Zero-Power Standby PSR Flyback Controller for Automotive - UCC28730-Q1

UCC28730-Q1 (ACTIVE)

Zero-Power Standby PSR Flyback Controller for Automotive



The UCC28730-Q1 isolated-flyback power supply controller provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. A minimum switching frequency of 30 Hz facilitates achieving less than 5 mW of no-load power. This device processes information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.

An internal 700-V start-up switch, dynamically- controlled operating states and a tailored modulation profile support ultra-low stand-by power without sacrificing start-up time or output transient response. Control algorithms in the UCC28730-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.


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified with the Following Results:
    • Device Temperature Grade 1: -40⁰C to +125⁰C
    • Device HBM Classification Level 2: ±2 kV
    • Device CDM Classification Level C4B: ±750 V
  • Enables Zero-Power (< 5 mW) Standby Consumption
  • Primary-Side Regulation (PSR) Eliminates Opto-coupler
  • ±5% Voltage Regulation and Current Regulation Across Line and Load
  • 700-V Start-up Switch
  • 83-kHz Maximum Switching Frequency Enables Low Stand-by Power Charger Designs
  • Resonant-Ring Valley-Switching Operation for Highest 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

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Parametrics Compare all products in Flyback Controller

Control Method
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Special Features
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
UCC28730-Q1 UCC28700-Q1
Current    Current   
99    99   
83    132   
21/7    21/8   
HV Start-up
Low Power
Adjustable CBC
CV/CC Control
Light Load Efficiency
Soft Switching
Current Limiting
Thermal Shutdown
Green Mode
Input Line Monitor
Leading Edge Blanking
Soft Start
IoT Compatible
Power Delivery Compatible   
Adjustable CBC
CV/CC Control
Low Power
Light Load Efficiency
Error Amplifier
Soft Switching
Current Limiting
Thermal Shutdown
Green Mode
Input Line Monitor
Leading Edge Blanking
-40 to 125    -40 to 125   
SOIC    SOT-23   
Automotive    Automotive   
7SOIC: 29 mm2: 6 x 4.9(SOIC)    6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)   

Other qualified versions of UCC28730-Q1

Version Part Number Definition
Catalog UCC28730 TI's standard catalog product

WEBENCH® Designer UCC28730-Q1

 AC  DC  
AC Frequency  60 Hz  50 Hz
Use Isolated Output?
  Min   Max Range
VinRMS  V 85.00 to 480.00V
Vout  V 3.3 to 22.0V
Iout  A ≤ 10.0A
Ambient Temp  °C -40 to 125°C