Overview
The UC2525BN, 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. It features a built-in +5.1V buried zener reference, an error amplifier with a common-mode range that includes the reference voltage, and a sync input for oscillator synchronization. The UC2525BN also includes built-in soft-start circuitry and a shutdown terminal for controlling the output stages and soft-start recycle.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Reference Voltage | 5.062 | 5.10 | 5.138 | V |
| Line Regulation (VIN = 8V to 35V) | 5 | 10 | mV | |
| Load Regulation (IL = 0mA to 20mA) | 7 | 15 | mV | |
| Temperature Stability | 10 | 50 | mV | |
| Total Output Variation (Line, Load, and Temperature) | 5.036 | 5.164 | V | |
| Short Circuit Current (VREF = 0, TJ = 25°C) | 80 | 100 | mA | |
| Output Noise Voltage (10Hz ≤ f ≤ 10kHz, TJ = 25°C) | 40 | 200 | µVrms | |
| Oscillator Frequency Range | 100Hz | - | 400kHz | - |
| Oscillator Timing Resistor Range | 2kΩ | - | 150kΩ | - |
| Oscillator Timing Capacitor Range | 0.001µF | - | 0.1µF | - |
| Dead Time Resistor Range | 0Ω | - | 500Ω | - |
Key Features
- Built-in +5.1V buried zener reference with ±0.75% accuracy
- Error amplifier with input common-mode range including the reference voltage, eliminating external resistors
- Sync input to the oscillator for synchronization with external system clocks or multiple units
- Single resistor for dead-time adjustment between CT and discharge terminals
- Built-in soft-start circuitry with external timing capacitor
- Shutdown terminal for controlling soft-start circuitry and output stages
- Instantaneous turn-off through PWM latch with pulsed shutdown and soft-start recycle with longer shutdown commands
Applications
The UC2525BN is suitable for a wide range of switching power supply applications, including DC-DC converters, power supplies for electronic devices, and other systems requiring precise PWM control. It is particularly useful in designs where reduced external component count and improved performance are critical.
Q & A
- What is the primary function of the UC2525BN? The UC2525BN is a pulse width modulator (PWM) integrated circuit designed for use in switching power supply applications.
- What is the voltage range of the built-in reference voltage? The built-in reference voltage is 5.1V with an accuracy of ±0.75%.
- How can the oscillator be synchronized? The oscillator can be synchronized using the sync input, allowing it to be slaved to an external system clock or multiple units.
- What is the purpose of the shutdown terminal? The shutdown terminal controls both the soft-start circuitry and the output stages, providing instantaneous turn-off and soft-start recycle.
- What is the range of the oscillator frequency? The oscillator frequency range is from 100Hz to 400kHz.
- What is the typical short circuit current of the UC2525BN? The typical short circuit current is 100mA.
- What type of capacitor is required for the soft-start circuitry? An external timing capacitor is required for the soft-start circuitry.
- What is the temperature range for the UC2525BN? The UC2525BN operates over a temperature range of -40°C to +85°C.
- Can the UC2525BN be used in high-frequency applications? Yes, the UC2525BN can operate up to 400kHz, making it suitable for high-frequency applications.
- What are the common package types for the UC2525BN? The UC2525BN is available in packages such as DIP, SOIC, and PLCC.
