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EMB1428Q: EMB1499 and EMB1428 power consumption

MMrobot
Prodigy 30 points
Part Number: EMB1428Q
Other Parts Discussed in Thread: BQ76PL455A-Q1, SN6501

I'm working on design of active BMS with EMB1499, EMB1428 and bq76PL455A-Q1.

I will use 2 x EMB1499 and 2 x EMB1428.

Battery is 48V.

I use TIDA-00817 and TIDA-00239 as reference schematics.

I want to know what current it takes from 12V and 5V supplies.

According to datasheets EMB1428: IVDD12V (12V supply current) = 125 μA; IVDD5V (5V supply current) = 180 μA;

EMB1499: VINA(12V) Quiescent Current (Operating) = 2.8 mA;

It is only few miliamps.

In reference designs it uses boost converter for 12V with up to 1amp output. Which I think is to powerfull.

I think I can use LDO (TPS7A1601) for 12V supply.

Is it good for this case?

  • 0
    TI__Genius 11480 points
    Hi MM,

    It is certainly acceptable to modify the power tree. Two "gotchas" i can think of are:

    1) Stepping the deriving the 5.3V supply from BAT16. That is a very large voltage drop for an LDO to handle.
    2)You still need a floating 12V supply, which we get from the SN6501 gate drive transformer. This will also consumer some mA's of current as it generates the isolated supply.