All Questions
Tagged with buck switch-mode-power-supply
311
questions
0
votes
1
answer
91
views
When finding ESR/ESL of a ceramic capacitor, what frequency should I assume during a load step?
I want to determine the output droop in a transient load step for a buck converter I am designing.
The output capacitor will supply current during this load step, and there will be a drop associated ...
- 346
0
votes
1
answer
130
views
Buck converter inductance vs Line and load regulation
I know how to design the inductor and capacitor for a buck converter.
My question is let the calculated value of the inductance be some "X".
May I know what will happen to line and load ...
- 2,593
5
votes
1
answer
244
views
Art of Electronics - buck converter ripple current derivation
I'm struggling to understand how this buck converter equation in The Art of Electronics can be true.
Page 642 shows this Buck Converter:
and then these graphs of current and voltage are also provided
...
- 165
2
votes
1
answer
1k
views
Input filter to reduce conducted emissions caused by DC/DC converter
This material from ROHM explains the input filter design for a DC/DC converter.
The filter circuit is given below.
I understood the design of Lf, Cf2, Cd and Rd.
If you see the 3rd page (design of ...
- 2,593
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
6
votes
2
answers
1k
views
How does a buck converter's output ripple waveform become sinusoidal?
Below image is from Fundamentals of Power Electronics.
The ripple component of the inductor current will be flowing through the capacitor as shown in the ic(t) graph. This one I understood.
May I ...
- 2,593
1
vote
2
answers
680
views
How can I power an ESP32 with a 54V battery using a buck converter?
I need to power an ESP32 board from a 54 V battery. For that purpose, I understand that I need to step it down to 5 V so I need to design a step-down buck converter.
I tried the following circuit ...
- 133
3
votes
1
answer
400
views
Simple SMPS power supply using buck converter
I'm a pretty new hobbist in this field. I wanted to try to create a simple and cheap power supply that transforms 220 V, 50 Hz AC into 15 V, 8 A DC, but I really can't understand how.
I've tried the ...
- 311
2
votes
1
answer
99
views
Bare copper on buck converter PCB?
I am working on the design of dual 5V/3.3V power supply based on TI's TMZ12003EXT buck converter module. It's an older TI part, apparently intended for "rugged/military applications," but ...
- 720
1
vote
0
answers
73
views
Current-mode buck: get current from inductor winding
I was recently reading about current-mode control in switching converters.
When discussing the current sense signal, all sources I have read either show the current sense as some kind of additional ...
- 22.5k
2
votes
1
answer
374
views
In MOSFET switching loss calculation, where does the 0.5 factor come from?
I am going through this material for calculating the switching loss of the mosfet.(https://www.monolithicpower.com/frequency-selection-in-switching-power-supply-designs-part-i)
The switching loss ...
- 2,593
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
6
votes
3
answers
647
views
Why would you sense peak inductor current at the high-side PMOS transistor rather than at the NMOS?
I found this image for peak current mode sensing here.
Is there any reason that you sense the peak inductor current from the MP instead of theMN transistor? I know that ideally both should work but I ...
- 240
1
vote
1
answer
57
views
Power supply connected to multiple buck converters, input current requirements
I have a 24V/40A power supply with a foldback current limiter. And I need to connect 76 buck converters of 5V and 2A each to it. Since the current of the power supply is limited and considering that ...
- 11
1
vote
1
answer
194
views
4-20mA loop energy harvester
I'm designing a board which is powered from 4-20 mA Hart loop. Only two wire.
Actually I had 19~20V due to the 250ohm resistor of the master side.
I would like to power two electronic stages 12V@4mA ...
- 45