Overview
The TL494IN, produced by Texas Instruments, is a highly integrated pulse-width-modulation (PWM) control circuit designed primarily for power supply control. This device incorporates all the necessary functions for constructing a PWM control circuit on a single chip, making it versatile for various power supply applications. The TL494IN 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, 5%-precision regulator. This architecture allows for easy synchronization and reduces the need for additional external circuitry, making it a robust solution for power supply control.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage Range | 7 | 40 | V | |
| Output Current (each transistor) | 200 | mA | ||
| Frequency Range | 1 kHz | 300 kHz | ||
| Internal Reference Voltage | 5 | V (with 5% tolerance) | ||
| Common-Mode Input Voltage Range | -0.3 | VCC - 2 | V | |
| Operating Temperature Range (TL494I) | -40 | 85 | °C | |
| Package Types | SOIC, PDIP, SOP, TSSOP |
Key Features
- Complete PWM power-control circuitry
- Uncommitted outputs for 200 mA sink or source current
- Internal circuitry prohibits double pulse at either output
- Variable dead time provides control over the total range
- Internal regulator provides a stable 5-V reference supply with 5% tolerance
- Circuit architecture allows easy synchronization
- Push-pull or single-ended output operation selectable through the output-control function
- Two high-gain error amplifiers with a common-mode input voltage range from –0.3 V to VCC – 2 V
Applications
- Desktop PCs
- Microwave Ovens
- Power Supplies: AC/DC, isolated, with or without PFC
- Server PSUs
- Solar Micro-Inverters
- Washing Machines: Low-end and High-end
- E-bikes
- Power supplies: Telecom/Server AC/DC Supplies: dual controller, analog
- Smoke detectors
- Solar power inverters
Q & A
- What is the primary function of the TL494IN device?
The TL494IN is a pulse-width-modulation (PWM) control circuit designed primarily for power supply control.
- What are the key components of the TL494IN device?
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, 5%-precision regulator.
- What is the operating voltage range of the TL494IN?
The operating voltage range is from 7 V to 40 V.
- What is the frequency range of the TL494IN's oscillator?
The frequency range is from 1 kHz to 300 kHz.
- Can the TL494IN operate in both push-pull and single-ended modes?
- What is the common-mode input voltage range of the error amplifiers?
The common-mode input voltage range is from –0.3 V to VCC – 2 V.
- What is the maximum output current per transistor?
The maximum output current per transistor is 200 mA.
- What are some common applications of the TL494IN?
Common applications include desktop PCs, microwave ovens, power supplies, server PSUs, solar micro-inverters, and washing machines.
- What is the temperature range for the TL494I device?
The TL494I device is characterized for operation from –40°C to 85°C.
- Does the TL494IN have built-in protection against double pulsing?
