Overview
The UC3825DWTR is a high-speed PWM (Pulse Width Modulation) controller produced by Texas Instruments. This integrated circuit is designed for high-frequency switched-mode power supply applications. It is part of the UC1825 family, which includes the UC2825 and UC3825, each optimized for different temperature ranges. The UC3825DWTR is particularly suited for applications requiring high switching frequencies and robust control features.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Supply Voltage (Vcc) | 8.4 to 30 | V |
| Switching Frequency | 340 kHz to 460 kHz | kHz |
| Duty Cycle (Max) | 85% | % |
| Output Current | 200 mA | mA |
| Output Voltage | 13 V | V |
| Number of Outputs | 2 | - |
| Topology | Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull | - |
| Operating Temperature | 0°C to 70°C | °C |
| Package Type | 16-SOIC (0.295", 7.50mm Width) | - |
| Control Features | Current Limit, Enable, Frequency Control, Ramp, Soft Start | - |
Key Features
- Compatible with voltage or current mode topologies
- Practical operation at switching frequencies up to 1 MHz
- 50 ns propagation delay to output
- High current dual totem pole outputs (1.5 A 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 start-up current (1.1 mA)
Applications
The UC3825DWTR is suitable for a variety of high-frequency switched-mode power supply applications, including:
- Buck, Boost, Flyback, Forward, Full-Bridge, Half-Bridge, and Push-Pull converters
- High-frequency DC-DC converters
- Switched-mode power supplies requiring robust control and high switching frequencies
Q & A
- What is the maximum switching frequency of the UC3825DWTR?
The UC3825DWTR can operate at switching frequencies up to 1 MHz.
- What are the supported topologies for the UC3825DWTR?
The UC3825DWTR supports Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, and Push-Pull topologies.
- What is the maximum duty cycle for the UC3825DWTR?
The maximum duty cycle for the UC3825DWTR is 85%.
- What is the operating temperature range for the UC3825DWTR?
The operating temperature range for the UC3825DWTR is 0°C to 70°C.
- What package type is the UC3825DWTR available in?
The UC3825DWTR is available in a 16-SOIC package.
- Does the UC3825DWTR have current limiting features?
Yes, the UC3825DWTR includes pulse-by-pulse current limiting and a current limit/shutdown section.
- What is the propagation delay to output for the UC3825DWTR?
The propagation delay to output for the UC3825DWTR is 50 ns.
- Does the UC3825DWTR have under-voltage lockout?
Yes, the UC3825DWTR features under-voltage lockout with hysteresis.
- What is the start-up current for the UC3825DWTR?
The start-up current for the UC3825DWTR is 1.1 mA.
- Is the UC3825DWTR RoHS compliant?
Yes, the UC3825DWTR is RoHS compliant.
