Texas Instruments UCC28740 | Demoboard TIDA-010000

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

• Datasheet
• IC product information