I have two questions.
1. How much is TPS7A6350-Q1 output current ?
It is 200mA on datasheet 3page. ( Does it mean continous current 200mA and peak current 300mA ? )
2. Product condition : Vin 9V(min) 12V(typ) 16V(Max), 85 degree Celsius(Max), 1 oz copper Dual layer PCB with Bat wings for enhanced heat spreading.
How much is continuous & Maximum output current value of TPS7A6350-Q1 ?
Plz help me.
The TPS7A6350QPWPRQ1 can output up to 300mA (as also shown on page 3). However, thermal limitations apply: Like every linear regulator, the "excessive voltage" is dissipated in heat. The device can support input voltages of 40V. With 5V output @ 300mA, this would cause a dissipation of 35Vx0.3A= 10.5W. A PWP-package of that size even with powerpad can not handle such dissipation. Therefore , the Thermal limits need to be observed (see top of page 3), i.e. maximum input voltage, maximum output current, ambient temperature and thermal behaviour of the board needs to be taken into account.
I understand "Product condition" listed above are the conditions you plan to use the part at?
Allowable dissipation at 85oC for a good thermal design is 1.27W (per datasheet item 2.1):
1.27W / (16Vmax -5V) = 115mA (continuous), at 12V it would be 181mA (continuous), not taking into account the quiescent-current-losses, which sligtly reduce those currents further.
The peak current can temporarily be higher, but the recommended operating conditions, in particular the maximum junction temperature of 150oC must not be exceeded at any time. The thermal impedance ratings on page 2 help to do the detailed math.
I have been looking at this component and I wonder if the "Dissipation ratings" table on p3 you refer to is correct.
The derating factor should be specified in mW/ºC, but the values in the table are thermal resistance in ºC/W ? (Like values given in p2 ?)
We have in fact according to the table (2.45-1.27)/60ºC=19.66mW/ºC derating factor !
Besides, power dissipation is usually specified at Ta=70ºC and derating apply over this temperature...
Could you double check ? Thanks,
you are correct, the derating factor is ~20mW/oC, see also Figure 35 on page 20 of the datasheet.
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