All Questions
Tagged with buck power-electronics
129
questions
2
votes
1
answer
127
views
AC input buck converter output ground oscillating
Attached the buck converter complete circuit. It is working fine and the output voltage is staying constant.
But, just before the mosfet is turned on, the out_gnd ...
- 105
0
votes
0
answers
63
views
Would a square waveform (or trapezoidal waveform) have frequency content lower than its fundamental frequency?
I was trying to understand the LC circuit response for the circuit given below.
(Note: fsw indicates the frequency of input square wave as in a buck converter)
As far as I know, for a linear circuit, ...
- 3,032
2
votes
1
answer
581
views
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, ...
- 868
1
vote
1
answer
57
views
Power supply connected to multiple buck converters, input current requirements
I have a 24V/40A power supply with a foldback current limiter. And I need to connect 76 buck converters of 5V and 2A each to it. Since the current of the power supply is limited and considering that ...
- 11
1
vote
1
answer
89
views
Charging a power bank with a solar panel
Is there either a simple circuit that I could build, or a good circuit/pre-made board that will charge up a 6700mAh/5V/2A power bank with a small solar panel that is attached to the cover of an ...
- 23
4
votes
2
answers
664
views
Why is my DC-DC buck converter consuming 8mA of current with no load connected?
I am using a TPS5430 buck converter on my PCB which is converting 12V to 8V. If I shutdown the buck converter using the enable pin it consumes only a few micro amps but if I leave it enabled with no ...
2
votes
5
answers
276
views
I calculated the power loss of a switching regulator and it doesn't match the datasheet. Am I missing something?
I'm trying to figure out how On Semi's LM2575D2T-5G is only 77% efficient. It's the fixed 5 V output version of the component.
The datasheet gives Vin = 12 V and Iload = 1 A. Based on this, power in = ...
- 21
4
votes
2
answers
897
views
What is this ringing in the inductor current?
I am working on a buck-boost converter and I see this ringing in the inductor current. It happens on turn on of the high side FET (See attached Image). First of all is this ringing normal?
Is there ...
1
vote
2
answers
1k
views
Reverse recovery time of diodes and its effect in buck converters
I'm currently working on a buck converter topology with a low side switched inductor. The goal is to achieve a constant current in the inductor, therefor only the mean voltage is important and output ...
- 23
0
votes
2
answers
1k
views
Would increasing the load resistance in a buck converter increase efficiency?
I was recently asked in an interview if the efficiency of a buck converter would change based on changing the load resistance (I assumed this meant constant input and output voltage).
I answered that ...
- 1
1
vote
0
answers
42
views
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/...
- 757
0
votes
1
answer
86
views
Buck converter: Additional circuitry working not clear
Saw the below schematic of a buck converter, but not able to figure out the working of the marked section. It is shown Node 1 is at 16 V.
Looks like sensing the differential voltage across inductor, ...
- 3,032
2
votes
0
answers
95
views
Is it true that power supply design is difficult when input voltage range is wider?
During power supply (buck converter) testing, I had seen the lowest efficiency values corresponding to highest input voltage. I thought if the design meets this worst case scenario, it should be ok no ...
- 3,032
2
votes
2
answers
206
views
MOSFET selection for buck regulator (SOA vs thermal dissipation)
I am trying to design a buck regulator with the following specification: Vin = 24V Vout = 5V I max = 8A Fsw=228k. The load is basically a long strip of RGB LED's. Which in certain cases would be all ...
- 757
0
votes
0
answers
48
views
Integrated buck regulator capable of 12A
I was narrowing down design options on digikey for a buck regulator capable of 5v and 8A continuous currents when i came across the following part which integrates the FETs and is capable of wide ...
- 757