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TNY280PTL Datasheet(PDF) 11 Page - Power Integrations, Inc. |
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TNY280PTL Datasheet(HTML) 11 Page - Power Integrations, Inc. |
11 / 24 page 11 TNY274-280 E 2/06 Thermal Considerations The four SOURCE pins are internally connected to the IC lead frameandprovidethemainpathtoremoveheatfromthedevice. ThereforealltheSOURCEpinsshouldbeconnectedtoacopper area underneath the TinySwitch-III to act not only as a single point ground, but also as a heatsink. As this area is connected to the quiet source node, this area should be maximized for good heatsinking. Similarly for axial output diodes, maximize the PCB area connected to the cathode. 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 TinySwitch-III device. Note – if an input π (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. Optocoupler Place the optocoupler physically close to the TinySwitch-III to minimizing the primary-side trace lengths. Keep the high current, high voltage drain and clamp traces away from the optocoupler to prevent noise pick up. Output Diode For best performance, the area of the loop connecting the secondary winding, the output diode and the output filter capacitor, should be minimized. In addition, sufficient copper area should be provided at the anode and cathode terminals 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. Figure 15. Recommended Circuit Board Layout for TinySwitch-III with Under-Voltage Lock Out Resistor. + DC OUT - + - HV DC INPUT Input Filter Capacitor Output Filter Capacitor PI-4278-013006 TOP VIEW Maximize hatched copper areas ( ) for optimum heatsinking D BP/M EN/UV S S S S Y1- Capacitor Opto- coupler CBP T r a n s f o r m e r TinySwitch-III |
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