All Questions
59
questions
5
votes
2
answers
7k
views
Input voltage for feedback pin on LM2596 Voltage regulator
I am using LM2596 for a dc supply where I could alter the output voltage. Datasheet here.
I have setup according to page 9 "Adjustable Output Voltage Versions". Everything worked fine. The output ...
- 255
3
votes
2
answers
199
views
One step-down regulator 24 V to 1V or two step-down regulators with lower steps?
I am trying to design a working principle scheme to step-down the input voltage from 24Vdc ---> different low voltages (1.8 V, 1 V, 1.5 V, 3.3 V with ripples ~ 1%).
Could you kindly explain me the ...
- 59
3
votes
1
answer
183
views
Why does my buck converter output 6.55 V instead of 5 V?
I'm trying to use the LMR51420 Simple Switcher IC to step down my 20 V DC to 5 V DC.
I have this circuit which is the typical application circuit from the datasheet:
When I measure the voltage on the ...
- 31
3
votes
3
answers
2k
views
Step-Down/Buck-Converter: How to replace feedback voltage reistor divider to electronically control the regulator output voltage
Most today used switching regulator ICs that I've seen have some kind of feedback voltage pins. I think I've pretty understood the way it works:
A resistor divider from output to ground is created to ...
- 288
3
votes
0
answers
180
views
LM3150 Webench not matching with LTSpice?
I'm trying to implement this design from Webench (5V @ 10A):
I'm using LTspice to simulate this design, but my results are bizarre, as shown here:
I have looked into this thread: TI Webench and ...
- 31
3
votes
2
answers
300
views
Low cost 30A 24Vto12V stepdown converter [duplicate]
I'm trying to design a 24V to 12V step down converter. Power efficiency is not that important to me, but I want to come up with the cheapest solution possible. I don't need isolation neither. So I ...
- 355
2
votes
2
answers
2k
views
Is it possible to convert 19.5V 3.33A to 12V 5.5A?
I have a laptop charger which has 19.5 V 3.33 A output. I want to use it for raspberry, which needs 5V and 2.5A and for monitor which needs 12V 3A. Is that charger strong enough to run the whole ...
2
votes
3
answers
1k
views
Buck converter adjustable output-voltage using digital potentiometer [closed]
I am trying to design a buck converter using an LM2576HV (Vref: 1.23 V) and a digital potentiometer (input: 48 V, output: 0 to 48 V, Imax= 3 A).
The digital potentiometer with the highest supply ...
- 21
2
votes
2
answers
319
views
How can I replace a potentiometer with a fixed resistor on a buck converter?
I want to use a buck converter which steps down 12 V DC to 5 V constant DV output to power my custom PCB.
I came across a buck converter in market which can do it but there is potentiometer on it ...
- 99
2
votes
2
answers
209
views
Calculating of the maximum output current of a 12 V to 3.3 V step-down converter
I am planning to use the AP3211 step-down converter to go from 12 V to 3.3 V. The maximum current at 12 V that I can supply to the input of the step-down converter is 0.3 A. Assuming the efficiency of ...
- 345
2
votes
1
answer
1k
views
Will a buck converter allow current to pass through if Vin is less than the configured output voltage?
In general, will a buck converter allow current to pass through if Vin is less than the configured output voltage?
Specifically, I'm reading the TPS54308 datasheet and I'm not seeing an answer to my ...
- 245
2
votes
2
answers
593
views
Limiting input voltage for buck converter
I want to power some micro controllers and a couple of leds on my electric bike, counting up towards 5 Amps.
Power supply is a 36V battery, with a range of about 42V to 33V. This voltage is to be ...
- 43
2
votes
1
answer
704
views
Switching regulator vs converter
Is there any difference between switching regulators and converters? I have read about step-down voltage regulator and buck converters and they seem to be the same. So, can I use the term converter ...
- 37
2
votes
3
answers
2k
views
How does using a DC-DC step down converter save power?
I understand how DC-DC buck converters save power when compared with a linear regulator, but do they save power when compared to not using power conversion all together? In my specific case, I have a ...
- 639
2
votes
2
answers
2k
views
Cooling buck converter mosfets by placing on bottom layer of PCB - a problem?
I have a design and layout for a buck converter which currently sits on one layer of a 2 layer PCB. I would like to force-cool the heat generating components of the board by placing them directly onto ...
- 133