Questions tagged [totem-pole]
The totem-pole tag has no usage guidance.
27
questions
7
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Active pull-down in LSTTL totem-pole output
The lower totem-pole transistor of a LSTTL IC frequently has an active pull-down from base to emitter (ground). Here is an example from TI's SN74LS93 datasheet.
I was curious how this active pull ...
- 20.3k
0
votes
2
answers
116
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The resistor is over heated in my totem pole circuit
This is my totem pole circuit:
It works well, but R32 is too hot.
This is scope:
I changed R32, R34to 470 ohm, but I got the same result:
I think the resistor value is the problem. How can I fix ...
- 67
1
vote
1
answer
204
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Totem pole MOSFET driver does not turn off
I'm trying to drive a 12-24 V DC motor with MCU PWM output. My design is based on a totem pole gate driver
First I use a voltage divider to provide the full-on gate voltage (10 V) for my power MOSFET.
...
- 195
1
vote
1
answer
119
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Selecting PFC topology
I'm considering different PFC topologies for the AC-DC stage of a device around 1 kW with aim of optimizing for efficiency and secondarily component size. This far I have identified following options:
...
0
votes
1
answer
442
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EGS002 48 to 220 V inverter using IGBTs [closed]
I'm trying to build a 48 to 220 V inverter using IGBTs.
The problem is that when I put on a resistive load (1500 W tea kettle) it works fine, but when I put on a inductive/capacitive load (1000 W arc ...
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1
vote
2
answers
217
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BJT circuit with totem pole output
In the circuit above, I don't understand how to close and open the BJT that I circled.
To be specific, I think that when I give input 1 the circled BJT should be opened, but how? What is the voltage ...
- 11
0
votes
1
answer
391
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36V P-MOS - PWM driver circuit - totem pole - reduce BJT peak power
I want to use a totem pole BJT driver for a P-channel MOSFET.
Various google searches brought me to the following circuit:
In Olin Lathrop's answer to this question it is quite well described.
pull-...
- 1,792
0
votes
1
answer
115
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Reproducing ST Design Gate Driver
I try to reproduce the buck-boost converter from the "STM32F334 Discovery" board.
Therefore I have drawn a KiCad Schematic and assigned the appropriate spice models.
But unfortunately, I'm ...
- 1
1
vote
4
answers
944
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How to generate opposing outputs at 24V from 3.3V control signal
We have a set of 4 control signals at 3.3V.
For each of these control signals, we want to generate a pair of output signals. For example, if \$control_1\$ is high, then \$out_1\$ is 24V and \$out_1inv\...
- 117
0
votes
1
answer
223
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Totem pole driver topology (inverting amp)
Hello guys this question is regarding a gap in my knowledge regarding transistors specifically the driver of the totem pole configuration. Based on the following figure
And these results here:
When ...
- 3
0
votes
1
answer
1k
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How to make IGBT/MOSFET gate driver circuit (5-10V) using push pull with transistors
I was trying to drive the gate of 25N120 IGBT (2800pF gate capacitance) with the help of transistors. The working voltage is 10V. I have tried with BC548 NPN and BC558 PNP.
Everytime I apply PWM, the ...
0
votes
1
answer
254
views
Gate Driver Circuit Gives Unexpected Results!
I have designed around the LM5106MM/NOPB gate driver. Used two IPB017N10N5ATMA1 N-CHANNEL MOSFETS. This circuit has actually been used in another design in production by a engineering group beyond my ...
- 183
0
votes
0
answers
518
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Totem pole Bjt based Mosfet Gate driver
I need to design a totem bole bjt based gate driver for Mosfet IRF640, which is going to be used in a Buck converter.
I know the peak gate charging current= 1A.
I've already selected my ...
- 366
3
votes
2
answers
2k
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High-voltage totem pole driver
I have the following MOSFET driver circuits for high side P-channel MOSFETs. The circuit works for supply voltages up to 20 V. It gives some satisfactory results for its range, but I would like for it ...
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1
vote
1
answer
672
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Inverter Mosfet Driving with Isolated Totempole Supply
simulate this circuit – Schematic created using CircuitLab
I'm trying to make an inverter and I'm driving my mosfets with totempole configuration, the thing that confuses my mind is:
Totempole ...
- 189
3
votes
1
answer
2k
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Totem Pole / Push Pull Circuit is not working properly
I have a simple switching circuit around 500Hz with 120V supply using Push Pull mosfet with high resistive load showed below
but the output was not as expected, like this
the blue line is the ...
- 149
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votes
3
answers
32k
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Difference between push-pull and totem-pole
I can't understand/see the difference between a push-pull and a totem-pole output.
Push-pull:
Totem-pole:
Do these circuits have a transistor in the input for something like "double ...
- 309
0
votes
1
answer
237
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High speed parameters for transistor [closed]
How to choose a Bipolar Junction Transistor (BJT) for a switching frequency of 400KHz.
- 238
4
votes
1
answer
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TTL NAND gate (totem pole) current and voltage analysis
I am working on a few practice problems for my course and I am unsure about my working throughout.
hoping for some feedback and guidance from the community as it's not my strongest topic.
Here is ...
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3
votes
3
answers
4k
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Driving a 12V LED strip with an Arduino
I have 60 watt LED strip I want to control with an Arduino (the Genuino Mega 2560 actually). I found this tutorial which shows you how to do it for a white LED strip, but I am not sure whether I can ...
- 137
3
votes
2
answers
1k
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Original 555 timer transistor output implementation
I am a beginner casual electronics hobbyist trying to learn about how chips work internally. In order to accomplish, this I went out and got a 555 timer soldering kit and started experimenting with it....
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2
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4k
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Totem pole vs open collector configuration
Can anyone please explain for power consumption view point only whether totem pole or open collector should be preferred with a bit explanation?
- 11
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2
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1k
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Criticize Totem pole + Level Shifter topology
I'm designing a FET gate driver that allows 1.8V MCUs to control FETs up to 100kHz.
FETs to be used will vary a lot so I'd like to have as much current drive as I can.
I need it to be based on ...
- 7,864
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2
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331
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Achieving higher current at the lowside MOSFET to pulse LED
I have attached the following circuits which i have been developing overtime.
The OBJECTIVE is to get as high as possible a current at the gate of the MOSFET (VF1) to achieve faster pulse times of ...
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2
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1k
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Can I create a totem-pole structure by using two optocouplers?
I have two optocouplers. One of them uses NPN transistor and the other one uses PNP. Each of them explicitly give the base pin of their BJTs out. Can I make a totem pole structure by connecting them ...
- 13.9k
2
votes
1
answer
1k
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Using cascaded totem-pole structures to supply more current for gate driving
simulate this circuit – Schematic created using CircuitLab
I want to drive a totem-pole structure with a logic gate. The problem is, the logic gate can only supply 8.8mA output sink/source ...
- 13.9k
14
votes
2
answers
12k
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Why doesn't shoot-through occur on totem-pole structure?
I'm designing a totem-pole by BJTs in order to drive a MOSFET. I studied on several online examples and built up my circuit according to what I understood from them. However, there is a detail which ...
- 13.9k