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.
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Current spike through bootstrap circuitry during turn-on and off of HS FET (GaN FET half bridge dc-dc)
I am looking at the Vds overshoot behavior of Gan FETs through a half-bridge buck boost SPICE simulation. I have been varying gate resistance and parasitic inductance in the power loop. I noticed ...
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Clock feedthrough of the bootstrapped switch
I'm learning about the bootstrapped switch through this paper. Razavi used a 20 µm / 28 nm NMOS (M1) as the main switch to achieve low Ron. I am wondering does this wide device cause any problem ...
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PMDC motor stops spinning when speeding up with pedal
I am driving a PMDC motor with a half bridge circuit in which the low side MOSFET is a freewheel diode and it is always at "on" stage. I am only switching with the high side MOSFET via an ...
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Simulation of high side N-channel MOSFET with Bootstrap in LTspice
The inverter circuit I made from N-channel MOSFETs is given below. I used bootstrap for the high sides. Bootstrap capacitors are C3 and C1.
The gate voltage of the MOSFET is working properly, the ...
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About Bootstrap Driver for PIM module
I'm currently designing a bootstrap circuit for a PIM module drive. The gate driver IC is an IR2136S. This PIM module will drive a motor around 400 V, 10 A @ 5 kHz switching frequency and 3 µs ...
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IR2110 LTspice high-side switching problem
I am working on a half-bridge simulation in LTspice. For the gate drive circuit I am working with an IR2110. My problem is that whatever I select Vin to be above 200 V output, it can't pass 200 V.
I ...
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RP2040 automatic BOOTSEL switching circuit
I enjoy drawing electronic circuits and making them by hand as a hobby. (Not a major, not a job)
While writing a custom board based on the RP2040 chip, I am trying ...
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What are the consequences of small bootstrap resistor (in DC-DC buck/step down specifically)?
If I understand it correctly, a bootstrap capacitor (CB) is used to store energy to turn on the high-side MOSFET (P-channel MOSFET). In DC-DC buck converters (which I use now) this happens several ...
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Bootstrapping circuit vs. charge pump for high side switching
I am designing a circuit where I need to do some high side switching to turn on/off the power to a circuit (part of some protection circuitry). This switching is actually very slow and only occurs ...
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Odd bootstrap design for high-side gate drive
The above circuit utilizes a bootstrap design similar to this next illustration,
Image source: Toshiba - MOSFET Gate Driver Circuit - Application Note
I understand quite well how the capacitor C2 is ...
user349610
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Bootstrap in inverter circuit
I wanted to make a circuit to produce square waves for the transformer. This circuit uses a bootstrap driver for the gate of the MOSFETs. I know the design is very poor but that's just a rough ...
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Configure multiple strap pins with one circuit
I have a PHY that I need to configure in two ways, typically 'strap' resistors are used. In the application I have I don't have a processor on the board and I need to be able to set these straps in ...
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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 ...
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How to calculate bootstrap Resistor in MC34163 Buck configuration
I am designing a DC-DC buck converter with MC34163DWG. I try to understand what value of resistor RB must I use at the buck/step down configuration and I also have questions about the CB capacitor. ...
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Buck Converter Gate-Source Voltage anomaly
I have a desinged a buck converter which has a high side MOSFET, and due that when simulated on ALTIUM the circuit did not work as expected without a bootstrap configuration.
Now with the bootstrap it ...
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