HGSEMI TL494N

The TL494 device 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 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 - 0.3V to VCC - 2V. 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 six- tooth 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 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 device is characterized for operation from 0°C to 70°C. The TL494I device is characterized for operation from - 40°C to 85°C.

• Complete PWM Power-Control Circuitry
• Uncommitted Outputs for 200-mA Sink or Source Current
• Output Control Selects Single-Ended or Push-Pull Operation
• Internal Circuitry Prohibits Double Pulse at Either Output
• Variable Dead Time Provides Control Over Total Range
• Internal Regulator Provides a Stable 5-V Reference Supply With 5% Tolerance
• Circuit Architecture Allows Easy Synchronization