Overview
The UC3825ADWTRG4 is a high-speed PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UC3825 family, which has been enhanced with several performance improvements over the standard UC3823 and UC3825 models. This controller is designed for high-frequency switching applications, making it suitable for various power management and switching regulator designs.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | 16-SOIC (0.295", 7.50mm Width) |
| Switching Frequency | Up to 1 MHz |
| Propagation Delay to Output | 50 ns |
| Output Current | 2-A peak |
| Error Amplifier Gain Bandwidth Product | 12 MHz |
| Input Offset Voltage | 2 mV |
| Current Limit Threshold Tolerance | 5% |
| Oscillator Discharge Current | 10 mA |
| Startup Supply Current | Typically 100 μA |
| Overcurrent Comparator Threshold | 1.2 V |
Key Features
- Compatible with voltage-mode or current-mode control methods
- High-current dual totem pole outputs capable of 2-A peak currents
- Trimmed oscillator discharge current for accurate dead time control
- Low 100-μA startup current ideal for off-line applications
- Pulse-by-pulse current limiting comparator and latched overcurrent comparator with full cycle restart
- Redesigned output drivers to actively sink current during UVLO without affecting startup current
- CLOCK pin (CLK/LEB) combines clock output and leading edge blanking adjustment, buffered for easier interfacing
Applications
The UC3825ADWTRG4 is suitable for a variety of high-frequency switching applications, including but not limited to:
- Switching power supplies and DC-DC converters
- Motor control systems
- High-frequency resonant converters
- Off-line power supplies where low startup current is crucial
Q & A
- What is the maximum switching frequency of the UC3825ADWTRG4?
The UC3825ADWTRG4 can operate at switching frequencies up to 1 MHz. - What is the propagation delay to output for this controller?
The propagation delay to output is 50 ns. - What is the peak output current capability of the UC3825ADWTRG4?
The output drivers are capable of 2-A peak currents. - What is the error amplifier gain bandwidth product of this controller?
The error amplifier gain bandwidth product is 12 MHz. - What is the input offset voltage of the UC3825ADWTRG4?
The input offset voltage is 2 mV. - What is the tolerance of the current limit threshold?
The current limit threshold is assured to a tolerance of 5%. - What is the oscillator discharge current specified for the UC3825ADWTRG4?
The oscillator discharge current is specified at 10 mA. - What is the typical startup supply current of this controller?
The typical startup supply current is 100 μA. - What is the threshold of the overcurrent comparator in the UC3825ADWTRG4?
The overcurrent comparator threshold is 1.2 V. - How does the CLOCK pin (CLK/LEB) function in the UC3825ADWTRG4?
The CLOCK pin combines the functions of clock output and leading edge blanking adjustment and is buffered for easier interfacing.
