Overview
The TL494 is a pulse-width-modulation (PWM) control circuit designed primarily for switch-mode power supply control. Produced by Texas Instruments, this device integrates all the necessary functions for constructing a PWM control circuit on a single chip. It features two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, and a 5-V reference regulator. The TL494 is versatile and can be tailored to specific power supply control applications, offering push-pull or single-ended output operation and support for various topologies such as boost, buck, flyback, forward, full-bridge, and half-bridge configurations.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 7 to 40 | V |
| Output Voltage (VC1, VC2) | 42 | V |
| Output Current | 200 | mA |
| Switching Frequency | 1 kHz to 300 kHz | kHz |
| Duty Cycle (Max) | 45% | % |
| Operating Temperature Range | -40 to 85, 0 to 70 | °C |
| Package Type | PDIP, TSSOP, SOIC, SOP | |
| Number of Pins | 16 | |
| Reference Voltage (Vref) | 4.75 to 5.25 | V |
Key Features
- Complete PWM control circuitry on a single chip
- On-chip adjustable oscillator with master or slave operation
- Two on-chip error amplifiers
- On-chip 5-V reference regulator
- Adjustable dead-time control
- Uncommitted output transistors rated to 500 mA source or sink
- Output control for push-pull or single-ended operation
- Undervoltage lockout (UVLO)
- Support for multiple topologies: boost, buck, flyback, forward, full-bridge, half-bridge
Applications
- Desktop PCs
- Microwave Ovens
- Server PSUs
- Solar Micro-Inverters
- Washing Machines (low-end and high-end)
- E-Bikes
- Telecom/Server AC/DC Supplies
- Smoke Detectors
- Solar Power Inverters
Q & A
- What is the primary function of the TL494 IC?
The TL494 is a pulse-width-modulation (PWM) control circuit primarily designed for switch-mode power supply control.
- What are the key components integrated into the TL494 IC?
The TL494 includes two error amplifiers, an on-chip adjustable oscillator, a dead-time control comparator, a pulse-steering control flip-flop, and a 5-V reference regulator.
- What is the operating temperature range of the TL494 IC?
The operating temperature range is from -40°C to 85°C and 0°C to 70°C depending on the device variant.
- What are the supported output configurations of the TL494 IC?
The TL494 supports push-pull or single-ended output operation.
- What are the typical applications of the TL494 IC?
Typical applications include desktop PCs, microwave ovens, server PSUs, solar micro-inverters, washing machines, e-bikes, telecom/server AC/DC supplies, smoke detectors, and solar power inverters.
- What is the maximum switching frequency of the TL494 IC?
The maximum switching frequency is 300 kHz.
- What is the maximum duty cycle of the TL494 IC?
The maximum duty cycle is 45%.
- What types of packages are available for the TL494 IC?
The TL494 is available in 16-pin PDIP, TSSOP, SOIC, and SOP packages.
- Does the TL494 IC have undervoltage lockout (UVLO) protection?
Yes, the TL494 IC includes undervoltage lockout (UVLO) protection.
- What is the reference voltage output of the TL494 IC?
The reference voltage output is 5 V with a precision of 4.75 to 5.25 V.
