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## FC9920 Datasheet(PDF) 5 Page - First Silicon Co., Ltd

 No. de Pieza. FC9920 Descripción 3-Pin Switch-Mode LED Lamp Driver Descarga 7 Pages Scroll/Zoom 100% Fabricante FS [First Silicon Co., Ltd] Página de inicio http://www.firstsilicon.co.kr/ Logo

## FC9920 Datasheet(HTML) 5 Page - First Silicon Co., Ltd

 5 / 7 page FC99202012. 10. 315/7Revision No : 0L1 = (60V · 10.5µs) / (0.3 · 100mA) = 21mHSelect L1 = 22mH, I = 150mA. Typical SRF =270KHz. Calculate the coil capacitance.CL = 1/[L1· (2π · SRF)2] = 1 / [22mH · (2π ·270KHz)2] ≈ 15pFStep 2. Selecting D1.Select D1 MUR160 with VR = 600V,trr ≈ 50nsand CJ ≈ 8pF (VR>50V).Step 3. Calculating total parasitic capacitanceusing (3).CP = 5pF + 5pF + 15pF + 8pF = 33pFStep 4. Calculating the leading edge spike durationusing (4), (5).TSPIKE = (135V · √2 · 33pF) / 150mA + 50ns ≈92ns < TBLANK(MIN)=200nsStep 5. Estimating power dissipation in An9920 at135VAC using (8) and (10).Let us assume that the overall efficiency η = 0.7.Switching Power LossPSWITCH = (135V · 33pF + 2 · 150mA · 50ns) ·(135V – 60V/0.7) / (2 · 10.5µs) ≈ 46mWMinimum Duty RatioDM = 60V / (0.7 · 135V · √2) ≈ 0.45Conduction Power LossPCOND = 0.42 · (100mA)2· 100Ω + 0.57 · 20 0µA ·135V ≈ 435mWTotal Power Dissipation in An9920:PTOTAL = 46mW + 435mW = 481mWStep 6. Selecting input capacitor CINOutput Power = 60V · 100mA = 6WSelect CIN = 0.68µF, 250V1N4007*410nF250V33nF250V0.68µF250VCINLED1-LED24COL1LINCIN2AC Line85-135VF1VRD1CDDVDDGNDDRAINFC9920D1U1132D2U1D4D3U1D5U1Figure 2. Universal 85 - 135VAC LED Lamp Driver22mH150mA2.2mH150mAMUR160600VVF=2.5V0.1µF50V