LED Driver Design with iW3620 _14V350mA Summary and Features : 1. LED driver, 14V, ; Wide AC input 264Vac 2 For Isolated or Non-isolated.

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Presentation transcript:

LED Driver Design with iW3620 _14V350mA Summary and Features : 1. LED driver, 14V, ; Wide AC input 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.

iWatt Confidential – Do Not Copy 14V/350mA LED Driver15 Jan 2009 Page: 2 1. Specification DescriptionSymbolMinTypMaxUnitsComment Input VoltageV IN 90110/230264V AC 2 Wire Frequencyf LINE 4750/6063Hz Open-load Input Power (264V AC ) W Output Const Voltage Output VoltageV OUT_CV 14V Measured at the PCB connector Output CurrentI OUT_CV A Const Current Output VoltageV OUT_CV V Min Vout is depend on Vcc Output CurrentI OUT_CV 0.35A Total Output Power Continuous Output PowerP OUT 4W Over Current ProtectionI OUT_MAX 0.35A Auto-restart Efficiency  82% Measured at end of PCB, (T A = 25 ℃ ) Environmental Conducted EMIMeets EN55015B Safety Operation TemperatureT opr 50°C Free convection, sea level

iWatt Confidential – Do Not Copy 14V/350mA LED Driver15 Jan 2009 Page: 3 2.Schematic circuit

iWatt Confidential – Do Not Copy 14V/350mA LED Driver15 Jan 2009 Page: 4 3.Circuit Board Photograph Top side Bottom side

iWatt Confidential – Do Not Copy 14V/350mA LED Driver15 Jan 2009 Page: 5 3(F)3(F) Secondary PRI 2UEW 0.24mm*1*34T – Primary (Clockwise) 2(F)2(F) Triple Insulated Wire 0.28mm*1*18T –Secondary (Anti-Clockwise) 4(S) MATERIALS: 1.Core : EFD15 (Ferrite Material TDK PC40 or equivalent) 2.Bobbin : Primary=4pin secondary=4pin. 3.Magnet Wires Pri : Type 2-UEW 4.Magnet Wire (Sec) : Triple Insulated Wires 5.Layer Insulation Tape :3M1298 or equivalent. SCHEMATIC A(S) B(F) ELECTRICAL SPECIFICATIONS: 1.Primary Inductance (Lp) = 2.Primary Leakage Inductance (Lk)< = 3.Electrical Strength = 3KV, 50/60Hz,1Min FINISHED : 1.Varnish the complete assembly 2.Core is connected to primary ground (pin3) Primary 102T Bias/sense 16T Secondary 18T Anti-clockwise Copper foil 8.5(W)*8(L)mm shielding B(S)B(S) 2UEW 0.15mm*3*16T Bias clockwise 4.Transformer Design For 14V/350mA A(F) 1(S) -----Electric polarity 3(S) Instruction for Start of first winding… Winding machine rotation Winding Start Pin-1 & End Pin-2 in “Clockwise” direction - looking from Pin1/5 side of the Bobbin Pin1 Pin5 Primary Copper foil Connected to Pin3

iWatt Confidential – Do Not Copy 14V/350mA LED Driver15 Jan 2009 Page: 6 5. Bill of Material

iWatt Confidential – Do Not Copy 14V/350mA LED Driver15 Jan 2009 Page: 7 6. Regulation, Efficiency Measurement * Note: Output voltage measured at end of PCB.

iWatt Confidential – Do Not Copy 14V/350mA LED Driver15 Jan 2009 Page: 8 V IN =230V AC, T AMB =25 ℃ V IN =110V AC, T AMB =25 ℃ 7. Output VI Characteristics * Note: Output voltage measured at PCB end, T AMB =25 ℃

iWatt Confidential – Do Not Copy 14V/350mA LED Driver15 Jan 2009 Page: 9 8. V DS waveform Test Condition: V IN =264VAC, I out_cc =350mA Result: V DS_MAX =484V Remark: Mosfet Spec__2A 600V

iWatt Confidential – Do Not Copy 14V/350mA LED Driver15 Jan 2009 Page: 10 Neutral Peak Scan Live Peak Scan 9. Conducted EMI ( Input 230Vac Full Load is the worst case )

iWatt Confidential – Do Not Copy 14V/350mA LED Driver15 Jan 2009 Page: 11 Neutral AV Scan Live AV Scan 9. Conducted EMI ( Input 230Vac Full Load is the worst case )