The TL494 is a fixed frequency pulse width modulation control circuit designed primarily for SWITCHMODE power supply control. The main features are: 1. Complete pulse width modulation control circuitry 2. Integrated oscillator with master or slave operation 3. Integrated error amplifiers 4. Integrated 5.0 V reference 5. Adjustable dead time control 6. Uncommitted output transistors rated to 500 mA source or sink 7. Output control for push-pull or single-ended operation 8. NCV prefix for automotive and other applications requiring site and control changes
The TL494 and NCV494 are fixed-frequency pulse width modulation control circuits designed primarily for SWITCHMODE power supply control. They feature complete pulse width modulation control circuitry, including an on-chip oscillator with master or slave operation, on-chip error amplifiers, and an on-chip 5.0 V reference.
| Power Supply Voltage | 7.0 to 40 V |
|---|---|
| Collector Output Current | 500 mA |
| Operating Junction Temperature | 125 °C |
| Reference Voltage | 5.0 V |
| Oscillator Frequency | 1.0 to 200 kHz |
It is designed primarily for SWITCHMODE power supply control.
The internal 5.0 V reference has a typical thermal drift of less than 50 mV over an operating temperature range of 0° to 70°C.
The oscillator frequency is programmable by two external components, Rr and Cy.