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UCG28836

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Self-biased high-frequency QR flyback converter with integrated GaN (65W) and low standby power

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UCG28836

ACTIVO
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Detalles del producto

Rating Catalog Topology Flyback Switch current limit (typ) (A) 3.5 Features Adjustable current limit, Auxless-sense, High-voltage startup, Integrated GaN FET, Overcurrent protection, Overtemperature protection, Overvoltage protection, Self-bias, Short circuit protection, USB C/PD compatible, Undervoltage 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, Overcurrent protection, Overtemperature protection, Overvoltage protection, Self-bias, Short circuit protection, USB C/PD compatible, Undervoltage 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 HEMT
  • 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
    • Input and output 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
  • Integrated 750V GaN HEMT
  • 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
    • Input and output 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

UCG2883x/4x is a high frequency, quasi-resonant flyback converter with a built-in 750V GaN high electron mobility transistor (HEMT) with low Rds(on) for AC to DC power conversion. The UCG2883x/4x 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.

The UCG2883x/4x also features intelligent mode transition (CCM/QR/DCM) to enable high efficiency across a wide power range and <30mW standby power consumption. In addition, UCG2883x/4x 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 5mm × 5mm package, the UCG2883x/4x 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.

UCG2883x/4x is a high frequency, quasi-resonant flyback converter with a built-in 750V GaN high electron mobility transistor (HEMT) with low Rds(on) for AC to DC power conversion. The UCG2883x/4x 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.

The UCG2883x/4x also features intelligent mode transition (CCM/QR/DCM) to enable high efficiency across a wide power range and <30mW standby power consumption. In addition, UCG2883x/4x 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 5mm × 5mm package, the UCG2883x/4x 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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Documentación técnica

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* Data sheet UCG2883x/4x Self-Biased High Frequency QR Flyback Converter With Integrated GaN datasheet (Rev. B) PDF | HTML 09 abr 2026

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