All Questions
60
questions
6
votes
1
answer
5k
views
Audible noise in DC-DC buck converter
In my design, I have a +3.3 V SMPS that provides power to digital circuits (microcontroller, EEPROM, etc.). The microcontroller allows applying a 100 Hz PWM signal with variable duty cycle and with an ...
- 368
4
votes
1
answer
901
views
DC/DC Switching Converters: Is it possible to run a current-mode converter in voltage-mode only?
DC/DC Switching Converters: Is it possible to run a current-mode converter in voltage-mode only?
If so, is there an example using a buck converter?
In particular, I'd like to use UC3843 (LT1243) in ...
- 45
4
votes
1
answer
2k
views
SMPS Buck converter with PWM circuit
I am designing a buck converter with PWM circuitry for a school project to drive a MOSFET switch to keep my output voltage constant.
The specs are:
input voltage of 20v DC +/- 4
output voltage of 5v ...
- 169
3
votes
1
answer
5k
views
Voltage Mode Control of a DC-DC Buck converter
My previous question was about a hysteretic-style buck converter:
Buck Converter Control Scheme- Why isn't just a comparator not enough?
By what I gather from previous answers, a hysteretic-...
- 887
2
votes
4
answers
3k
views
Power MOSFET gets hot while driving Peltier by step-down buck voltage converter
I have a TEC1-12712 Peltier element, which I am driving using Arduino microcontroller through IRFZ44N and buck step down converter (to smooth PWM).
Overall, circuit consists of:
12V, 8.5A max DC ...
- 167
2
votes
1
answer
136
views
Why won't my voltage feedback system work?
Vin is a constant DC source. This circuit will take a random DC input between 12.6V and 48V, and then maintain a constant output voltage of 5V using a system of voltage feedback.
with the source code,...
- 288
2
votes
1
answer
151
views
Is it possible to include a behavioural source in an LTspice sub-circuit for use in a buck converter model?
I'm in the process of modelling a buck converter following the approach in Sam Ben-Yaakov's A unified SPICE compatible average model of PWM converters article in which he models a switched inductor ...
- 137
2
votes
2
answers
966
views
Step down converter with low side MOSFET
I'm trying to gain confidence with electronic as I'm quite new to this world. To get started I began to study a buck converter which I'm simulating with LTspice.
The problem is that the design that I ...
- 23
2
votes
1
answer
751
views
Voltage drop pulse transformer
I'm trying to design a buck converter controlled by a PWM signal. The PWM signal and the converter is isolated with a pulse transformer.
My issue is that the pulse transformer behaves differently ...
- 69
1
vote
2
answers
3k
views
DC-DC buck converter controlled by ATTINY - optimize PWM for maximum resolution
I got a solenoid with the following data:
1.25W
24V
460Ohm resistance
Inductance value unknown
I'm working on a sensor PCB which also needs to control the force of the solenoid. The sensor PCB is ...
- 1,822
1
vote
3
answers
496
views
Buck converter, duty cycle has inverse relationship with Vout?
I've been trying to design a DC-DC step down (buck) converter for a school project, and have been getting unexpected results. I'm using a PWM signal from an arduino to step down the voltage, and have ...
- 11
1
vote
1
answer
1k
views
PWM modulator in voltage mode buck converter
I am referring to datasheet of LM3743 block diagram in page 5.
The EA and PWM Comp is in leading edge modulator configuration. According to my understanding SR latch which comes after PWM Comp must ...
- 305
1
vote
1
answer
533
views
AC/DC SMPS- How to do PWM [closed]
I'm trying to design and build a simple ac/dc smps that outputs 5v dc and capable of 2 amps. I currently have some of it designed but the problem I'm running into now is how to get a pwm signal with ...
- 69
1
vote
2
answers
3k
views
What PWM frequency to use on SMPS
Just to give a little back ground on the project - I am currently building a buck converter linked up to 2 * 250W solar panels in parallel, then use an MPPT algorithum to track the max power. I will ...
- 395
1
vote
1
answer
142
views
Buck converter PWM generation issue
I am trying to design a buck converter without using a controller IC. Input 32-52V output 12V, 50W.
I don't know how to get the desired duty cycle from the stable 2.5V error feedback. While it is ...
- 27