Overview
The UC2825ADWTR is a high-speed PWM (Pulse Width Modulation) controller produced by Texas Instruments. This device is part of the UC2825 family, which is optimized for high-frequency switched-mode power supply applications. It is designed to operate in either current-mode or voltage-mode systems and features input voltage feed-forward capability. The UC2825ADWTR is known for its high performance, reliability, and versatility in various power supply topologies.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | 16-SOIC (0.295", 7.50mm Width) | |
| Operating Temperature Range | -40°C to 85°C | °C |
| Supply Voltage (Vcc/Vdd) | 8.4 V to 22 V | V |
| Switching Frequency | 400 kHz to 1 MHz | Hz |
| Maximum Duty Cycle | 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 | |
| Peak Output Current | 2 A | A |
| Propagation Delay to Output | 50 ns | ns |
| Under-Voltage Lockout (UVLO) | 9.2 V / 8.4 V with hysteresis | V |
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 (1.5 A peak)
- Wide bandwidth error amplifier
- Fully latched logic with double pulse suppression
- Pulse-by-pulse current limiting
- Soft start / maximum duty cycle control
- Under-voltage lockout with hysteresis
- Low start-up current (1.1 mA)
Applications
The UC2825ADWTR is suitable for a variety of high-frequency switched-mode power supply applications, including:
- Boost converters
- Flyback converters
- Forward converters
- Full-bridge converters
- Half-bridge converters
- Push-pull converters
It is particularly useful in systems requiring high efficiency, reliability, and precision control over the output voltage.
Q & A
- What is the operating temperature range of the UC2825ADWTR?
The operating temperature range is -40°C to 85°C.
- What are the typical switching frequencies for the UC2825ADWTR?
The device can operate at switching frequencies up to 1 MHz.
- What is the maximum duty cycle of the UC2825ADWTR?
The maximum duty cycle is 50%.
- What types of power supply topologies can the UC2825ADWTR support?
The device supports boost, flyback, forward converter, full-bridge, half-bridge, and push-pull topologies.
- What is the peak output current capability of the UC2825ADWTR?
The peak output current is 2 A.
- Does the UC2825ADWTR have under-voltage lockout (UVLO) protection?
- What is the propagation delay to output for the UC2825ADWTR?
The propagation delay to output is 50 ns.
- Is the UC2825ADWTR compatible with both voltage-mode and current-mode control methods?
- What is the start-up current of the UC2825ADWTR?
The start-up current is 1.1 mA.
- Does the UC2825ADWTR have soft start and maximum duty cycle control features?
