Overview
The TL494CNS, produced by Texas Instruments, is a pulse-width-modulation (PWM) control circuit designed primarily for switch-mode power supply control. This device integrates all the necessary functions for constructing a PWM control circuit on a single chip, offering flexibility to tailor the power-supply control circuitry to specific applications.
The TL494CNS includes two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V precision regulator, and output-control circuits. This comprehensive set of features makes it an ideal choice for various power supply control applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 7 | - | 40 | V |
| Collector Output Voltage (VC1, VC2) | - | - | 40 | V |
| Collector Output Current (each transistor) | - | - | 200 | mA |
| Operating Temperature Range (TL494C) | 0 | - | 70 | °C |
| Operating Temperature Range (TL494I) | -40 | - | 85 | °C |
| Oscillator Frequency (CT = 0.01 μF, RT = 12 kΩ) | - | 10 kHz | - | kHz |
| Output Voltage (REF) at IO = 1 mA | 4.75 | 5 | 5.25 | V |
| Input Regulation (VCC = 7 V to 40 V) | - | - | 25 mV | - |
Key Features
- Complete PWM Power-Control Circuitry
- On-Chip Adjustable Oscillator with Master or Slave Operation
- On-Chip Error Amplifiers
- On-Chip 5.0 V Reference with 5% Precision
- Adjustable Dead-Time Control
- Uncommitted Output Transistors Rated to 200 mA Source or Sink Current
- Output Control for Push-Pull or Single-Ended Operation
- Internal Circuitry Prohibits Double Pulse at Either Output
- Undervoltage Lockout
- Circuit Architecture Allows Easy Synchronization
Applications
The TL494CNS is primarily designed for switch-mode power supply control, making it suitable for a wide range of applications including:
- Switch-Mode Power Supplies
- Synchronous Multiple-Rail Power Supplies
- Automotive and Industrial Power Systems (with NCV prefix)
- General Purpose PWM Control Circuits
Q & A
- What is the primary application of the TL494CNS?
The TL494CNS is primarily designed for switch-mode power supply control.
- What are the key components of the TL494CNS?
The TL494CNS includes two error amplifiers, an on-chip adjustable oscillator, a dead-time control comparator, a pulse-steering control flip-flop, a 5-V precision regulator, and output-control circuits.
- What is the operating temperature range for the TL494C?
The operating temperature range for the TL494C is from 0°C to 70°C.
- What is the operating temperature range for the TL494I?
The operating temperature range for the TL494I is from –40°C to 85°C.
- What is the typical oscillator frequency of the TL494CNS?
The typical oscillator frequency is 10 kHz with CT = 0.01 μF and RT = 12 kΩ.
- Can the TL494CNS be used in push-pull or single-ended output operation?
- What is the precision of the on-chip 5-V reference voltage?
The on-chip 5-V reference voltage has a precision of 5%.
- Is the TL494CNS suitable for automotive applications?
- Can the oscillator be bypassed in the TL494CNS?
- What is the maximum collector output current for each transistor?
The maximum collector output current for each transistor is 200 mA.
