All Questions
Tagged with buck power-electronics
129
questions
1
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0
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390
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Reverse recovery body diode in synchronous buck converter
I am building a synchronous buck converter from 72 V to 4.2 V 2 A. Is there a way to lower the losses of the lowside MOSFET’s body diode? I am using a switching frequency of 300 kHz and with the ...
- 103
0
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1
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56
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Possible fixes to a power supply thermals issue
The question applies to a buck converter design on my board:
Here is a 3D view of this section:
Layout of this section:
L1:
L2:
Layer 3 is power and layer 4 is again a full ground plane.
Here is ...
- 757
1
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1
answer
268
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What is the min and max input voltage range of a buck converter to maintain efficiency above 90% [closed]
I want to design a stepdown converter from 72V lithium ion battery to 12V, 5A. I am torn between using a flyback converter and a buck converter. Which topology will give me maximum efficiency at that ...
- 103
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1
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173
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How can I achieve a 25V - 5V @10A buck circuit, and a 25V - 8V @6.5A buck circuit? [closed]
I'm a computer engineer major in my senior year.
My team and I are making a SmartKart, and I'm responsible for power management and power designing.
Right now, based on several components we will be ...
- 1
0
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3
answers
378
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Multi-phase buck converter inductor selection
This question is regarding the inductor design (uncoupled) in a multiphase buck converter.
In a multiphase converter, the inductance per phase requirement is higher than the corresponding single phase ...
- 3,032
0
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2
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186
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Clarifications needed about buck converter output ripple voltage derivation
I have a question regarding buck converter output ripple. In the below figure, could you please tell me how the area shown in the red circle has a time duration of Ts/2?
- 2,593
5
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4
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Why do buck converters end up in steady state?
I'm studying buck converters such as the one in the following simulation:
I have learned that for buck converters that are in continuous conduction mode and at steady state, the following equation ...
- 543
3
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4
answers
484
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What component provides the bulk of the current in a buck converter? the capacitor or the inductor?
I’m studying buck converters and I have found contradicting sources claiming either of these statements:
The inductor stores and releases the bulk of the current, the capacitor is there just for ...
- 543
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1
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1k
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Understanding Power Good Signal in TPS54719
I'm using TI TPS54719 DC-DC and I'm trying to understand the PWRGD signal functionality.
Definition of PWRGD pin in datasheet: An open drain output, asserts low if output voltage is low due to thermal ...
- 1,067
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1k
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Design of a Buck Converter with LC Input Filter
I am attempting to design a circuit from an exercise:
I am stuck at point (c). I attempted to calculate the voltage and current ripple in the LC filter using the small-ripple approximation, but this ...
- 119
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1
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111
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Isolated board design suggestions
First of all thanks for reading this post. I am designing an isolated board for several peripherals for which I need your help/suggestions. The board contains a buck converter (like LM2596) to step ...
0
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0
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110
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Buck converter high side switch GND
In Figure 1, I designed a synchronous buck converter using the IR2110S half bridge gate driver integration. However, when I look at the source-GND measurements of the high side MOSFETs in Figure 2, I ...
- 1
0
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2
answers
607
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Does the body diode of the high side n-channel FET in a buck converter turn on during switch node voltage spike time?
A typical synchronous buck:
The normal switch node spike that people typically see when the high side FET turns on:
In the past i have been fairly negligible on this part. When the switch node spike ...
- 109
2
votes
1
answer
752
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Practical vs. theoretical buck converter
I am currently looking at open loop buck converters. I am running it with the following:
Switching frequency (f) = 62500
Inductance (L) = 100e-6
Input voltage (Vi) = 5
Output current (Io) = 0.06
...
- 451
1
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1
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148
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Buck converter controller design
This is the Buck converter with feedback loop.
source: Fundamentals of Power electronics by Erickson and Maksimovic
In this circuit, Vm is set to be 4V. However, in general, in a converter design, ...
- 377