Key facts
- Brand
- Fairchild
- Model
- AN-6076
- Category
- Other Electronics
- Documents
- 2
- Languages
- EN · ZH
- Last added
- 2012-08-01
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Fairchild Semiconductor AN-6076 Bootstrap Circuit Design Guide
This document provides a systematic approach to designing bootstrap gate drive circuits for high-frequency, high-power, and high-efficiency switching applications using power MOSFETs and IGBTs. It focuses on the bootstrap power supply technique, which is widely used for its simplicity and low cost in high-side gate drive circuitry.
The guide analyzes the operation of the bootstrap circuit, including the charging of the bootstrap capacitor through a resistor and diode. It details the limitations of this technique, such as duty-cycle restrictions due to capacitor refresh requirements and issues arising from negative voltage transients at the source terminal. The document also covers potential problems like latch-up caused by parasitic elements and provides theoretical extremes to understand the relationships between excessive undershoot and latch-up mechanisms.
Fairchild AN-6076 specifications
| Bootstrap supply voltage (Vpp) | 15 V |
|---|---|
| Recommended bootstrap capacitor range | 100 nF – 570 nF |
| Bootstrap resistor typical range | 5 Ω – 108 Ω |
All Fairchild AN-6076 documents by type
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What is the primary purpose of this application note?
The document demonstrates a systematic approach to design high-performance bootstrap gate drive circuits for high-frequency, high-power, and high-efficiency switching applications using a power MOSFET and IGBT.
From: Fairchild Semiconductor AN-6076 Bootstrap Circuit Design Guide
What is the main advantage of the bootstrap power supply technique?
The bootstrap power supply technique has the advantage of being simple and low cost.
From: Fairchild Semiconductor AN-6076 Bootstrap Circuit Design Guide
What limits the duty cycle of a bootstrap circuit?
The duty cycle is limited by the time required to recharge the bootstrap capacitor.