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UCC28731-Q1
  • UCC28731-Q1

UCC28731-Q1

ACTIVE

Automotive, Zero-power standby PSR flyback controller

Texas Instruments UCC28731-Q1 Product Info

1 April 2026 4

Parameters

Topology

Buck, Flyback

Control mode

Primary-side regulation

Features

Current limiting, DCM, Green mode, High-voltage startup, Input line monitor, Leading edge blanking, Light load efficiency, Low power, Overcurrent protection, Overtemperature protection, Primary-side regulated, Quasi-Resonant, Soft start, Thermal shutdown, Valley switching

Package

SOIC (D)-7-29.4 mm² 4.9 x 6

Features

  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40⁰C to +125⁰C
    • Device HBM classification Level 2: ±2kV
    • Device CDM classification Level C4B: ±750V
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Enables zero-power (< 5mW) standby consumption
  • Primary-side regulation (PSR) eliminates optical coupler
  • ±5% voltage regulation and current regulation across line and load
  • 700V start-up switch with 30V minimum start-up voltage
  • 83kHz maximum switching frequency enables low stand-by power charger designs
  • Resonant-ring valley-switching operation for improved overall efficiency
  • Frequency-dither to ease EMI compliance
  • Clamped gate-drive output for MOSFET
  • Over-voltage, low-line, and over-current protection functions
  • Programmable cable compensation
  • SOIC-7 package
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40⁰C to +125⁰C
    • Device HBM classification Level 2: ±2kV
    • Device CDM classification Level C4B: ±750V
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Enables zero-power (< 5mW) standby consumption
  • Primary-side regulation (PSR) eliminates optical coupler
  • ±5% voltage regulation and current regulation across line and load
  • 700V start-up switch with 30V minimum start-up voltage
  • 83kHz maximum switching frequency enables low stand-by power charger designs
  • Resonant-ring valley-switching operation for improved overall efficiency
  • Frequency-dither to ease EMI compliance
  • Clamped gate-drive output for MOSFET
  • Over-voltage, low-line, and over-current protection functions
  • Programmable cable compensation
  • SOIC-7 package

Description

The UCC28731-Q1 isolated-flyback power supply controller provides constant-voltage (CV) and constant-current (CC) output regulation without the use of an optical coupler minimizing board area plus BOM count for higher lifetime reliability. This device processes information from the primary power switch and an auxiliary flyback winding for precise regulation of output voltage and current, hence the label "PSR".

A minimum switching frequency of 32Hz facilitates achieving less than 5mW of no-load power. An internal 700V start-up switch, dynamically- controlled operating states and a tailored modulation profile support ultra-low stand-by power without sacrificing start-up time. Control algorithms in the UCC28731-Q1 allow operating efficiencies to meet or exceed applicable standards. Discontinuous conduction mode (DCM) operation with valley-switching reduces switching losses. Modulation of the switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

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