Questions tagged [mc34063]
The mc34063 tag has no summary.
39 questions
4
votes
2
answers
290
views
SEPIC Output spiking - What's causing the problem? - MC34063
I am working on a SEPIC converter based on a NJM2374 IC (equivalent to MC34063) to be used in a DIY laboratory power supply. Unfortunately, I’ve encountered a lot of issues with spiking on the output.
...
- 165
0
votes
1
answer
687
views
Audible Noise in MC34063-Based Buck/Boost Converter Circuit
I am trying to make a hotplate with an ESP32 and I use MC34063 for buck/boost converters. The hotplate itself require 12-30V to operate and the ESP32 and LEDs need 3.3V.
Here is the circuit:
When the ...
- 357
1
vote
1
answer
267
views
Annoying noise when there is no load on MC34063 in boost configuration
I'm using MC34063 in step-up configuration to charge 4S lithium-ion battery pack. Input is 12 V output is set to 16.9 V. Module consists of a 0.33 Ω current sensing resistor, a shielded 2 A 100 uH ...
- 513
1
vote
1
answer
118
views
MC34063 output voltage rises with current draw
In my current project I implemented two MC34063 switching converters to provide a 3.3V and a 4V rail. Testing the converter circuitry I found some odd behaviour.
Unloaded I get a solid 4.0V, but when ...
0
votes
0
answers
90
views
How can I increase the output parameter of a boost converter based on tthe MC34063?
I would like to get 16.5V and 160mA output using an MC34063 IC. The circuit is designed on Multisim shown as a picture below. It provides the desired output.
In practice, this circuit has set as ...
- 39
3
votes
3
answers
639
views
MC34063 step-up unstable operation
I am building a 3.3V -> 15V/100mA boost converter using MC34063. I have used formulas in the datasheet to calculate values of components. Then I spotted some oscillations in Vout and instability of ...
- 115
0
votes
0
answers
146
views
Voltage inverter with MC34063A, input voltage drops on connection
I designed a circuit with an MC34063A to get -12V output from +5V.
The problem is that when I connect +5V to pin 6 (VCC) of MC34063A , +5V drops to 2V. Why is this happening?
- 1
2
votes
1
answer
340
views
MC34063 boost circuit drops voltage when adding load resistor in LTspice
I am using LTspice to simulate a MC34063 boost circuit to bring a 3.7 V Lipo battery up to 5 V in order to power a Raspberry Pi Zero.
When I simulate the circuit it works just fine (shown in the first ...
- 21
0
votes
1
answer
436
views
Step up converter with MC34063
I have a 24v humidifier that I would like to power using a 12v power supply, so in order to do that, I designed a voltage step up regulator based on the MC34063. But since the humidifier requires a ...
1
vote
2
answers
480
views
555 timer charge pump with feedback
In the circuit I am working on there is a requirement to create 30V DC source for a very light load (couple of mA max). I am aware that there a specialized ICs that can do that but I would like to ...
- 327
0
votes
2
answers
645
views
MC34063 24VDC to 5VDC [closed]
I am trying to set up a 24VDC => 5VDC converter using the MC34063.
The schematic is as follows:
I used the following component values:
C1 = 100µF
C2 = C3 =150µF
C4 = 100nF
C5 = 0.47nF
L1 = 150µH
...
- 53
0
votes
2
answers
629
views
MC34063 Output Voltage Sagging
I am working on a project where I have used MC-34063 boost supply on 3 pcb's and all the 3 places I have the same issue ie
output voltage is steady on open circuit, but soon as ANY load is connected, ...
- 155
0
votes
1
answer
264
views
MC34063A power consumption calculation
I'm designing a circuit based on the MC34063A switching regulator to step up 3.7V to 8V.
The 3.7V for Vin comes from a 3.7V Li Ion battery and so I'm trying to calculate the battery life. I'm a bit ...
- 37
2
votes
1
answer
307
views
3.7- 5v boost converter issue
I am trying to do boost converter with using mc34063 ic for my project. When I simulate the circuit on LTSpice with 3.7V input. I can get 5V output without any problem. However, when I change the ...
- 114
1
vote
3
answers
225
views
MC34063A switching regulator: LC filter and feedback
The MC34063A bust/boost/inverting switching regulator recommends using an LC filter at the output, after the filtering cap. This LC filter is optional and there is no mention in the data sheet about ...
- 63