AN3339 datasheet(8/44 Pages) STMICROELECTRONICS

Part #	AN3339

Description	185 W power supply with PFC and standby supply for LED TV

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Main characteristics and circuit description

AN3339

8/44

Doc ID 18449 Rev 2

also turns on. These two transistors form an SCR structure that shorts to ground the anode

of the U5 optocoupler in case of an overvoltage event. In this way, Q7 cannot deliver supply

voltage Vcc to the controller which remains latched until the mains voltage is recycled.

To protect the PFC and LLC controllers from being powered with an abnormal voltage,

which may occur in the case of a failure of the regulator based on Q7, an overvoltage

protection is provided by the Zener diode D13. In the case of the Q7 regulator providing an

excessive output voltage, D13 is reverse-biased and latches the L6599A through the DIS pin

(#8).

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