LM5032 datasheet(2/22 Pages) NSC

2 / 22 page

Connection Diagram

Top View

20135002

16-Lead TSSOP

Ordering Information

Order Number

Package Type

NSC Package Drawing

Supplied As

LM5032MTC

TSSOP-16

MTC-16

92 Units per Rail

LM5032MTCX

TSSOP-16

MTC-16

2500 Units on Tape and Reel

Pin Description

NAME

DESCRIPTION

APPLICATIONS INFORMATION

VIN

Input Supply

Input to the startup regulator. The operating input range is 13V to

100V with transient capability to 105V.

COMP1

PWM Control, Controller 1

The COMP1 input provides voltage feedback to the PWM comparator

inverting input of Controller 1 through a 3:1 divider. The OUT1 duty

cycle increases as the COMP1 voltage increases. An internal 5K

Ω

pull-up resistor to +5.0V provides bias current to an opto-coupler

transistor.

CS1

Current Sense Input, Controller 1

Input for current mode control and the current limit sensing. If the CS1

pin exceeds 0.5V the OUT1 pulse is terminated producing

cycle-by-cycle current limiting. External resistance connected to CS1

will adjust (increase) PWM slope compensation. This pin’s voltage

must not exceed 1.25V.

SS1

Soft-start, Controller 1

An internal 50 µA current source charges an external capacitor to set

the soft-start rate. During a current limit restart sequence, the internal

current source is reduced to 1 µA to increase the delay before retry.

Forcing SS1 below 0.5V shuts off Controller 1.

UVLO

VIN Under-Voltage Lockout

An external resistor divider sets the input voltage threshold to enable

the LM5032. The UVLO comparator reference voltage is 1.25V. A

switched 20 µA current source provides adjustable UVLO hysteresis.

The UVLO pin voltage also controls the maximum duty cycle as

described in the Functional Description section.

VCC

Start-up regulator output

Output of the 7.7V high voltage start-up regulator. Current limit is a

minimum of 19 mA.

OUT1

Main Gate Driver, Controller 1

Gate driver output to the primary side switch for Controller 1. OUT1

swings between VCC and GND1 at a frequency equal to half the

oscillator frequency.

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