Questions tagged [mc34063]

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2answers
95 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 ...
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2answers
74 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 ...
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1answer
38 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 ...
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1answer
39 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 ...
1
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1answer
151 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 ...
0
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3answers
419 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 (...
0
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1answer
222 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 ...
0
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1answer
502 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 ...
0
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1answer
286 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 ...
1
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0answers
428 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 ...
1
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2answers
1k 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 ...
1
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3answers
590 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 ...
0
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2answers
314 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 ...
1
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2answers
374 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 ...
1
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1answer
2k 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 ...
7
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1answer
645 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 ...
2
votes
1answer
400 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 ...
3
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1answer
423 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 - ...
1
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1answer
2k 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 ...
1
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2answers
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 ...
4
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1answer
1k 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 ...