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5/17/2017 12:22 AM
 

Hello,

I'm implementing new design with MP2617B. VSYS signal is bad with battery disconnected. See picture (Green = Vin, Orange = VSYS).

 Vin = 5,12V, VSYSmax = 3,92V, VSYSmin = 2,40V, battery disconnected.

 

Without load and battery disconnected, VSYS = 3,69V even if I use SYSFB feedback to reach 4,2V (R6 = 26,7k, R7 = 10k).

Battery connected, charger works well.

 

What could happen ?

 

Best regards,

Pierre

 
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5/18/2017 7:32 AM
 

Hi Pierre,

 

Please try to add a 22uF cap on the battery pin to see if it solve the issue. If not, please share the schematic for review.

 

Thanks,

Kevin

 

 
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5/19/2017 2:09 AM
 

Hi Kevin,

There already is a 22uF capa on battery pin. I sent you the schema by personal email.

Thanks,

Pierre

 
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5/22/2017 5:31 AM
 
Hi,
For information, I replaced pull-down on #EN pin from 100k to 10k. Now it works.
Regards, Pierre
 
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