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LNK364P Datasheet(PDF) 6 Page - Power Integrations, Inc. |
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LNK364P Datasheet(HTML) 6 Page - Power Integrations, Inc. |
6 / 16 page LNK362-364 B 11/05 6 LinkSwitch-XT Layout Considerations See Figure 6 for a recommended circuit board layout for LinkSwitch-XT . Single Point Grounding Use a single point ground connection from the input filter capacitor to the area of copper connected to the SOURCE pins. Bypass Capacitor C BP TheBYPASSpincapacitorshouldbelocatedasnearaspossible to the BYPASS and SOURCE pins. Primary Loop Area The area of the primary loop that connects the input filter capacitor, transformer primary and LinkSwitch-XT together should be kept as small as possible. Primary Clamp Circuit Aclamp is used to limit peak voltage on the DRAIN pin at turn off. This can be achieved by using an RCD clamp or a Zener (~200 V) and diode clamp across the primary winding. In all cases, to minimize EMI, care should be taken to minimize the circuit path from the clamp components to the transformer and LinkSwitch-XT . Thermal Considerations The copper area underneath the LinkSwitch-XT acts not only as a single point ground, but also as a heatsink. As this area is connected to the quiet source node, it should be maximized for good heat sinking of LinkSwitch-XT. The same applies to the cathode of the output diode. Y Capacitor The placement of the Y capacitor should be directly from the primary input filter capacitor positive terminal to the common/return terminal of the transformer secondary. Such a placement will route high magnitude common-mode surge currents away from the LinkSwitch-XT device. Note that if an input pi (C, L, C) EMI filter is used, then the inductor in the filter should be placed between the negative terminals of the input filter capacitors. Figure 6. Recommended Printed Circuit Layout for LinkSwitch-XT in a Flyback Converter Configuration. + + HV DC INPUT - - DC OUT TOP VIEW PI-4155-102705 T r a n s f o r m e r Input Filter Capacitor CBP Output Filter Capacitor D S S FB BP S S Maximize hatched copper areas ( ) for optimum heatsinking S S Opto- coupler Y1- Capacitor |
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