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UCC28750

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Current-mode flyback controller with secondary-side regulation (SSR) for offline applications

Product details

Control mode Current Features Brown Out, Cycle-by-cycle overcurrent protection, Light-load efficiency, Output short-circuit protection, Over Temperature Protection, Over Voltage Protection, Secondary-side regulated Operating temperature range (°C) -40 to 125 Rating Catalog Device type Controllers Topology Buck, Flyback
Control mode Current Features Brown Out, Cycle-by-cycle overcurrent protection, Light-load efficiency, Output short-circuit protection, Over Temperature Protection, Over Voltage Protection, Secondary-side regulated Operating temperature range (°C) -40 to 125 Rating Catalog Device type Controllers Topology Buck, Flyback
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • Stable continuous conduction mode (CCM) operation with internal slope compensation
  • Fixed-frequency operation of 65kHz or 100kHz
  • Secondary-side regulation (SSR) with opto-coupler
  • Frequency foldback and burst mode for improved light-load efficiency
  • Frequency dithering for improved EMI performance
  • Gate source/sink capability: 300mA/500mA
  • Internal 4ms soft-start
  • Robust protection features:
    • Over-voltage and Under-voltage lockout
    • Output over-power protection (OPP)
    • Output short-circuit (OSC) protection
    • Output over-voltage (OVP) protection
    • Cycle-by-cycle peak over-current limit
    • External over-temperature, over-voltage protection (OTP, OVP) and brownout detection on FLT pin
    • Internal thermal shutdown
  • Stable continuous conduction mode (CCM) operation with internal slope compensation
  • Fixed-frequency operation of 65kHz or 100kHz
  • Secondary-side regulation (SSR) with opto-coupler
  • Frequency foldback and burst mode for improved light-load efficiency
  • Frequency dithering for improved EMI performance
  • Gate source/sink capability: 300mA/500mA
  • Internal 4ms soft-start
  • Robust protection features:
    • Over-voltage and Under-voltage lockout
    • Output over-power protection (OPP)
    • Output short-circuit (OSC) protection
    • Output over-voltage (OVP) protection
    • Cycle-by-cycle peak over-current limit
    • External over-temperature, over-voltage protection (OTP, OVP) and brownout detection on FLT pin
    • Internal thermal shutdown

UCC28750 is a highly-integrated current-mode, continuous-conduction-capable, PWM controller optimized for high performance, low standby power, and cost effective offline flyback converter applications using an opto-coupler. During light-load conditions the device enters frequency foldback and burst modes, improving light-load efficiency. The burst-mode algorithm used in UCC28750 controls the minimum effective switching frequency to prevent audible noise during light-load conditions. Frequency dithering improves EMI performance, and is active in normal, frequency foldback, and power boost operations.

UCC28750 provides protection features that enable a robust converter design with minimal external components. Output over-power protection (OPP) and cycle-by-cycle over-current limit protect the load and power-stage components from electrical stress. Over-voltage and under-voltage lockout (OVLO and UVLO) prevent switching in unwanted input conditions. The FLT pin provides line brown-out sensing and protection, or external over-temperature and over-voltage protection, depending on the device variant. The FLT pin is also used to disable the device through external control by pulling the pin to ground, regardless of the device variant.

UCC28750 is a highly-integrated current-mode, continuous-conduction-capable, PWM controller optimized for high performance, low standby power, and cost effective offline flyback converter applications using an opto-coupler. During light-load conditions the device enters frequency foldback and burst modes, improving light-load efficiency. The burst-mode algorithm used in UCC28750 controls the minimum effective switching frequency to prevent audible noise during light-load conditions. Frequency dithering improves EMI performance, and is active in normal, frequency foldback, and power boost operations.

UCC28750 provides protection features that enable a robust converter design with minimal external components. Output over-power protection (OPP) and cycle-by-cycle over-current limit protect the load and power-stage components from electrical stress. Over-voltage and under-voltage lockout (OVLO and UVLO) prevent switching in unwanted input conditions. The FLT pin provides line brown-out sensing and protection, or external over-temperature and over-voltage protection, depending on the device variant. The FLT pin is also used to disable the device through external control by pulling the pin to ground, regardless of the device variant.

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Technical documentation

Design & development

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Evaluation board

UCC28750EVM-071 — UCC28750 evaluation module for current-mode flyback controller

The UCC28750EVM-071 is a 60-W evaluation module for evaluating an off-line AC to DC power converter. The UCC28750EVM-071 is intended for evaluation purposes and is not intended to be an end product. The UCC28750EVM-071 converts 85-VRMS to 265-VRMS input voltage down to 24 VDC, capable of delivering (...)
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Calculation tool

UCC28750-CALC Excel calculator tool for the UCC28750 Flyback controller

The UCC28750 Excel calculator helps build the schematic design and accelerate the design process.
Supported products & hardware

Supported products & hardware

Products
Flyback controllers
UCC28750 Current-mode flyback controller with secondary-side regulation (SSR) for offline applications
Simulation tool

UCC28750-SIMPLIS UCC28750 Flyback Controller SIMPLIS Model

The UCC28750 SIMPLIS model helps build the schematic design and accelerates the design process.
Supported products & hardware

Supported products & hardware

Products
Flyback controllers
UCC28750 Current-mode flyback controller with secondary-side regulation (SSR) for offline applications
Package Pins Download
SOT-23 (DBV) 6 View options

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