Hello everyone, I am currently working on a power supply circuit using the MP2451 with following parameters: Vin_range: 4,6 - 27V Vin_optimal: 12V Iout_max: 150mA Iout_min: 3mA The schematic proposed by MPS DCDC Designer is presented below: see Pic.1 The schematic used is presented below: s…

Hi m.kirejczyk, Thanks for posting on the MPSNow Forum. Your enable voltage might be falling below the Enable Up Threshold minimum. Take a look at the EC Table on page 4 of the datasheet . It states the minimum EN voltage is 1.4V. [image] From your scope captures, it looks like your Vin is ~4.2…

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MP2451 Under voltage lockout (UVLO)

DC-DC Power Converters

m.kirejczyk August 17, 2022, 1:55pm 4

Pic3

Green - input Voltage (DC)
Yellow - output voltage ripples (AC)
Conditions
I_load = 150mA