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