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Power supply to MSP430 microcontroller in MPPT based solar charge controller

BALKRISHNA TULSYAN
Intellectual 850 points
Other Parts Discussed in Thread: INA138, LM5019

hi

Can anyone clarify as why power to INA138 AND MSP430 microcontroller in PMP7605 MPPT charge controller reference design has been supplied from SOLAR panel end and not through battery end.

If it is supplied through panel end, then how can it provide power to microcontroller and ina138 current sensor during night time. why can't we simply supply power through battery. Is there anything i am missing out here??

Please find the schematic in the attachment and go through power supply design using LM5019.tidr393_SCHEMATIC.pdf

  • 0
    TI__Intellectual 820 points

    PMP7605 REVC uses the SM72295MA bridge to charge the battery from a solar panel. Bias power to all circuitry (10V and 3.3V) is derived from the LM5019 buck and TLV70433 linear regulator, respectively. Bias power receives its input voltage from P+ (panel) as you state. This reference design is a MPPT converter that solely charges the battery and is not intended to operate with insufficient solar input. Its possible to implement it as you suggest by diode OR'ing the battery voltage and the Panel voltage together to power the LM5019 buck. This would allow the higher of the two voltages to supply bias power continuously, but would draw power from the battery at night. At night the circuit would continue to operate, but does not perform any additional functions.