Overview
The UC3825ANG4 is a high-speed Pulse Width Modulation (PWM) controller produced by Texas Instruments. This IC is part of the UC3825A series and is designed for use in a variety of DC-DC converter topologies. It supports both voltage-mode and current-mode control methods, making it versatile for different power management applications. The UC3825ANG4 features improved performance enhancements over its predecessors, including high-current dual totem pole outputs, low startup current, and advanced protection mechanisms such as pulse-by-pulse current limiting and overcurrent protection.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | UC3825ANG4 |
| Package Type | 16-PDIP (0.300", 7.62mm) |
| Number of Outputs | 2 |
| Switching Frequency | 400kHz ~ 1MHz |
| Duty Cycle (Max) | 50% |
| Supply Voltage | 8.4V ~ 22V |
| Operating Temperature | 0°C ~ 70°C |
| Topology | Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull |
| Output Current (Typ) | 200mA (peak 2A) |
| Control Method | Current/Voltage Mode PWM |
| Rise/Fall Time | 20ns |
| UVLO Thresholds On/Off | 9.2V / 8.4V |
Key Features
- Multi-Topology Support: The UC3825ANG4 supports various DC-DC converter topologies including Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, and Push-Pull.
- Dual Output Capability: It has two outputs that can be alternately controlled, each capable of handling up to 2A peak current.
- Advanced Protection Mechanisms: Features include pulse-by-pulse current limiting, overcurrent protection with a high-speed comparator, and soft-start capabilities.
- Low Startup Current: The IC has a low startup supply current of typically 100μA, making it suitable for off-line applications.
- Leading Edge Blanking: This feature helps reject noise inherent in switched-mode power conversion.
- High-Speed Operation: The controller can operate at switching frequencies up to 1MHz.
Applications
The UC3825ANG4 is widely used in various power management applications, including:
- DC-DC Converters: Suitable for designing Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, and Push-Pull converters.
- Power Supplies: Used in both off-line and isolated power supplies due to its robust protection features and high efficiency.
- Industrial Power Systems: Ideal for industrial power systems requiring high reliability and versatility in topology.
- Automotive Systems: Can be used in automotive power management systems due to its robustness and wide operating temperature range.
Q & A
- What is the maximum switching frequency of the UC3825ANG4?
The maximum switching frequency is 1MHz.
- What are the supported topologies for the UC3825ANG4?
The IC supports Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, and Push-Pull topologies.
- What is the operating temperature range of the UC3825ANG4?
The operating temperature range is 0°C to 70°C.
- What is the maximum duty cycle of the UC3825ANG4?
The maximum duty cycle is 50%.
- Does the UC3825ANG4 support both voltage-mode and current-mode control?
Yes, it supports both voltage-mode and current-mode control methods.
- What is the typical startup supply current of the UC3825ANG4?
The typical startup supply current is 100μA.
- What protection mechanisms does the UC3825ANG4 have?
The IC features pulse-by-pulse current limiting, overcurrent protection with a high-speed comparator, and soft-start capabilities.
- What is the package type of the UC3825ANG4?
The package type is 16-PDIP (0.300", 7.62mm).
- Is the UC3825ANG4 RoHS compliant?
Yes, the UC3825ANG4 is RoHS compliant.
- What is the maximum output current of the UC3825ANG4?
The maximum output current is 200mA with a peak current of 2A.[
