Bootstrap diode gate driver

Some of the DGDXXX series gate drivers come with an internal bootstrap diode Where an external bootstrap diode is necessary, designer should choose its voltage and current ratings appropriately V R rating of the bootstrap diode should be = the voltage rating of the gate driver OR the MOSFETs, whichever is lower. Though the average current flowing though the . The bootstrap circuit is useful in a high−voltage gate driver and operates as follows. When the VS goes below the IC supply voltage VDD or is pulled down to ground (the low −side switch is turned on and the highside switch is turned of f), the bootstrap capacitor, CBOOT, charges through the bootstrap resistor, RBOOT, and bootstrap diode, DBOOT. bootstrap components located near the gate driver IC minimizing any effects of parasitic inductances and reducing the high peak currents path of the bootstrap circuit. It is also important to separate high voltage.

LOW VOLTAGE HALF-BRIDGE GATE DRIVERS THE DIODES ADVANTAGE Source and sink currents up to A Integrated bootstrap diode v logic input control Fast switching 3 x 3 mm footprint TYPICAL APPLICATIONS TYPICAL CONFIGURATIONS The ability to drive two N-Channel MOSFETs in a half-bridge configuration with high-side drive ratings up to V. back to the gate driver supply from the bootstrap capacitor and minimize leakage current. Figure 3, shows the reverse recovery losses when using diodes with reverse recovery times on HB-HS(Ch1). We can observe large amount of over and undershoot on the HB-HS pin which can trigger the driver's UVLO and shutdown the gate driver. Simple in structure, a bootstrap circuit is a step-up charge pump composed of a switch, a capacitor, and a diode, where a voltage equal to the switch voltage (Vin) plus the internal supply voltage is used as the gate drive for the high-side Nch MOSFET. Nch MOSFET, low in on-resistance, helps to improve efficiency and provides a low-cost option.

A bootstrap circuit is used for the gate drive of the high-side (upper-leg) devices of a bridge circuit. When the low-side (lower-leg) device turns on. The bootstrap circuit is useful in a high−voltage gate driver and operates as follows. When the VS goes below the. IC supply voltage VDD or is pulled down to. are discussed; main sections are bootstrap resistor, diode, and capacitor selection, gate driver component selection, decoupling capacitor.