Patent ID: 9401660
Filing Date: 2016-07-26
CPC Classification: H02M

Claim Text:
1. An integrated circuit (IC) comprising: a regulator circuit coupled to, receive an ac source line voltage of between 85 to 265 V AC across first and second input terminals and output a regulated do supply voltage across first and a second output terminals, the regulator circuit including first and second high-voltage switching elements that selectively provide charging current when enabled, the first and second high-voltage switching elements capable of supporting a voltage difference between the ac line voltage and the regulated do supply voltage, the first high-voltage switching element including: and further wherein the second high-voltage switching element includes: a sensor circuit coupled to sense the regulated do supply voltage and generate a feedback signal to control the first and second high-voltage switching elements, wherein the feedback signal turns off the first and second high-voltage switching elements when the regulated do voltage is above a target voltage, and turns on the first and second high-voltage switching elements when the regulated dc voltage is below the target voltage, the sensor circuit further including a supply capacitor coupled between the first and second output terminals; and first and second body diodes each having an anode coupled to the second output terminal, a cathode of the first body diode being coupled to the second input terminal and the cathode of the second body diode being coupled to the first input terminal, the cathode of the first body diode comprising a common well region shared by the second MOSFET and second JFET, the cathode of the second body diode comprising a common well region shared by the first MOSFET and first JFET, a charging current of the supply capacitor alternately flowing through the first body diode when the first high-voltage switching element is turned on and through the second body diode when the second high-voltage switching element is turned on.