PWM Controller (Automotive)

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Overview

The TL494 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 flexibility to tailor the power-supply control circuitry to a specific application.

The TL494 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, 5%-precision regulator, and output-control circuits.

The error amplifiers exhibit a common-mode voltage range from -0.3 V to VCC -2 V. The dead-time control 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 drive the common circuits in synchronous multiple-rail power supplies.

The uncommitted output transistors provide either common-emitter or emitter-follower output capability. This PWM Controller provides for push-pull or single-ended output operation, which can be selected through the output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation.

The TL494C PWM Controller is characterized for operation from 0C to 70C. The TL494I is characterized for operation from -40C to 85C. The TL494B is characterized for operation from -40C to 125C. The NCV494B is characterized for -40C to 125C and certified for automotive applications.

  • 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
  • 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*
  • Variable Frequency Operation (up to 200 KHz)
  • PWM Buck Controller Configuration

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NCV494BDR2G

Active

Pb

A

H

P

SOIC-16

1

260

REEL

2500

N

Step-Down

1

Voltage Mode

7

40

200

$0.6

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NCV494BDR2

Obsolete

Pb

A

H

P

SOIC-16

1

235

REEL

2500

N

Step-Down

1

Voltage Mode

7

40

200

Price N/A

More Details

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