Overview
The UC3526ADWTRG4 from Texas Instruments is an advanced pulse-width modulator (PWM) controller designed for high-performance applications. This device is part of the UC3526A series, which offers improved performance over earlier versions. It is intended for use in power supply systems, motor control, and other applications requiring precise PWM control.
The UC3526ADWTRG4 features a robust set of functionalities, including a precision band-gap reference, high-frequency operation up to 600 kHz, and dual 200 mA source/sink output drivers. It also includes protective features such as under-voltage lockout, thermal shutdown, and programmable soft-start, making it a reliable choice for demanding applications.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Input Voltage | 7 | - | 35 | V |
| Collector Supply Voltage | 4.5 | - | 35 | V |
| Sink/Source Load Current (each output) | 0 | - | 100 | mA |
| Reference Load Current | 0 | - | 20 | mA |
| Oscillator Frequency Range | 1 Hz | - | 600 kHz | - |
| Operating Ambient Temperature Range | -40 | - | 85 | °C |
| Reference Output Voltage | 4.90 | 5.00 | 5.10 | V |
| Under-Voltage Lockout RESET Output Voltage | 0.2 | - | 0.4 | V |
| Oscillator Initial Accuracy | ±3 | - | ±8 | % |
Key Features
- Precision Band-Gap Reference: Internally trimmed to ±1% accuracy, providing a stable 5V reference voltage.
- High-Frequency Operation: Up to 600 kHz oscillator frequency.
- Dual Output Drivers: Capable of sourcing and sinking 200 mA peak and 100 mA continuously.
- Under-Voltage Lockout: Protects the device and power devices from inadequate supply voltage.
- Thermal Shutdown: Prevents overheating and ensures device reliability.
- Programmable Soft-Start: Reduces high current surges during power supply turn-on.
- Double-Pulse Suppression Logic: Minimizes cross-conduction current.
- TTL/CMOS Compatible Logic Ports: Bi-directional ports compatible with TTL and 5V CMOS logic.
Applications
- Power Supply Systems: Suitable for switching power supplies, including DC-DC converters and AC-DC converters.
- Motor Control: Used in motor control systems for precise speed and torque control.
- Industrial Automation: Applied in various industrial automation systems requiring reliable PWM control.
- Audio Equipment: Can be used in audio power amplifiers and other audio equipment requiring high-quality PWM signals.
Q & A
- What is the input voltage range for the UC3526ADWTRG4?
The input voltage range is from 7V to 35V.
- What is the maximum oscillator frequency of the UC3526ADWTRG4?
The maximum oscillator frequency is up to 600 kHz.
- What is the purpose of the under-voltage lockout feature?
The under-voltage lockout feature protects the device and the power devices it controls from inadequate supply voltage.
- How does the soft-start feature work?
The soft-start feature protects the power transistors and rectifier diodes from high current surges during power supply turn-on by gradually increasing the duty cycle of the PWM signal.
- What is the reference output voltage accuracy of the UC3526ADWTRG4?
The reference output voltage is internally trimmed to ±1% accuracy.
- Can the UC3526ADWTRG4 operate with TTL and CMOS logic?
Yes, the device has TTL/CMOS compatible logic ports.
- What is the maximum operating temperature of the UC3526ADWTRG4?
The maximum operating temperature is up to 85°C.
- How do you program the oscillator frequency and dead time for the UC3526ADWTRG4?
The oscillator frequency and dead time are programmed using the RT, CT, and RD components.
- What is the purpose of the thermal shutdown feature?
The thermal shutdown feature prevents overheating and ensures device reliability.
- Can the UC3526ADWTRG4 be used in motor control applications?
Yes, it is suitable for motor control systems requiring precise speed and torque control.
