Overview
The UC2825DW/80903 is a high-performance PWM (Pulse Width Modulation) controller IC designed by Unitrode, now part of Texas Instruments. This device is optimized for high-frequency switched-mode power supply applications, offering compatibility with both voltage and current mode topologies. It features advanced protection and control mechanisms, making it suitable for a wide range of power supply designs.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOIC (DW) - 16 pins |
| Operating Temperature Range | -40°C to 85°C |
| Switching Frequency | Up to 1 MHz |
| Propagation Delay to Output | 50 ns |
| Output Current (Peak) | 1.5 A |
| Under-Voltage Lockout (UVLO) | 9.2V/8.4V with 800 mV hysteresis |
| Maximum Duty Cycle | 80% |
| Start-Up Current | 1.1 mA |
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 UC2825DW/80903 is designed for use in high-frequency switched-mode power supply applications, including but not limited to:
- DC-DC converters
- Power supplies for electronic devices
- High-frequency switching regulators
- Current and voltage mode control systems
Q & A
- What is the operating temperature range of the UC2825DW/80903?
The operating temperature range is -40°C to 85°C. - What is the maximum switching frequency of the UC2825DW/80903?
The maximum switching frequency is up to 1 MHz. - What is the propagation delay to output for the UC2825DW/80903?
The propagation delay to output is 50 ns. - What is the peak output current of the UC2825DW/80903?
The peak output current is 1.5 A. - What is the under-voltage lockout (UVLO) threshold for the UC2825DW/80903?
The UVLO threshold is 9.2V/8.4V with 800 mV hysteresis. - What is the maximum duty cycle for the UC2825DW/80903?
The maximum duty cycle is 80%. - What is the start-up current of the UC2825DW/80903?
The start-up current is 1.1 mA. - Is the UC2825DW/80903 compatible with both voltage and current mode topologies?
Yes, it is compatible with both voltage and current mode topologies. - Does the UC2825DW/80903 have pulse-by-pulse current limiting?
Yes, it features pulse-by-pulse current limiting. - What type of logic does the UC2825DW/80903 use?
The UC2825DW/80903 uses fully latched logic with double pulse suppression.
