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TI UCC28740DRRoHS

Manufacturer
TI
MPN
UCC28740DR
LCSC Part #
C182073
Packaging
SOIC-7
Customer #
Key Attributes
Constant-Voltage Constant-Current Flyback Controller Using Optocoupled Feedback
Datasheetpdf iconTI UCC28740DR
In-Stock: 2,506
2,506 In stock, ships now
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QtyUnit PriceTotal Amount
1+$ 1.1514$ 1.15
10+$ 0.9755$ 9.76
30+$ 0.8778$ 26.33
100+$ 0.7573$ 75.73
500+$ 0.7085$ 354.25
1,000+$ 0.6873$ 687.30
Standard Packaging2500/Full Reel
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Products Specifications

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TypeDescription
CategoryIntegrated Circuits (ICs)/Power Management (PMIC)/AC DC Converters, Offline Switchers
ManufacturerTI
PackagingSOIC-7
Operating Temperature-40℃~+125℃
Output Current-
Frequency - Switching170Hz~100kHz
Pd - Power Dissipation-
Voltage - Breakdown700V
Voltage - Supply9V~35V
FeaturesConstant Current Mode (CC);Constant Voltage (CV);Over Voltage Protection;Over Current Protection;Overtemperature protection (OTP);Short Circuit Protection
TopologyFlyback
Output Voltage-
Duty Cycle(Max)-
Working ModeDCM
Feedback SystemSecondary-Side Feedback
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Additional Information

TypeDetails
Minimum1
Multiple1
Standard Packaging2500
Sales UnitPiece

Introduction

AI Translation

The UCC28740 isolated-flyback power-supply controller provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. Constant-Current (CC) regulation is accomplished through Primary-Side Regulation (PSR) techniques. This device processes information from opto-coupled feedback and an auxiliary flyback winding for precise high-performance control of output voltage and current.

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 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.

Features

AI Translation
  • Less than 10-mW No-Load Power Capability
  • Optocoupled Feedback for CV, and Primary-Side Regulation (PSR) for CC
  • 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 Overcurrent Protection Functions
  • SOIC-7 Package
  • Create a Custom Design Using the UCC28740 With the WEBENCH Power Designer

Applications

AI Translation
  • USB-Compliant Adapters and Chargers for Consumer Electronics
  • Smart Phones Tablet Computers Cameras
  • Standby Supply for TV and Desktop
  • White Goods