Overview
The UC3525ADWG4 is a pulse width modulator (PWM) integrated circuit produced by Texas Instruments. It is part of the UCx52xA series, designed to enhance performance and reduce the external component count in various switching power supply designs. This device features a 5.1-V reference voltage trimmed to 1%, an oscillator with a wide frequency range (100 Hz to 500 kHz), and adjustable dead-time control. The UC3525ADWG4 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 |
| Oscillator Frequency Range | 100 Hz | - | 500 kHz | - |
| Reference Voltage | 5.0 | 5.1 | 5.2 | V |
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 for synchronization with external clocks
- Adjustable dead-time control using a single resistor
- Internal soft-start circuitry with external timing capacitor
- Pulse-by-pulse shutdown and soft-start recycle
- Input undervoltage lockout with hysteresis
- Latching PWM to prevent multiple pulses
- Dual source and sink output drivers capable of sourcing or sinking over 200 mA
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 UC3525ADWG4?
The UC3525ADWG4 operates within a voltage range of 8 V to 35 V.
- What is the reference voltage of the UC3525ADWG4?
The reference voltage is 5.1 V, trimmed to 1% accuracy.
- What is the oscillator frequency range of the UC3525ADWG4?
The oscillator frequency range is from 100 Hz to 500 kHz.
- Does the UC3525ADWG4 support synchronization with external clocks?
- How is dead-time adjusted in the UC3525ADWG4?
Dead-time is adjusted using a single resistor between the CT and discharge terminals.
- What is the purpose of the soft-start feature in the UC3525ADWG4?
The soft-start feature helps in gradually increasing the output voltage to prevent inrush currents and ensures a smooth startup.
- How does the UC3525ADWG4 handle shutdown?
The device features pulse-by-pulse shutdown and soft-start recycle, allowing for both instantaneous turn-off and soft-start during longer shutdown commands.
- What kind of output drivers does the UC3525ADWG4 have?
The UC3525ADWG4 has dual source and sink output drivers capable of sourcing or sinking over 200 mA.
- In what types of applications is the UC3525ADWG4 commonly used?
It is commonly used in off-line and DC/DC power supplies, solar inverters, welding inverters, motor control systems, and battery chargers.
- What is the maximum operating junction temperature of the UC3525ADWG4?
The maximum operating junction temperature is 150°C.
