Reference Designs
Three-Phase AC and DC Input to 24V at 125mA Quick-Startup Isolated Flyback Reference Design
Texas Instruments
This design supplies an isolated 24V at 125mA from three-phase AC mains and DC input voltage. Since a maximum 70-ms startup time is necessary and the maximum input voltage is 1260 Vdc: a low-loss startup network has been developed. In order to reduce the stress on the FET: a cascode configuration has been selected. The controller features constant switching frequency and low quiescent current. A small form factor makes it suitable for electronic breaker supply.
Features
- LM5020-based isolated flyback in constant switching frequency delivering 24V at 125mA80% peak efficiency at full load and 325Vdc input voltageExtremely wide input voltage range: 56Vac to 891VacLess than 70-ms startup timeMagnetic feedback: no optocoupler is needed
Applications
- Circuit breaker (ACB
- MCCB
- VCB)
Product Categories
- Power management
End Equipment Reference Diagrams
Application Area
End Equipment
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