What is TL494? PWM Controller, Control Circuit – Motorola

What is TL494?

It is a pulse width modulation (PWM) control circuit that is commonly used in power electronics applications such as switch-mode power supplies, DC-DC converters, and inverters. It was developed by Texas Instruments and has been widely used in various power electronics circuits due to its versatility and high level of integration.

The TL494 contains two error amplifiers, a voltage reference, an oscillator, a dead-time control (DTC) comparator, a pulse-steering flip-flop, and an output control circuit. It can operate over a wide input voltage range and is capable of driving high-current MOSFETs and IGBTs.

Part Number: TL494, TL494CN, TL494IN, TL494CD


Package: SO 16, DIP 16 Pin

Manufacturer: Motorola Inc


TL494 motorola TL494CN


The TL494 is a fixed frequency, pulse width modulation control circuit designed primarily for SWITCHMODE power supply control. The device provides a flexible way to control the duty cycle of a power converter by adjusting the frequency and the pulse width of the output waveform. By controlling the duty cycle, the output voltage or current of the power converter can be regulated.


1. Complete Pulse Width Modulation Control Circuitry
2. On–Chip Oscillator with Master or Slave Operation
3. On–Chip Error Amplifiers
4. On–Chip 5.0 V Reference
5. Adjustable Deadtime Control
6. Uncommitted Output Transistors Rated to 500 mA Source or Sink
7. Output Control for Push–Pull or Single–Ended Operation
8. Undervoltage Lockout



TL494 datasheet pinout


• Desktop PCs

• Microwave Ovens

• Power Supplies: AC/DC, Isolated, With or Without PFC

• Server PSUs

• Solar Micro-Inverters


Official Homepage:

1. https://www.ti.com/product/TL494

2. https://www.onsemi.com/pub_link/Collateral/TL494-D.PDF

TL494 Datasheet



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