Electronics > Projects, Designs, and Technical Stuff
Boost converter voltage drop
fedimakni:
Hello
I used both the TPS610986 and TPS61291 boost converter in order to power a load that consume around 200mA in both situation (TPS610986 powering the load then use the TPS61291 to power the same load) the boost converter voltage drop down to around 0.45V. Both of them work correctly with load that consume 10-20mA but with higher load the voltage drop down i didn't understand the reason as the datasheet mention that both could work fine by supplying 200mA. ( I also tried a load that consume 100mA but i faced the same problem)
Input voltage: 3V
Output voltage: 3.3V
Could you please tell me how to fix it.
Thanks
PS: attached the schematic of both boost converter that I used
EEEnthusiast:
for the TPS610986 , the recommended cap from VSUB to GND is 10uF whereas your schematic uses 1uF.
Can you also check with lowering the input voltage. Some boost converters behave strange when the output voltage is close to input.
fedimakni:
I am not using the Vsub as the mode pin is tied to ground. so it's deactivated. and the same problem occur with the second boost converter.
Even with 2V input voltage i still face the same problem
EEEnthusiast:
can you tell the part number for the inductors used?
fedimakni:
VLS252010HBX-4R7M-1 for the TPS610986
MDMK2020T3R3MM for the TPS61291
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