Overview
The TL594IDR, produced by Texas Instruments, is a pulse-width-modulation (PWM) control circuit integrated into a single chip. It is designed primarily for power-supply control, offering systems engineers the flexibility to tailor the power-supply control circuitry to specific applications. The device includes all necessary functions for constructing a PWM control circuit, such as two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V regulator, and an undervoltage lockout control circuit. This architecture allows for easy synchronization and provides a stable 5-V reference supply trimmed to 1% precision.
Key Specifications
| Parameter | Description |
|---|---|
| Package | SOIC (D), 16 pins |
| Operating Temperature Range | -40°C to 85°C |
| Output Current Capability | Up to 200 mA sink or source current |
| Oscillator Frequency | Programmable using external timing components RT and CT |
| 5-V Reference Regulator | Stable 5-V reference supply trimmed to 1% precision |
| Undervoltage Lockout (UVLO) | Locks outputs off until VCC is above 6 V |
| Error Amplifiers | Common-mode voltage range of –0.3 V to VCC – 2 V |
| Dead-Time Control (DTC) Comparator | Provides approximately 5% dead time |
Key Features
- Complete PWM Power-Control Circuitry
- 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 Trimmed to 1%
- Circuit Architecture Allows Easy Synchronization
- Undervoltage Lockout (UVLO) for Low-VCC Conditions
Applications
- White Goods
- Power Supplies: AC/DC, Isolated, With PFC, > 90 W
- Server PSUs
- Solar Micro-Inverters
- Power Supplies: AC/DC, Isolated, No PFC, < 90 W
- Power: Telecom/Server AC/DC Supplies
- Solar Power Inverters
Q & A
- What is the primary function of the TL594IDR?
The TL594IDR is a pulse-width-modulation (PWM) control circuit designed primarily for power-supply control.
- What are the key components of the TL594IDR?
The device includes two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V regulator, and an undervoltage lockout control circuit.
- How is the oscillator frequency controlled in the TL594IDR?
The oscillator frequency is programmable using external timing components RT and CT.
- What is the purpose of the 5-V reference regulator in the TL594IDR?
The 5-V reference regulator provides a stable 5-V reference supply trimmed to 1% precision, which is used to power the output-control logic, pulse-steering flip-flop, oscillator, dead-time control comparator, and PWM comparator.
- What is the undervoltage lockout (UVLO) feature in the TL594IDR?
The undervoltage lockout (UVLO) feature locks the outputs off until the internal circuitry is operational, specifically when VCC is above 6 V.
- Can the TL594IDR operate in both single-ended and push-pull modes?
- What is the maximum current capability of the output transistors in the TL594IDR?
The output transistors can sink or source up to 200 mA.
- What are some common applications of the TL594IDR?
- What is the operating temperature range of the TL594IDR?
- How does the TL594IDR prevent double pulsing during push-pull operation?
