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FC9922 Datasheet(PDF) 6 Page - First Silicon Co., Ltd |
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FC9922 Datasheet(HTML) 6 Page - First Silicon Co., Ltd |
6 / 8 page FC9922 2012. 10. 31 6/8 Revision No : 0 Step 1. Calculating L1. The output voltage V O = 12 x VF = 30V (max.). Use equation (1) assuming a 30% peak-to-peak ripple. L1 = (30V • 10.5µs) / (0.3 • 50mA) = 21mH Select L1 22mH, I = 60mA. Typical SRF = 270KHz. Calculate the coil capacitance. C L = 1 L1 • (2π • SRF)2 = 1 22mH • (2π • 270kHz)2 ≈ 15pF Step 2. Selecting D1 Select D1 MUR160 with V R = 600V, trr ≈ 50ns and CJ ≈ 8pF (V F > 50V). Step 3. Calculating total parasitic capacitance using (3) C P = 5pF + 5pF + 15pF + 8pF = 33pf Step 4. Calculating the leading edge spike duration using (4), (5) T SPIKE = 135V • √2 • 33pF + 50ns 100mA ≈ 113ns < T BLANK(MIN) Step 5. Estimating power dissipation in FC9922 at 135VAC using (8) and (10) Switching power loss: P SWITCH = 1 (135V • 33pF + 2 • 100mA• 20ns)(135V - 30V) 2 • 10.5µs 0.7 P SWITCH ≈ 65mW Minimum duty ratio: D M = 30V / (0.7 • 135V • √2) ≈ 0.23 Conduction power loss: P COND = 32 • (50mA) 2 • 200Ω + 0.62 • 200µA • 135V P COND ≈ 175mW Total power dissipation in FC9922: P TOTAL = 65mW + 175mW = 240mW Step 6. Selecting input capacitor C N Output Power = 30V • 50mA = 1.5W Select C N 0.22µF, 250V. Figure 2. Universal 85-265VAC LED Lamp Driver C IN AC Line 85-265V C DD 3 FC9922 D1 L1 LED 1 - LED12 D2 U1 D3 D4 D5 C IN2 L IN VRD1 F1 C O VDD DRAIN GND 1 2 |
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