| 摘要 |
AC/DC power converters having an under voltage lockout circuit with first and second thresholds and associated methods of operation are disclosed herein. In one embodiment, the first threshold is greater than the second threshold. The under voltage lockout circuit is configured to enable a current source to charge the capacitor when the voltage across the capacitor is less than the second threshold. The under voltage lockout circuit is configured to shut off the current source and to enable a pulse width modulator circuit to switch a transistor when the voltage is greater than the first threshold.
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