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Questions tagged [mc34063]

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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 ...
Loic Daigle's user avatar
1 vote
1 answer
124 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 ...
AKTanara's user avatar
  • 291
1 vote
1 answer
43 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 ...
Julian F. Weinert's user avatar
0 votes
0 answers
65 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 ...
Multicharger's user avatar
3 votes
3 answers
450 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 ...
Vasiliy's user avatar
  • 85
0 votes
0 answers
102 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?
NI3's user avatar
  • 1
2 votes
1 answer
207 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 ...
Ritz123's user avatar
  • 21
0 votes
1 answer
231 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 ...
Rafael Mattei's user avatar
1 vote
2 answers
255 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 ...
Ivan Demyachenko's user avatar
0 votes
2 answers
385 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 ...
Benito's user avatar
  • 41
0 votes
2 answers
402 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, ...
Amogh Jain's user avatar
0 votes
1 answer
203 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 ...
RM429's user avatar
  • 37
2 votes
1 answer
261 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 ...
ratatosk's user avatar
  • 114
1 vote
3 answers
162 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 ...
jorpese's user avatar
  • 63
2 votes
2 answers
171 views

Buck Converter Capacitor and Inductor Characteristics

I'm trying to make a buck converter with this mickey-mouse MC34063A chip that will step-down +5V to +3V3 up to 500 milliamps. I've gone through the calculations by hand and validated them with an ...
jm567's user avatar
  • 187
2 votes
5 answers
4k views

MC34063 based converter accoustic noise

I am trying to make nixie clock and I use MC34063 for buck/boost converters. The nixie tubes require 180 V to operate and the microcontroller and LEDs need 5 V. I use external 20 V power supply as a ...
George's user avatar
  • 245
0 votes
1 answer
694 views

MC34063A - 3.7 to 1.5 buck converter voltage rises when load applies

I designed and created this circuit to get 1.5 V out of 18650 lithium ion battery cell (with protection board). Circuit is built to use in a toy, so not a serious use. It shows open circuit voltage ...
Junaid's user avatar
  • 303
2 votes
1 answer
516 views

MC34063A step up voltage converter

i need change 5v to 12v that it use to supply a device; for this use MC34063A step up voltage converter; this site can calculate the parameter. i have problem all thinks is OK but i have same voltage ...
Mahdi KhosroAnjom's user avatar
2 votes
2 answers
398 views

Power Supply : How to keep SMPS always above the post-regulator that follows it

I'm trying to find a way of building a new power supply for my workshop, in order to keep it small and not so hot I will be using a spare xformer to step down mains to 24v and then a variable buck ...
k_orolev's user avatar
  • 261
1 vote
2 answers
695 views

MC34064 Step-Up Regulator Design

I have a 7.4V battery supply which will gradually discharge and reduce until at about 5V I won't have enough power for my device anymore. Ideally, I need to maintain a 7V (+/- 0.5V) supply rail ...
user avatar
0 votes
1 answer
134 views

How to connect a rectifier circuit (mains driven) with switching regulator MC34063?

I am designing a switch mode power supply (44 VDC, 0.56 A, 24.5 W) for my passive PoE. I am using 220/24 VAC transformer + Schottky bridge rectifier (MBRS360) +Pi filter producing ...
Tayyeb's user avatar
  • 1
0 votes
1 answer
110 views

Determine MC34063AP Duty Cycle

A fuzzy area I want to clear up on the MC34063AP is Duty Cycle. In the MC34063AP datasheet, toff an ton are a result of 1 / f, which is obvious. toff is calculated by: 1 / f / ton / toff + 1 ton ...
Rusty Nail's user avatar
2 votes
1 answer
595 views

MC34063A Poor load regulation in case of boost and buck converters

I'm using following circuit for a boost converter using MC34063A IC. The circuit is designed for 24 V, 250 mA output. The simulation works fine but the actual circuit on a PCB behaves weirdly. In ...
Salman's user avatar
  • 65
0 votes
3 answers
1k views

mc34063 boost converter - low performance and noise on avr interrupt

I have some problem with my nixie project. 1 - my mc34063 boost converter have poor performance. While i use active pull down D3 and Q2 for driving my mosfet then its enough for only one nixie tube (...
Dobijasek's user avatar
0 votes
1 answer
605 views

MC34063 inverter stops switchng at low current and burns out through inductor

I fried a few MC34063 on the breadboard this evening.... was trying to make a 10V to -15V inverter to supply 30mA. It was working fine. However, the chips and inductor suddenly became hot when ...
Indraneel's user avatar
  • 2,177
0 votes
1 answer
864 views

Fuzzy 3.3V from MC34063

Recently I've made simple buck regulator based on MC34063 from TI. I want to use that to power my SMT32 base application. Voltage on input varies from 9-26V. I've put some part on general purpose ...
kaziel's user avatar
  • 11
0 votes
1 answer
389 views

Step-Up from 12V to 15V using MC34063

can someone help me out with using the MC34063 ic, i have a 12V battery and need to have 15V to power 7 LEDs in series (many LEDs altogether). Ive used a couple of online calculators and an offline ...
Seeker's user avatar
  • 65
1 vote
0 answers
795 views

MC34063 boost converter + PWM dimmer unstable output problem

I use NE555 & MC34063 to build a LED driver with dimmer function. The crcuit of NE555 , MC34063 & LED are bridged by a IRF640N NMOSFET. NE555 is responsible for adjusting the brightness and ...
Bruce Hsu's user avatar
1 vote
2 answers
2k views

MC34063 help - step-up with an external switch

I'm attempting to design a ~200V, relatively low-current (10mA expected, I'm allowing a bit more though) power supply for some Nixie tubes, and I've decided on using an MC34063 step-up converter. It ...
felixphew's user avatar
  • 445
1 vote
3 answers
1k views

MC34063 heating & low performance problem

I designed below circuit to provide 45V/200mA for a LED ceiling lamp. First, I built it on breadboard. Everything was fine. No voltage drop. MC34063 was warm and transistor TIP31C was hot but can ...
Bruce Hsu's user avatar
0 votes
2 answers
501 views

Powering up MC34063 circuit with transformer

I am having an issue with the circuits that I am working on in Multisim. The first one is supposed to convert 24VDC into 27VDC/200mA. And it is working just fine. When I substitute VDC source with ...
Lee Brown's user avatar
2 votes
2 answers
499 views

Double polarity pulse with one single power source and virtual spdt switch

I have a problem in the design or my circuit. I need send data at a maxixum bitrate of 12000 bits /second. The high value should be +12v and the low value should be -12v providing at least 35mA of ...
smitchel's user avatar
2 votes
1 answer
4k views

MC34063 P-MOSFET driver?

I've got a successful buck converter design using an LM3485. It's got a MOSFET gate driver output pin that swings between Vin and Vin-5V - perfect. My MOSFET is a SQ1431EH-T1-GE3. It has a maximum Vgs ...
nsayer's user avatar
  • 1,573
7 votes
1 answer
1k views

Step-down with external mosfet - why heavy current surges?

I built this circuit, which is supposed to deliver currents up to 20 amps (when everything else works...). The purpose is (eventually) to build a constant current source (as opposed to a constant ...
jjstcool's user avatar
  • 484
3 votes
1 answer
693 views

Confusion with MC34063 Vsat

I'm currently designing an e-ink panel driver. My choice is MC34063 for generating required voltages and I want to use two of these for step-up and inverting converters. However I'm somewhat confused ...
Lisu's user avatar
  • 53
3 votes
1 answer
643 views

MC34063 issue. Switches off every cycle

I am using MC34063 in step down configuration but the converter switches off every cycle. Following are the calculations and specifications: Vin - 9 to 12V Vout - 5V Imax - 0.3A Rsc - 0.36 ohms L - ...
karanbanthia's user avatar
1 vote
1 answer
3k views

Boost with mc34063

I'm trying to get 19V / 3.5A supply From 12V battey, I made a boost converter circuit using mc34063 ic, The simulation of the circuit was perfect and I got 19V/3.7A as output, This is my circuit But ...
Waleed Saydi's user avatar
1 vote
2 answers
2k views

MC34063 dc-dc inverting - capacitor question

For a project I try to build a dual supply for opamps in a device. I bought the MC34063 to invert the DC. The device should be portable, however, the standard schematic in the datasheet uses some very ...
user43756's user avatar
5 votes
1 answer
2k views

MC34063 Switching Regulator IC: When was it introduced?

I'm a bit curious when the classic MC34063 IC was introduced, today available as the -A version (MC34063A). I'm trying to get an idea when some of the classic switching controller ICs were introduced ...
zebonaut's user avatar
  • 18.4k