General Description

The MIC3832 and MIC3833 are unique PWM controllers designed for current-fed, multiple-output or push-pull, switched-mode power supply applications.

Features

• 15.9V startup, up to 21V operation (MIC3832)

8.3V startup, up to 21V operation (MIC3833)

• 9.8V undervoltage lockout (MIC3832)

7.8V undervoltage lockout (MIC3833)

• 0.5mA maximum startup current (40µA typical)

• 17mA typical operating current

• 50ns maximum rise and fall times

• 30kHz to 500kHz RC oscillator

• Voltage or current-mode control

• Cycle-by-cycle current limit

• Soft start function

• 5V 2 reference sources 20mA

• Totem-pole output drive stages 1A peak output drive current

• 22V zener clamp on supply pin

• PWM latch eliminates false outputs from noise or ringing

• Adjustable maximum duty-cycle limit

• 5MHz bandwidth error amplifier

Applications

• High-power, multiple-output, switched-mode power supplies and dc-to-dc Converters

• Current-fed, push-pull, switched-mode power supplies or dc-to-dc converters

• Isolated high-voltage supplies