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TL494 from UT

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TL494

Manufacturer: UT

Voltage mode PWM control circuit.

Partnumber Manufacturer Quantity Availability
TL494 UT 2019 In Stock

Description and Introduction

Voltage mode PWM control circuit. The TL494 is a pulse-width-modulation (PWM) control circuit manufactured by **UT Microelectronics (Unisonic Technologies)**. Below are the specifications, descriptions, and features based on Ic-phoenix technical data files:  

### **Specifications:**  
- **Supply Voltage (VCC):** 7V to 40V  
- **Output Current (per Transistor):** 200mA (sink or source)  
- **Oscillator Frequency Range:** 1kHz to 300kHz  
- **Duty Cycle Adjustable Range:** 0% to 100%  
- **Error Amplifier Input Voltage Range:** -0.3V to VCC - 2V  
- **Operating Temperature Range:** -20°C to +85°C (or -40°C to +85°C for industrial-grade versions)  
- **Package Types:** DIP-16, SOIC-16  

### **Descriptions:**  
- The TL494 is a fixed-frequency PWM controller IC designed for switch-mode power supply (SMPS) and DC-DC converter applications.  
- It includes an on-chip oscillator, error amplifiers, a dead-time control comparator, a flip-flop, and two output transistors (totem-pole or open-emitter configurations).  
- The device supports push-pull or single-ended output operation.  

### **Features:**  
- Adjustable dead-time control for output pulses.  
- Dual error amplifiers for feedback loop control.  
- Internal oscillator with sync capability for multiple IC synchronization.  
- Built-in under-voltage lockout (UVLO) protection.  
- Output control for push-pull or single-ended operation.  
- Low standby current (typically 10mA).  

This information is strictly based on the manufacturer's datasheet for the **UT TL494**.

Application Scenarios & Design Considerations

Voltage mode PWM control circuit.

Alternative Part Number

  • SG3524N --: Classic PWM controller with similar regulation and dual-output drive functions; widely available and well documented as a TL494 substitute in many power supply designs.
  • UC3842AN --: Current-mode PWM controller commonly used in offline converters; suitable functional replacement when the design tolerates current-mode control instead of voltage-mode.
  • KA7500B --: Pin-compatible PWM controller functionally equivalent to the TL494, often used as a direct drop-in alternative in SMPS applications.

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