Texas Instruments TL594CDR, TL594CD, TL594IN, TL594IDR, TL594ID Datasheet

...

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS052C – APRIL 1988 – REVISED JULY 1999

Complete PWM Power Control Circuitry

Uncommitted Outputs for 200-mA Sink or Source Current

Output Control Selects Single-Ended or Push-Pull Operation

Internal Circuitry Prohibits Double Pulse at

FEEDBACK

Either Output

Variable Dead Time Provides Control Over Total Range

Internal Regulator Provides a Stable 5-V Reference Supply Trimmed to 1%

Circuit Architecture Allows Easy Synchronization

Undervoltage Lockout for Low V

Conditions

description

The TL594 incorporates all the functions required in the construction of a pulse-width-modulation control circuit on a single chip. Designed primarily for power-supply control, these devices offer the systems engineer the flexibility to tailor the power-supply control circuitry to a specific application.

D OR N PACKAGE

(TOP VIEW)

1IN+

1IN–

2 3

DTC

GND

2IN+

2IN–

REF

OUTPUT CTRL

TL594

The TL594 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V regulator with a precision of 1%, an undervoltage lockout control circuit, and output control circuitry.

The error amplifiers exhibit a common-mode voltage range from –0.3 V to VCC –2 V . The DTC comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can be used to drive the common circuitry in synchronous multiple-rail power supplies.

The uncommitted output transistors provide either common-emitter or emitter-follower output capability . Each device provides for push-pull or single-ended output operation, with selection by means of the output-control function. The architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation. The undervoltage lockout control circuit locks the outputs off until the internal circuitry is operational.

The TL594C is characterized for operation from 0°C to 70°C. The TL594I is characterized for operation from –40°C to 85°C.

FUNCTION TABLE

INPUT

OUTPUT

CTRL

VI = –0 Single-ended or parallel output

VI = V

ref

OUTPUT FUNCTION

Normal push-pull operation

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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TL594

CHIP FORM

TL594Y

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS052C – APRIL 1988 – REVISED JULY 1999

AVAILABLE OPTIONS

PACKAGED DEVICES

0°C to 70°C TL594CD TL594CN

–40°C to 85°C TL594ID TL594IN

The D package is available taped and reeled. Add “R” suffix to device type (e.g., TL594CDR). Chip forms are tested at 25°C.

functional block diagram

RT CT

DTC

≈ 0.1 V

Oscillator

DTC

Comparator

SMALL OUTLINE

(D)

PLASTIC DIP

(N)

OUTPUT CTRL

(see Function Table)

(Y)

IN+ IN–

FEEDBACK

Error Amplifier 1

16 15

–

Error Amplifier 2

–

PWM

Comparator

0.7 mA

Pulse-Steering

Flip-Flop

Reference Regulator

Undervoltage

Lockout

Control

REF

GND

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TL594

Package thermal impedance, θ

(see Notes 2 and 3)

°C

O erating free-air tem erature, T

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS052C – APRIL 1988 – REVISED JULY 1999

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

TL594X UNIT

Supply voltage, VCC (see Note 1) 41 V Amplifier input voltage VCC+0.3 V Collector output voltage 41 V Collector output current 250 mA

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 network 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.

stg

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

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

D package 73 N package 88

–65 to 150 °C

recommended operating conditions

MIN MAX UNIT

Supply voltage, V Amplifier input voltage, V Collector output voltage, V Collector output current (each transistor) 200 mA Current into feedback terminal 0.3 mA Timing capacitor , C Timing resistor , R Oscillator frequency, f

osc

TL594C 0 70 °C TL594I –40 85 °C

7 40 V

–0.3 VCC–2 V

40 V

0.47 10000 nF

1.8 500 kΩ 1 300 kHz

†

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TL594

PARAMETER

TEST CONDITIONS

†

UNIT

PARAMETER

TEST CONDITIONS

UNIT

PARAMETER

TEST CONDITIONS

†

UNIT

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS052C – APRIL 1988 – REVISED JULY 1999

electrical characteristics over recommended operating conditions, VCC = 15 V, (unless otherwise noted)

reference section

TL594C, TL594I

MIN TYP‡MAX

Output voltage (REF) IO = 1 mA, TA = 25°C 4.95 5 5.05 V Input regulation VCC = 7 V to 40 V, TA = 25°C 2 25 mV Output regulation IO = 1 to 10 mA, TA = 25°C 14 35 mV Output-voltage change with temperature ∆TA = MIN to MAX 2 10 mV/V Short-circuit output current

†

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

‡

All typical values except for parameter changes with temperature are at TA = 25°C.

Duration of the short circuit should not exceed one second.

amplifier section (see Figure 1)

Input offset voltage, error amplifier FEEDBACK = 2.5 V 2 10 mV Input offset current FEEDBACK = 2.5 V 25 250 nA Input bias current FEEDBACK = 2.5 V 0.2 1 µA

Common-mode input voltage range, error amplifier

Open-loop voltage amplification, error amplifier

Unity-gain bandwidth VO = 0.5 V to 3.5 V, RL = 2 kΩ 800 kHz Common-mode rejection ratio, error

amplifier Output sink current, FEEDBACK VID = –15 mV to –5 V, FEEDBACK = 0.5 V 0.3 0.7 mA Output source current, FEEDBACK VID = 15 mV to 5 V, FEEDBACK = 3.5 V –2 mA

‡

All typical values except for parameter changes with temperature are at TA = 25°C.

VCC = 7 V to 40 V

∆VO = 3 V, RL = 2 kΩ, VO = 0.5 V to 3.5 V 70 95 dB

VCC = 40 V, TA = 25°C 65 80 dB

= 0 10 35 50 mA

ref

TL594C, TL594I

MIN TYP‡MAX

0.3 to

VCC–2

oscillator section, CT = 0.01 µF, RT = 12 kΩ (see Figure 2)

† ‡ ¶

TL594C, TL594I

MIN TYP‡MAX

Frequency 10 kHz Standard deviation of frequency Frequency change with voltage VCC = 7 V to 40 V, TA = 25°C 1 Hz/kHz Frequency change with temperature

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. All typical values except for parameter changes with temperature are at TA = 25°C. Standard deviation is a measure of the statistical distribution about the mean as derived from the formula:

n+1

(xn*

N*1

Temperature coefficient of timing capacitor and timing resistor not taken into account.

)

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All values of VCC, CT, RT, and TA constant 100 Hz/kHz

∆TA = MIN to MAX 50 Hz/kHz

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