All Questions
99
questions
2
votes
1
answer
132
views
Output Capacitor Design for a Multiphase Buck Converter
According to this application note from Texas Instruments, in the design of the output filter for a multiphase buck converter there are basically two ways of choosing the output capacitor. The first ...
0
votes
1
answer
79
views
Power stage of a buck converter as VCCS
In a buck converter using current-mode control as control loop, why can the power stage be seen as a voltage-controlled current source? Is it possible to understand that from a simple equation?
- 324
0
votes
0
answers
58
views
Using 2 LiPo Batteries via 2 Buck Converters for External Notebook Power Supply - will it work?
I have an old ThinkPad X220T notebook of which the internal battery is broken (and removed).
To get my notebook working on the go again I want to build an external portable power supply with 2 LiPo ...
5
votes
1
answer
247
views
Art of Electronics - buck converter ripple current derivation
I'm struggling to understand how this buck converter equation in The Art of Electronics can be true.
Page 642 shows this Buck Converter:
and then these graphs of current and voltage are also provided
...
- 165
1
vote
0
answers
55
views
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
1
vote
1
answer
259
views
Selecting PFC topology
I'm considering different PFC topologies for the AC-DC stage of a device around 1 kW with aim of optimizing for efficiency and secondarily component size. This far I have identified following options:
...
1
vote
1
answer
185
views
Identity a QFN chip
I would appreciate your help in identifying an electronic chip in a QFN package with 24 pins that belongs to a Roland R-05 sound recorder.
The component is located near the DC/battery input and I ...
- 59
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
0
votes
2
answers
198
views
Design that outperforms buck converter
Above is quoted from here. I was just shocked to find out that the first image provides a much more efficient and simpler way to step down a voltage instead of using a buck converter circuit (second ...
1
vote
1
answer
152
views
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 ...
- 339
1
vote
1
answer
84
views
PSRR of an amp + ADC input stage
I have an input stage that consists of an amplifier then an ADC. The op-amp and ADC are powered by Buck voltage regulators.
I want to measure the PSRR of this stage, so I am planning on breaking the ...
- 379
1
vote
3
answers
293
views
Buck converter simulation Vout lower than expected
I am trying to design a simple buck converter in LTSpice. Here are my parameters:
...
- 21
1
vote
1
answer
137
views
Reduce the heat output of a MOSFET (buck LM5085)
First of all I have to say that I am a beginner, and I don't have an oscilloscope to work with. Just a multimeter.
I'm trying to design a PoE+ board with a 9.5 V @ 3 A output.
The PoE+ part works fine ...
- 139
2
votes
1
answer
280
views
5V and 12V derived from a regulated 12V supply? Buck converter for 5V, in parallel with 12V load?
Apologies up front — this is super basic, but I’m sleep deprived and on a deadline for a personal project.
This is all DC. I have a 12 V input (via a wall-wart). I need 5 V to power some electronics (...
- 132
2
votes
1
answer
238
views
Critical inductance for buck converter
I have this problem: -
The critical current must be \$P_{out} = V_{out}I_{crit} \Rightarrow I_{crit}=\dfrac{45\text{W}}{16\text{V}} = 2.8125 \text{A} \$
Using eq. 3.43 from Ned Mohan's book we have
$$...
- 4,145