一款高性价比的隔离型LED射灯方案（LED Driver Design with iW1692）

LED Driver Design with iW1692 Summary and Features : 1. LED driver, 12V, CC@0.35A ; Wide range AC input range @90-264Vac 2 For Isolated or Non-isolated Applications 3. High Efficiency and Minimum Parts count 4. Meet EMI EN55015B-QP & AV limits 5. Fully protected against AC input UV, OV, O/P Short/Open, meet single point failure test. 2iWatt Confidential – Do Not Copy12V/350mA LED Driver 29 Dec 2007 Page: 1. Specification % Free convection, sea level°C50ToprOperation Temperature Safety Meets EN55015BConducted EMI Environmental Measured at end of PCB, (TA = 25℃)75ηEfficiency Auto-restartA0.4IOUT_MAXOver Current Protection W3POUTContinuous Output Power Total Output Power A0.35IOUT_CVOutput Current Min Vout is depend on VccV12VOUT_CVOutput VoltageConst Current A0.35IOUT_CVOutput Current Measured at the PCB connectorV12VOUT_CVOutput VoltageConst Voltage Output WOpen-load Input Power (264VAC) Hz6350/6047fLINEFrequency VAC26490VINVoltage Input CommentUnitsMaxTypMinSymbolDescription 3iWatt Confidential – Do Not Copy12V/350mA LED Driver 29 Dec 2007 Page: 2. Schematic 4iWatt Confidential – Do Not Copy12V/350mA LED Driver 29 Dec 2007 Page: 3.Circuit Board Photograph Top side Bottom side Secondary Secondary Primary Primary 5iWatt Confidential – Do Not Copy12V/350mA LED Driver 29 Dec 2007 Page: MATERIALS: 1. Core : EE13 (Ferrite Material TDK PC40 or equivalent) 2. Bobbin : EE13Vertical 3. Magnet Wires : Type 2-UEW 4. Layer Insulation Tape :3M1298 or equivalent. SCHEMATIC A 168T 28T 28T ELECTRICAL SPECIFICATIONS: 1. Primary Inductance (Lp) = 2mH @10KHz 2. Primary Leakage Inductance (Lk)≤50uH@10KHz FINISHED : 1. Cut remained of Pin3,4,7,8,9,10 after wires termination 2. Varnish the complete assembly 3. Core is connected to pin2 ( primary ground ) 5 6 1 2 Primary Bias 4. Transformer Design 2UEW 0.15mmx1 42T – Primary 2UEW 0.15mmx1 42T – Primary 1(S) 2UEW 0.10mmx2 28T –Bias 2(F) 2UEW 0.15mmx1 42T – Primary 0.28mmx1 14T –Secondary Triple Insulation wire 2UEW 0.15mmx1 42T – Primary Primary Second Cuffing Tape {20(L)x7(W)}mm Small solder Joint with fine wire Finished Assembly Fold up both side of Tape Cut Copper Foil (7x20x0.05)mm B Copper Foil 7(W)X20(L)mm – Shield 0.28mmx1 14T –Secondary Triple Insulation wire A(S) B(F) 6(S) 5(F) 2(S) 6iWatt Confidential – Do Not Copy12V/350mA LED Driver 29 Dec 2007 Page: 5. Bill of Material Item Qty. Ref. Description Cost (US Cent) / unit Sub-Total (Cent) 1 1 U1 iW1692, Off-line digital PWM Controller, SOT-6 2 1 C5 470pF, 50V, NPO, SMD-0603 3 1 C4 68pF, 50V, NPO, SMD-0603 4 1 R1 4.7KΩ ±5﹪, SMD-0603 5 2 R2,R3 2.4MΩ,±5﹪, SMD-1206 6 1 R4 2Ω±5﹪, SMD-0805 7 1 R7 22KΩ±5﹪, SMD-0805 8 1 R6 300Ω±5﹪, SMD-0805 9 1 R9 10KΩ ±5﹪, SMD-1206 10 1 R8 3KΩ,±5﹪,SMD-0603 11 1 R11 100KΩ ±5﹪, SMD-1206 12 1 R5 22KΩ ±5﹪, SMD-0603 13 1 C8 1nF, 1KV, Ceramic Capacitor,SMD-1206 14 1 C2 4.7uF/25V, SMD-1206 15 1 C1 6.8uF, 400V, E-CAP, 105'C 16 1 C6 10uF, 25V,SMD-1206 17 1 BR1 MB8S 18 1 D3 1N4148 0.1A/100V, LL-34 19 1 F1 10R,1W, FUSE Resistor 20 1 L1 4.7mH, 0410 21 1 Q1 01N60, TO-92 22 1 D4 US1D,SMD 23 1 D1 1N4007, SMD 24 1 T1 EE13, Transformer 7iWatt Confidential – Do Not Copy12V/350mA LED Driver 29 Dec 2007 Page: 6. Regulation, Efficiency Measurement * Note: Output voltage measured at end of PCB. 0 10 20 30 40 50 60 70 80 80 100 120 140 160 180 200 220 240 260 280 Vin(Vac) E f f ( % ) 8iWatt Confidential – Do Not Copy12V/350mA LED Driver 29 Dec 2007 Page: VIN=264Vac, TAMB=25℃VIN=90Vac, TAMB=25℃ 7. Output VI Characteristics * Note: Output voltage measured at PCB end, TAMB=25 ℃ V-I Curve 0 2 4 6 8 10 12 14 0 50 100 150 200 250 300 350 400 450 500 Iout Vout V-I Curve 0 2 4 6 8 10 12 14 0 50 100 150 200 250 300 350 400 450 500 Iout Vout 9iWatt Confidential – Do Not Copy12V/350mA LED Driver 29 Dec 2007 Page: 8. VDS waveform Test Condition: VIN=264VAC, IOUT_CV=350mA Result: VDS_MAX=534V Remark: Mosfet Spec_1A 600V 10iWatt Confidential – Do Not Copy12V/350mA LED Driver 29 Dec 2007 Page: 9. Start Up & Turn On Delay Time 100VAC,Full Load TST_DELAY=2.2S 264VAC,Full Load TST_DELAY=990mS 11iWatt Confidential – Do Not Copy12V/350mA LED Driver 29 Dec 2007 Page: 10. Conducted EMI ( Input 230Vac Full Load ) Live Scan Neutral Scan QP Scan AV Scan QP Scan AV Scan