Overview
The UC3525ADWTRG4 is a pulse width modulator (PWM) integrated circuit from Texas Instruments, part of the UCx52xA series. This device is designed to enhance performance and reduce the external component count in various switching power supply designs. It features a 5.1-V reference voltage trimmed to 1% accuracy, an oscillator with a wide frequency range of 100 Hz to 500 kHz, and separate oscillator sync terminal for synchronization with external systems. The UC3525ADWTRG4 also includes internal soft-start circuitry, pulse-by-pulse shutdown, and input undervoltage lockout with hysteresis, making it versatile for multiple power supply applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| +VIN Supply Voltage | - | - | 40 | V |
| VC Collector Supply Voltage | - | - | 40 | V |
| Logic Inputs | -0.3 | - | 5.5 | V |
| Analog Inputs | -0.3 | - | +VIN | V |
| Output Current (Source or Sink) | - | - | 500 | mA |
| Reference Output Current | - | - | 50 | mA |
| Oscillator Charging Current | - | - | 5 | mA |
| Operating Junction Temperature | -55 | - | 150 | °C |
| Lead Temperature (Soldering, 10 seconds) | - | - | 300 | °C |
| Storage Temperature | -65 | - | 150 | °C |
| Reference Voltage | 5.0 | 5.1 | 5.2 | V |
| Oscillator Frequency Range | 100 Hz | - | 500 kHz | - |
Key Features
- 8-V to 35-V operation
- 5.1-V reference voltage trimmed to 1%
- 100-Hz to 500-kHz oscillator range
- Separate oscillator sync terminal
- Adjustable dead-time control
- Internal soft-start circuitry
- Pulse-by-pulse shutdown
- Input undervoltage lockout with hysteresis
- Latching PWM to prevent multiple pulses
- Dual source and sink output drivers
Applications
- Off-line and DC/DC power supplies
- Converters using voltage mode
- Single-ended or two-switch topology designs
- Solar inverters
- Welding inverters
- Motor control
- Battery chargers
Q & A
- What is the operating voltage range of the UC3525ADWTRG4?
The UC3525ADWTRG4 operates within a voltage range of 8 V to 35 V.
- What is the accuracy of the reference voltage in the UC3525ADWTRG4?
The reference voltage is trimmed to 1% accuracy.
- What is the oscillator frequency range of the UC3525ADWTRG4?
The oscillator frequency range is from 100 Hz to 500 kHz.
- Does the UC3525ADWTRG4 have internal soft-start circuitry?
Yes, it includes internal soft-start circuitry.
- What type of output drivers does the UC3525ADWTRG4 have?
The device features dual source and sink output drivers.
- What are some common applications of the UC3525ADWTRG4?
Common applications include off-line and DC/DC power supplies, solar inverters, welding inverters, motor control, and battery chargers.
- How does the UC3525ADWTRG4 handle undervoltage conditions?
The device features input undervoltage lockout with hysteresis.
- Can the UC3525ADWTRG4 be synchronized with an external system clock?
Yes, it has a separate oscillator sync terminal for synchronization.
- What is the maximum output current of the UC3525ADWTRG4?
The maximum output current is 500 mA.
- What is the storage temperature range for the UC3525ADWTRG4?
The storage temperature range is from -65°C to 150°C.
