Product details

Control mode Primary-side regulation Frequency (Max) (kHz) 83 UVLO thresholds on/off (V) 21/7 Duty cycle (Max) (%) 99 Features PSR, DCM, HV Start-up, Low Power, Light Load Efficiency, Current Limiting, Thermal Shutdown, Green Mode, Input Line Monitor, Leading Edge Blanking, Soft Start, Automotive Qualified Operating temperature range (C) -40 to 125 Rating Automotive TI functional safety category Functional Safety-Capable Device type Controllers Topology Buck, Flyback
Control mode Primary-side regulation Frequency (Max) (kHz) 83 UVLO thresholds on/off (V) 21/7 Duty cycle (Max) (%) 99 Features PSR, DCM, HV Start-up, Low Power, Light Load Efficiency, Current Limiting, Thermal Shutdown, Green Mode, Input Line Monitor, Leading Edge Blanking, Soft Start, Automotive Qualified Operating temperature range (C) -40 to 125 Rating Automotive TI functional safety category Functional Safety-Capable Device type Controllers Topology Buck, Flyback
SOIC (D) 7 29 mm² 4.9 x 6
  • AEC-Q100 Qualified for Automotive Applications:
    • Device Temperature Grade 1: –40⁰C to +125⁰C
    • Device HBM Classification Level 2: ±2 kV
    • Device CDM Classification Level C4B: ±750 V
  • Functional Safety-Capable
  • 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 with 30-V Minimum Start-up Voltage
  • 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
  • AEC-Q100 Qualified for Automotive Applications:
    • Device Temperature Grade 1: –40⁰C to +125⁰C
    • Device HBM Classification Level 2: ±2 kV
    • Device CDM Classification Level C4B: ±750 V
  • Functional Safety-Capable
  • 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 with 30-V Minimum Start-up Voltage
  • 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

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 achieves 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.

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 achieves 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.

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Technical documentation

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Type Title Date
* Data sheet UCC28730-Q1 Zero-Power Standby PSR Flyback Controller for Automotive datasheet (Rev. B) 30 Nov 2020
Application note UCC28730-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA 18 Aug 2020
Application note Increase Traction Inverter System Robustness With a HV to LV Backup Supply (Rev. B) 09 Oct 2019
Application note Minimize Standby Consumption for UCC287XX Family 01 Aug 2019
White paper Driving the future of HEV/EV with high-voltage solutions (Rev. B) 16 May 2018
User guide Using the UCC28730EVM-552 10-W Adaptor Module With PSR and Wake-Up Monitor 06 Feb 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

UCC28730EVM-552 — UCC28730 Primary Side Flyback Controller with UCC24650 Secondary Side Wake Up

The UCC28730EVM-552 evaluation module is a 10-W off-line discontinuous mode (DCM) flyback converter that provides constant-voltage (CV) and constant-current (CC) output regulation without the use of an optical coupler.  The primary side controller detects a wake-up signal from the secondary (...)

In stock
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Simulation model

UCC28730 & UCC24650 PSpice Transient Model

SLUM527.ZIP (103 KB) - PSpice Model
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
Calculation tool

UCC28730 Design Calculator (Rev. A)

SLUC579A.ZIP (77 KB)
Reference designs

PMP22288 — 15-W flyback reference design for automotive inverter power

his reference design uses the UCC28730-Q1 flyback controller to produce an isolated 15-V output. The design is capable of 0.33 A from a 40-V to 250-Vdc input and 1 A from a 250-V to 550-Vdc input. This power system is designed for an inverter bias supply application and is an automotive-qualified (...)
Reference designs

PMP22557 — High voltage buck converter reference design for E-motorcycle BMS applications

This non-isolated buck converter provides a fixed output of 12V at 400mA for BMS applications. It operates over an input voltage range of 50Vdc – 150Vdc after a startup greater than 40V. Operating in discontinuous conduction mode (DCM), this converter utilizes the UCC28730 controller, which is (...)
Reference designs

PMP22487 — High voltage buck converter reference design for BMS applications

This non-isolated buck converter provides a fixed output of 14 V at 130 mA for BMS applications. It operates over an input voltage range of 18 Vdc – 144 Vdc after a startup greater than 23 V. Operating in discontinuous conduction mode (DCM), this converter utilizes the UCC28730 controller (...)
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