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LNK614DG-TL Datasheet(PDF) 7 Page - Power Integrations, Inc. |
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LNK614DG-TL Datasheet(HTML) 7 Page - Power Integrations, Inc. |
7 / 18 page Rev. F 01/10 7 LNK603-606/613-616 www.powerint.com An overshoot is acceptable Negative ring may increase output ripple and/or degrade output regulation Figure 6. Desired Drain Voltage Waveform with Minimal Leakage Ringing Undershoot. Figure 7. Undesirable Drain Voltage Waveform with Large Leakage Ring Undershoot. BYPASS pin voltage. The parameters I S2 and VBP are provided in the parameter table of the LinkSwitch-II data sheet. Diode D6 can be any low cost diode such as FR102, 1N4148 or BAV19/20/21. Quick Design Checklist As with any power supply design, all LinkSwitch-II designs should be verified on the bench to make sure that component specifications are not exceeded under worst-case conditions. The following minimum set of tests is strongly recommended: 1. Maximum drain voltage – Verify that peak V DS does not exceed 680 V at the highest input voltage and maximum output power. 2. Maximum drain current – At maximum ambient temperature, maximum input voltage and maximum output load, verify drain current waveforms at start-up for any signs of trans- PI-5116-050808 D S FB BP R2 470 k Ω 1 k Ω R3 300 Ω R5 13 k Ω 1% R6 9.31 k Ω 1% D5 1N4007 D7 SL13 TI EE13 5 10 8 2 4 NC 3 C7 470 µF 10 V C1 4.7 µF 400 V C2 4.7 µF 400 V C4 1 µF 50 V L1 1 mH C3 820 pF 1 kV AC Input DC Output U1 LNK613DG LinkSwitch-II RF1 8.2 Ω 2 W D1 1N4007 D2 1N4007 D3 1N4007 D4 1N4007 former saturation and excessive leading edge current spikes. LinkSwitch-II has a leading edge blanking time of 170 ns to prevent premature termination of the ON-cycle. 3. Thermal check – At maximum output power, both minimum and maximum input voltage and maximum ambient tempera- ture; verify that temperature specifications are not exceeded for LinkSwitch-II, transformer, output diodes and output capacitors. Enough thermal margin should be allowed for part-to-part variation of the R DS(ON) of LinkSwitch-II, as specified in the data sheet. To assure 10% CC tolerance a maximum SOURCE pin temperature of 90 ºC is recommended. Design Tools Up-to-date information on design tools can be found at the Power Integrations web site: www.powerint.com Figure 8. LinkSwitch-II Flyback Power Supply Without Bias Supply. |
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