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Manufacturer Part #


TL Series 200 mA 200 kHz Surface Mount SWITCHMODE™ PWM Control Circuit - SOIC-16

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Mfr. Name: ON Semiconductor
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Product Specification Section
Technical Attributes
Attributes Table
Supply Current-Max: 200mA
Supply Voltage: 7V to 42V
Frequency-Max: 200kHz
Topology: Buck
Rated Power: 1000mW
Duty Cycle-Min: 0%
Duty Cycle-Max: 50%
Operating Temp Range: 0°C to 70°C
Storage Temperature Range: -55°C to +125°C
Output Current: 200mA
Thermal Resistance: 80°C/W
Package Style:  SOIC-16
Mounting Method: Surface Mount
Features & Applications

The TL494 is a fixed frequency, pulse width modulation control circuit designed primarily for SWITCHMODE power supply control.

The TL494 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 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. The TL494 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 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.

Key Features:

  • 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
  • NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes
  • Pb−Free Packages are Available


  • Optimize system size and efficiency
  • Simple to use in buck configuration


  • Off-line power supply
  • Buck converter
  • LED Lighting
  • VPA (Vehicle Power Adapter)
Pricing Section
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Factory Lead Time:
43 Weeks
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