Overview
The TL594CDG4, produced by Texas Instruments, is a precision switchmode pulse-width-modulation (PWM) control circuit. This device is designed primarily for power-supply control and integrates all the necessary functions for constructing a PWM control circuit on a single chip. It 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 with 1% accuracy, an undervoltage lockout control circuit, and output control circuitry. The TL594CDG4 offers flexibility for systems engineers to tailor the power-supply control circuitry to specific applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Power Supply Voltage (VCC) | 7.0 | 15 | 40 | V |
| Collector Output Voltage (VC1, VC2) | -30 | 40 | V | |
| Collector Output Current (Each Transistor) | 200 | mA | ||
| Internal Reference Voltage (REF) | 4.95 | 5 | 5.05 | V |
| Oscillator Frequency (fosc) | 1 | 300 | kHz | |
| Output-Voltage Rise Time (Common-Emitter) | 100 | 200 | ns | |
| Output-Voltage Fall Time (Common-Emitter) | 30 | 100 | ns | |
| Operating Free-Air Temperature | 0 | 70 | °C |
Key Features
- Complete PWM Control Circuitry: Includes all necessary functions for a PWM control circuit on a single chip.
- On-Chip Adjustable Oscillator: Can be used in master or slave operation and can be bypassed for external control.
- On-Chip Error Amplifiers: With a common-mode voltage range of –0.3 V to VCC – 2 V.
- Internal 5-V Reference: With 1% accuracy and thermal stability.
- Adjustable Dead Time Control: Provides control over the total range of dead time.
- Uncommitted Output Transistors: Rated to 200 mA source or sink current, with common-emitter or emitter-follower output capability.
- Output Control: Selects single-ended or push-pull operation, with prohibition of double pulse at either output during push-pull operation.
- Undervoltage Lockout (UVLO): Locks the outputs off until the internal circuitry is operational.
- Pb-Free, Halogen Free/BFR Free, and RoHS Compliant: Environmentally friendly packaging.
Applications
- Power Supplies: AC/DC, isolated, with or without Power Factor Correction (PFC), and those above or below 90 W.
- Server Power Supplies: For data center and server applications.
- Solar Micro-Inverters and Solar Power Inverters: For renewable energy systems.
- Telecom/Server AC/DC Supplies: For telecommunications and server infrastructure.
- White Goods: For household appliances requiring efficient power management.
Q & A
- What is the primary function of the TL594CDG4?
The TL594CDG4 is a precision switchmode pulse-width-modulation (PWM) control circuit designed primarily for power-supply control.
- What are the key components of the TL594CDG4?
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, an undervoltage lockout control circuit, and output control circuitry.
- What is the range of the power supply voltage (VCC) for the TL594CDG4?
The power supply voltage (VCC) ranges from 7.0 V to 40 V.
- What is the accuracy of the internal 5-V reference voltage?
The internal 5-V reference voltage has an accuracy of 1%.
- Can the TL594CDG4 be used in push-pull or single-ended output operation?
Yes, the TL594CDG4 can be configured for either push-pull or single-ended output operation.
- What is the purpose of the undervoltage lockout (UVLO) feature?
The UVLO feature locks the outputs off until the internal circuitry is operational, ensuring safe startup conditions.
- What are the typical applications of the TL594CDG4?
Typical applications include power supplies, server power supplies, solar micro-inverters, telecom/server AC/DC supplies, and white goods.
- Is the TL594CDG4 environmentally friendly?
Yes, the TL594CDG4 is Pb-Free, Halogen Free/BFR Free, and RoHS Compliant.
- What is the operating temperature range for the TL594CDG4?
The operating temperature range is from 0°C to 70°C for the TL594C version.
- Can the oscillator be bypassed for external control?
Yes, the on-chip oscillator can be bypassed by terminating RT to the reference output and providing an external sawtooth input to CT.
