Overview
The TL494IDR, produced by Texas Instruments, is a pulse-width-modulation (PWM) control circuit integrated into a single chip. This device is primarily designed for power-supply control and offers the flexibility to tailor the power-supply control circuitry to specific applications. It incorporates all the necessary functions for constructing a PWM control circuit, including two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, and output-control circuits. The TL494IDR also features a 5-V, 5%-precision regulator and uncommitted output transistors capable of either common-emitter or emitter-follower operation.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | SOIC (16 pins) |
| Operating Temperature Range | -40°C to 85°C |
| Error Amplifier Common-Mode Voltage Range | -0.3 V to VCC - 2 V |
| Dead-Time Control Comparator Offset | Approximately 5% |
| Internal Regulator Voltage | 5 V with 5% tolerance |
| Output Transistor Current Capability | 200 mA sink or source current |
| Output Operation Modes | Single-ended or push-pull operation |
Key Features
- Complete PWM power-control circuitry on a single chip
- Uncommitted outputs for 200-mA sink or source current
- Output control selects single-ended or push-pull operation
- Internal circuitry prohibits double pulse at either output
- Variable dead time provides control over total range
- Internal regulator provides a stable 5-V reference supply with 5% tolerance
- Circuit architecture allows easy synchronization in synchronous multiple-rail power supplies
Applications
The TL494IDR is designed primarily for power-supply control applications. It is versatile and can be used in various power supply configurations, including single-ended and push-pull output operations. The device is particularly useful in synchronous multiple-rail power supplies where synchronization of the PWM signals is necessary. Additionally, its adjustable oscillator and dead-time control make it suitable for a wide range of power management applications.
Q & A
- What is the primary application of the TL494IDR?
The TL494IDR is primarily designed for power-supply control applications.
- What types of output operations does the TL494IDR support?
The TL494IDR supports both single-ended and push-pull output operations.
- What is the operating temperature range of the TL494IDR?
The operating temperature range of the TL494IDR is from -40°C to 85°C.
- What is the voltage tolerance of the internal 5-V regulator?
The internal 5-V regulator has a voltage tolerance of 5%.
- Can the TL494IDR be used in synchronous multiple-rail power supplies?
- What is the current capability of the output transistors?
The output transistors can sink or source up to 200 mA of current.
- How does the dead-time control comparator function?
The dead-time control comparator has a fixed offset that provides approximately 5% dead time.
- Can the on-chip oscillator be bypassed?
- What type of voltage range do the error amplifiers exhibit?
The error amplifiers exhibit a common-mode voltage range from -0.3 V to VCC - 2 V.
- Does the TL494IDR have any protection features?
