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UCC28740DR

CVCC Flyback Controller, 700V startup, opto feedback, <10mW no-load, SOIC-7

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Manufacturer Part：

UCC28740DR

Package：

SOIC-7 (4.9 x 3.9 x 1.75 mm)

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Description

Product Overview

The UCC28740DR from Texas Instruments is a constant-voltage, constant-current (CVCC) flyback controller using optocoupled feedback for secondary-side voltage regulation and primary-side regulation (PSR) for constant current. It features a 700V startup switch, valley-switching operation, and less than 10mW no-load power consumption in an SOIC-7 package.

Key Specifications

Topology Flyback (isolated)
Control Mode Secondary-side regulation (CV), PSR (CC)
Startup Switch Voltage 700V
Switching Frequency 170Hz to 100kHz
Max Duty Cycle 99%
Bias Voltage Range 8.1V to 35V
No-Load Power <10mW
Voltage Regulation +/-1%
Current Regulation +/-5%
Operating Temperature -40C to +125C
Package SOIC-7

Features

  • 700V internal startup switch
  • Optocoupled feedback for CV, PSR for CC regulation
  • Less than 10mW no-load power
  • +/-1% voltage regulation, +/-5% current regulation
  • Valley-switching for highest efficiency
  • Frequency dithering for EMI compliance
  • Clamped gate-drive output for MOSFET
  • Overvoltage, low-line, and overcurrent protection

Applications

  • USB charger and adapter power supplies
  • Industrial AC-DC power supplies
  • EV service equipment chargers
  • Set-top box and networking power
  • Appliance power supplies

The UCC28740DR from Texas Instruments is a constant-voltage, constant-current flyback controller designed for isolated power supply applications. It combines optocoupled secondary-side regulation for precise voltage control (+/-1%) with primary-side regulation for current control (+/-5%). The internal 700V startup switch and dynamically controlled operating states support less than 10mW no-load power. Valley-switching and frequency dithering optimize efficiency and EMI performance. The SOIC-7 package enables compact charger and adapter designs.

The UCC28740DR implements a quasi-resonant flyback control scheme. The 700V startup switch charges the VDD capacitor from the rectified AC input. Once VDD reaches the run threshold, the controller begins switching the external MOSFET. Constant-voltage regulation uses an optocoupler feedback path where the FB pin current determines switching frequency and peak primary current. Constant-current regulation uses primary-side sensing through the VS pin, which monitors the auxiliary winding voltage during the flyback period. Valley-switching detects the MOSFET drain voltage resonant ring and turns on at the voltage minimum to reduce switching losses. Frequency dithering spreads the switching harmonic spectrum for easier EMI compliance.

Pin Name Type Function
1 VDD Power Bias supply input (8.1-35V)
2 VS Input Voltage sense from auxiliary winding
3 FB Input Feedback input from optocoupler
4 CS Input Current sense input from sense resistor
5 DRV Output Gate drive output for MOSFET
6 GND Power Ground
7 HV Input High-voltage startup input (up to 700V)
  • USB Type-C and PD charger power supplies
  • Industrial limited power source AC-DC converters
  • EV service equipment (Level 1 and 2 charger) power
  • Set-top box and networking equipment power
  • Appliance and white goods auxiliary power
Manufacturer Part Number Package Notes
Texas Instruments UCC28700DR SOIC-7 PSR-only version (no opto)
Texas Instruments UCC28740QDRQ1 SOIC-7 Automotive AEC-Q100 qualified
Power Integrations INN3679C-H603 InSOP-24 Integrated MOSFET CVCC flyback
onsemi NCP1342AMDCD1AAG TSOP-6 QR flyback controller
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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