All Questions
30
questions
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
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
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
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
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
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