I have this AD84064 buck power supply (12V cigarette lighter to 5VDC USB adapter). This thing is pretty useless as the cigarette plug is no good for American cars, it's a bit too thin and I have other ones that fit fine. Anyway I was thinking about modding this so that I can use it for a 6V battery. However I can't seem to find the dropout voltage of this SMPS chip - I suppose I can experimentally find it, but wonder if anyone knew?
The datasheet is in simplified Chinese, and I can't seem to find a dropout voltage. I'm guessing that to be able to turn on the switch, much like the MC34063, need 2 transistor E-B drops above the output voltage - so the dropout would be 1.4V...
This is fine for 12V car voltage but I would like to run at 6V (3 Sealed Lead Acid cells), and hence there may not be enough voltage/too much drop to turn on the switch for a 5.1V output. At 5.1+1.4V it would be ~6.5 volts minimum which may be hard for a 6V SLA to maintain through the whole discharge cycle (6.9V fully charged standby voltage to 6.0V when just about discharged?).
Any suggestions?
The datasheet is in simplified Chinese, and I can't seem to find a dropout voltage. I'm guessing that to be able to turn on the switch, much like the MC34063, need 2 transistor E-B drops above the output voltage - so the dropout would be 1.4V...
This is fine for 12V car voltage but I would like to run at 6V (3 Sealed Lead Acid cells), and hence there may not be enough voltage/too much drop to turn on the switch for a 5.1V output. At 5.1+1.4V it would be ~6.5 volts minimum which may be hard for a 6V SLA to maintain through the whole discharge cycle (6.9V fully charged standby voltage to 6.0V when just about discharged?).
Any suggestions?
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