All Questions
23
questions
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
1
vote
0
answers
44
views
Switching Voltage Regulator not Outputting Correct Voltage
I am working with a LM2576T-ADJ that is taking as an input voltage a 2 cell Li-Po battery that in my application won't decrease below 8V and should output a voltage of approximately 6V to power a pair ...
- 11
0
votes
1
answer
93
views
Buck converter (MAX5035D) regulation problem
I didn´t expect to be having issues with a buck converter, but here I am.
My design goal is a simple 15-60 V to 10 V buck converter. I settled with the following schmematic:
I designed a 2-layer ...
- 1
0
votes
0
answers
57
views
High ripple in the output
We have chosen the MCP16311 buck converter for 4 V @ 1 A output.
design specifications as below.
Input voltage range: 5 to 20 V (source - USB type C mobile, charging adapter)
Output Voltage : 4 V
...
user220456
0
votes
2
answers
174
views
I would like to drop a variable DC voltage from input 30Vdc to 200Vdc to output 5Vdc with a max 200mA
I am new to electronics and would like some help if possible.
The incoming voltage will be variable from 30Vdc to 200Vdc coming from a bank of solar panels. The output is 5vdc at a max of 200mA. I ...
- 11
0
votes
2
answers
104
views
How can the output current be programmed in the LTC3649 step-down regulator?
I use Analog Devices' LTC3649 regulator as a step-down regulator. It is said that there is a programmable output current in the datasheet, but I have no idea how to do this. Does anyone have an idea ...
- 11
-1
votes
2
answers
348
views
I need help for design high voltage buck converter
I have a 500 Vdc from rectified 3 phase power and then I will make output to 220 V phase to phase 60Hz power. But 500 Vdc doesn't stabilized and Its need to step down to 220 Vdc stabilized.
So, I use ...
- 115
2
votes
1
answer
559
views
How to calculate RMS value for current square wave?
How do I calculate the RMS value for the current waveform during a transient event like the picture below?
Assuming:
Ix = 6 A
Iy = 38 A
duty cycle = 38%
frequency = unknown
My goal is to know what the ...
1
vote
0
answers
77
views
Considering the inductor in a buck DC-DC converter, how to compute the current through it?
I've been stuck for a few days to the very first point of a lab in which we analyse the behaviour of buck and boost converters. The circuit is built by the university I study in, so there is no acutal ...
3
votes
2
answers
467
views
LM22678 Unstable output
I am building a voltage regulator with the LM22678-5.
I used TI WE-Bench designer to get the component values needed for the regulator:
The regulator outputs 5V when there is no load however it ...
- 63
2
votes
2
answers
1k
views
Multiple Step-Down Voltage Rails from a single DC Power Supply
I have one working PCB which has three different Voltage Rails: 3.3V, 4V and ...
- 962
1
vote
2
answers
575
views
Setting up a step-down buck converter
I'm new to using buck converters. In the past I've just used linear voltage regulators but due to heat issues in my current project I've decided to give a buck converter a try, but I'm getting really ...
- 169
0
votes
2
answers
2k
views
Reducing input voltage spikes on buck converter
I am using a buck converter to drop from 5V to 1.8V to be able to drive both of these voltage levels in a single design. The buck converter works correctly to generate a clean 1.8V supply, but the ...
- 319
2
votes
2
answers
2k
views
switching noise from ltc3780
I have currently built a buck-boost converter using LTC3780 on a breadboard following this deisgn.
The circuit is calculated and designed to accommodate the input voltage given in the schematic. I ...
- 21
1
vote
3
answers
1k
views
Going from 72V to 5V with multiple switching regulators
I have a 72V battery which I want to step down to a 5V controller with limited power loss. The problem is that looking on the TI website the biggest range I could find for power regulators is the ...
- 629