INDUSTRY COMPONENT

Bootstrap Circuit

Bootstrap circuit for high-side MOSFET/IGBT gate driving in power converters

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Component Specifications

Definition
A bootstrap circuit is an auxiliary power supply circuit used in gate drive circuits to provide floating voltage to the high-side switch in half-bridge or full-bridge configurations. It typically consists of a bootstrap capacitor, diode, and resistor, creating a temporary voltage source referenced to the switching node to drive the high-side gate when the low-side switch is conducting.
Working Principle
When the low-side switch is turned on, the switching node voltage drops near ground, allowing the bootstrap capacitor to charge through the bootstrap diode from the low-voltage supply. When the low-side switch turns off and high-side needs to be driven, the charged capacitor provides floating gate drive voltage relative to the switching node, enabling proper high-side MOSFET/IGBT switching despite the floating reference.
Materials
Ceramic capacitors (X7R, X5R dielectric), fast recovery diodes (Schottky or ultra-fast silicon), PCB with appropriate creepage/clearance, copper traces
Technical Parameters
  • Voltage Rating ≥ (Vcc + Vmax + margin)
  • Operating Frequency Up to 500kHz
  • Reverse Recovery Time <50ns
  • Bootstrap Capacitor Value 0.1μF to 10μF
  • Bootstrap Diode Forward Current 1A to 3A
Standards
IEC 61800, UL 508, IEC 60747

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bootstrap Circuit.

bootstrap circuit gate drive circuit high-side driver MOSFET driver IGBT driver power electronics switching power supply Bootstrap Circuit in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Gate Drive Circuit

Electronic circuit that controls the switching of power semiconductor devices (like IGBTs or MOSFETs) in power conversion systems.

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Engineering Analysis

Risks & Mitigation
  • Capacitor discharge during extended high-side on-time
  • Diode reverse recovery causing voltage spikes
  • Insufficient creepage causing arcing
  • ESD damage to gate driver IC
FMEA Triads
Trigger: Bootstrap capacitor aging or degradation
Failure: Insufficient gate drive voltage causing high-side switch partial turn-on
Mitigation: Use high-reliability capacitors with derating, implement UVLO protection, periodic capacitance testing
Trigger: Bootstrap diode thermal stress
Failure: Diode short circuit causing continuous capacitor discharge
Mitigation: Proper heatsinking, current derating, use of Schottky diodes with lower Vf

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Capacitance: ±10% to ±20%, Voltage: +0%/-10% of rated voltage
Test Method
In-circuit testing of bootstrap voltage during operation, leakage current measurement, thermal cycling test per IEC 60068

Buyer Feedback

★★★★☆ 4.8 / 5.0 (20 reviews)

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"The technical documentation for this Bootstrap Circuit is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

What happens if the bootstrap capacitor discharges too much?

Insufficient bootstrap capacitor charge causes under-voltage lockout (UVLO) protection to trigger, preventing high-side switching and potentially causing shoot-through or improper operation.

How do I calculate bootstrap capacitor value?

Cboot = (Qg_total × N) / (ΔVboot - Vf - Vmin), where Qg_total is total gate charge, N is safety margin (2-3), ΔVboot is allowable voltage drop, Vf is diode forward drop, and Vmin is minimum required gate voltage.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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