Linked Questions
10 questions linked to/from Correct Placement of Series Ferrite Beads to Avoid DC Disconnect During Power Cycling
15
votes
5
answers
3k
views
5V LDO blowing up only when testing current draw
I have a circuit to power some 5-volt logic from a +24VDC source. It has some basic reverse-polarity protection and uses a TI 5VDC LDO.
It all works great during normal operation however, when I use ...
- 151
15
votes
3
answers
2k
views
Why did my DC/DC Buck Circuit fail?
I'm in the process of debugging a PCB I made. On this board, a 24V input feeds through a DC/DC buck circuit (based around the TI TPS54202DDC) to output 11V, then an LDO to output 9V (to ensure a very ...
- 671
5
votes
10
answers
930
views
Automotive Controller LDO Failures
I've designed an automotive lighting controller for two LED pucks, powered from the vehicle's ignition with a headlight signal input. The circuit uses a UA78L05AC 5V LDO to power an ATTINY 8-bit MCU.
...
- 95
6
votes
3
answers
2k
views
Buck Converter dies unpredictably upon connecting power
I made a PCB for an ESP32-based solenoid controller that is powered by a 24V DC Jack. I'm using an AP63205 Buck Converter to step that input down to 5V DC, and then a linear 3V3 LDO to power the ESP32....
1
vote
2
answers
477
views
DC/DC buck regulator regularly emits an audible clicking noise
Relevant TI forum post with no resolution: here.
I am using an AOZ2264NQI-11 chip to convert 24 V down to 12 V. I originally designed this circuit for use with an AOZ2261NQI-12 chip, which has an ...
- 1,427
3
votes
3
answers
293
views
Using only ceramic capacitors on an input of an SMPS - unclear advice from manufacturer
I was reading through the datasheet of a boost converter, TPS61023 from TI.
In the "Input Capacitor Selection section", they give the following advice:
Notably, TI advises against using ...
- 572
1
vote
1
answer
1k
views
DC-DC buck regulator MP2359 sometimes damaged when input voltage is high
I use MP2359 (datasheet pdf) to convert high voltage into 3.3V. The input range of voltage is from 4.5V to 24V.
At low input voltages, things seem to be OK. However when I input a voltage of 21V (...
- 475
2
votes
1
answer
500
views
How to prevent buck regulator chip from blowing up when using near maximum input voltage?
I need to step down 24V to 5V in one of my projects, so I used TPS54302DDCR (has a maximum input voltage of 28V) by TI and designed the circuit according to its datasheet and example schematic. ...
- 101
0
votes
1
answer
249
views
Why is my TPS62162DSGT regulator burning?
I need a 12V and 3.3V power supply for a circuit, so I designed a regulator onto a board to turn the 12V to 3.3V. I used the TI TPS62162DSGT to do this, and my schematic looks like:
I used the ...
- 110
2
votes
0
answers
98
views
Why did the lmr51430XFDDCR get fried?
I used the LMR51430XFDDCR as a DC/DC power converter on my PCB. Upon connecting a fully charged 3-cell LiPo battery (12.5V), the converter instantly failed. The PCB is designed to draw no more than 2....
- 197