Gideon AnalyticalLaboratories received four National LM5111-1M dual 5A compound gate drivers. Two were failed and two were operational. A gate driver is power amplifier that accepts a low-power input from a controller IC and produces a high-current drive input for the gate of a high-power transistor such as an IGBT or power MOSFET. Gate drivers can be provided either on-chip or as a discrete module. In essence, a gate driver consists of a level shifter in combination with an amplifier.