Overview
The UC3825ADWG4 is a high-speed PWM (Pulse Width Modulation) controller manufactured by Texas Instruments. It is an improved version of the standard UC3825 family, offering enhanced performance and functionality. This controller is designed for use in high-frequency switching applications, including power supplies, DC-DC converters, and other power management systems. It supports both voltage-mode and current-mode control methods, making it versatile for various design requirements.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Supply (Vcc/Vdd) | 8.4V ~ 22V | V |
| Frequency - Switching | 400kHz ~ 1MHz | Hz |
| Duty Cycle (Max) | 50% | % |
| Output Type | Transistor Driver | |
| Output Configuration | Positive | |
| Topology | Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull | |
| Number of Outputs | 2 | |
| Output Phases | 1 | |
| Control Features | Current Limit, Frequency Control, Ramp, Soft Start | |
| Operating Temperature | 0°C ~ 70°C (TA) | °C |
| Mounting Type | Surface Mount | |
| Package / Case | 16-SOIC (0.295", 7.50mm Width) |
Key Features
- Compatible with voltage-mode or current-mode control methods
- Practical operation at switching frequencies up to 1 MHz
- 50-ns propagation delay to output
- High-current dual totem pole outputs (2-A peak)
- 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
- Leading edge blanking to reject noise inherent with switched mode power conversion
- Soft-start and fault management features, including a fault latch that ensures full discharge of the soft-start capacitor before restart
Applications
The UC3825ADWG4 is suitable for a wide range of power management applications, including:
- DC-DC converters (Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull)
- Power supplies
- High-frequency switching systems
- Off-line power conversion systems
Q & A
- What is the operating voltage range of the UC3825ADWG4?
The UC3825ADWG4 operates within a supply voltage range of 8.4V to 22V. - What are the switching frequency capabilities of the UC3825ADWG4?
The UC3825ADWG4 can operate at switching frequencies from 400kHz to 1MHz. - What is the maximum duty cycle of the UC3825ADWG4?
The maximum duty cycle is 50%. - How many output phases does the UC3825ADWG4 have?
The UC3825ADWG4 has one output phase. - What are the key control features of the UC3825ADWG4?
The key control features include current limit, frequency control, ramp, and soft start. - What is the operating temperature range of the UC3825ADWG4?
The operating temperature range is from 0°C to 70°C. - What type of package does the UC3825ADWG4 come in?
The UC3825ADWG4 comes in a 16-SOIC package. - Does the UC3825ADWG4 support leading edge blanking?
Yes, the UC3825ADWG4 supports leading edge blanking to reject noise inherent with switched mode power conversion. - What is the purpose of the soft-start feature in the UC3825ADWG4?
The soft-start feature is programmed by a capacitor on the SS pin and helps in gradual power-up to prevent inrush currents and ensure stable operation. - How does the UC3825ADWG4 handle overcurrent conditions?
The UC3825ADWG4 has a latched overcurrent comparator that sets a fault latch, ensuring full discharge of the soft-start capacitor before allowing a restart.
