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High Performance Low Cost Gate Drivers [Part 2]


The previous post discussed a simple transistor based inverting MOSFET driver ie. LSIN-BT01. It consisted of a Level-Shifter stage followed by a transistorized totem-pole output stage. This post discusses a NON-INVERTING version of the previous driver. For quick reference this driver is abbreviated LSNI-BT02, meaning Low Side, Non-Inverting, BJT based driver. For more information on abbreviation scheme, refer to

Much of the functioning of both these drivers remain the same, except the fact that LSIN-BT01 produces an inverting output and LSNI-BT02 produces a non-inverting output. In fact, LSNI-BT02 can be thought of as LSIN-BT01 preceded by an extra inverting stage. This additional stage comes at the cost of a higher propagation delay and ofcourse a higher price. Nevertheless, the performance still is in par with the commercially available IC-based drivers.

A snapshot of the specification and the driver circuit is attached below as a picture. The detailed analysis of the circuit can be found in the PDF file (also attached below)


What load capacitance did you use to measure the turn on and turn off times? Did you measure the on/off times with the MOSFETs in place or are these just the rise/fall times of just the driver, ie with no MOSFET connected?
The switching times are stated for the driver only. Additional time will be needed to charge Cgs.
Did you run any test to figure out the rise/fall times for a given Cgs?
Yes, with a 4500pF Ciss, additional 40 to 50 nano-seconds are needed for near complete charging.

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