All Questions
Tagged with buck-boost power-supply
40
questions
0
votes
1
answer
75
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Constant output voltage in buck-boost converters
I'm a self-taught student. I'm trying to understand the working principle of buck-boost converters in continous conduction mode.
When the switch is turned on, the equation describing the inductor is ...
- 311
1
vote
1
answer
49
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Closed Loop Buck-Boost converter, no load condition
My question is how can I close the loop with no load condition of my buck-boost converter, by using peak limiting current mode control? Is the bleeder resistor needed or is it possible just to close ...
1
vote
3
answers
68
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Can I supply two different voltages with the same boost converter?
I have a VFD matrix display that needs both 90V and 70V to power on. I already designed a boost converter that will give me the 90V.
I was wondering if I can just put a voltage divider at the output ...
- 69
1
vote
1
answer
188
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Not able to get enough current from buck boost (sepic) converter made using TL494
I am trying to build a buckboost converter for converting 5-40v input to 5-35V output at 3A max to use it for many purposes by usign TL494. I am using a SEPIC topology as i want a non inverting output....
- 15
2
votes
2
answers
322
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What would be the "best" way to design a buck/boost circuit to convert 9Vdc to 10V and 5V?
I have an old console that I'd like to convert to USB-C that requires both 10V 1A and 5V 2A. Ideally, I'd like to run it off a 9V 2.2A source, so that it can be powered with a commonly available 20W ...
- 23
2
votes
1
answer
1k
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Determining the switching frequency of a buck-boost converter
I wanted to try to design a buck-boost converter (instead of buying it) to drive an electromagnet. I have a 12 V source and I want to have an output of 24 V and at least 200 mA. As input I'm using a ...
- 311
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1
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217
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Separating 5v and 12v circuits using diodes, converters, and switches
I have drawn out a project with multiple power options.
I am wondering if any of these reverse current protection diodes can be left out.
If the double pole double throw switch can be replaced by a ...
- 71
2
votes
1
answer
241
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Use a MOSFET to switch a 25V power source between two loads with backflow protection
I would like to switch the output of a buck-boost converter (input) between a powerbank output (output1) and a charging circuit (output2). The buck-boost voltage output is between 5V and 28V. The ...
- 33
2
votes
1
answer
581
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Buck-Boost Converter Inductor Value
I am designing a typical buck-boost converter using the LTC3530EMS#PBF IC from Analog Devices.
My design specs are as follows:
Vin: 3.0V - 4.2V
Vout: 3.3V
Iout(max): 300mA
Fsw: 1MHz
In the datasheet, ...
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4
votes
1
answer
1k
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Why is buck-boost converter showing a different trend than buck and boost in efficiency peaking point?
In general I was under the impression, the efficiency is highest when input and output voltage are close to each other. This holds good for boost (text book image below) and buck (personal experience)....
- 3,032
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0
answers
546
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Powering brushless motor only works with separated power supplies
I have recently taken over for a guy who retired from my company and I am working on getting a prototype that he designed back in 2016 up and running.
We are using two 3.6 V 18650 batteries to power ...
-1
votes
2
answers
535
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Buck/boost converter (XL6019) produces wrong output voltage when powerbank goes less than 5v
I recently bought a buck/boost converter (XL6019), and I was trying to boost to 9 V to power a device (RC Car).
My idea was to use a power bank instead of 6 x 1.5 V AA batteries, but I realized that ...
- 11
0
votes
1
answer
476
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In DC-DC converters, how can the ripple current affect the circuit's performance?
I have a DC-DC buck boost converter (TPS55288) that I was planning on using for a project. I'm making a revision to my current heated gloves, and my circuit needs to be as small as possible since the ...
- 1,195
0
votes
3
answers
257
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Soft latch switch circuit with buck converter load does not work
I have been experimenting with soft latch switches. There is one that EEV Blog has developed that only uses 2 NPN transistors and a P-Channel MOSFET. The circuit is seen at 14:44 in this video.
I have ...
- 850
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votes
0
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65
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Power output from a buck boost circuit is too low
Thanks to all who helped on the earlier part of the circuit - that's now fixed and working.
Now the buck boost circuit to drive the LED is working, but it only puts out a very small fraction of the ...
- 11