LM5033MM datasheet(2/17 Pages) NSC

2 / 17 page

Pin Description

NAME

DESCRIPTION

APPLICATION INFORMATION

Vin

Input Voltage

Input to the start-up regulator. Input range is 15V to

90V, with transient capability to 100V .

REF

2.5V precision reference output

Sink only, requires an external pull-up resistor. This

can be used as a reference for external circuitry.

COMP

PWM Input

Feedback to the PWM comparator’s inverting input,

through a 3:1 divider. The output duty cycle increases

as this pin’s voltage increases. Internally there is a

Ω pullup to +5.2V.

VCC

9.6V output from the internal high voltage series

pass regulator

An external voltage (10V - 15V) can be applied to this

pin to shutdown the internal regulator, thereby

reducing internal dissipation. An internal diode

connects Vcc to Vin.

OUT1

Gate Driver Output #1

Alternating output gate driver, which can source and

sink 1.5A.

OUT2

Gate Driver Output #2

Alternating output gate driver, which can source and

sink 1.5A.

GND

Ground pin for all internal circuitry

Connections to external ground must be done with

care for optimum performance. See the Functional

Description and Applications Section for more

information.

Current sense input

Current sense input for the current limit detection. If

CS exceeds 0.5V the outputs are disabled and the

softstart pin is discharged to ground.

T/ SYNC

Oscillator timing resistor pin and synchronization

input

An external resistor to ground sets the oscillator

frequency. This pin will also accept ac-coupled

synchronization pulses from an external source.

Softstart pin

An internal 10µA current source and an external

capacitor set the soft-start timing. This pin can be

externally pulled to below 0.5V to disable the output

drivers.

LLP

DAP

SUB

Die Substrate

The exposed die attach pad on the LLP package

should be connected to a PCB thermal pad at ground

potential. For additional information on using National

Semiconductor’s No Pull Back LLP package, please

refer to LLP Application Note AN-1187.

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