Questions tagged [buck]
A non-isolated DC-DC converter topology which outputs a voltage less than or equal to the input voltage.
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Choosing an appropriate gate driver for IRLZ44N high side for a buck converter
For the TL;DR folks:
Need high side NMOS gate driver IC, similar to Julian Ilett's DCOI driver but cheaper, higher switching speed and less complex;
THT highly preferred, because 1,27mm perfboard is ...
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Switching Voltage Regulator not Outputting Correct Voltage
I am working with a LM2576T-ADJ that is taking as an input voltage a 2 cell Li-Po battery that in my application won't decrease below 8V and should output a voltage of approximately 6V to power a pair ...
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Buck converter programable CC with DAC
I am trying to implement a programable CC (Constant current) functionality into the utilized buck converter (AP64501SP-13). The converter is to be used for series cells charging. I need to be able to ...
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Battery charger circuit confusion - drive and compensation
I'm building something that is going to have Li-Ion batteries so I'm trying to learn how a battery charger actually works. I've been looking over the datasheets for the BQ2000 and the BQ2954. I will ...
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Low-side push-pull transistor of MOSFET gate driver damaged
I have a buck converter as shown in the given figure (48 V output):
At rated loads the buck converter operates correctly as expected. When I test the circuit with the over-current and the short-...
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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
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Control scheme to regulate Vin using a Buck regulator
I am trying to create a control scheme that allows a buck regulator to regulate its input voltage instead of its output voltage. I'm trying to make an efficient shunting regulator. My current approach ...
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Non-triangular/Incorrect (non linear) inductor current waveform for half bridge buck converter
I have a buck converter (Half bridge) as shown in the schematic below. (48V output). V_D goes to an external inductor.
I have measured the inductor current for different loads (Nominal(upto 4A), ...
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Gate source voltage of half bridge with bootstrap capacitor incorrect when measured
I have a gate driver circuit (Bootstrap capacitor for high side) as in the given diagram.
I measured the Vgs for high and low side as shown in the figure below. I get the wrong voltage level for the ...
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Current-mode buck: get current from inductor winding
I was recently reading about current-mode control in switching converters.
When discussing the current sense signal, all sources I have read either show the current sense as some kind of additional ...
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LTspice transformer and buck converter
I am trying to simulate an efficient circuit to take 120 V AC at 60 Hz and convert it to 5 V, 5 A. I have a transformer and rectifier circuit to get the 120 V down to about 12.6 V DC and I made a buck ...
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DC-DC converter circuit LM5164
I would like to build a DC-DC converter circuit using EasyEDA that can output about 80V from 7 Nissan Leaf battery modules that are about 55V nominal.
I am looking at the datasheet for the LM5164 and ...
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How does the COMP/EN pin of the MAX1967/MAX1966 work?
I know this question may seem simple to more experienced people but I struggle to understand how the COMP/EN pin works on this particular IC.
I want to use it for a buck converter that has external ...
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DC-DC converter/step down layout improvements/feedback
I'm designing a board with a 12V to 5V DC-DC converter circuit and I would like some feedback on how it can be improved. As it is the first time I have designed such a circuit, I'm not the most ...
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Buck regulator thermals calculations
Schematic:
Specification:
Vin = 24V
Vout =5V
Iout max = 8A
Freq = 0.691 Mhz
Assumptions: Good layout and FETs mounted on 1-2 inch^2 of copper.
Calculations based on this doc: https://www.ti.com/lit/...
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