Hello,
Currently I am using the Eval Board of MP4581 (EV4581-N-00A) in that i need to use the undevoltage cutoff feature. By changing the R5 & R6 Value to (1M & 27.4K). When the EN Voltage is reduced below 1.13V the buck converter is turned off during that time it consuming around 300µA. I need to know that, this much of current consumption is normal and How to reduce the current consumption.
Hi @aakash.k ,
You may refer to the ‘Power Supply’ section on page 4 of the MP4581 datasheet.
You may match these conditions to achieve lower current draw.
Best, Will
Hello @will,
In my condition my Vin Voltage is 47V, VEn Voltage is 0.9V at that time my current consumption was around 300uA.
In my actual case also, I need to turn off the buck convertor if the input voltage is below 48V.
You are setting the EN voltage between thresholds.
See datasheet EC Table for EN thresholds:
I suggest measuring input current with EN set to zero, and then with EN above 1.35V (try 1.5V for margin).
Using a resistor divider off of Vin for UVLO function is tricky if you need low current draw. Note ‘Micro-power EN off threshold’ is specified as 0.4V.
Can you trigger EN externally?
Best, Will
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