Overview
The UC2525ADWTR is a pulse width modulator (PWM) integrated circuit produced by Texas Instruments. This device is part of the UCx52xA series, designed to enhance performance and reduce the external parts count in various switching power supply designs. The UC2525ADWTR operates within a voltage range of 8V to 35V and features a 5.1V reference voltage trimmed to 1% accuracy. It includes a wide range of functionalities such as adjustable dead-time control, internal soft-start circuitry, and pulse-by-pulse shutdown capabilities.
Key Specifications
| Parameter | Minimum | Typical | Maximum | 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 |
| Oscillator Frequency Range | 100 Hz | - | 500 kHz | - |
| Reference Voltage | 5.05 | 5.1 | 5.15 | V |
Key Features
- 8-V to 35-V operation range
- 5.1-V reference voltage trimmed to 1% accuracy
- 100-Hz to 500-kHz oscillator frequency range
- Separate oscillator sync terminal for synchronization with external clocks
- Adjustable dead-time control using a single resistor between CT and discharge terminals
- Internal soft-start circuitry with external timing capacitor
- Pulse-by-pulse shutdown and latching PWM to prevent multiple pulses
- Dual source and sink output drivers capable of sourcing or sinking over 200 mA
- Input undervoltage lockout with hysteresis
Applications
- Off-line and DC/DC power supplies
- Converters using voltage mode control
- Single-ended or two-switch topology designs
- Solar inverters
- Welding inverters
- Motor control systems
- Battery chargers
Q & A
- What is the operating voltage range of the UC2525ADWTR?
The UC2525ADWTR operates within a voltage range of 8V to 35V.
- What is the accuracy of the reference voltage in the UC2525ADWTR?
The reference voltage is trimmed to 1% accuracy.
- What is the oscillator frequency range of the UC2525ADWTR?
The oscillator frequency range is from 100 Hz to 500 kHz.
- Does the UC2525ADWTR support synchronization with external clocks?
Yes, it has a separate oscillator sync terminal for synchronization with external clocks.
- How is dead-time adjusted in the UC2525ADWTR?
Dead-time is adjusted using a single resistor between the CT and discharge terminals.
- What type of output drivers does the UC2525ADWTR have?
The UC2525ADWTR has dual source and sink output drivers capable of sourcing or sinking over 200 mA.
- Does the UC2525ADWTR have built-in soft-start circuitry?
Yes, it has internal soft-start circuitry that requires an external timing capacitor.
- What kind of protection does the UC2525ADWTR offer against undervoltage conditions?
The UC2525ADWTR features input undervoltage lockout with hysteresis.
- What are some common applications of the UC2525ADWTR?
Common applications include off-line and DC/DC power supplies, solar inverters, welding inverters, motor control systems, and battery chargers.
- How does the UC2525ADWTR handle shutdown commands?
The UC2525ADWTR supports pulse-by-pulse shutdown and latching PWM to prevent multiple pulses, with a shutdown terminal controlling both the soft-start circuitry and the output stages.
