Description

The IC products in this series are primary control switching regulator control IC’s appropriate for obtaining

stabilized DC voltages from commercial AC power.

Features

• Operating frequencies up to a high 600 kHz

• Built-in pre-driver circuit for driving power MOS FET

• Built-in timer latch over-current protection function (HA16107)

• The OCL enables intermittent operation by an ON/OFF timer for prevention of secondary overcurrent.

(HA16108)

• The UVL function (under voltage lockout) is applied to both Vin and Vref.

• ON/OFF reset: an auto-reset function which is based on the time constant of an external capacitor and

observation of drops in Vin.

• Since the over-voltage protection function OVP (the TL pin) only observes voltage drops in Vin, it is

possible to use the OVP and ON/OFF pin for independent purposes.

• Built-in 34 V Zener diode between Vin and ground.

Functions

• 6.45 V reference voltage

• Triangle wave generator

• Error amplifier

• Under voltage lockout protector

• PWM comparator

• Pulse-by-pulse current limitting

• Timer-latch current limitting (HA16107)

• ON/OFF timer function (HA16108)

• Soft start and quick shutdown

• Output circuit for power MOS FET driving