Low Power Primary Switcher for Off Line SMPS

The HT7A6312 is highly functionally integrated device which combines an integrated PWM controller with current mode control and a high voltage power MOSFET on the same silicon chip.

Features:

• fixed 60kHz switching frequency
• 9V to 38V wide range VCC voltage
• wide AC input range from 85VAC to 265VAC
• PWM with current mode control
• auxiliary Under Voltage Lock Out with hysteresis
• high voltage start-up current source
• excellent standby low power consumption
• over-temperature, Over-current and Over-voltage protection with auto-restart
• integrated 730V MOSFET
• burst mode under low load conditions

Specification:

• topology: flyback (SSR), buck, buck-boost
• PF: <0.9
• standbay power: <100mW
• max. output power (110VAC/220VAC): 8W / 13W
• power MOSFET maximum voltage: 730V
• protection: OVP, OCP, In-OTP
• case: 8DIP