All Questions
63
questions
0
votes
3
answers
83
views
How can a current probe avoid saturation?
It is a buck converter, And I want to know how current probe can avoid saturation.
Turns ratio is 1:1000. And DC makes transformer saturation.
So... How can probe avoid saturation?
- 15
3
votes
3
answers
806
views
Input impedance of a buck converter
Is there an approximate formula for calculating the minimum value of the input resistance (or impedance) of a switching regulator? I found several formulas but can't figure out which one to choose. I ...
- 61
0
votes
1
answer
83
views
Reverse current into DC/DC or LDO
Suppose we have a generic scheme like this in figure, in order to protect the inputs of a microcontroller or logic gates from overvoltage essentially. For instance now we're applying 10 V at the input,...
- 61
0
votes
1
answer
94
views
How to divide 12V/15A buck converter output into two outputs with the same specs? [closed]
I am currently working on a project to build a mini-atx pc for a rover. Heres a simple schematic of it :
The picoPSU Atx connector takes in 12V DC with a max of 15A peak and the zotac gpu 12V DC with ...
1
vote
1
answer
73
views
Power dissipation formula
Is the below formula, present on page 26 of this buck converter correct to use?
Or should I use the formula mentioned in the 3 paragraph of this accepted answer?
- 1
0
votes
2
answers
155
views
How much current should a switching regulator consume on its own?
With your help on stack exchange, I finally finished assembling my first LM5143QRHARQ1-based buck converter! And it works! It does output 7V (well 7.03V) The only problem is that it consumes around 0....
- 411
0
votes
2
answers
86
views
OVP threshold for this converter
Here, this Boost converter, says that it can boost the input voltage from 2.5 V to 10 V.
My input is from a 7.4 V, 7.5 Ah battery. Output is 9 V. The maximum load current is 3 A.
Ideally, for my OVP ...
user220456
1
vote
1
answer
238
views
What happens if the Input voltage and the output voltage are same in a boost converter?
I'd just like to know what would happen if the Input voltage and the output voltage are same in a boost converter. I have a feel that it might not work.
But would like to understand the effects that ...
user220456
0
votes
1
answer
63
views
How current gets separated in multiple SW pins in buck converter?
In some high current buck converters, there are multiple SW pins for output current. How the current gets divided between them?
Example, lets consider a buck convertor has 5 SW pins and sourcing 30 A ...
- 543
2
votes
2
answers
2k
views
Buck converter with UC3843
I am building a simple buck converter circuit with a current-mode control IC, the UC3843.
In the application note of the UC3843, a sample circuit is given:
I am completely clueless about how these ...
- 29
0
votes
3
answers
64
views
Current and voltage value before inductor pin in buck converter
In buck converter we know that pure DC current will be after inductor pin. But what will be the current/voltage value before it.
Let’s take an example, the buck converter circuit with 12 V input to 3....
- 543
1
vote
0
answers
55
views
Boost converter output voltage drops
I'm using an MIC2251 (MIC2251-1YD5-TR) in a design to boost a lithium battery (3.6V-4.1V) to 5.4V for powering a small camera peripheral that requires a typical draw of 80mA. I expect that the worse ...
user220456
1
vote
2
answers
116
views
How to calculate the maximum output current of an LTC3440?
I'm trying to make sense of the datasheet of the LTC3440. I can't find how to calculate the maximum output current and on what it depends.
There is an IOUT(MAX)BURST formula for the burst mode on page ...
- 169
0
votes
0
answers
30
views
How to change from HyperLight Load mode to forced PWM mode
In the MIC33M650 step-down module, is there a possibility/workaround to deactivate the HyperLight Load mode? Or decrease the threshold of the current needed to activate forced-PWM mode?
user220456
1
vote
2
answers
68
views
Output load current less - DCDC Converter [closed]
I'm using this Boost converter. 3.6V to 12V with a load current 300mA. 10uH is the inductor used.
But I am only able to get a maximum load current of 120mA. What might be the reason?
user220456
4
votes
1
answer
216
views
Switching frequency data not available
Why do some dc-dc buck or boost converters do not have the switching frequency value in their datasheet?
For example: Link does not have switching frequency ?
Is it possible to get power dissipation ...
user220456
16
votes
4
answers
5k
views
What is the difference between a linear regulator and an LDO
Can someone tell me what the difference between linear regulators and LDOs is?
From what I have read and understood, it is that linear regulators and LDOs don't use switching elements, but I think ...
user220456
0
votes
2
answers
236
views
What is the formula or any method to calculate the value of the output capacitor and inductor in a buck converter
I have using a buck converter whose output is 5V and 1A.
Can someone tell me whether these is any formula to calculate the value of the output capacitor? Like, without involving the switching ...
user220456
1
vote
0
answers
126
views
Inductor saturation current
I'm trying to determine an inductor's saturation current, I use a PWM with a gate driver (TLP250) and a 0.4Ω sense resistor at the source which I probe across to capture the current waveform.
I ...
- 41
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 ...
0
votes
4
answers
384
views
How much current is available with a buck converter? (re: 20V/5A to 5V/20A?)
I've been trying to research this as much as possible but I'm still a little confused.
If I'm using a PSU rated for 20V / 5A, can a typical buck converter output 5V / 20A? (assuming 100% efficiency ...
- 481
0
votes
1
answer
80
views
Why is my switching frequency so abnormal?
I am using this Buck Converter 2A part.
I am giving an input voltage of 3.3V to get an output of 1.2V for a switching frequency of 2.25MHz.
I am giving different load currents of 0A, 0.2A, 0.5A & ...
user220456
3
votes
4
answers
3k
views
Output capacitors of DC-DC converters
I am trying to understand what type of output capacitor is a better option.
Suppose I require a 10uF output capacitor at the output of the buck converter, which one should I pick - aluminum ...
user220456
0
votes
1
answer
588
views
How to find the minimum and maximum voltage of this buck converter
I am using buck converter. 3.3V output & 2.5A part with 2.1MHz switching frequency.
I am powering my microcontroller with this 3.3V output. So, I'd like to find the output voltage tolerance of the ...
user220456
0
votes
1
answer
1k
views
LC filter of buck converter
Can someone explain me intuitively on why the LC filter cut off frequency should be very less than the switching frequency of the buck converter?
What is the reason and why can't it be higher than the ...
user220456
0
votes
1
answer
517
views
Buck converter output LC filter phase difference
I was going through a few buck converter questions in this forum to understand deeply about the circuit and I found this question. However, I am not focused too much on the ripple right now. But when ...
user220456
1
vote
2
answers
1k
views
What causes harmonics in DC-DC Switching converters like Buck and Boost Converter
Can someone tell me what and how the harmonics are caused in the DC-DC Switching converters?
I tried to read this, but I am not understanding. Can someone please explain in simple terms
user220456
1
vote
1
answer
352
views
Buck Converter Switching Loop Area in Layout Should be small
I have seen recommendations in the datasheets of buck converters, that the switching loop area should be as small as possible. Can someone help me on what would happen if the switching area is large ...
user220456
0
votes
1
answer
660
views
Buck Converter Voltage waveform at the free wheeling diode cathode and anode
I am trying to understand the voltages at the free wheeling diode's cathode and anode in a buck converter.
During the ON-state (as in the above circuit diagram), I assume the voltage at the diode's ...
user220456
0
votes
1
answer
80
views
Design of DC-DC Converters
While designing buck converters (or boost converters), why do we usually fix some percentage of the Ripple current (or ripple voltage) and from this percentage, we arrive at the value of inductor and ...
user220456