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FC9920 Datasheet(PDF) 5 Page - First Silicon Co., Ltd |
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FC9920 Datasheet(HTML) 5 Page - First Silicon Co., Ltd |
5 / 7 page FC9920 2012. 10. 31 5/7 Revision No : 0 L1 = (60V · 10.5µs) / (0.3 · 100mA) = 21mH Select L1 = 22mH, I = 150mA. Typical SRF = 270KHz. Calculate the coil capacitance. CL = 1/[L1· (2π · SRF)2] = 1 / [22mH · (2π · 270KHz)2] ≈ 15pF Step 2. Selecting D1. Select D1 MUR160 with VR = 600V, trr ≈ 50ns and CJ ≈ 8pF (VR>50V). Step 3. Calculating total parasitic capacitance using (3). CP = 5pF + 5pF + 15pF + 8pF = 33pF Step 4. Calculating the leading edge spike duration using (4), (5). TSPIKE = (135V · √2 · 33pF) / 150mA + 50ns ≈ 92ns < TBLANK(MIN)=200ns Step 5. Estimating power dissipation in An9920 at 135VAC using (8) and (10). Let us assume that the overall efficiency η = 0.7. Switching Power Loss PSWITCH = (135V · 33pF + 2 · 150mA · 50ns) · (135V – 60V/0.7) / (2 · 10.5µs) ≈ 46mW Minimum Duty Ratio DM = 60V / (0.7 · 135V · √2) ≈ 0.45 Conduction Power Loss PCOND = 0.42 · (100mA) 2· 100Ω + 0.57 · 2 0 0µA · 135V ≈ 435 mW Total Power Dissipation in An9920: PTOTAL = 46mW + 435mW = 481mW Step 6. Selecting input capacitor CIN Output Power = 60V · 100mA = 6W Select CIN = 0.68µF, 250V 1N4007*4 10nF 250V 33nF 250V 0.68µF 250V CIN LED1-LED24 CO L1 LIN CIN2 AC Line 85-135V F1 VRD1 CDD VDD GND DRAIN FC9920 D1 U1 1 3 2 D2 U1 D4 D3 U1 D5 U1 Figure 2. Universal 85 - 135VAC LED Lamp Driver 22mH 150mA 2.2mH 150mA MUR 160 600V VF=2.5V 0.1µF 50V |
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Descripción similar - FC9920 |
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