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LNK354G Datasheet(PDF) 6 Page - Power Integrations, Inc. |
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LNK354G Datasheet(HTML) 6 Page - Power Integrations, Inc. |
6 / 16 page LNK353/354 F 2/05 6 of the diode for heatsinking. A larger area is preferred at the quiet cathode terminal. A large anode area can increase high frequency radiated EMI. Quick Design Checklist As with any power supply design, all LinkSwitch-HF designs should be verified on the bench to make sure that component specificationsarenotexceededunderworst-caseconditions.The following minimum set of tests is strongly recommended: 1. Maximum drain voltage – Verify that V DS does not exceed 675Vatthehighestinputvoltageandpeak(overload)output power. 2. Maximumdraincurrent–Atmaximumambienttemperature, maximum input voltage and peak output (overload) power, verify drain current waveforms for any signs of transformer saturation and excessive leading edge current spikes at startup. Repeat under steady state conditions and verify that Figure 6. Recommended Printed Circuit Layout for LinkSwitch-HF in a Flyback Converter Configuration. the leading edge current spike event is below I LIMIT(MIN)at the end of the t LEB(MIN). Under all conditions, the maximum drain current should be below the specified absolute maximum ratings. 3. Thermal Check – At specified maximum output power, minimuminputvoltageandmaximumambienttemperature, verify that the temperature specifications are not exceeded for LinkSwitch-HF, transformer, output diode, and output capacitors. Enough thermal margin should be allowed for part-to-part variation of the R DS(ON) of LinkSwitch-HF as specifiedinthedatasheet.Underlowline,maximumpower, a maximum LinkSwitch-HF SOURCE pin temperature of 100 °C is recommended to allow for these variations. Design Tools Up-to-date information on design tools can be found at the Power Integrations website: www.powerint.com. + HV DC Input PI-3890-102704 Input Filter Capacitor CBP - DC Out Output Filter Capacitor Y1- Capacitor Maximize hatched copper areas ( ) for optimum heatsinking TOP VIEW D S S BP FB S S LinkSwitch-HF + - Opto- coupler PRI SEC T r a n s f o r m e r |
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