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UCG28828

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High Frequency QR Flyback Converter with integrated GaN power FET for up to 120W output with PFC

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Data sheet

UCG28828

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Flyback Switch current limit (typ) (A) 3.5 Features Adjustable current limit, Auxless-sense, High-voltage startup, Integrated GaN FET, Over Current Protection, Over Temperature Protection, Over Voltage Protection, Self-bias, Short circuit protection, USB C/PD compatible, Under Voltage Protection, X-cap discharge EMI features Frequency Dithering, Switching slew rate control, Valley hopping Control mode Peak current mode Switching frequency (min) (kHz) 25 Switching frequency (max) (kHz) 500 Operating temperature range (°C) -40 to 105 Type Converter (Integrated Switch)
Rating Catalog Topology Flyback Switch current limit (typ) (A) 3.5 Features Adjustable current limit, Auxless-sense, High-voltage startup, Integrated GaN FET, Over Current Protection, Over Temperature Protection, Over Voltage Protection, Self-bias, Short circuit protection, USB C/PD compatible, Under Voltage Protection, X-cap discharge EMI features Frequency Dithering, Switching slew rate control, Valley hopping Control mode Peak current mode Switching frequency (min) (kHz) 25 Switching frequency (max) (kHz) 500 Operating temperature range (°C) -40 to 105 Type Converter (Integrated Switch)
VQFN (REZ) 12 25 mm² 5 x 5
  • Integrated 750V GaN with 170mΩ Rds(on) option
  • Dynamic QR/DCM/CCM modes of operation
  • High power density: up to 500kHz switching frequency
  • Enable low BoM cost by integration
    • Remove auxiliary winding with self bias
    • Integrated input and output voltage sensing
    • Integrated current sense
    • Integrated HV start-up
    • Integrated X-cap discharge
  • High efficiency and low EMI performance
    • Ultra-low standby power: <30mW
    • Frequency foldback and burst mode
    • Valley locking
    • Frequency dithering
    • Switching slew rate control
  • Comprehensive protection features
    • Overtemperature protection
    • Overvoltage protection
    • Short-circuit protection
    • Cycle-by-cycle current limit
    • Two-level over power protection with LPS
    • Brownin and brownout protection
    • Open feedback protection
  • Flexible configurability through external resistors
    • X-cap discharge and CCM mode disable
    • Selectable switching slew rate
    • Multiple clamping frequency settings
    • Fault latch or auto-restart
    • Maximum and minimum peak current ratio
    • Dithering amplitude
  • Integrated 750V GaN with 170mΩ Rds(on) option
  • Dynamic QR/DCM/CCM modes of operation
  • High power density: up to 500kHz switching frequency
  • Enable low BoM cost by integration
    • Remove auxiliary winding with self bias
    • Integrated input and output voltage sensing
    • Integrated current sense
    • Integrated HV start-up
    • Integrated X-cap discharge
  • High efficiency and low EMI performance
    • Ultra-low standby power: <30mW
    • Frequency foldback and burst mode
    • Valley locking
    • Frequency dithering
    • Switching slew rate control
  • Comprehensive protection features
    • Overtemperature protection
    • Overvoltage protection
    • Short-circuit protection
    • Cycle-by-cycle current limit
    • Two-level over power protection with LPS
    • Brownin and brownout protection
    • Open feedback protection
  • Flexible configurability through external resistors
    • X-cap discharge and CCM mode disable
    • Selectable switching slew rate
    • Multiple clamping frequency settings
    • Fault latch or auto-restart
    • Maximum and minimum peak current ratio
    • Dithering amplitude

UCG2882x is a high frequency, quasi-resonant flyback converter with built-in 750V GaN high electron mobility transistor (HEMT) with as low as 170mΩ Rds(on) for AC to DC power conversion. The UCG2882x is designed for high power density applications, such as cell phone fast chargers and notebook adapters. The key feature of this device is the self-bias and auxless sensing scheme which eliminates the need of the auxiliary winding and simplifies the system design with higher efficiency.

This device also features intelligent mode transition (CCM/QR/DCM) to enable high efficiency across wide power range and <30mW standby power consumption. In addition, UCG2882x includes a full list of protections such as brownin and brownout protection, SCP, OVP, OPP, LPS, OFB and OTP. The cycle-by-cycle current limit allows for fast response to the fault conditions to safeguard the system and improve the reliability. In a small 5×5mm package, the UCG2882x has dedicated configuration pins to offer more flexibility. Only resistors are needed to tune certain parameters for each system, enabling a platform design with a single device.

UCG2882x is a high frequency, quasi-resonant flyback converter with built-in 750V GaN high electron mobility transistor (HEMT) with as low as 170mΩ Rds(on) for AC to DC power conversion. The UCG2882x is designed for high power density applications, such as cell phone fast chargers and notebook adapters. The key feature of this device is the self-bias and auxless sensing scheme which eliminates the need of the auxiliary winding and simplifies the system design with higher efficiency.

This device also features intelligent mode transition (CCM/QR/DCM) to enable high efficiency across wide power range and <30mW standby power consumption. In addition, UCG2882x includes a full list of protections such as brownin and brownout protection, SCP, OVP, OPP, LPS, OFB and OTP. The cycle-by-cycle current limit allows for fast response to the fault conditions to safeguard the system and improve the reliability. In a small 5×5mm package, the UCG2882x has dedicated configuration pins to offer more flexibility. Only resistors are needed to tune certain parameters for each system, enabling a platform design with a single device.
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* Data sheet UCG2882x Self-Biased High Frequency QR Flyback Converter With Integrated GaN datasheet (Rev. B) PDF | HTML 24 Jul 2025
Certificate UCG28828EVM-094 EU Declaration of Conformity (DoC) 20 Aug 2025
Application note Design a Fixed Output Voltage Flyback with the UCG2882x Family of Devices PDF | HTML 15 Jul 2025

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