Overview
The UCC28881DR, produced by Texas Instruments, is a 700-V, low quiescent current off-line switcher integrated into a single monolithic device. This device combines a controller and a 14-Ω, 700-V power MOSFET, along with a high-voltage current source. This integration enables the device to start up and operate directly from the rectified mains voltage, making it highly efficient and suitable for various AC-to-DC converter topologies such as buck, buck-boost, and flyback. The low quiescent current of the device contributes to excellent efficiency, especially in standby modes.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Maximum Input Voltage (HVIN) | 700 | V |
| Maximum Drain Voltage | 700 | V |
| Maximum Drain Current (Positive) | 770 | mA |
| Maximum Drain Current (Negative) | -700 | mA |
| Feedback Voltage Range | -0.3 to 6 | V |
| VDD Voltage Range | -0.3 to 6 | V |
| Junction Temperature Range | -65 to 150 | °C |
| Storage Temperature Range | -65 to 150 | °C |
| Quiescent Current | < 100 μA | |
| Switching Frequency | Up to 62 kHz | |
| Package Type | 7-Pin SOIC | |
| Operating Temperature Range | -40 to 125 | °C |
Key Features
- Integration of a controller and a 14-Ω, 700-V power MOSFET into one monolithic device.
- High-voltage current source for start-up and operation directly from rectified mains voltage.
- Low quiescent current (<100 μA) for excellent efficiency.
- Supports buck, buck-boost, and flyback converter topologies.
- Soft-start feature for controlled start-up of the power stage, minimizing stress on components.
- Robust current protection including current limit, overload, and output short circuit protection.
- Thermal shutdown and under-voltage lockout (UVLO) protection.
- Operation in continuous conduction mode (CCM) or discontinuous conduction mode (DCM).
Applications
The UCC28881DR is suitable for various AC-to-DC power supply applications, including:
- Non-isolated buck converters with output currents up to 225 mA in CCM and 150 mA in DCM.
- Buck-boost and flyback converters with low standby power.
- LED drivers in low-side buck and buck-boost configurations.
- General-purpose AC-to-DC switching converters where high efficiency and low quiescent current are critical.
Q & A
- What is the maximum input voltage for the UCC28881DR?
The maximum input voltage (HVIN) is 700 V.
- What are the supported converter topologies for the UCC28881DR?
The device supports buck, buck-boost, and flyback converter topologies.
- What is the quiescent current of the UCC28881DR?
The quiescent current is less than 100 μA.
- Does the UCC28881DR have built-in protection features?
Yes, it includes current limit, overload protection, output short circuit protection, thermal shutdown, and under-voltage lockout (UVLO).
- What is the operating temperature range for the UCC28881DR?
The operating temperature range is -40°C to 125°C.
- Can the UCC28881DR operate in both CCM and DCM modes?
Yes, the device can operate in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM).
- What is the maximum switching frequency of the UCC28881DR?
The maximum switching frequency is up to 62 kHz.
- What package type is the UCC28881DR available in?
The device is available in a 7-Pin SOIC package.
- Is the UCC28881DR RoHS compliant?
Yes, the UCC28881DR is RoHS compliant.[
- What is the typical application for the UCC28881DR in terms of output current?
The device can deliver output currents up to 225 mA in CCM and 150 mA in DCM for non-isolated buck converters.[
