Overview
The UCC28910DR, produced by Texas Instruments, is a high-voltage flyback switcher designed for off-line power supplies in isolated flyback configurations. This device integrates a 700-V power FET and a controller, enabling precise output voltage and current regulation without the need for an optical coupler. The UCC28910DR utilizes primary-side regulation (PSR) by analyzing the voltage waveform on the auxiliary winding of the transformer, which significantly reduces costs compared to traditional control schemes. The device features smart power management, including a high-voltage current source for startup that is switched off during operation, and dynamically adjusted controller current consumption based on load, resulting in very low standby power consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Maximum Switching Frequency | 105-115 kHz | |
| Power FET Breakdown Voltage | 700 V | |
| Power FET On Resistance (at 25°C) | 10.5-12.0 Ω (UCC28910), 6.25-7.2 Ω (UCC28911) | Ω |
| Maximum DRAIN Peak Current | 600 mA (UCC28910), 700 mA (UCC28911) | mA |
| Output Voltage Regulation Accuracy | ±5% | |
| Output Current Regulation Accuracy | ±5% | |
| Standby Power | <30 mW | mW |
| Operating Junction Temperature Range | -55 to 150 °C | °C |
| Package | SOIC-7 (7 pins) | |
| Body Size | 5.00 mm x 6.20 mm | mm |
Key Features
- Constant-Voltage (CV) and Constant-Current (CC) output regulation without an optical coupler.
- ±5% output voltage regulation accuracy and ±5% output current regulation with AC line and primary inductance tolerance compensation.
- 700-V start-up and smart power management enabling <30-mW standby power.
- 115-kHz maximum switching frequency design for high-power density.
- Valley switching and frequency dithering to ease EMI compliance.
- Thermal shutdown and low line and output over-voltage protection.
- Discontinuous conduction mode (DCM) with valley switching to reduce switching losses.
Applications
- Home and building automation.
- Power metering bias.
- Bias power for smoke alarms, fire alarms, and thermostats.
- Wall adapters and chargers for mobile phones.
- Smart plugs, IoT, MCU, and WiFi power supplies.
- Auxiliary power for TVs, servers, and white goods.
- LED lighting.
Q & A
- What is the primary function of the UCC28910DR? The UCC28910DR is a high-voltage flyback switcher that provides output voltage and current regulation without an optical coupler.
- What is the maximum switching frequency of the UCC28910DR? The maximum switching frequency is 105-115 kHz.
- What is the breakdown voltage of the integrated power FET? The breakdown voltage of the power FET is 700 V.
- How accurate is the output voltage regulation? The output voltage regulation accuracy is ±5%.
- What is the standby power consumption of the UCC28910DR? The standby power consumption is less than 30 mW.
- What are the key protection features of the UCC28910DR? The device includes thermal shutdown, low line and output over-voltage protection, and built-in protection features to manage component stress.
- In what applications is the UCC28910DR commonly used? It is used in home and building automation, power metering bias, bias power for safety devices, wall adapters, smart plugs, and LED lighting.
- How does the UCC28910DR reduce EMI? It uses valley switching and frequency dithering to ease EMI compliance.
- What is the operating junction temperature range of the UCC28910DR? The operating junction temperature range is -55 to 150 °C.
- What package type is the UCC28910DR available in? It is available in a SOIC-7 package.
