UCC28740-Q1

ACTIVE

Automotive ultra low standby, flyback controller with integrated HV startup and optocoupler feedback

Product details

Operating temperature range (°C) -40 to 125 Control mode Secondary-side regulation Topology Flyback Rating Automotive Features Automotive qualified, Current limiting, DCM, Error amplifier, Green mode, High voltage startup, High-voltage startup, Input line monitor, Leading edge blanking, Light load efficiency, Light-load efficiency, Low power, Overcurrent protection, Quasi-Resonant, SSR, Secondary-side regulated, Soft start, Valley switching TI functional safety category Functional Safety-Capable
Operating temperature range (°C) -40 to 125 Control mode Secondary-side regulation Topology Flyback Rating Automotive Features Automotive qualified, Current limiting, DCM, Error amplifier, Green mode, High voltage startup, High-voltage startup, Input line monitor, Leading edge blanking, Light load efficiency, Light-load efficiency, Low power, Overcurrent protection, Quasi-Resonant, SSR, Secondary-side regulated, Soft start, Valley switching TI functional safety category Functional Safety-Capable
SOIC (D) 7 29.4 mm² 4.9 x 6
  • Qualified for automotive applications
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: -40.C to +125.C
    • Device HBM classification level 2: ±2 kV
    • Device CDM classification level C4B: ±750 V
  • Funcitonal Safety-Capable
  • Less than 10-mW no-load power capability
  • Enables ±1% voltage regulation and ±5% current regulation across line and load
  • 700-V startup switch
  • 100-kHz maximum switching frequency enables high-power-density charger designs
  • Resonant-ring valley-switching operation for highest overall efficiency
  • Frequency dithering to ease EMI compliance
  • Clamped gate-drive output for MOSFET
  • Overvoltage, low-line, and over current protection functions
  • Create a custom design using the UCC28740-Q1 with the WEBENCH Power Designer
  • Qualified for automotive applications
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: -40.C to +125.C
    • Device HBM classification level 2: ±2 kV
    • Device CDM classification level C4B: ±750 V
  • Funcitonal Safety-Capable
  • Less than 10-mW no-load power capability
  • Enables ±1% voltage regulation and ±5% current regulation across line and load
  • 700-V startup switch
  • 100-kHz maximum switching frequency enables high-power-density charger designs
  • Resonant-ring valley-switching operation for highest overall efficiency
  • Frequency dithering to ease EMI compliance
  • Clamped gate-drive output for MOSFET
  • Overvoltage, low-line, and over current protection functions
  • Create a custom design using the UCC28740-Q1 with the WEBENCH Power Designer

The UCC28740-Q1 isolated-flyback power-supply controller regulates the output using an optical coupler to provide fast transient response to large-load steps.

An internal 700-V startup switch, dynamically controlled operating states, and a tailored modulation profile support ultra-low standby power without sacrificing startup time or output transient response.

Control algorithms in the UCC28740-Q1 allow operating efficiencies to meet or exceed applicable standards. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controller has a maximum switching frequency of 100 kHz and always maintains control of the peak-primary current in the transformer. Protection features keep primary and secondary component stresses in check. A minimum switching frequency of 170 Hz facilitates the achievement of less than 10-mW no-load power.

The UCC28740-Q1 isolated-flyback power-supply controller regulates the output using an optical coupler to provide fast transient response to large-load steps.

An internal 700-V startup switch, dynamically controlled operating states, and a tailored modulation profile support ultra-low standby power without sacrificing startup time or output transient response.

Control algorithms in the UCC28740-Q1 allow operating efficiencies to meet or exceed applicable standards. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controller has a maximum switching frequency of 100 kHz and always maintains control of the peak-primary current in the transformer. Protection features keep primary and secondary component stresses in check. A minimum switching frequency of 170 Hz facilitates the achievement of less than 10-mW no-load power.

Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Drop-in replacement with upgraded functionality to the compared device
UCC28740 ACTIVE Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR) This is the non-automotive variant

Technical documentation

Design & development

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

Evaluation board

UCC28740EVM-525 — UCC28740EVM-525 Evaluation Module

The UCC28740EVM-525 evaluation module is a 10W off-line discontinuous mode (DCM) flyback converter that provides constant-voltage (CV) and constant-current (CC) output regulation. It uses optical coupler feedback for tight voltage regulation and improved the transient response to large load steps (...)

User guide: PDF
Not available on TI.com
Simulation model

UCC28740 SIMPLIS Transient Model (Rev. A)

SLUM672A.ZIP (122 KB) - SIMPLIS Model
Calculation tool

SLUC487 UCC28740 Design Calculator

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
UCC28740 Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR) UCC28740-Q1 Automotive ultra low standby, flyback controller with integrated HV startup and optocoupler feedback
Reference designs

PMP41009 — 350-V to 1000-V DC input, 56-W flyback isolated power supply reference design

This reference design provides isolated 14-V and 56-W outputs with a quasi-resonant flyback topology. The power supply can be powered from the 350-V to 1000-V DC input. This design uses cascode MOSFETs and flyback controller UCC28740-Q1. The line and load regulation are regulated to within ±1% (...)
Test report: PDF
Package Pins CAD symbols, footprints & 3D models
SOIC (D) 7 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos