Overview
The UC3525ANG4, produced by Texas Instruments, is a pulse width modulator (PWM) integrated circuit designed for use in various switching power supply applications. This device is part of the UCx52xA series, which offers improved performance and reduced external component count. The UC3525ANG4 operates over a wide voltage range and features a robust set of functionalities, including an on-chip 5.1-V reference, adjustable dead-time control, and internal soft-start circuitry.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| +VIN Supply Voltage | - | - | 40 | V |
| VC Collector Supply Voltage | - | - | 40 | V |
| Output Current (Source or Sink) | - | - | 500 | mA |
| Reference Output Current | - | - | 50 | mA |
| Oscillator Frequency Range | 100 Hz | - | 500 kHz | - |
| Operating Junction Temperature | -55 | - | 150 | °C |
| Storage Temperature | -65 | - | 150 | °C |
Key Features
- 8-V to 35-V operation
- 5.1-V reference trimmed to 1%
- 100-Hz to 500-kHz oscillator range
- Separate oscillator sync terminal
- Adjustable dead-time control
- Internal soft start
- 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 UC3525ANG4?
The UC3525ANG4 operates over a voltage range of 8 V to 35 V.
- What is the oscillator frequency range of the UC3525ANG4?
The oscillator frequency range is from 100 Hz to 500 kHz.
- Does the UC3525ANG4 have internal soft-start circuitry?
Yes, the UC3525ANG4 features internal soft-start circuitry.
- What is the purpose of the oscillator sync terminal?
The oscillator sync terminal allows multiple units to be slaved or synchronized to an external system clock.
- How is dead-time adjusted in the UC3525ANG4?
Dead-time is adjusted using a single resistor between the CT and discharge terminals.
- What type of output drivers does the UC3525ANG4 have?
The UC3525ANG4 has dual source and sink output drivers.
- What is the maximum output current of the UC3525ANG4?
The maximum output current is 500 mA.
- Does the UC3525ANG4 have input undervoltage lockout?
Yes, it has input undervoltage lockout with hysteresis.
- What is the typical storage temperature range for the UC3525ANG4?
The storage temperature range is from -65°C to 150°C.
- What are some common applications of the UC3525ANG4?
Common applications include off-line and DC/DC power supplies, solar inverters, welding inverters, motor control, and battery chargers.
