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SpeedVal Kit Half-Bridge Duty Control Questions

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jun
jun Contributor Level 1
edited October 13 in Module Products

TMDSCNCD280039C,

EVAL-ADUM4122WHB1Z,

MOD-PWR-MM-C3M0040120K,

MOD-MB-HB-0900V-40A,

MOD-ACC-BUCKBOOST-400uH

I bought that product

The duty ratio was 50% with 48v power.
Buck mode produced a 24V output.
96V came out when it was in boost mode.

Even if the duty ratio is adjusted (5-50%), the voltage does not change significantly.

May I know how much voltage regulation can be?

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Comments

  • Forum_Moderator
    Forum_Moderator Wolfspeed Employee - Contributor Level 5
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    Thank you for your post, it has been approved and we will respond as soon as possible.

  • Julius_R
    Julius_R Wolfspeed Employee - Contributor Level 2
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    Greetings:

    This evaluation platform utilizes open loop control. When running as a boost converter, if there is no load or light load and the inductor current runs in DCM or discontinuous current mode, the controller may not be able to properly regulate the output voltage. Adding load to the output will improve regulation. In boost converter mode, we recommend placing a fixed load resistor with a maximum value of 1000 ohms and sufficient power rating for the desired output voltage across the output at all times.

    Julius R

  • TBhatia
    TBhatia Wolfspeed Admin - Contributor Level 5
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    Hi, I hope that this answered your question. I will close this discussion for now but if you have a follow up question, please "Start a New Discussion" and we would be glad to support you further.

This discussion has been closed.