Overview
The UCC28910D, produced by Texas Instruments, is a high-voltage flyback switcher integrated circuit designed for offline power supply applications. This device integrates a 700-V power FET and a controller, enabling primary-side regulation (PSR) without the need for an optical coupler. This approach significantly reduces component count and cost compared to traditional control schemes. The UCC28910D is particularly suited for applications requiring high power density, low standby power consumption, and robust protection features.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 85 | - | 265 | Vac |
| Maximum Switching Frequency | 105 | 115 | 125 | kHz |
| Minimum Switching Frequency | 360 | 420 | 490 | Hz |
| Power FET Breakdown Voltage | - | - | 700 | V |
| Power FET On Resistance (at 25°C) | 10.5 | 12.0 | - | Ω |
| Output Voltage Regulation Accuracy | - | - | ±5% | % |
| Output Current Regulation Accuracy | - | - | ±5% | % |
| Thermal Shutdown Temperature | - | - | 150 | °C |
| Thermal Shutdown Hysteresis | - | - | 50 | °C |
Key Features
- Primary-side regulation (PSR) without optical coupler, reducing component count and cost.
- Constant-voltage (CV) and constant-current (CC) output regulation.
- 700-V start-up and smart power management enabling <30-mW standby power.
- Valley switching and frequency dithering to ease EMI compliance.
- Thermal shutdown and low line and output over-voltage protection.
- Integrated high-voltage current source for startup, switched off during device operation.
- Dynamically adjusted controller current consumption with load.
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.
- Auxiliary power for TVs, servers, and white goods.
- LED lighting.
Q & A
- What is the input voltage range of the UCC28910D?
The input voltage range is 85 Vac to 265 Vac.
- What is the maximum switching frequency of the UCC28910D?
The maximum switching frequency is up to 115 kHz.
- What is the breakdown voltage of the integrated power FET?
The breakdown voltage of the power FET is 700 V.
- Does the UCC28910D require an optical coupler for output regulation?
No, it uses primary-side regulation (PSR) without an optical coupler.
- What are the typical applications of the UCC28910D?
Typical applications include home and building automation, power metering bias, and auxiliary power for various devices.
- What is the thermal shutdown temperature of the UCC28910D?
The thermal shutdown temperature is 150°C.
- How does the UCC28910D manage standby power consumption?
The device features smart power management that enables standby power consumption of less than 30 mW.
- What protection features are integrated into the UCC28910D?
The device includes thermal shutdown, low line and output over-voltage protection, and other built-in protection features.
- How does the UCC28910D ease EMI compliance?
The device uses valley switching and frequency dithering to ease EMI compliance.
- What is the package type of the UCC28910D?
The UCC28910D is available in a 7-SOIC package.
