Other Parts Discussed in Thread: BQ76930
Dear Texas Team,
I have taken reference of Tida-01093 eval Board to generate my custom schematic, but in it am facing issue @ L2 part in page 2 of power supply,
if i connect all cells C0-C20, and mount L2 in hardware , than at input of U9 chip minimum input required is 9 volts and max input required is 35vdc, so a range of 9-35vdc is to be given to U9.
Now if my all cells are @ 3.6volts, then output voltage at Q22 pin Drain pin-3 must be 3.6 * 5 = 18 volts(because of source follower ckt of Q21) , but that is not the case , i get near to 11 volts dc. Which is within range of 9-35vdc input range of U9 chip, so U9 gets ON, but after some time of functioning , the input from 11 volts reduces lesser than 9 volts, and hence my U9 gets off.
SO it seems some issue in input side of U9 chip.
Now if i remove L2 and connect power supply from outside which provided volts greater than 9vdc , to input of U9 , that time U9 works properly w/o getting off.
So please suggest where is the issue, am attaching my schematic as well for quik review.
Also please note R76 which is input to Q23 , which if made ON , i will get link to GND , but i have not made ON. Earlier i tried to made ON by applying 3.3vdc from external power supply & i merged gnd of it with my hardware gnd.
Reason for not providing input to R76 from U5 is that, unless i do not turn ON U9 my U10 do not turns ON and hence U5 can not turn ON, once U5 Turns ON it can supply output to R76 pin, so if i wait fo rU5 to turn ON, i can not turn ON my U9, hence before U5 turns ON i need to made U9 turn ON , which can be done only if i apply 3.3 to R76 from outside of Board using Power Supply.
But that is also not working.
RohitE2E Datasheet.pdf