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TOP209 Datasheet(PDF) 8 Page - Power Integrations, Inc. |
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TOP209 Datasheet(HTML) 8 Page - Power Integrations, Inc. |
8 / 16 page A 8/97 8 TOP209/210 2 Figure 9. Recommended PC Layout for the TOP209/210. CONTROL SOURCE SOURCE DRAIN TOP VIEW PI-1744-011796 High Voltage Return Bias/Feedback Return Bypass Capacitor Bias/Feedback Input TOP210 PFI Use a Kelvin connection to the SOURCE pin for the CONTROL pin bypass capacitor as shown in Figure 9. Minimize peak voltage and ringing on the DRAIN voltage at turn-off. Use a Zener or TVS Zener diode to clamp the DRAIN voltage. Under some conditions, externally provided bias or supply current driven into the CONTROL pin can hold the TOPSwitch in one of the 8 auto-restart cycles indefinitely and prevent starting. Shorting the CONTROL pin to the SOURCE pin will reset the TOPSwitch. To avoid this problem when doing bench evaluations, it is recommended that the V C power supply be turned on before the DRAIN voltage is applied. Key Application Considerations CONTROL pin currents during auto-restart operation are much lower at low input voltages (< 20 V) which increases the auto- restart cycle period (see the I C vs. Drain Voltage Characteristic curve). Short interruptions of AC power may cause TOPSwitch to enter the 8-count auto-restart cycle before starting again. This is because the input energy storage capacitors are not completely discharged and the CONTROL pin capacitance has not discharged below the internal power-up reset voltage (V C(RESET)). In some cases, minimum loading may be necessary to keep a lightly loaded or unloaded output voltage within the desired range due to the minimum ON-time. For additional applications information regarding the TOPSwitch family, refer to AN-14 in the 1996-97 Data Book and Design Guide or on our Web site. |
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