All Questions
103
questions
1
vote
1
answer
120
views
24 V input, three 5 V outputs DC-DC buck converter design
I would like to make a DC-DC buck converter which has 24 V input and three 5 V outputs, but a typical buck converter circuits have only one output. How to change it to three outputs without an extra ...
- 13
0
votes
2
answers
136
views
Buck converter and resistive wire
I'd like to ask about my circuit.
It is a variable buck converter operated by an Arduino. At the end the 22 Ω resistor is resistive wire supposed to get hot because of the current.
One thing that ...
- 13
0
votes
2
answers
801
views
What is the mode of MOSFET or BJT in buck converter?
I want to implement buck converter with conventional design (not synchronous etc) like below.
And I want to implement the converter for two cases. One is to use BJT as switching device and another is ...
- 11
2
votes
1
answer
238
views
Critical inductance for buck converter
I have this problem: -
The critical current must be \$P_{out} = V_{out}I_{crit} \Rightarrow I_{crit}=\dfrac{45\text{W}}{16\text{V}} = 2.8125 \text{A} \$
Using eq. 3.43 from Ned Mohan's book we have
$$...
- 4,145
0
votes
0
answers
247
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How to design a filter for multiple buck converters
I am designing an electronic circuit with multiple buck converters on it. All bucks are supplied by a 12V DC input voltage from a converter which is on an other card. I want that my converters don't ...
- 1
0
votes
2
answers
1k
views
High Voltage PWM
I really hope someone can help me with this difficult issue:
I want to generate a PWM signal from a 170V DC input.
ok, so far I have an arduino that can generate a PWM signal and drive a MOSFET that ...
- 11
1
vote
2
answers
138
views
Buck converter output voltage dips and makes noise when connecting 1A load
I've designed a buck-converter board using a ROHM BD9F500QUZ-E2 for 12 V output. Input will be connected to a 4S battery.
On no-load conditions, the IC outputs 12 V, and when the IC is loaded with 500 ...
- 49
0
votes
0
answers
28
views
power available to a DC-DC step down atached to an ac power adapter
I have an AC-DC power adapter with output rated at 3.42A @ 19V and a Step Down Buck converter Xl4015 rated to manage up to 5A with 96% efficiency conected to the power adapter output.
What is the ...
-2
votes
1
answer
692
views
Why do I get these voltage spikes in my buck converter? [closed]
I want to make a buck converter with bidirectional GaN FETs, so each switch is made up of two back-to-back GaNs:
The problem that I encountered is that if I have a deadtime (DT) higher than 0 ns ...
- 11
0
votes
1
answer
365
views
Step-down converter in an ATX PSU, why?
I was recently looking at a 500W PSU schematic, and found out they used step-down converters on 12v and 5v output. Schematic is attached(pls see hi-res at https://ibb.co/nbDRJPq)
The D2 diode charges ...
- 392
1
vote
0
answers
243
views
Synchronous DC-DC buck converter body diode switching loss
I have a couple of questions regarding the body diode of MOSFET.
I was looking at the calculation of the switching losses in the synchronous buck converter.
For calculating the turn-off switching ...
- 43
-1
votes
1
answer
104
views
Understanding Buck Converters [closed]
I need a little help designing a buck converter. Basically I want to generate a 5V output that will stay the same regardless of load resistance and that will exist when the input varies between 12 and ...
- 1
0
votes
0
answers
111
views
Buck converter design review - updated
Last week I asked this question attempting to find a solution to efficiently converting higher voltage to lower voltage.
From the answers, I arrived at TI Power Designer and I ended up with this ...
- 360
0
votes
2
answers
2k
views
How does a boost converter allow for a gain in output voltage by just switching the positions of the inductor and switch?
I get that in a buck converter, a low pass LC circuit was attached and this effectively filters out high frequencies. If the bandwidth is configured so that it is lower than the switching frequency, a ...
- 469
1
vote
4
answers
154
views
Can a Buck converter operated at 200kHz be used to step down 230V DC input to 5V DC output?
I was wondering whether this type of converter is possible. Any clarification on it will be appreciated. Thanks.
