Overview
The Texas Instruments UC3825ADW is a high-performance, dual PWM (Pulse Width Modulation) controller designed for use in high-frequency switched-mode power supply applications. This IC is part of the UC3825 family, which is optimized for current-mode control and supports various topologies such as boost, flyback, forward, full bridge, half bridge, and push-pull configurations. The UC3825ADW is known for its high switching frequencies, robust control features, and reliability, making it a versatile component for a wide range of power supply designs.
Key Specifications
| Specification | Value |
|---|---|
| Brand | Texas Instruments |
| Maximum Switching Frequency | 1000 kHz (1 MHz) |
| Output Current | 2 A (peak) |
| Control Method | Current, Voltage |
| Number of Outputs | 2 |
| Mounting Type | Surface Mount |
| Fall Time | 20 ns |
| Rise Time | 20 ns |
| Package Type | SOIC-16 |
| Pin Count | 16 |
| Topology | Boost, Flyback, Forward, Full Bridge, Half Bridge, Push-Pull |
| Maximum Duty Cycle | 50% |
| Dimensions | 10.28 x 7.52 x 2.35 mm |
| Minimum Operating Temperature | 0 °C |
| Maximum Operating Temperature | +70 °C |
| Voltage - Supply (Vcc/Vdd) | 8.4 V ~ 22 V |
Key Features
- High Switching Frequencies: Supports practical operation at switching frequencies up to 1 MHz.
- Dual Totem Pole Outputs: High-current outputs capable of 2 A peak currents during transitions.
- Current and Voltage Mode Compatibility: Compatible with both current-mode and voltage-mode control methods.
- Pulse-by-Pulse Current Limiting: Features pulse-by-pulse current limiting and a latched overcurrent comparator for robust fault management.
- Soft Start and Max Duty Cycle Control: Includes soft start functionality and maximum duty cycle control to prevent overloading during startup.
- Under-Voltage Lockout (UVLO): Equipped with UVLO with hysteresis to ensure stable operation.
- Leading Edge Blanking: Incorporates leading edge blanking to reject noise inherent in switched-mode power conversion.
- Low Startup Current: Low startup current of typically 1.1 mA, ideal for off-line applications.
Applications
The UC3825ADW is suitable for a variety of high-frequency switched-mode power supply applications, including:
- DC-DC Converters: Boost, flyback, forward, full bridge, half bridge, and push-pull converters.
- Power Supplies: Off-line and isolated power supplies requiring high efficiency and reliability.
- Industrial Power Systems: Used in industrial power systems that demand robust and high-frequency switching capabilities.
- Telecommunications Equipment: Suitable for power supply designs in telecommunications equipment.
Q & A
- What is the maximum switching frequency of the UC3825ADW?
The maximum switching frequency of the UC3825ADW is 1 MHz (1000 kHz).
- What are the supported control methods for the UC3825ADW?
The UC3825ADW supports both current-mode and voltage-mode control methods.
- How many outputs does the UC3825ADW have?
The UC3825ADW has two outputs.
- What is the package type of the UC3825ADW?
The UC3825ADW comes in a 16-pin SOIC package.
- What is the maximum duty cycle of the UC3825ADW?
The maximum duty cycle of the UC3825ADW is 50%.
- What are the operating temperature ranges for the UC3825ADW?
The UC3825ADW operates within a temperature range of 0 °C to +70 °C.
- Does the UC3825ADW have built-in current limiting features?
Yes, the UC3825ADW features pulse-by-pulse current limiting and a latched overcurrent comparator.
- What is the purpose of the soft start feature in the UC3825ADW?
The soft start feature in the UC3825ADW is designed to prevent overloading during startup by gradually increasing the output voltage.
- Is the UC3825ADW compatible with various power supply topologies?
Yes, the UC3825ADW is compatible with boost, flyback, forward, full bridge, half bridge, and push-pull topologies.
- What is the typical startup current of the UC3825ADW?
The typical startup current of the UC3825ADW is 1.1 mA.
