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Texas Instruments UCC28911
700V Flyback Switcher with Constant-Voltage Constant-Current and Primary-side Regulation
Overview
| Topology | Flyback Converter |
| Input voltage | 88-265 V |
| Switching frequency | 105-125 kHz |
| Output 1 | 5 V / 1.2 A |
| IC revision | D |
Description
The UCC28910 and UCC28911 are high-voltage flyback switchers that provide output voltage and current regulation without the use of an optical coupler. Both devices incorporate a 700-V power FET and a controller that process operating information from the flyback auxiliary winding and power FET to provide a precise output voltage and current control. The integrated high-voltage current source for startup that is switched off during device operation, and the controller current consumption is dynamically adjusted with load. Both enable the very low stand-by power consumption.Control algorithms in the UCC28910 and UCC28911, combining switching frequency and peak primary current modulation, allow operating efficiencies to meet or exceed applicable standards. Discontinuous conduction mode (DCM) with valley switching is used to reduce switching losses. Built-in protection features help to keep secondary and primary component stress levels in check across the operating range. The frequency jitter helps to reduce EMI filter cost.
Features
Constant-Voltage (CV) and Constant-Current (CC) Output Regulation Without Optical-Coupler±5% Output Voltage Regulation Accuracy±5% Output Current Regulation With AC Line and Primary Inductance Tolerance Compensation700-V Start-Up and Smart Power Management Enables <30-mW Standby Power115-kHz Maximum Switching Frequency Design for High-Power DensityValley Switching and Frequency Dithering to Ease EMI ComplianceThermal Shut DownLow Line and Output Over-Voltage Protection
Typical applications
- Aux power for TV, Server, White Goods
- Power Metering Bias
- Smart plug, IoT, MCU and WiFi Power
- Bias Power for Smoke Alarm, Fire Alarm and Thermostat
- Home and Building Automation
- LED Lighting
- Wall Adapters, Chargers for Mobile Phones
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | ISAT,10%(A) | fres(MHz) | Version | ISAT(A) | VIN | VOut1(V) | IOut1(A) | Vaux(V) | fswitch(kHz) | NPRI : NSEC : NAUX | Size | IR(A) | L(µH) | RDC max.(Ω) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-TI HV Radial Leaded Wire Wound Inductor (High Voltage), 0.55 A, 1.8 MHz | Status Activei| Production is active. Expected lifetime: >10 years. | Saturation Current @ 10%0.55 A | Self Resonant Frequency1.8 MHz | VersionStandard | Saturation Current0.55 A | – | – | – | – | – | – | Size8095 | Rated Current0.5 A | Inductance1000 µH | DC Resistance2.08 Ω | – | – | MaterialNiZn | Length7.8 mm | Width7.8 mm | Height9.5 mm | MountTHT | |||||
 | WE-TI Radial Leaded Wire Wound Inductor, 8.5 A, 140 MHz | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | Saturation Current @ 10%8.5 A | Self Resonant Frequency140 MHz | VersionHeat Shrinking Tube | Saturation Current8 A | – | – | – | – | – | – | Size5075 | Rated Current8.5 A | Inductance1 µH | DC Resistance0.015 Ω | – | – | – | Length6 mm | Width6 mm | Height8.5 mm | MountTHT | ||||
 | WE-CMB Common Mode Power Line Choke, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMB Common Mode Power Line Choke | – | – | VersionTHT | – | – | – | – | – | – | – | SizeType S | Rated Current1 A | Inductance10000 µH | DC Resistance0.36 Ω | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length17.5 mm | Width13 mm | Height22 mm | MountTHT | ||||
 | WE-OLTI Offline Flyback Transformers, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLTI Offline Flyback Transformers | – | – | – | Saturation Current0.65 A | Input Voltage 85 - 265 V (AC) | Output Voltage 15 V | Output Current 11.2 A | Auxiliary Voltage17 V | Switching Frequency 115 | Turns Ratio16.5:1:3.5 | SizeEE16/8/5 | – | Inductance1100 µH | – | – | Insulation Test Voltage4500 V (AC) | – | Length20.32 mm | Width24.38 mm | Height16 mm | MountTHT |