Other Parts Discussed in Thread: TPS61041
Tool/software:
Hi, I have used TPS61040DBVR to deliver 6V to the transistor on board powered with 3V battery. The transistor is used as a switch for my circuit. Once I put in the battery the circuit works fine for a while, but then there is low frequency humming sound coming from the input capacitor 4.7uF and then the circuit stops. I have also observed flickering of the LEDs when the humming sound occurs. To debug this I have used the multimeter and to my surprise the capacitor seems shorted(durring the humming sound) also there is short between the 6V and the GND. So I removed the battery and checked if there is shorted wire or something. The inductor (input 3.3uH) is shorted. My question is : isn't the inductor would be shorted( since it's coil of wire)? Another question is how to make the circuit working, whenever I insert the battery I observe short between 6V and ground which is ultimately failing my whole circuit.
I have followed the circuit diagram from it's datasheet tps61041.pdf and also followed the layout. My other guess is that I have used very small packages for the capacitor and resistors(smallest size 0402, the capacitor is 0805) that have caused fabrication error or may be the traces are too close to each other and causing short because they can't handle amount of current and voltage(although the load is too low the Io = 25mA from the TPS61040DBVR). I would appreciate if there is any recommendation on packages sizes as well.
