the cathode wires of the four led strings individually to the led1-, led2-, led3- and led4- terminals. connect ammeters in series with the cath ode wires if led current measurements are required. 5. connect the two ac line wires to the ac1 and ac2 terminals which are located at the bottom left han d corner of the evaluation board. 6. 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. 7. turn on the mains switch. led string should light u p. do not touch the board, leds or bare wiring. caution: the input terminals carry high voltage dur ing operation!
al9910ev6 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 c1, c2, d1, d2, d3 and r1. this design gives power factors of g reater than 0.9. constant current flyback converter section the isolated flyback converter section consists of led controller al9910a (u1), ultra-fast free-wheeli ng rectifier es2g (d6), transformer (t8) and a high vo ltage mosfet switch (q1). on this evaluation board, the al9910a is configured to operate in the constant fr equency mode to provide the best led current regula tion. the switching frequency of the al9910a is set to 10 0khz using resistor r2. please refer to the product datasheet for more details on how to configure the constant frequency mode. the flyback converter have been designed to provide an total output current of 300ma. the led current is regulated with an isolated secondary side feedback, consisting of an opto coupler (u2), sense resistor s (r1, r2) and voltage reference (u3). the led current lev el is set by resistors r1 and r2. the voltage regulator network consisting of q2, r9 and z2 provides stable voltage to the al9910a from the transformer auxillary winding. zener diode z4 and r esistor r13 provides protection to the power stage under open led condition. multi-channel led current balancing section in this section of the evaluation board, bipolar tr ansistors q4-q7 are connected as current mirror to provide an effective led current balancing function to drive u p to 4 strings of leds with minimal losses. the tra nsistors are mounted as close to one another on the pcb to a chieve the best possible thermal coupling. r16, r17 , r22 and r23 are the transistors emitter resistors added to improve the led current balancing.
al9910ev6 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 4 fig. 2 al9910ev6 schematic diagram al9910a
al9910ev6 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 5 parts list ref description p/n p ac k a g e m anu f acturer u1 universal high brightness led driver al9910a so8 diodes inc u2 opto coupler ctr 80-160% fod817a300 fairchild u3 shunt regulator ztlv431 sot23 diodes inc q1 n-ch 600v mosfet 3.2a, q g(max) = 16nc spb03n60s5 to252 infineon q2 npn transistor mmbt2222a sot23 diodes inc q3 60v npn transistor mmbta06 sot23 diodes inc q4, q5, q6, q7 60v npn transistor FZT853 sot223 diodes inc d1, d2, d3 1a 1kv diode t rr =1.8 s s1m-13-f sma diodes inc d4 400v 1a ultrafast recovery diode mur140 do-41 diodes inc d5 150v 400ma switching diode bav20w-7 sod123 diodes inc d6 400v 2a ultrafast recovery diode es2g smb diodes inc db1 1a, 600v bridge rectifier df06s diodes inc z1 100v 1w zener 1n4764ado41 do-41 diodes inc z2 9.1v 50mw zener bzt52c9v1-7 sod123 diodes inc z3 16v 500mw zener ddz9703 sod123 diodes inc z4 56v 500mw zener mmsz5263b sod123 diodes inc r1 10r 3w resistor, +/-50ppm/c, +/-1% generic wire wound r2 226k 0.125w +/-1% generic 0805 r3,r4 0r 0.125w +/-5% generic 0805 r5 0r5 0.25w +/-1% generic 1206 r6 5k6 0.125w +/-5% generic 0805 r7 100k 0.125w +/-5% generic 0805 r8, r10 5k1 0.125w +/-5% generic 0805 r9 1k 0.125w +/-5% generic 0805 r11 10k 0.25w +/-5% generic 1206 r13 20k 0.125w +/-5% generic 0805 r14 470r 0.125w +/-5% generic 0805 r15, r20 8r2 0.33w +/-1% generic 1206 r16, r17, r22, r23 2r2 0.25w +/-1% generic 1206 r18, r19, r24, r25 0r 0.25w +/-1% generic 1206 r21 1r 0.25w +/-1% generic 1206 f1 10r 1w fusible resistor +/-200ppm generic c1,c2 33 f 450v electrolytic capacitor eeued2e330 panasonic c4,c11 4.7 f 25v x7r 1206 c5 1 f 50v x7r 1206 c7,c8 33 f 63v c10 100nf 16v x7r 0805 cx1,cx2, cx3, cx4 100nf 275vac, film, x2, 20% ecqu2a104ml panasonic mov1 275v varistor, 21j b72207s0271k101 5mm pitch epcos l1 6.8mh 290ma 19r685c murata l2 30mh 300ma common mode choke b82791g2301n001 epcos t1 800 h flyback transformer turn ratio = 1.76:1 owtr-pt25c774 eer25 olewoff
al9910ev6 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 6 performance efficiency vs input voltage 70 75 80 85 90 85 90 95 100 105 110 115 120 125 130 input voltage (v) efficiency (%) . 12 leds 10 leds 8 leds power factor vs input voltage 0.70 0.75 0.80 0.85 0.90 0.95 1.00 85 90 95 100 105 110 115 120 125 130 input voltage (v) power factor . 12 leds 10 leds 8 leds
al9910ev6 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 7 led current vs input voltage (12 leds) 50.00 60.00 70.00 80.00 90.00 100.00 85 90 95 100 105 110 115 120 125 130 input voltage (v) led current (ma) . led1- led2- led3- led4- operating waveforms during normal operation (orange : al9910as gate output voltage; green: q1s drain current; blue: q1s drain voltage)
al9910ev6 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 8 operating waveforms during start up condition (oran ge: al9910as gate output voltage; green: q1s drain current; blue: q1s drain voltage)
al9910ev6 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 9 intentionally blank
al9910ev6 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 10 intentionally blank
al9910ev6 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 11 intentionally blank
al9910ev6 issue 4 C june 2011 www.diodes.com ? diodes incorporated 2011 12 sales offices the americas 3050 e. hillcrest drive westlake village, ca 91362-3154 tel: (+1) 805 446 4800 fax: (+1) 805 446 4850 europe kustermannpark balanstra?e 59, d-81541 mnchen germany tel: (+49) 894 549 490 fax: (+49) 894 549 4949 taiwan 7f, no. 50, min chuan road hsin-tien taipei, taiwan tel: (+886) 289 146 000 fax: (+886) 289 146 639 shanghai rm. 606, no.1158 changning road shanghai, china tel: (+86) 215 241 4882 fax (+86) 215 241 4891 shenzhen room a1103-04, anlian plaza, #4018 jintian road futian cbd, shenzhen, china tel: (+86) 755 882 849 88 fax: (+86) 755 882 849 99 korea 6 floor, changhwa b/d, 1005-5 yeongtong-dong, yeongtong-gu, suwon-si, gyeonggi-do, korea 443-813 tel: (+82) 312 731 884 fax: (+82) 312 731 885 important notice diodes incorporated makes no warranty of any kind, express or implied, with regard to this document, including, but not limited to, the implie d warranties of merchantability and fitness for a particular purpose (and their equival ents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve th e right to make modifications, enhancements, improv ements, corrections or other changes without further notice to this document and any product described herein. diodes incorporated does not assume any liability arising out of the ap plication or use of this document or any product de scribed herein; neither does diodes incorporated convey any license under i ts patent or trademark rights, nor the rights of ot hers. any customer or user of this document or products described here in in such applications shall assume all risks of s uch use and will agree to hold diodes incorporated and all the companies w hose products are represented on diodes incorporate d website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products pur chased through unauthorized sales channels. should customers purch ase or use diodes incorporated products for any uni ntended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any c laim of personal injury or death associated with such unintended or unauthoriz ed application. products described herein may be covered by one or more united states, international or foreign patent s pending. product names and markings noted herein may also be covered by one or more united states, international or for eign trademarks. life support diodes incorporated products are specifically not a uthorized for use as critical components in life su pport devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to per form when properly used in accordance with instruct ions for use provided in the labeling can be reasonably expecte d to result in significant injury to the user. b. a critical component is any component in a lif e support device or system whose failure to perform can be reasonably be expected to cause the failure of the life suppor t device or to affect its safety or effectiveness. customers represent that they have all necessary ex pertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulato ry and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-crit ical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representati ves against any damages arising out of the use of diodes incorporat ed products in such safety-critical, life support d evices or systems. copyright ? 2009, diodes incorporated www.diodes.com

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