PWM Controller

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Overview

The TL594 PWM Controller incorporates all the functions required in the construction of a pulse width modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the systems engineer the flexibility to tailor the power-supply control circuitry to a specific application.

The TL594 PWM Controller 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 1.5%, an undervoltage lockout control circuit, and output control circuitry.

The error amplifiers have a common-mode voltage range of -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 TL594CD, CN, CDTB are characterized for operation from -40C to 85C.

  • Off-line power supply
  • Buck converter
  • VPA (Vehicle Power Adapter)
  • LED Lighting
  • Complete Pulse Width Modulation Control Circuitry
  • On-Chip Oscillator with Master or Slave Operation
  • On-Chip Error Amplifiers
  • On-Chip 5.0 V Reference, 1.5% Accuracy
  • Adjustable Deadtime Control
  • Uncommitted Output Transistors Rated to 500 mA Source or Sink
  • Output Control for Push-Pull or Single-Ended Operation
  • Undervoltage Lockout
  • Pb-Free Packages are Available
  • PWM Buck Controller Configuration
  • Variable Frequency Operation (up to 300 KHz)

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ECAD Models

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TL594CNG

Obsolete

Pb

A

H

P

PDIP-16

NA

0

TUBE

500

N

Push-Pull

1

Voltage Mode

6

42

40

Price N/A

More Details

TL594CDTBR2G

Active

Pb

A

H

P

TSSOP-16

1

260

REEL

2500

N

Push-Pull

1

Voltage Mode

6

42

40

$0.5897

More Details

TL594CDR2G

Active

Pb

A

H

P

SOIC-16

1

260

REEL

2500

Y

Push-Pull

1

Voltage Mode

6

42

40

$0.4157

More Details

TL594CDG

Obsolete

Pb

A

H

P

SOIC-16

1

260

TUBE

48

N

Push-Pull

1

Voltage Mode

6

42

40

Price N/A

More Details

TL594CDTBG

Obsolete

Pb

A

H

P

TSSOP-16

1

260

TUBE

96

N

Push-Pull

1

Voltage Mode

6

42

40

Price N/A

More Details

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