LM5030

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SNVS215B – MAY 2004 – REVISED MARCH 2005

PIN DESCRIPTION

Pin Name

Pin

Description

Application Information

Number

1

Source Input Voltage

Input to start-up regulator. Input range 14 to 100 Volts.

2

Inverting input to the error amplifier

The non-inverting input is internally connected to a 1.25 Volt reference.

COMP

3

Output to the error amplifier

There is an internal 5K resistor pull-up on this pin. The error amplifier

provides an active sink.

Vcc

4

Output from the internal high voltage

If an auxiliary winding raises the voltage on this pin above the

series pass regulator. The regulation

regulation setpoint the internal series pass regulator will shutdown,

setpoint is 7.7 Volts.

reducing the IC power dissipation.

OUT1

5

Output of the PWM controller

Alternating PWM output gate driver.

OUT2

6

Output of the PWM controller

Alternating PWM output gate driver.

GND

7

Return

Ground

CS

8

Current sense input

Current sense input for current mode control and current limit sensing.

Using separate dedicated comparators, if CS exceeds 0.5 Volt the

outputs will go into Cycle by Cycle current limit. If CS exceeds 0.625V

the outputs will be disabled and a softstart commenced.

RT

9

Oscillator timing resistor pin and

An external resistor sets the oscillator frequency. This pin will also

synchronization input.

accept synchronization pulses from an external oscillator.

SS

10

Dual purpose Softstart and Shutdown

A 10µA current source and an external capacitor set the softstart timing

pin

length. The controller will enter a low power state if the SS pin is pulled

below the typical shutdown threshold of 0.45V.

WSON

SUB

Die Substrtae

The exposed die attach pad on the WSON package should be

DAP

connected to a PCB thermal pad at ground potential. For additional

information on using TI's No Pull Back WSON package, please refer to

WSON Application Note AN-1187.

Copyright © 2004–2005, Texas Instruments Incorporated

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