Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [totem-pole]

27 questions
14
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2 answers

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 got stuck in my mind. I would like to know why…
hkBattousai
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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 amplification?"
Martino Pistis
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7
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1 answer

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 down affected the circuit, so I implemented a…
Math Keeps Me Busy
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4
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1 answer

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 what I'm trying to do. I am trying to analyses the…
Tony GR
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3
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2 answers

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 to work up to 80 V. Assuming I have selected a…
Hackstaar
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1 answer

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 voltage across R1 i have searched for totem pole…
Zahi Azmi
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3 answers

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 just connect the same circuit three times or…
thijmen321
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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.... things are not going so well. I am working…
T555
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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 current. Can I use cascaded totem-poles to supply more…
hkBattousai
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1 answer

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. Schematic: I use R3 and Q4 to turn off both…
Hamid s k
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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: • Boost PFC • Interleaved boost PFC • …
NoobPointerException
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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 on the base of the circled BJT?
Güven Öztürk
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4 answers

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\$ is 0V. We do have a 24V rail to work with. So…
matth
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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 supply voltage is isolated from inverter's input DC, I…
Das D.
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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 discrete transistors. What could I add or remove to…
Wesley Lee
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