LOGIC

OSC

VIN

VCC

CS

0.5V

0.625V

LOGIC

OUT1

OUT2

GND

7.7V SERIES

REGULATOR

GENERATOR

REFERENCE

SLOPECOMP RAMP

GENERATOR

DRIVER

DRIVER

PWM

Rt / SYNC

45PA

0

CLK

SS

VCC

VCC

SHUTDOWN

COMPARATOR

ENABLE

ENABLE

2k

5V

1.25V

ERROR AMP

SOFT START 10PA

0.45V

VFB

5k

5V

1.4V

100k

50k

COMP

1.25V

SS

+

-

+

-

+

-

+

-

CLK

CLR

SET

J

Q

K

Q

CLR

SET

S

Q

R

Q

LM5030

SNVS215D – APRIL 2003 – REVISED NOVEMBER 2015

www.ti.com

7 Detailed Description

7.1 Overview

The LM5030 high-voltage PWM controller contains all of the features needed to implement push-pull and bridge

topologies, using current-mode control in a small 10-pin package. Features included are, start-up regulator, dual

mode current limit, dual alternating gate drivers, thermal shutdown, softstart, and slope compensation. This high

speed IC has total propagation delays < 100 ns. The functional block diagram of the LM5030 is shown in

Functional Block Diagram.

The LM5030 is designed for current-mode control converters that require alternating outputs, such as push-pull

and half- and full-bridge topologies. The features included in the LM5030 enable all of the advantages of current-

mode control, line feed-forward, cycle-by-cycle current limit, and simplified loop compensation. The oscillator

ramp is internally buffered and added to the PWM comparator input to provide the necessary slope

compensation for current-mode control at higher duty cycles.

7.2 Functional Block Diagram

10

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