Overview
The TL594CDE4, produced by Texas Instruments, is a pulse-width-modulation (PWM) control circuit integrated into a single chip. This device is designed primarily for power-supply control and offers extensive flexibility for tailoring 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, a 5-V regulator with 1% precision, and an undervoltage lockout control circuit. The TL594CDE4 is available in various packages, including SOIC and TSSOP, and is characterized for operation from 0°C to 70°C.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Power Supply Voltage (VCC) | 7.0 | 15 | 40 | V |
| Collector Output Voltage (VC1, VC2) | -30 | - | 40 | V |
| Collector Output Current (Each Transistor) | - | - | 500 | mA |
| Input Threshold Voltage (FEEDBACK) | 4 | 4.5 | - | V |
| Input Sink Current (FEEDBACK) | 0.3 | 0.7 | - | mA |
| Undervoltage Lockout Threshold Voltage | 6 | - | 6.9 | V |
| Output-Voltage Rise Time (Common-Emitter) | 100 | 200 | - | ns |
| Output-Voltage Fall Time (Common-Emitter) | 30 | 100 | - | ns |
| Oscillator Frequency (CT = 0.01 μF, RT = 12 kΩ) | 9.2 | 10 | 12 | kHz |
Key Features
- Complete PWM power-control circuitry on a single chip.
- Two error amplifiers with a common-mode voltage range of –0.3 V to VCC – 2 V.
- An on-chip adjustable oscillator that can be bypassed or used to drive common circuitry in synchronous multiple-rail power supplies.
- A dead-time control (DTC) comparator with approximately 5% dead time.
- A 5-V regulator with 1% precision.
- Undervoltage lockout control circuit to lock outputs off until internal circuitry is operational.
- Uncommitted output transistors capable of common-emitter or emitter-follower output configurations.
- Output control selects single-ended or push-pull operation.
- Circuit architecture allows easy synchronization.
Applications
- Power supplies: AC/DC, isolated, with PFC, > 90 W.
- Server PSUs.
- Solar micro-inverters and solar power inverters.
- Power supplies: AC/DC, isolated, no PFC, < 90 W.
- Telecom/server AC/DC supplies.
- White goods.
Q & A
- What is the primary function of the TL594CDE4?
The TL594CDE4 is a pulse-width-modulation (PWM) control circuit designed primarily for power-supply control.
- What are the key components of the TL594CDE4?
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.
- What is the operating temperature range for the TL594CDE4?
The TL594CDE4 is characterized for operation from 0°C to 70°C.
- What types of output configurations are supported by the TL594CDE4?
The device supports both single-ended and push-pull output operations, with selection by means of the output-control function.
- What is the purpose of the undervoltage lockout control circuit?
The undervoltage lockout control circuit locks the outputs off until the internal circuitry is operational.
- Can the on-chip oscillator be bypassed?
Yes, the on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT.
- What is the precision of the 5-V regulator?
The 5-V regulator has a precision of 1%.
- What is the maximum collector output current for each transistor?
The maximum collector output current for each transistor is 500 mA.
- What are some common applications of the TL594CDE4?
Common applications include power supplies, server PSUs, solar micro-inverters, and telecom/server AC/DC supplies.
- Is the TL594CDE4 RoHS compliant?
Yes, the TL594CDE4 is Pb-free, halogen-free/BFR-free, and RoHS compliant.
