ADP2291 dont indicate for charging the battery

Hi Folks,

I am Using the ADP2291 . I have two circuits parallel which they are Isolated with BAT1000 to support the system .

 I am using Sanyo Battery 18650(4.1~3.7 V ,2800mA).

I used the application circuit with HERMAL PROTECTION, figure 25 on data sheet .

The only difference is RS value which is 0.15 ohm to increase the charging current at the beginning .

Single circuit ,(100% Discharged Batt)Power up the circuit will draw 1500 mA as expected . after 10 minutes Led goes to off mode. Input current draw by source is reaching to 400 ma after 15 min .  I expect to charging continue for at least 2 hours with approximately 1300 mA  to full charge the battery .

input voltage is 5.04 v---4.74 V is the voltage before on RS In-Pin  ,100 mV drops cross the RS .  VCE = 0.922 ---VB =3.74V

V ADJ = 2.145v

V CHG = 3.69  ,V between the Resistor and LED is 3.69 V ...No current drawn .

Note : I placed the NTC close to the Pin of the Batt . Temp of the battery is not exceed the 95 degree F (Measured )

 Why the circuit goes to shutdown status very quick ?

Picture is attached .

Thanks for Help

Ash

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  • 0
    •  Analog Employees 
    on Nov 17, 2016 3:27 AM

    Hi Ash,

    Sorry for the late response. Would you try the followings for debugging?

    1) Increase the input voltage to 12V. Is the problem still there?
    2) will it work if you use single ADP2291 charger to battery?
    3) Try to use a normal resister instead of NTC resister as the impedance may vary a lot with different beta and type. 

    Thanks,

    Hong

Reply
  • 0
    •  Analog Employees 
    on Nov 17, 2016 3:27 AM

    Hi Ash,

    Sorry for the late response. Would you try the followings for debugging?

    1) Increase the input voltage to 12V. Is the problem still there?
    2) will it work if you use single ADP2291 charger to battery?
    3) Try to use a normal resister instead of NTC resister as the impedance may vary a lot with different beta and type. 

    Thanks,

    Hong

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