1 Features

1• Two Independent PWM Current Mode Controllers

• Integrated High-Voltage Startup Regulator

• Compound 2.5-A Main Output Gate Drivers

• Single Resistor Oscillator Setting to 2 MHz

• Synchronizable Oscillator

• Programmable Maximum Duty Cycle

• Maximum Duty Cycle Fold-Back at High-Line

Voltage

• Adjustable Timer for Hiccup Mode Current

Limiting

• Integrated Slope Compensation

• Adjustable Line Undervoltage Lockout

• Independently Adjustable Soft-Start (Each

Regulator)

• Direct Interface with Opto-Coupler Transistor

• Thermal Shutdown

• TSSOP 16-Pin Package

2 Applications

• Telecommunication Power Converters

• Industrial Power Converters

• 42-V Automotive Systems

3 Description

The LM5032 dual current mode PWM controller

contains all the features needed to control either two independent forward dc/dc converters or a single high

current converter comprised of two interleaved power

stages. The two controller channels operate 180° out

of phase thereby reducing input ripple current. The LM5032 includes a startup regulator that operates

over a wide input range up to 100 V and compound

(bipolar + CMOS) gate drivers that provide a robust

2.5-A peak sink current. The adjustable maximum

PWM duty cycle reduce stress on the primary side

MOSFET switches. Additional features include programmable line undervoltage lockout, cycle-by-

cycle current limit, hiccup mode fault operation with

adjustable response time, PWM slope compensation,

soft-start, and a 2-MHz capable oscillator with

synchronization capability.