Texas Instruments 5962-9166801QEA Datasheet

TL598

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS053C – FEBRUAR Y 1988 – REVISED JULY 1999

Complete PWM Power Control Function

Totem-Pole Outputs for 200-mA Sink or Source Current

Output Control Selects Parallel or Push-Pull Operation

Internal Circuitry Prohibits Double Pulse at Either Output

Variable Dead-Time Provides Control Over Total Range

Internal Regulator Provides a Stable 5-V

ERROR AMP 1

FEEDBACK

SIGNAL GND

D OR N PACKAGE

(TOP VIEW)

1IN+

1IN–

2 3

DTC

6 7

OUT1

2IN+

2IN–

REF

OUTPUT CTRL

POWER GND

OUT2

Reference Supply, Trimmed to 1% T olerance

On-Board Output Current-Limiting Protection

Undervoltage Lockout for Low V

Conditions

Separate Power and Signal Grounds

TL598Q Has Extended Temperature Range ...–40°C to 125°C

description

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.

ERROR AMP 2

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.

The error amplifier has a common-mode voltage range from 0 V to VCC –2 V . The DTC comparator has a fixed 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

fO+

RT CT

fO+

2RTCT

. For single-ended applications:

The TL598C is characterized for operation from 0°C to 70°C. The TL598Q is characterized for operation from –40°C to 125°C.

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.

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.

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TL598

TL598Y

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS053C – FEBRUAR Y 1988 – REVISED JULY 1999

FUNCTION TABLE

0°C to 70°C TL598CD TL598CN –40°C to 125°C TL598QD –

Chip forms are tested at 25°C.

functional block diagram

RT CT

DTC

≈ 0.1 V

Oscillator

INPUT/OUTPUT

VI = GND Single-ended or parallel output

VI = REF Normal push-pull operation

DTC

Comparator

CTRL

AVAILABLE OPTIONS PACKAGED DEVICES

SMALL

OUTLINE

(D)

OUTPUT FUNCTION

PLASTIC

(see Function Table)

DIP

(N)

OUTPUT CTRL

CHIP FORM

(Y)

OUT1

1IN+ 1IN–

2IN+ 2IN–

FEEDBACK

Error Amplifier

1 2

Error Amplifier

16 15 3

PWM

–

Comparator

0.7 mA

Reference Regulator

Pulse-Steering

Flip-Flop

Undervoltage

Lockout Control

10 12

OUT2

POWER GND

REF SIGNAL

GND

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TL598

O erating free-air tem erature, T

°C

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS053C – FEBRUAR Y 1988 – REVISED JULY 1999

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

†

Supply voltage, VCC (see Note 1) 41 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Amplifier input voltage, VI V

+ 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Collector voltage 41 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output current (each output), sink or source, I

250 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θJA (see Notes 2 and 3): D package 73°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package 88°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. All voltage values, except differential voltages, are with respect to the signal ground terminal.

2. Maximum power dissipation is a function of TJ(max), ambient temperature is PD = (TJ(max) – TA)/

3. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace length of zero.

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

, and TA. The maximum allowable power dissipation at any allowable

. Operating at the absolute maximum TJ of 150°C can impact reliability.

recommended operating conditions

MIN MAX UNIT

Supply voltage, V Amplifier input voltage, V Collector voltage 40 V Output current (each output), sink or source, I Current into feedback terminal, I Timing capacitor , C Timing resistor , R Oscillator frequency, f

osc

TL598C 0 70 TL598Q –40 125

7 40 V 0 VCC–2 V

200 mA

0.3 mA

0.00047 10 µF

1.8 500 kΩ 1 300 kHz

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