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The UCC2891x high voltage flyback switch is specifically designed to isolate flyback power supplies and provide output voltage and current regulation without the need for an optocoupler. This article mainly introduces the UCC2891x features, application range, reference design circuit and circuit analysis to help you shorten the design time.

UCC2891x features: ±5% output voltage regulation accuracy; 115kHz maximum switching frequency for high power density design; low voltage line and output overvoltage protection; thermal shutdown

Typical application range of UCC2891x: DC and AC adapter, mobile phone, tablet and camera charger; power calculation; TV standby switch mode power supply (SMPS), server, large appliances; LED driver

UCC2891x reference design application circuit:

Figure 1 UCC2891x internal structure diagram

TheUCC28910 and UCC28911 are high-voltage flyback switchers that provide output voltage and current regulation without the use of an optical coupler.

Figure 2UCC2891x reference design

UCC28910andUCC28911are HV switchers dedicated to an off-line power supply in an isolated flyback configuration. HV switcher means that each device integrates the power switch, a 700-V power FET, with the control logic. The two devices have the same control logic and they Are different only for the Power FET RDS(on) and for the operating current levels.

UCC28910 Chinese data sheet: Click to download

More schematics and source code popular application circuit: click now

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August 20, 2023