■ Description

The FA7610CP(N), 7612CP(N) and 7617CP(N) are bipolar ICs containing basic circuits necessary for PWM-type switching power supply control.

To minimize the number of external discrete components, the FA7610CP(N) is provided for a flyback or step-up power supply circuit, the FA7612CP(N) for a step-down power-supply circuit and FA7617CP(N) for a flyback power supply circuit.

■ Features

FA7610CP(N)

• For flyback transformer-type or step-up power-supply circuit (maximum output duty = 64% typical)

• Totem-pole predriver

• PWM-type switching power supply control

• Low-voltage operation (VCC = 3.6 to 22V)

• Latch-mode short-circuit protection function (no malfunction by noise)

• Soft-start function

• Undervoltage lockout function

• One capacitor shared for short circuit protection and for soft start to minimize the number of external discrete components

FA7612CP(N)

• For step-down power-supply circuit (maximum output duty = up to 100%)

• Open collector output

• PWM-type switching power supply control

• Low-voltage operation (VCC = 3.6 to 22V)

• Latch-mode short-circuit protection function (no malfunction by noise)

• Soft-start function

• Undervoltage lockout function

• One capacitor shared for short circuit protection and for soft start to minimize the number of external discrete components

FA7617CP(N)

• For flyback transformer-type power-supply circuit (maximum output duty = 67% typical)

• Open collector output

• PWM-type switching power supply control

• Low-voltage operation (VCC = 3.6 to 22V)

• Latch-mode short-circuit protection function (no malfunction by noise)

• Soft-start function

• Undervoltage lockout function

• One capacitor shared for short circuit protection and for soft start to minimize the number of external discrete components

■ Applications

• Battery power supply for portable equipment