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TYN256P データシート(PDF) 8 Page - Power Integrations, Inc. |
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TYN256P データシート(HTML) 8 Page - Power Integrations, Inc. |
8 / 20 page B 8/99 TNY256 8 Figure 13. Recommended PC Layout for TinySwitch without Under-Voltage Lock Out Resister. Layout Single Point Grounding Use a single point ground connection at the SOURCE pin for the BYPASS pin capacitor and the Input Filter Capacitor (see Figure 13). Primary Loop Area The area of the primary loop that connects the input filter capacitor, transformer primary and TinySwitch together, should be kept as small as possible. Primary Clamp Circuit A clamp or snubber circuit is used to minimize peak voltage and ringing on the DRAIN pin at turn-off. This can be achieved by using an RC snubber for less than 3 W or an RCD clamp as shown in Figure 13 for higher power. A Zener and diode clamp across the primary or a single 550V Zener clamp from DRAIN to SOURCE can also be used. In all cases care should be taken to minimize the circuit path from the snubber/clamp components to the transformer and TinySwitch. Thermal Considerations Copper underneath the TinySwitch acts not only as a single point ground, but also as a heatsink. The hatched area shown in Figure13 should be maximized for good heat-sinking of TinySwitch and output diode. EN/UV pin layout optimization The EN/UV pin connection to the opto-coupler should be kept to an absolute minimum (less than 0.5 in.), and this connection should be kept away from the DRAIN pin (minimum of 0.2 in.). These distance limitations are critical only in applications where an external under-voltage resistor (2 M Ω) is not used. Y-Capacitor The placement of the Y-capacitor should be directly from the primary single point ground to the common/return terminal on the secondary side. Such placement will maximize the EMI benefit of the Y-capacitor. Optocoupler It is important to maintain the minimum circuit path from the optocoupler transistor to the TinySwitch EN/UV and SOURCE pins to minimize noise coupling. 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. See Figure13 for optimized layout. In addition, sufficient copper area should be provided at the anode and cathode terminals of the diode to adequately heatsink the diode under output short circuit conditions. Input and Output Filter Capacitors There are constrictions in the traces connected to the input and output filter capacitors. These constrictions are present for two reasons. The first is to force all the high frequency currents to flow through the capacitor (if the trace were wide then it could flow around the capacitor). Secondly, the constrictions minimize the heat transferred from the TinySwitch to the input filter capacitor and from the secondary diode to the output filter capacitor. The common/return (the negative output terminal in Figure13) terminal of the output filter capacitor should be connected with a short, low resistance path to the secondary winding. In addition, the common/return output connection should be taken directly from the secondary winding pin and not from the Y-capacitor connection point. TOP VIEW PI-2360-012199 Y1- Capacitor Opto- coupler CBP D EN/UV BP TinySwitch + – HV + – DC Out Input Filter Capacitor Output Filter Capacitor Safety Spacing Transformer Maximize hatched copper areas ( ) for optimum heat sinking S S PRI SEC |
同様の部品番号 - TYN256P |
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同様の説明 - TYN256P |
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