IC manufacturers Texas Instruments

IC manufacturers (99)

Texas Instruments UCC28742

High-Efficiency Flyback Controller with 1% Output regulation accuracy

Overview

TopologyFlyback Converter
Input voltage85-265 V
Output 15.25 V / 2.1 A
IC revisionB

Description

The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-side regulated PWM controller for efficient AC-to-DC power supplies. It is an isolated-flyback power-supply controller that provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. This device processes information from opto-coupled feedback and an auxiliary flyback winding for high-performance control of output voltage and current.The UCC28742 employs advanced control algorithms to achieve high operating efficiency and performance. 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 80 kHz and always maintains control of the peak-primary current in the transformer. A minimum switching frequency of 200 Hz facilitates the achievement of low no-load input power.

Features

  • Opto-Coupled Feedback Enables up to 1% Regulation
  • Accurate Current Limit with Overload Timeout Protection and Delayed Hiccup Response
  • Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
  • 80-kHz Maximum Switching Frequency
  • Frequency Dithering to Ease EMI Compliance
  • Clamped Gate-Drive Output for MOSFET
  • Ultra-Low Start-Up Current and Large VDD Hysteresis
  • High Value Start-Up Resistor
  • Low Bias Capacitance
  • Fault Protections
  • Input Low Line
  • Output Over-Voltage
  • Over-Current
  • Short-Circuit
  • SOT23-6 Package
  • Create a Custom Design Using the UCC28742 with the WEBENCH® Power Designer

Typical applications

  • Power Supply for Cable Modem, Television, SetTop Box, and Wireless Routers, AC-to-DC Power Supply for Appliances
  • Industrial and Medical AC-to-DC Power Supplies, Smart Electricity Meters,Bias Supply for UPS, Server PSU, etc.

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesISAT
(A)
fres
(MHz)
IR
(A)
L
(µH)
RDC max.
(Ω)
VR
(V (AC))
VT
(V (AC))
MaterialL
(mm)
W
(mm)
H
(mm)
Mount Samples
768772221SPEC
8 files Active i| Production is active. Expected lifetime: >10 years.WE-TI HV Radial Leaded Wire Wound Inductor (High Voltage) 1.3 3.7 0.9 220 0.6 7.8 7.8 9.5 THT
744822233SPEC
10 files Active i| Production is active. Expected lifetime: >10 years.WE-CMB Common Mode Power Line Choke 1.5 3300 0.12 250 1500 MnZn 17.5 13 22 THT
750317658SPEC
Active i| Production is active. Expected lifetime: >10 years. Transformer
Order Code Data­sheet Simu­lation
768772221SPEC
744822233SPEC
750317658SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesISAT
(A)
fres
(MHz)
IR
(A)
L
(µH)
RDC max.
(Ω)
VR
(V (AC))
VT
(V (AC))
MaterialL
(mm)
W
(mm)
H
(mm)
Mount Samples