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bq24650 with 10A charge current

MI
Intellectual 560 points
Other Parts Discussed in Thread: BQ24650

1. Need to design bq24650 for 10A charge current. 

Input is solar panel connected.

2. Looking at schemtic of evm I am making following changes:

Lo = 3.3uH

Co = 40uF

Sense = 10mohm

Mosfets: 2 in parallel

3. is there anything else to change? I have connected two mosfet in parallel due to high current.

  • 0
    Intellectual 560 points

    1. EVM states that by changing only Rsense current can be increased. Since I need 10A current, so I have make Rsense = 4millohm.
     Attached is schematic for same. I have removed Vsys, since i don't need that. Only charger output is required at output.

    2. Below changes are made for 10A design:
    Two diodes are made in parallel in input.(PDS1040)
    Rsense = 4milliohm.
    Two mosfet are added in parallel. (Q1 & Q2).

    3. Is there anything else to be done?

    charger.pdf

  • 0 in reply to MI
    TI__Genius 10240 points

    I would recommend the designer to go through the bq24650 datasheet first for the fundamental operation principle and requirements of the charger. The datasheet provides a lot of useful information and answers to your specific design.
    - Please refer to the datasheet page 17 and use the recommended value of inductor and output capacitor.
    - The input capacitor needs to be designed based on page 21.
    - The battery NTC resistor in parallel to R12 is missing or you need put a 10k in parallel with R12.
    - There is no MPPSET pin bias setting on the schematic – you need to set the MPPSET with resistor divider. 
    - You can add a place holder for a Schottky diode close to bq24650 from GND to PH to improve switching performance.

  • 0 in reply to ezhao
    Intellectual 560 points
    Hi ezhao,

    I am making changes accordingly. Will update the schmetaic & see if any other issue.