All Questions
Tagged with buck voltage-regulator
141
questions
1
vote
2
answers
115
views
Can anyone see why I'm killing my buck regulator?
I've tried hard, but I can't figure it out. The buck regulator runs for about about 1 s and then it dies with the buck regulator shorted to ground.
The LDO is working fine. If I power the LDO with 5.5 ...
- 145
0
votes
1
answer
76
views
Powering MCU from VBUS without damaging 5 V regulator
My board is powered normally from a 12 V input through a buck converter (5 V) K7805-500 into an AMS1117 (3.3 V)
When programming I will need to power the board from VBUS (5 V). How can I tap into the ...
- 197
1
vote
1
answer
168
views
How to minimize the ripple on a buck regulator powering a CM4?
While designing a Raspberry Pi CM4 application board, I found an issue with the power supply.
I selected the same IC as the official CM4 I/O board: the AP64501SP-13. I used even the same values for a ...
- 11
0
votes
1
answer
212
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54 V to 5 V using LM2576HV
I have a requirement to convert 54 V battery output to 5 V. My battery's positive terminal is grounded. I tried the connection as mentioned in the datasheet which is attached here, but as soon as I ...
- 133
0
votes
0
answers
57
views
High ripple in the output
We have chosen the MCP16311 buck converter for 4 V @ 1 A output.
design specifications as below.
Input voltage range: 5 to 20 V (source - USB type C mobile, charging adapter)
Output Voltage : 4 V
...
user220456
0
votes
0
answers
318
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Is Zener Diode a good choice for DC voltage regulation for a buck converter? And how should I use it?
I have a buck converter that I want to use to step down the DC voltage from a UPS to 13V to power a CCTV set-up. The buck converter input is specified as 40V but the UPS output fluctuates to a max of ...
- 1
3
votes
1
answer
453
views
Confusion about feedback resistor values for buck converter
I'm making my first voltage regulation first with a buck converter, but I'm having some trouble making sense of the following datasheet. https://www.ti.com/lit/ds/symlink/tps560200.pdf
So I've made ...
- 133
3
votes
1
answer
82
views
LM22673 diode selection
I'm fairly new to electronics, and in my project I'm using LM22673 as Buck Converter in this Diode selection parts this is given which is confusing for me.
as
Ultra-fast diodes can switch very fast, ...
- 176
0
votes
1
answer
1k
views
24V to 5V step down voltage regulator with LM2678 [closed]
Reference: https://www.ti.com/lit/ds/symlink/lm2678.pdf
I have constructed the circuit above attempting to step down the DC voltage from 24V to 5V. But I keep getting 8.3V as the output voltage. It is ...
- 11
0
votes
2
answers
116
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Output voltage of a step-down voltage regulator (or buck converter)
I've the following step-down regulator:
and I'm wondering how to get the following formula for the output voltage:
$$
V_{OUT} = \frac{T_{ON}}{T_{ON} + T_{OFF}} \, V_{IN}
$$
I calculated the current ...
- 482
1
vote
1
answer
266
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Determine the min/max resistance of an SMD variable resistor
I want to determine my minimum and maximum resistance rating for my variable resistor but failed to find the relevant information in the datasheet (this might be an issue more 'noobs' might have, ...
- 309
-2
votes
2
answers
1k
views
Average voltage in PWM?
I have a doubt regarding average PWM voltage. Let's take a buck convertor with Vin=10V, Vout=5V. With this we can determine the duty cycle of PWM needs to be 50%. Thus means the MOSFET of the buck is ...
- 543
1
vote
1
answer
127
views
Buck converter coil selection (Coilcraft vs Bourns)
I am using the SCT2331 (a clone of the Diodes AP63200, with 400KHz switching frequency instead of 500KHz). The design works with an inductor from Coilcraft (LPS3314-103), but when I try a different, ...
- 7,600
0
votes
1
answer
92
views
Voltage regulator equation
I'm designing a circuit using this buck regulator (AOZ2253TQI-20) from Alpha & Omega. Data sheet here, http://www.aosmd.com/res/data_sheets/AOZ2253TQI-20.pdf
The data sheet doesn't specifically ...
- 31
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