This user's guide provides direction on how to operate and evaluate the UCC28781EVM-053 for various performance metrics. The UCC28781EVM-053 implements a typical application for a high-voltage, wide-Vin, single output ZVSF power converter operating from 50 V to 500 V DC input to produce a 15-V output rail for up to 4 A of load current. The EVM includes a means to operate from the standard world-wide AC input range of 90 VRMS to 264 VRMS, as well.
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The UCC28781EVM-053 is a 60-W, 15-V evaluation module (EVM) featuring the UCC28781-Q1 controller for evaluating a high-voltage DC-input zero-voltage-switching flyback (ZVSF) converter for use as a bias supply in traction inverters and other applications. The EVM is intended for evaluation purposes and is not intended to be an end product.
The EVM converts a DC input voltage range of 50 V to 500 V down to an isolated output of 15 V. Output current is rated for a maximum of 4 A for input voltages between 250 V and 500 V, and derated to a maximum of 2 A for input voltages between 50 V and 250 V. An over-power capability of up to approximately 133% of rated power is limited to a duration of 160 ms.
Alternatively, the EVM can be powered from an isolated AC source with voltages between 90-VRMS to 264-VRMS by connecting the rectified-AC section to the DC input as presented later in this user guide.
Always follow TI’s setup and application instructions, including use of all interface components within their recommended electrical rated voltage and power limits. Always use electrical safety precautions to help ensure your personal safety and those working around you. Contact TI's Product Information Center http://support/ti./com for further information.
Save all warnings and instructions for future reference.
Failure to follow warnings and instructions may result in personal injury, property damage or death due to electrical shock and burn hazards.
The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed printed circuit board assembly. It is intended strictly for use in development laboratory environments, solely for qualified professional users having training, expertise and knowledge of electrical safety risks in development and application of high voltage electrical circuits. Any other use and/or application are strictly prohibited by Texas Instruments. If you are not suitable qualified, you should immediately stop from further use of the HV EVM.
While the EVM is energized, never touch the EVM or its electrical circuits, as they could be at high voltages capable of causing electrical shock hazard.
Limitation for safe use:
EVMs are not to be used as all or part of a production unit.