1FEATURES

2• Two Independent PWM Current Mode

Controllers

• Integrated High Voltage Startup Regulator

• Compound 2.5A Main Output Gate Drivers

• Single Resistor Oscillator Setting to 2 MHz

• Synchronizable Oscillator

• Active Clamp Gate Driver for P-Channel

MOSFETs

• Adjustable Gate Drive Overlap Time

• 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 Under-Voltage Lockout under•

Independently Adjustable Soft-Start (Each

Regulator)

• Direct Interface with Opto-Coupler Transistor

• Thermal Shutdown

APPLICATIONS

• Telecommunication Power Converters

• Industrial Power Converters

• +42V Automotive Systems

DESCRIPTION

The LM5034 dual current mode PWM controller

contains all the features needed to control either two

independent forward/active clamp 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 LM5034 includes a startup

regulator that operates over a wide input range up to

100V and compound (bipolar + CMOS) gate drivers

that provide a robust 2.5A peak sink current. The

adjustable dead-time of the active clamp gate drivers

and adjustable maximum PWM duty cycle reduce

stress on the primary side MOSFET switches.

Additional features include programmable line under•

voltage lockout, cycle-by-cycle current limit, hiccup

mode fault operation with adjustable restart delay,

PWM slope compensation, soft-start, and a 2 MHz

capable oscillator with synchronization capability.

PACKAGE

• TSSOP-20