Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [bootstrap]

A technique in systems design in which an initial result is fed back into the system to enhance its future operation. This could apply to anything from an analog amplifier to the process of getting software running on a computer.

Bootstrapping or booting refers to a group of metaphors which refer to a self-sustaining process that proceeds without external help. In EE and related fields, the word Bootstrap is used in several unrelated areas.

  • Bootstrap loader (for software or firmware)
  • Bootstrap gate driver (in power electronics)
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Effect of bootstrapping in amplifier circuit

I am trying to understand this "bootstrap bias" amplifier circuit. The picture below is adapted from the book "Transistor Techniques" by G. J. Ritchie: This circuit is a variation of the "voltage divider bias", with the addition of the…
favq
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Bootstrap circuit for high-side MOSFET driver

I am very familiar with the operation of bootstrap drivers on MOSFET driver ICs for switching an N-channel high-side MOSFET. The basic operation is covered exhaustively on this site and others. What I don't understand is the high-side driver…
Dan Laks
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Is there a common name for this [voltage-boosting] circuit topology/idea?

In the OPA454 datasheet I found an interesting circuit idea that I'm not sure what is it usually called (if there is a common name for it). It involves using two opamps to shift the rails of a 3rd one. Note that unlike a bridged [tied load]…
Fizz
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Circuit analysis of a emitter follower with bootstrap

I'm trying to analyse the circuit below (from Art of Electronics, 2nd edition, p. 96). What are the small signal input and output impedance of this emitter follower? I can analyse an emitter follower, but I'm doing something wrong with the…
Henk
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How bad is it to use 1N4007 as a bootstrap?

I have a moderately high power inverter board I've made. Standard 3 phase H-bridge with bootstrapped high side gate drivers. I've built a few, all have worked fine. They've all been pushing many kilowatts for many hours. This one works. The…
David Molony
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Bootstrap circuit function

I have some question about the bootstrap capacitor on a gate driver. First, the bootstrap capacitor is used because the voltage on the high-side driver's gate needs to be about 10-15 V higher than the voltage on its drain. However, if my input…
sean900911
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Cascading common emitter and common collector

I am trying to design an amplifier for a 1 W 8 ohm speaker for educational purposes. The idea is to start from a common emitter amplifier to amplify voltage and then add a common collector (emitter follower) amplifier to amplify power and deal with…
Rojj
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Operating principles of a sawtooth wave generator bootstrap circuit

In one of my assignments, I was asked to explain the working principles of the sawtooth wave generator shown below. The input voltage is a spiked waveform obtained from a differentiator circuit. I realise that the transistor is supposed to act as a…
Tumul Kumar
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Is it safe to "top up" bootstrap capacitors using a charge pump?

This document from TI describes a method to allow use of bootstrapped N-Channel MOSFETS at high duty-cycles, by keeping the bootstrap capacitor "topped up" with an external charge pump, separate from the gate driver IC. My question is: wouldn't this…
user371366
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Does this use of IR2183 as high-side n-channel gate driver work?

I'm building a switching power supply taking 12V to 19V at 3A max out. I've already built one of these using a Schottky diode for the rectifier, but this time I'm thinking of trying a high-side-switched N-channel as the rectifier to reduce losses.…
Jon Watte
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Bootstrapping a high side N-channel MOSFET

Right now I try to reverse engineer a piece of electronic which consists of 3-phase (BLDC) motor driver and a microcontroller with FOC running on it. My goal is to replace that piece of firmware with my own. Until now I have a good part of the…
stowoda
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High-side gate driver application schematic

I'm trying to implement a high-side DC switching device (60 V, a couple of amps) using an N-channel MOSFET driven by a IRS20752L high-side gate driver. The IRS20752L datasheet gives a typical application schematic (below) which I followed but there…
VoltsAndNuts
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Bootstrap capacitor

I am new to electronics could any one explain to me what is the Bootstrap capacitor and what is used for I am doing research about buck convertor using MP1482 chip and I do not understand bootstrap section
Anas Bari
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Cascoded/Bootstrapped Transimpedance Amplifier

I've come across an interesting transimpedance amplifier toplogy, that reportedly reduces voltage and current noise and compensates for large photodiode capacitance. However, as I'm working with an avalanche photdiode, and I need to bias it with at…
joaocandre
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Bootstrapped resistor: a current source or open circuit?

The upper resistor is bootstrapped: \$i_\text{small signal} = \dfrac{v_{in} - v_{out}}{R} = 0\$. According to The Art of Electronics (p. 97) said resistor is a current source (with \$i=0\$A ?). Why is it replaced with a current source instead of an…
Henk
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