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Questions tagged [push-pull]

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2
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0answers
66 views

MOSFET burn down due to droping logic level voltage [duplicate]

I made 2 PCB, one is a logic driver with NAND Schmitt trigger (74HC132D & CD40106B) to drive FORWARD and BACKWARD of H-bridge channel, the other board is the H-bridge Power MOSFET, which used 4 P ...
-1
votes
2answers
107 views

mosfets in h-bridge get hot on idle load

I'm trying to build cheap H-bridge driver to operate under 12-24 input voltage. I used 12v regulator as separated Vgs voltage driver, also to increase load current and I paralleled two MOSFET with ...
0
votes
1answer
119 views

pull-push gate driver for H bridge circuit

To drive power MOSFET following circuits with different pros and cons has been used type A type B type C type c which is called pull-pusher gate driver can used either P or N mosfet in h-...
0
votes
0answers
26 views

Behavior of an ECU Digital Output (0-24V) to another ECU (pull-up i guess) input

Recently i had to control a functionality of an ECU using a separate system (another ECU). ECU "A" provides an input pin which if measured in open circuit shows 12V, so i guess it is a pull-up input. ...
0
votes
2answers
128 views

MC34063 with external FET. Why?

Follow on from : earlier post Below is an LTSpice simulation of an MC34063 step up (5v to 9v) circuit. As you can see, this particular circuit is working correctly, and delivering about 300mA. The N-...
1
vote
2answers
152 views

GPIO push/pull and pull-up resistor?

I have a question regarding the behaviour of a MCU's GPIO pins when configured in a certain way in hardware and software. In this case I am using a dsPIC33EP, but I believe this question is generally ...
1
vote
2answers
379 views

What is the purpose of diodes in parallel with transistors in a solid state relay?

I know the diodes facing each other are for ESD protection, but what do the diodes facing opposite do ? The circuit is basically a 24V (usually used in industry) digital output.
0
votes
2answers
162 views

connecting Open drain and Push pull outputs to drive the same pin

I am designing a circuit in which has a voltage supervisor (MCP121-33)with active low output nRST connected to RESET input of the microcontroller which is straightforward. Also, there is a another ...
0
votes
2answers
147 views

Ferrite core selection for boost converter using push-pull topology

I'm trying to build a boost converter with the following specifications. Switching Frequency: 100 kHz Maximum Input Voltage: 14 V Nominal Input Voltage: 12 V Cutoff Input voltage: 10.5 V Power ...
0
votes
1answer
85 views

Push-pull amplifier

The question is concerned the output current of push-pull amplifier once the over-current protection is activated. The resistor Rs(one between base and emitter of the over-current protection ...
1
vote
1answer
118 views

Push-pull MOSFET gate schematic

So I was looking through the MAX713 datasheet and came across the schematic below. In short, MAX713 is a NiCd battery charging IC and below is shown the schematic for it in the the switching mode. The ...
0
votes
1answer
32 views

L9110 output stage

Does L9110 have a push-pull or open-drain output stage? As I have measured the output voltage decayed slowly from High to Low when light load is attached and inputs inverted. I would expect a sharp ...
0
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0answers
302 views

Push-pull converter transformer calculation

every one, I am an automation engineer, not an electrical, but I have some knowledge about electricity (I hope). I am designing a power supply with input voltage of 3,1V and the output voltage of 175V ...
0
votes
1answer
101 views

level shifting 5V pulse to 12V pulse

When I search for level shifting 5V pulse to 12V, I came to know about the circuit given below. It is simply based on a push-pull amplifier configuration as you all know. And what I have understood ...
0
votes
0answers
132 views

Equivalent load resistance, AC and DC load lines for push-pull class A amplifier

I have a question which is about a class A push-pull amplifier as shown below, but I am not sure with my ideas: I could find Icmax and Icmin in part a), which are 240mA and 80mA respectively. As ...
0
votes
3answers
372 views

Pull-down resistor confusion

I can't seem to find decent information on this topic as all articles only explain general concepts of pull-ups and pull-downs or only cover pull-ups in greater depth. I understand the general ...
8
votes
1answer
242 views

Unkown distortion in low power push-pull amplifier

I'm trying to make a small headphone amplifier, and I started out simple: I'm using a LM358 opamp to drive a push-pull stage with a pair of BD transistors. I started by trying a single channel (only ...
0
votes
0answers
85 views

How can I calculate the input capacitance required for a push-pull step up converter?

How can I calculate the input capacitance required for a push-pull step up converter? Vin - 12V (dc source) Accepted Vin ripple = 100mV Duty Cycle = 50% Switching frequency = 300kHz Vout = +12V and -...
3
votes
1answer
2k views

Difference between Push-Pull and Totem-Pole

I can't understand/see the difference between a push pull, for example a circuit like that: And a Totem-Pole: Have these circuit a transistor in the input so for get a thing like "double ...
0
votes
0answers
307 views

Unable to drive N channel mosfet [low side] for high power DC motor control ,using ir2101

below schematic is of 2.4Hp Dc motor driver circuit implemented for a electric drive concept. Motor is being controlled on low side of Irf540 nchannel mos.5v pwm signal is fed to opto coupler and then ...
0
votes
2answers
169 views

Push-pull amp in class A what it mean

I take next sample schematic. This is only an output stage of any real power amplifier. It's clear when it's work in B-class the every BJT amplify only one half of input signal. But what it means if ...
6
votes
2answers
306 views

What is the easiest way to reduce quiescent current in a AB power amp?

I'm trying to design an push-pull amplifier for a 4 ohm load, it works with a 48 V source. This is the latest design I did: (Input and output are in those two capacitors and the potentiometers are ...
1
vote
2answers
652 views

Difficulties in biasing MOSFET push-pull amplifier

Everything works perfectly well and following the expected in the simulations on MultiSim. This is what the test-version of my circuit project looks like: I made this version of the circuit to ...
1
vote
2answers
588 views

Problems in push-pull biasing

I'm trying to make a push-pull audio amplifier with a pair of power darlingtons (TIP142 and TIP147), but i'm having problems with the biasing. Here's the diagram of one of its configurations: Here i'...
0
votes
1answer
361 views

What is a common-emitter bjt push-pull output stage?

My professor mentioned it briefly in class, and I've been googling it and all I find is the CC output stage. Can anyone show me a picture of this configuration and maybe describe how it works? Can you ...
0
votes
3answers
136 views

What is the meaning of “ground” and “-V” in a simple push-pull circuit?

In this simple "push-pull" circuit, there are +V, -V and ground connections. up until now, i always considered ground to be the minus side of the battery. but that is also the way i understand -V, so ...
5
votes
1answer
124 views

MHz gate switching: choosing BJTs

I'm trying to build a discrete driver to switch a power transistor (Qg=12nC, Vg=0->6V). I want to push the limits to see what is possible with discrete components (so no driver IC) so I'd like it to ...
0
votes
0answers
56 views

FT231X SLEEP# Pin configuration

I went thru documentation for FT231X, and I can not get it working as described in documentation. I'm trying to use battery charging detection feature. According to this, I've enabled Battery Charge ...
0
votes
0answers
195 views

Totally Isolated Push Pull SMPS Transformer Saturation and Duty Cycle

Circuit spec: no feedback, unregulated, no current mode control push-pull driver and toroidal transformer, split primary, single secondary, 12vdc input, 2vdc output, frequency of operation yet ...
0
votes
0answers
119 views

Pulse generator with independent control of high level and low level of the pulse

I want to design a pulse generator with independent control of high level (0 to Vcc) and low level (0 to Vcc) of the pulse (maximum from Vcc to -Vcc). I have used an AB class push-pull amplifier, as ...
0
votes
2answers
262 views

High-side switch Vs Complete mosfet push-pull configuration to drive an inductive load

In my application, a microcontroller with 5V logic needs to drive two 12V DC fans in voltage. The microcontroller will use a PWM drive signal with a carrier frequency of 32 kHZ. For several reasons, I ...
1
vote
2answers
277 views

Pull-up resistors needed for quasi-bidirectional push-pull PCF8575/PCF8574(A)

I wonder if I need pull-up resistors when using the PCF8575 I/O extender. It's not directly mentioned in the datasheet (http://www.ti.com/lit/ds/symlink/pcf8575.pdf). The datasheet does remark that ...
0
votes
0answers
85 views

Push-pull mechanism

I'm new here and I'm sorry if this question is inappropriate. I'm trying to build refreshable braille display that will be placed inside of a desk, so I have a lot of vertical space. To build display ...
2
votes
4answers
1k views

How to keep the bias current constant in class AB output stage?

I am working on a hobby project to build a small audio amplifier. Actually the idea behind the circuit is to build a 0.5W-1W audio amplifier that can be powered from a single 9V battery and have ...
0
votes
2answers
324 views

Basic questions regarding Push Pull stage

I am confused as to how the following circuit will work(????) Lets assume that there is no AC signal and only a DC signal is applied. According to the books this is a voltage follower stage i.e Vo ...
3
votes
1answer
130 views

Synchronous buck using BJT's in stead of MOSFETS

Recently I came across a schematic of a synchronous buck converter using normal transistors in stead of MOSFETS, like this: I was always under the impression that when the top switching device turns ...
1
vote
5answers
310 views

Noisy BTL Audio Amplifier Circuit

I designed and breadboarded a simple audio amplifier circuit and when I play audio through the speaker, it is pretty noisy and very quiet. The +5V is being supplied from a USB port. I'm still probing ...
0
votes
3answers
563 views

Push-pull amplifier oscillation

I try to build simple unitary push-pull amplifier which amplifies also DC. Here is a result of my work: Unfortunately high frequency oscillation effect occured due to strong negative feedback: My ...
0
votes
1answer
649 views

Push-pull configuration using ZXMC4559DN8TC

I'm testing this circuit and I found some issues in driving ZXMC4559DN8TC n-p channel MOSFET. simulate this circuit – Schematic created using CircuitLab I have some problem in driving ...
0
votes
3answers
642 views

Optimal design choices for mosfet driver for DC-DC step-down converter

I'm dealing with an application in which a DC-DC converter is used to transform an input voltage of 15V DC into lower voltages. The current configuration makes use of an LM27222 with two mosfets in ...
1
vote
1answer
76 views

Amplifier output goes haywire with load attached

I'm trying to create an op amp using FETs and BJTs. I need the gain to be over 500, currently without a load attached I have the gain about 1000. The input is a 0.05V sine wave, the output is ...
-4
votes
2answers
181 views

bjt audio amp push pull “super complimentary” [closed]

I found here this super complimentary design: http://www.valveradio.net/audio/super-complementary-stage.html To improve the symmetry of a complementary push-pull output stage, a special "super ...
0
votes
1answer
330 views

How can inductance affect push pull converter?

I'm trying to figure out the effect of adding inductance to a push pull topolgy but there are many parameters and I got confused. First of all, considering the previous basic circuit, What limits the ...
1
vote
3answers
118 views

When two transistors connected which one is on and which one is in cutoff from given circuit condition?

here in this question's solution, given that upper BJT is on while lower one is in cutoff region for Vbb = 2.7 V and viceversa for Vbb = -2.7 V and both will be in cutoff for 0 V. While in other ...
6
votes
4answers
799 views

Push-pull power amplifier on complementary darlingtons

I decided to make a power DC-amplifier. I used complementary darlington pair TIP142 and TIP147. Also TL082 used for negative feedback. The schematic is as below: I gave 100 kHz sine signal and under ...
3
votes
1answer
103 views

3.3V pullups in a 5V signaling system

I have an old design, since 1999 approximately, with an old FPGA XCS30XL and old MCU6840 MCU. They are connected together via a parallel bus peripheral and both utilise and power off 5V. But there is ...
0
votes
1answer
98 views

Emitter follower with extra load in emitter path

I was reading through Linear Technology's AN70 application note and on Figure 42 there are two parts of the circuitry that I can't understand. It looks like an emitter follower but there is a ...
3
votes
2answers
265 views

cmos push-pull configuration

Why here http://www.talkingelectronics.com/projects/MOSFET/MOSFET.html they say that push-pull configuration with high-side transistor as PMOS and lowside as NMOS is incorrect? I have found many ...
0
votes
2answers
359 views

Push Pull Converter Transformer Saturation Rating

How do you determine the required saturation rating for a transformer to be used in a push pull converter? Can a transformer in this topology pass more than the saturation rating since it is not ...
4
votes
1answer
753 views

Eliminating MOSFET drain voltage spikes in a push pull power supply

I have built several TL494 based circuits now. Previously I have had issues with severe ringing of the MOSFET gates, but that seems to be a non-issue now. Here is the schematic, pretend the DIP16 is ...