Overview
The TL494CDR, produced by Texas Instruments, is a pulse-width-modulation (PWM) control circuit designed primarily for 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 TL494CDR includes 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. It supports both push-pull and single-ended output operations and is characterized for operation from 0°C to 70°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Power Supply Voltage (VCC) | 7 to 40 | V |
| Collector Output Voltage (VC1, VC2) | 42 | V |
| Reference Output Voltage (REF) | 4.75 to 5.25 | V |
| Output Regulation (REF) | 1 to 15 | mV |
| Output Voltage Change with Temperature | 2 to 10 | mV/V |
| Short-Circuit Output Current (REF) | 25 | mA |
| Oscillator Frequency (CT = 0.01 μF, RT = 12 kΩ) | 10 kHz | |
| Standard Deviation of Frequency | 3.0% | |
| Maximum Duty Cycle | 45% | |
| Operating Temperature Range | 0°C to 70°C |
Key Features
- Complete Pulse Width Modulation Control Circuitry
- On-chip adjustable oscillator with master or slave operation
- 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
Applications
The TL494CDR is primarily designed for switch-mode power supply control. It is suitable for various power supply configurations, including synchronous multiple-rail power supplies. The device's flexibility and comprehensive features make it ideal for a wide range of applications requiring precise PWM control, such as DC-DC converters, power inverters, and other power management systems.
Q & A
- What is the primary function of the TL494CDR?
The TL494CDR is a pulse-width-modulation (PWM) control circuit designed primarily for power-supply control.
- What are the key components of the TL494CDR?
The device includes 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.
- What is the operating temperature range of the TL494CDR?
The TL494CDR is characterized for operation from 0°C to 70°C.
- Can the TL494CDR be used in push-pull or single-ended configurations?
Yes, the TL494CDR supports both push-pull and single-ended output operations.
- What is the maximum duty cycle of the TL494CDR?
The maximum duty cycle of the TL494CDR is 45%.
- How is the oscillator frequency adjusted in the TL494CDR?
The oscillator frequency can be adjusted using the resistor (RT) and capacitor (CT) connected to the oscillator terminals.
- Does the TL494CDR have undervoltage lockout protection?
Yes, the TL494CDR includes undervoltage lockout protection.
- What is the typical output voltage of the 5-V reference regulator?
The typical output voltage of the 5-V reference regulator is between 4.75 V and 5.25 V.
- Can the TL494CDR be used in synchronous multiple-rail power supplies?
Yes, the TL494CDR can drive common circuits in synchronous multiple-rail power supplies.
- What is the short-circuit output current of the reference output?
The short-circuit output current of the reference output is 25 mA.
