Other Parts Discussed in Thread: LMR36015
Hi!
I'm using a LMR36015FSC3RNXRQ1 in classic circuit configuration
Due the shortage of PMIC, we ar try to use a 3V3 regulator with feedback resistors, to obtain a 14Vdc required by our circuit
The output voltage is correct. We have problem with IC power dissipation. Without or with a light load (for example 2K2 on 14Vdc) the power
dissipated by IC is about 1W
We measure, without load, 14Vdc on output, with 30Vdc in input and 30mA current in input! So without load the circuit use about 1W of power
We try to remove the feedback resistors, so we have on output 3V3. But the inrush current is light lower, but still high (about 20mA). So I think the problem
is not on required rising output voltage for the 3V3 device.
We change also the inductor, lowering it to 10uH and 4.7uH... but (about) nothing change in input power used, still without load (and also with lights load)
Rising the load on output, the circuit still work (mantain 14Vdc on output and supply the required current). But the power required in input is still about +1W that output
There is some solution to lower the power requirement (and for this the heat on the IC) ?
Thanks!