TL598

PULSEWIDTHMODULATION CONTROL CIRCUITS

SLVS053D − FEBRUARY 1988 − REVISED NOVEMBER 2003

1

POST OFFICE BOX 655303

Source Current

Push-Pull Operation

Either Output

Total Range

Reference Supply, Trimmed to 1%

Tolerance

Protection

Conditions

description/ordering information

The TL598 incorporates all the functions required in the construction of pulse-width-modulated (PWM)

controlled systems on a single chip. Designed primarily for power-supply control, the TL598 provides the

systems engineer with the flexibility to tailor the power-supply control circuits to a specific application.

The TL598 contains two error amplifiers, an internal oscillator (externally adjustable), a dead-time control (DTC)

comparator, a pulse-steering flip-flop, a 5-V precision reference, undervoltage lockout control, and output

control circuits. Two totem-pole outputs provide exceptional rise- and fall-time performance for power FET

control. The outputs share a common source supply and common power ground terminals, which allow system

designers to eliminate errors caused by high current-induced voltage drops and common-mode noise.

offset that prevents overlap of the outputs during push-pull operation. A synchronous multiple supply operation

can be achieved by connecting RT to the reference output and providing a sawtooth input to CT.

The TL598 device provides an output control function to select either push-pull or parallel operation. Circuit

architecture prevents either output from being pulsed twice during push-pull operation. The output frequency

for push-pull applications is one-half the oscillator frequency f

1

2RTCT

. For single-ended applications:

f

1

RT CT

.

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP (N)

Tube of 25

TL598CN

TL598CN

0

°C to 70°C

SOIC (D)

Tube of 40

TL598CD

TL598C

0 C to 70 C

SOIC (D)

Reel of 2500

TL598CDR

TL598C

† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are

available at www.ti.com/sc/package.

Copyright

 2003, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1IN+

1IN−

FEEDBACK

DTC

CT

RT

SIGNAL GND

OUT1

2IN+

2IN−

REF

OUTPUT CTRL

VCC

VC

POWER GND

OUT2

D OR N PACKAGE

(TOP VIEW)

ERROR

AMP 1

ERROR

AMP 2