Overview
The UC3825ADWTR is a high-speed Pulse Width Modulation (PWM) controller produced by Texas Instruments. This component is part of the UC3825 family, which is optimized for high-frequency switched-mode power supply applications. The UC3825ADWTR is known for its robust features and enhancements over its predecessors, making it a reliable choice for various power supply designs.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Supply Voltage | Up to 30V | V |
| Operating Temperature | 0°C to 70°C | °C |
| Switching Frequency | Up to 1 MHz | Hz |
| Propagation Delay to Output | 50-80 ns | ns |
| Output Current (Peak) | 1.5 A | A |
| Under-Voltage Lockout (UVLO) | 9.2V (on), 8.4V (off) | V |
| Package Type | SOIC-16 (DW Package) | |
| Duty Cycle Range | 0-85% | % |
Key Features
- Compatible with voltage or current mode topologies
- High current dual totem pole outputs (1.5A peak)
- Wide bandwidth error amplifier
- Fully latched logic with double pulse suppression
- Pulse-by-pulse current limiting
- Soft start and maximum duty cycle control
- Under-voltage lockout with hysteresis
- Low startup current (100 μA for the 'B' version)
- TTL/CMOS compatible clock output
- Leading edge blanking of the current sense input
- Full cycle soft start protection following a fault
Applications
The UC3825ADWTR is primarily used in high-frequency switched-mode power supply applications, including off-line power supplies, DC-DC converters, and other high-performance power management systems. Its features make it suitable for a wide range of industrial, automotive, and consumer electronics applications.
Q & A
- What is the maximum switching frequency of the UC3825ADWTR?
The maximum switching frequency is up to 1 MHz. - What is the operating temperature range of the UC3825ADWTR?
The operating temperature range is 0°C to 70°C. - What is the under-voltage lockout (UVLO) threshold for the UC3825ADWTR?
The UVLO thresholds are 9.2V (on) and 8.4V (off). - What is the peak output current of the UC3825ADWTR?
The peak output current is 1.5 A. - Does the UC3825ADWTR support both voltage and current mode topologies?
Yes, it supports both voltage and current mode topologies. - What is the propagation delay to the output of the UC3825ADWTR?
The propagation delay to the output is 50-80 ns. - What package type is the UC3825ADWTR available in?
The UC3825ADWTR is available in a SOIC-16 (DW Package). - Does the UC3825ADWTR have a soft start feature?
Yes, it includes a soft start feature along with maximum duty cycle control. - Is the UC3825ADWTR compatible with TTL/CMOS logic?
Yes, it has a TTL/CMOS compatible clock output. - What are some of the key enhancements in the UC3825ADWTR compared to its predecessors?
The UC3825ADWTR features leading edge blanking of the current sense input, full cycle soft start protection following a fault, and improved oscillator discharge current accuracy.
