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dmb technology preliminary 4 lamps inverter application datasheet using DT8211 ? 2008 dmb tech. all rights reserved application circuit rev1.0 C 18 april 2008 1 of 11 DT8211 application (19 wide & 20.1 wide panel) 4 lamps inverter application datasheet using DT8211 rev1.0 - 18 april 2008 application datasheet 1. general description this application is an example circuit of 4 lamps inverter using DT8211. the design contains protection functions such as olp, ovp, scp and basic functions such as adim (analog dimming) and bdim (burst dimming). this design is intended to show how to use DT8211, implement basic functions and protection functions, and design a circuit. this document contains features, schematic, and bill of materials. 2. features n fixed frequenc y half bridge topolog y n designed for 4 lamp inverter solution n positive polarit y analog dimming (negative polarit y possible) n positive polarit y internal burst dimming (negative polarit y possible) n adim & bdim polarit y selectable n simultaneous operation of adim and bdim n open lamp protection n open lamp voltage regulation (over voltage protection) n short circuit protection (hot-gnd, cold-gnd) 3. applications n 4 lamp ccfl backlight inverter module n monitor n tv n advertisement board
dmb technology DT8211 application 4 lamps inverter application datasheet using DT8211 ? 2008 dmb tech. all rights reserved application circuit rev1.0 C 18 april 2008 2 of 11 4. pinning information pin symbol description 1 vcc power input 2 en on/off control pin 3 bdim burst dimming dc level 4 adim analog dimming dc level 5 gnd ground 6 gnd ground 5. absolute maximum ratings parameter symbol conditions unit input suppl y voltage v in +45.0 v 6. electrical characteristics t a = 25 c, unless otherwise specified parameter symbol conditions min typ max unit power supply section input voltage v in 12.0 v input current i in v in =12.0v 2.5 a general function section adim input v adim 0 3.3 v bdim input v bdim 0 4.5 v v adim =3.3v v bdim =4.5v 6.8 7.5 8.0 ma v adim =0v v bdim =4.5v 2.5 3.5 4.5 ma output current i out v adim =3.3v v bdim =0v 2.5 3.5 4.5 ma enable input for turn-on v on 2.0 v in v enable input for turn-off v off 0 0.8 v oscillator section main oscillation frequenc y f main 50 khz burst oscillation frequenc y f burst 300 hz protection function section open lamp protection time t olp 1 2 sec. over voltage protection v ovp 1600 v
dmb technology DT8211 application 4 lamps inverter application datasheet using DT8211 ? 2008 dmb tech. all rights reserved application circuit rev1.0 C 18 april 2008 3 of 11 7. schematic d1 bav70 2 1 3 j1 25043wr-06 1 2 3 4 5 6 d6 bav70 2 1 3 vref adim c3 3216/10uf/16v r23 47k/1% d d s s q2 stm8319 3 2 1 4 8 7 5 6 c1 3216/10uf/16v c35 3.3n 1.vcc = 12+-10% 2.ena = ttl level 3.bdim = 0~4.5v(p) 4.adim = 0~3.3v(p) 5.gnd 6.gnd pin description specification lamp frequency = 50khz burst frequency = 300hz output current = 3.5ma~7.5ma striking voltage = 1.6kv rms vcc vref r8 3k r9 3k r10 3k r11 3k r22 470/1% c36 3.3n r5 nc r21 470/1% r20 470/1% bdim_in en_in r19 470/1% hout r18 2k/1% r17 2k/1% c32 1u r16 2k/1% vcc r15 2k/1% vfb1 vfb4 c30 10n c15 1n c29 10n c28 10n c27 10n c12 3pf/3kv r12 47k u1 DT8211 vref 1 en 2 vcmp 13 gnd 14 icmp 12 ct 7 vfb 11 vcc 18 ifb 10 hout 17 bdim 4 rts 5 rt 6 ctb 8 adim 3 prot 9 gnd 15 lout 16 c11 3pf/3kv lout c9 3pf/3kv c8 3pf/3kv d2 bav70 2 1 3 j2 35001wr-02 1 2 c2 3216/10uf/16v d3 bav70 2 1 3 j3 35001wr-02 1 2 j4 35001wr-02 1 2 j5 35001wr-02 1 2 d4 bav70 2 1 3 d5 bav70 2 1 3 bdim c38 nc adim t1 2 1 3 4 8 7 9 6 c34 3.3n vfb1 hout bdim d d s s q1 stm8319 3 2 1 4 8 7 5 6 vfb2 lout vfb3 lv1 lv2 lv4 vfb4 fu1 3216/3.0a/24v c16 100n bdim_in c17 1n adim_in ifb + c5 25v/1000uf lv3 r13 100k c18 100p/cog hv1 hv2 hv3 hv4 c37 3.3n c19 6.8n lv2 lv3 lv4 lv1 c20 1.5n c21 220n vref en_in hv3 hv2 hv1 c22 1n c23 1n r14 100k c24 47n vfb2 ifb vfb3 c25 330n hv4 adim_in lout hout c26 100n vcc r1 11k r6 4.3k r3 18k c13 100n vref r2 22k r7 9.1k r4 9.1k c14 100n c31 1u
dmb technology DT8211 application 4 lamps inverter application datasheet using DT8211 ? 2008 dmb tech. all rights reserved application circuit rev1.0 C 18 april 2008 4 of 11 8. bill of material item q ty reference number part number resistor 1 r1 11k resistor 1 r2 22k resistor 1 r3 18k resistor 2 r4,r7 9.1k resistor 1 r6 4.3k resistor 4 r8,r9,r10,r11 3k resistor 2 r12, r23 47k/1% resistor 2 r13,r14 100k resistor 4 r15,r16,r17,r18 2k/1% resistor 4 r19,r20,r21, r22 470/1% capacitor 3 c1,c2,c3 3216/10uf/16v capacitor 1 c5 25v/1000uf capacitor 4 c8,c9,c11,c12 3pf/3kv capacitor 4 c13,c14, c16,c26 100n capacitor 1 c25 330n capacitor 4 c15,c17,c22,c23 1n capacitor 1 c18 100p/cog capacitor 1 c19 6.8n capacitor 1 c20 1.5n capacitor 1 c21 220n capacitor 1 c24 47n capacitor 4 c27,c28,c29,c30 10n capacitor 2 c31, c32 1u capacitor 4 c34,c35,c36,c37 3.3n resistor/capacitor 2 r5, c10 nc diode 6 d1,d2,d3,d4,d5,d6 bav70 fuse 1 fu1 3216/3.0a/24v connector 1 j1 j-25043wr-06 connector 4 j2,j3,j4,j5 j-35001wr-02 fet 2 q1, q2 stm8319 transformer 1 t1 4 in 1 c 1 u1 DT8211
dmb technology DT8211 application 4 lamps inverter application datasheet using DT8211 ? 2008 dmb tech. all rights reserved application circuit rev1.0 C 18 april 2008 5 of 11 9. test data adim & bdim max output current waveform v in = 12v, v bdim = 4.5v, v adim = 3.3v, unless otherwise specified. j2 output current = 7.82marms j3 output current = 7.78marms j4 output current = 7.69marms j5 output current = 7.60marms
dmb technology DT8211 application 4 lamps inverter application datasheet using DT8211 ? 2008 dmb tech. all rights reserved application circuit rev1.0 C 18 april 2008 6 of 11 9. test data adim min output current waveform v in = 12v, v bdim = 4.5v, v adim = 0v, unless otherwise specified. j2 output current = 3.88marms j3 output current = 3.79marm j4 output current = 3.60marms j5 output current = 3.41marms
dmb technology DT8211 application 4 lamps inverter application datasheet using DT8211 ? 2008 dmb tech. all rights reserved application circuit rev1.0 C 18 april 2008 7 of 11 9. test data bdim min output current waveform v in = 12v, v bdim = 0v, v adim = 3.3v, unless otherwise specified. j2 output current = 3.22marms j3 output current = 3.21marms burst frequency = 297.7hz burst frequency = 296.8hz j4 output current = 3.24marms j5 output current = 3.23marms burst frequency = 298.2hz burst frequency = 296.6hz
dmb technology DT8211 application 4 lamps inverter application datasheet using DT8211 ? 2008 dmb tech. all rights reserved application circuit rev1.0 C 18 april 2008 8 of 11 9. test data output voltage waveform v in = 12v, v bdim = 4.5v, v adim = 3.3v, unless otherwise specified. j2 output voltage = 688vrms j3 output voltage = 675vrms j4 output voltage = 687vrms j5 output voltage = 684vrms
dmb technology DT8211 application 4 lamps inverter application datasheet using DT8211 ? 2008 dmb tech. all rights reserved application circuit rev1.0 C 18 april 2008 9 of 11 9. test data hout & lout waveforms v in = 12v, v bdim = 4.5v, v adim = 3.3v, unless otherwise specified. cyan waveform = u1.17 hout waveform blue waveform = u1.16 lout waveform blue waveform = u1.16 lout waveform green waveform = current waveform
dmb technology DT8211 application 4 lamps inverter application datasheet using DT8211 ? 2008 dmb tech. all rights reserved application circuit rev1.0 C 18 april 2008 10 of 11 9. test data open lamp protection (olp) waveform v in = 12v, v bdim = 4.5v, v adim = 3.3v, unless otherwise specified. j2 str. voltage = 1.76kvrms j3 str. voltage = 1.84kvrms olp time = 1.44sec olp time = 1.43sec j4 str. voltage = 1.91kvrms j5 str. voltage = 1.76kvrms olp time = 1.43sec olp time = 1.43sec
dmb technology DT8211 application 4 lamps inverter application datasheet using DT8211 ? 2008 dmb tech. all rights reserved application circuit rev1.0 C 18 april 2008 11 of 11 9. test data components temperature t a = 25 c, v in = 12v, unless otherwise specified. condition reference number components temperature u1 DT8211 45.4 q1, q2 mosfet(stm8319) 60.1 , 65.8 t1 transformer 54 bdim=4.5v, adim=3.3v c5 electronics capacitor 45.7 10. important notices n this document can be added or changed without notice. before considering use or application, y ou d better consult the d.m.b technolog y co., ltd. n no part of this publication ma y be reproduced or transmitted or copied in an y form or b y an y means without permission of d.m.b technolog y . n although our design has internal protective circuit, y ou d better adopt safet y circuits or measures externall y to prevent undesired probabilistic device failure. 11. contact information for technical information wshan@dmbtech.com for sales information sales@dmbtech.com for additional information http://www.dmbtech.com

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