TL494 Control Circuit: Features, Specifications and Applications

The TL494 device incorporates all the functions required in the construction of a pulse-widthmodulation (PWM) control circuit on a single chip. Designed pr amarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application.

The TL494 device 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 device provides for push-pull or singleended 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 device is characterized for operation from 0°C to 70°C. The TL494I device is characterized for operation from –40°C to 85°C.

Texas Instruments TL494IN technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments TL494IN.

• Desktop PCs 

• Microwave Ovens 

• Power Supplies: AC/DC, Isolated, With PFC, > 90 W 

• Server PSUs 

• Solar Micro-Inverters 

• Washing Machines: Low-End and High-End 

• E-Bikes 

• Power Supplies: AC/DC, Isolated, No PFC, < 90 W 

• Power: Telecom/Server AC/DC Supplies: Dual Controller: Analog 

• Smoke Detectors 

• Solar Power Inverters

Typical Application

Design Requirements 

• VI = 32 V 

• VO = 5 V 

• IO = 10 A 

• fOSC = 20-kHz switching frequency 

• VR = 20-mV peak-to-peak (VRIPPLE) 

• ΔIL = 1.5-A inductor current change

Download datasheets and manufacturer documentation for Texas Instruments TL494IN.