IC manufacturers Texas Instruments

IC manufacturers (99)

Texas Instruments UCC28740 | Demoboard PMP40183

UCC28740 Constant-Voltage Constant-Current Flyback Controller Using Optocoupled Feedback

Overview

TopologyFlyback Converter
Input voltage85-265 V
Switching frequency100 kHz
Output 15.05 V / 2.2 A
IC revisionPMP40183

Description

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

  • 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

Typical applications

  • USB-Compliant Adapters and Chargers for Consumer Electronics, White Goods
  • Standby Supply for TV and Desktop

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC max.
(Ω)
VersionApplicationInterface TypeGenderPins (Value)
(pcs)
MountWorking Voltage
(V (DC))
PackagingL1
(µH)
L2
(µH)
IR
(A)
IR 2
(A)
ISAT
(A)
RDC1 typ
(Ω)
RDC2 typ
(Ω)
RDC1 max
(Ω)
RDC2 max
(Ω)
fres
(MHz)
Type Samples
7447462101SPEC
8 files Active i| Production is active. Expected lifetime: >10 years.WE-TI Radial Leaded Wire Wound Inductor 100 0.8 0.8 0.65 Heat Shrinking Tube THT 7.1
744873221SPEC
8 files Active i| Production is active. Expected lifetime: >10 years.WE-DD SMT Shielded Coupled Inductor 220 0.91 1.6 0.58 220 220 0.91 0.91 1.6 0.54 0.54 0.58 0.58 2.8 Straight
632723300011SPEC
6 files Active i| Production is active. Expected lifetime: >10 years.WR-COM USB 3.1 Type C Receptacle Horizontal THR / SMT 5 USB 3.1 Type C Receptacle 24 THR 20 Tape and Reel Horizontal
Order Code Data­sheet Simu­lation
7447462101SPEC
744873221SPEC
632723300011SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC max.
(Ω)
VersionApplicationInterface TypeGenderPins (Value)
(pcs)
MountWorking Voltage
(V (DC))
PackagingL1
(µH)
L2
(µH)
IR
(A)
IR 2
(A)
ISAT
(A)
RDC1 typ
(Ω)
RDC2 typ
(Ω)
RDC1 max
(Ω)
RDC2 max
(Ω)
fres
(MHz)
Type Samples