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## FC9921 Datasheet(PDF) 6 Page - First Silicon Co., Ltd

 No. de Pieza. FC9921 Descripción 3-Pin Switch-Mode LED Lamp Driver IC Descarga 8 Pages Scroll/Zoom 100% Fabricante FS [First Silicon Co., Ltd] Página de inicio http://www.firstsilicon.co.kr/ Logo

## FC9921 Datasheet(HTML) 6 Page - First Silicon Co., Ltd

 6 / 8 page FC99212012. 10. 316/8Revision No : 0Step 1. Calculating L1.The output voltage VO = 10 x VF ≈ 41V (max.). Use equation(1) assuming a 30% peak-to-peak ripple.L1 = (41V • 10.5µs) / (0.3 • 20mA) = 72mHSelect L1 68mH, I = 30mA. Typical SRF = 170KHz. Calculatethe coil capacitance.CL =1L1 • (2π • SRF)2=168mH• (2π • 170kHz)2≈ 13pFStep 2. Selecting D1Usually, the reverse recovery characteristics of ultra-F = 20 ~ 50mA are not provided in themanufacturer’s data books. The designer may want toexperiment with different diodes to achieve the best result.Select D1 MUR160 with VR = 600V, trr ≈ 20ns (IF = 20mA, IRR= 100mA) and CJ ≈ 8pF (VF > 50V).Step 3. Calculating total parasitic capacitance using (3)CP = 5pF + 5pF + 13pF + 8pF = 31pfStep 4. Calculating the leading edge spike duration using(4), (5)TSPIKE =265V • √2 • 31pF+ 20ns100mA≈ 136ns < TBLANK(MIN)Step 5. Estimating power dissipation in FC9921 at 265VACusing (8) and (10)Switching power loss:PSWITCH =1(265V • 31pF + 2 • 100mA• 20ns)(265V - 41V)2 • 10.5µs0.7PSWITCH ≈ 65mWMinimum duty ratio:DM = 41V / (0.7 • 265V • √2) ≈ 0.16Conduction power loss:PCOND = 0.25 • (20mA)2• 210Ω + 0.63 • 200µA• 265VPCOND ≈ 55mWTotal power dissipation in FC9921:PTOTAL = 120mW + 55mW = 175mWStep 6. Selecting input capacitor CNOutput Power = 41V • 20mA = 820mWSelect CIN ECQ-E4104KF by Panasonic (0.1µF, 400V,Metalized Polyester Film).Figure 2. Universal 85-265VAC LED Lamp DriverCINAC Line85-265VCDD3FC9921D1L1LED1 - LED12D2U1D3D4D5CIN2LINVRD1F1COVDDDRAINGND12