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VB
Level 1
Level 1
5 sign-ins First reply posted First like given

The situation is as follows. At the input, we have a 12V power supply that has over voltage protection (OVP). A battery is connected to the output, which we charge by setting the output voltage to 13V. The problem occurs when DC/DC (TLD5190 in voltage regulator mode) works and on the output we have 13V  and than we connect a full battery, which has a voltage of, say, 13.5V, i.e. a voltage that is higher than the voltage, that is on the DC/DC output.
Then a higher voltage of 15-18V appears at the INPUT, which activates the OVP of the power supply and turns it off.

What can we do to prevent this "kick back"?

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2 Replies
Kanahaiya_K
Moderator
Moderator
Moderator
250 replies posted First question asked 50 likes received

Hello @VB ,

Please share the below-mentioned details to proceed ahead with the analysis.

1. Schematics
2. Output current
3. Switching frequency
4. Input and output voltage waveform

Regards,
Kanahaiya

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fausto_borg
Moderator
Moderator
Moderator
25 sign-ins 10 replies posted 10 likes received

Hi VB,

did you try with a blocking diode at the output?

In this case you should move the feedback resistor divider on the blocking diode's cathode.

Best regards,

Fausto

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