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Part Number: BQ25505
I have the following circuit:
The BYP and REF capacitors are ceramic and the remaining capacitors are electrolyte. I have made another circuit for the BQ25570 with these elements with no problem. Also, the BAT2 voltage is 3.7V, not 9V.
The problem that I have here is that the boost charger does not seem to be working.
1- The VIN_DC is the same as the solar cell Voc.
2- The VREF_SAMP voltage is zero. I tried other capacitors but made no difference.
3- The Lboost voltage is the same as the VIN_DC.
4- The VSTOR voltage is around 150mv lower than VIN_DC.
5- The VIN_DC voltage does not change every 16 seconds meaning that the MPPT is not taking samples.
6- Voltage on the C1 capacitor stays at VIN_DC and does not increase. I initially had the OK_HYST and OK_PROG pins connected to mid-point of external resistors but that did not make a difference.
I was wondering if I could get some help on what might be wrong with this circuit.
Product Marketing Engineer
Texas Instruments Inc
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In reply to Upal Patel:
I connected the VOC_SAMP pin to the mid-point of two 10MOhm resistors (between VIN_DC and ground). But the VREF_SAMP voltage is still at zero. It seems that the MPPT modulate somehow does not work at all. All the voltage measurements are the same as what I reported in the question.
In reply to Vahid Montazeri63:
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