Description

The IC products in this series are primary control switchingregulator 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