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reference designUCC28740 | Demoboard TIDA-010000

Texas Instruments UCC28740 | Demoboard TIDA-010000

50-W Opto-Regulated Multi-Output Flyback Converter Reference Design for 380-480VAC Motor Drives

Overview

TopologyFlyback Converter
Input voltage290-1000 V
Output 115 V / 0.67 A
Output 224 V / 1.25 A
Output 35 V / 0.1 A
Output 43.3 V / 0.1 A
Output 55 V / 2 A
IC revisionE2

Description

This reference design showcases a robust, compact, and efficient main power supply in DCM flyback topology for motor drives using the UCC28740 flyback controller. This design can work with a wide input voltage range of 290–1000 VDC delivering up to 50 W of continuous power. Multiple output rails at 24 V (1.25 A), 15 V (0.67 A), 5 V (2 A), 3.3 V (0.1 A) are available for control, gate drive, sensor, I/O, and other applications; additionally an isolated 5-V (0.1 A) output is provided for isolated communication power. The load and line regulation are within 0.5% over the entire operation range by the use of opto-regulated feedback. Key benefits of the UCC28740 device include valley switching enabling higher efficiency (>85% at 550 VDC, 50 W), internal HV FET enabling self-start without external circuitry, and frequency dithering that reduces EMI.

Features

  • Wide input range of 290-1000V DC
  • Self-start using internal 700V HC FET without any external circuitry
  • Load and line regulation < 0.5%
  • Multiple output rails - 24V(1.25A), 15V(0.67A), 5V(2A), 3.3V(0.1A) and isolated 5V(0.1A) providing 50W of output power in ambient of up to 70°C. De-rated operation up to 85°C ambient
  • Output overvoltage, output overcurrent and input undervoltage protection
  • Frequency dithering to reduce EMI

Typical applications

  • Motor diagnostics and monitoring
  • AC drive power supply module/Railway auxiliary power systems/Railway electric propulsion system

More information

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L(µH)
IR(A)
ISAT,10%(A)
RDC max.(Ω)
fres(MHz)
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Samples
7447462022
WE-TI Radial Leaded Wire Wound Inductor, 2.2 µH, 6.3 A
Simu­lation
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-TI Radial Leaded Wire Wound Inductor
Inductance2.2 µH
Rated Current6.3 A
Saturation Current @ 10%5.7 A
DC Resistance0.02 Ω
Self Resonant Frequency65 MHz
VersionHeat Shrinking Tube 
750343917
Transformer, –, –
Simu­lation–
Downloads–
Status Activei| Production is active. Expected lifetime: >10 years.
Product series Transformer
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