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Problem with Li-Ion battery charger design using a buck converter

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supersonic_ab

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hi,
I am making a Li ion battery charger and I am using a buck converter. The switching of the buck converter is done using a PMOS IRF9540 which in turn is connected to BC547 and then this BC547 is switched using Atmel Tiny13 using PWM. I am not getting the desired output... If any one could figure out the problem it will be of great help...
Thanks in advance
 

neoaspilet11

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batter charger

I would suggest you use single chip Li ion charger. Its simple and you need only one control line to your MCU.

There are a lot out there. Im using Microchip's MCP3811
 

supersonic_ab

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Re: battery charger

neoaspilet11 said:
I would suggest you use single chip Li ion charger. Its simple and you need only one control line to your MCU.

There are a lot out there. Im using Microchip's MCP3811

hey thanks for the reply and I am doing it as a project under a teacher as my internship and I need to work accordingly...
Thanks again...
 

supersonic_ab

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Re: batter charger

hey,
can anyone tell me that what is the peak to peak voltage at the output of the buck converter... I am getting the spikes in the voltage... I have used enough capacitance to reduce that spike but there is no effect... any other possible reason for the spikes??
Thanks in advance
 

D_A_V_E

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batter charger

Could you post the schematic please!
 

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