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TPS92624-Q1: TPS92624-Q1

hitainder kaswan
Prodigy 120 points
Part Number: TPS92624-Q1

Tool/software:

Dear Ti Team,

We are using below LED Driver.

input : 10V to 18V, output 5Volt LED.

output 200mA /per channel current 50mA 

output 400mA /per channel current 100mA 

output 600mA /per channel current 150mA 

R1, R2, R3, R4 are current setting resistance.

we are using 0402 package 60mW resistance in current setting, is 60mW is sufficient or we need more power resistance. 0603 package power 100mW & 0805 package power 250mW

  • 0
    TI__Expert 5790 points

    Hello,

    Do you need to know the resistor power limit for each current output? You will need multiple drivers with different Resistor values for current sensing in order to achieve the specifications listed

  • 0 in reply to Daniel Louis
    TI__Expert 3205 points

    Hello Daniel,

    The customer want to know if suppose for all 4 channels to get 600mA load output they will say use maximum capacity of TPS92624-Q1 which is 150mA per channel and accordingly for setting say different different current out for same IC they will select resistor setting accordingly.

    Now, the question is if say at max out of 150mA per channel they are using say "Rx" valued resistor of 0603 package to support the dissipated heat will for the same current setting can 0402 package resistor work here (this doubt is coming to reduced down to cost on package being used), for 0402, 60mW is allowable power dissipation so that it doesn't get derate within these limits.

    Let the customer know whether 0402 can be used here or you recommend to go for some other package with more allowable power dissipation?

    Regards,

    Jinesh

  • 0 in reply to Jinesh Todawat
    TI__Expert 5790 points

    Hi Jinesh,

    The rule of thumb is to scale your resistors to take twice the expected power. Please keep in mind that resistors can tolerate a lot more power dissipation than many components on the board. Also, if they get hot enough, you have to make sure your board material (such as FR4) can actually withstand the heat dissipation. Additionally, please account for the temperature range that the board will need to withstand while incorporating the added heat from the resistors.