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HV9922N3-G Datasheet(PDF) 7 Page - Supertex, Inc |
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HV9922N3-G Datasheet(HTML) 7 Page - Supertex, Inc |
7 / 10 page 7 NR092005 HV9921/HV9922/HV9923 Select L1 68mH, I=30mA. Typical SRF=170KHz. Calculate the coil capacitance. Step 2. Selecting D1 Usually, the reverse recovery characteristics of ultra- fast rectifiers at I F=20~50mA are not provided in the manufacturer’s data books. The designer may want to experiment with different diodes to achieve the best result. Select D1 MUR160 with V R = 600V, trr ≈ 20ns (I F=20mA, I RR=100mA) and CJ ≈ 8pF (VF>50V). Step 3. Calculating total parasitic capacitance using (3) Step 4. Calculating the leading edge spike duration using (4), (5) Step 5. Estimating power dissipation in HV9921 at 264VAC using (8) and (10) Let us assume that the overall efficiency η = 0.7. Switching power loss: P SWITCH ≈ 120mW Minimum duty ratio: Conduction power loss: Total power dissipation in HV9921: Step 6. Selecting input capacitor C IN Select C IN ECQ-E4104KF by Panasonic (0.1 µF, 400V, Metalized Polyester Film). () ( ) L 22 11 C13 pF L1 2 SRF 68mH 2 170KHz ππ == ≈ ⋅⋅ ⋅⋅ P C 5 pF 5 pF 13 pF 8 pF 31pF =+ + + = () SPIKE BLANK MIN 264V 2 31pF T 20ns 136ns T 100mA ⋅⋅ =+ ≈ < () .. SWITCH 141V P 264V 31pF 2 100mA 20ns 264V 210 5 s 07 µ ⎛⎞ ≈⋅ + ⋅ ⋅ − ⎜⎟ ⋅ ⎝⎠ /( . ) . m D 41V 07 264V 2 0 16 =⋅ ⋅ ≈ () .. 2 COND P 0 25 20mA 210 0 63 200 A 264V 55mW Ωµ =⋅ ⋅ + ⋅ ⋅ ≈ TOTAL P 120mW 55mW 175mW =+ = Output Power 41V 20mA 820mW =⋅ = Figure 2. Universal 85-264VAC LED Lamp Driver C IN AC Line 85-264V C DD 1 3 2 HV9921/22/23 D1 L1 LED 1 -LED12 D2 U1 D3 D4 D5 C IN2 L IN VRD1 F1 C O VDD DRAIN GND |
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