DFR0946 Buck-Boost goes into Protection at Start-up
xgn 2024-12-07 03:50:51 467 Views3 Replies Hello,
Bought DFR0946 DC-DC Buck-Boost converter from Mouser. Even with no Load on OUT+/OUT- the converter goes into some kind of Protection (output voltage ~3Vdc and discharges till 0V) when powered on. The supply Input voltage is 28Vdc, the Output is set to 24Vdc.
This does not happen every time, seems if the input is disconnected and connected fast again, the Output is OK (maybe capacitors have not discharged). But if it is a fresh start after some time, the module goes into Protection. Then, needed to disconnect Input fully and reconnect to boot up the converter.
Looking for ideas whether the module is defected or something I'm missing here.
If your DFR0946 Buck-Boost converter is entering protection mode during startup, this issue could be linked to several factors, including inrush current or improper component settings. The DFR0946 is a versatile converter that handles both buck and boost functions, allowing the output to remain stable even if the input voltage is above or below the desired level
Newark
CPC Farnell
.
A common issue in such power supplies is the output capacitor's inrush current during startup, especially if it's too large. When the capacitor charges, it can cause a high peak current through the inductor, which may trigger the protection mechanism if it exceeds the converter's limits
EE Power
. To mitigate this, ensure that the output capacitance is properly sized for the converter's specifications, balancing good filtering with manageable inrush current
EE Power
.
Additionally, check your input and output voltage settings and ensure that they are within the acceptable range for the converter. A mismatch in voltage settings, especially under load or at startup, can cause the module to enter protection mode
Newark
CPC Farnell
.
4o mini
Waqas.Tech 
