AN556

w w power The superior performance of voltage controlled switch makes this device the preferred one in modern electronics applications. The L6353 is a new monolithic integrated circuit designed to realise a versatile and smart interface between the signal circuitry and every kind of voltage controlled power switch, with a minimal design time and a reduction of parts count. Device Description The L6353 is a smart silicon device which integrates all the circuitry for a versatile and rugged gate driver. The chip implements several features such as: an easy-to-link signal source by means of either an optocoupler or pulse transformer, a two-step turn-on procedure of the external power switch (dedicated to IGBT driving), a switch dropout voltage monitoring, the possibility to give a negative bias to the gate, the external programmability of safety thresholds and delays, the syncronisation and edge aligning and a powerful buffer of ±8A with split output. To introduce the device see fig.1 which shows the functional diagram: Figure 1. L6353 - Functional diagram at .D w h S a ee U 4 t m o .c AN556 APPLICATION NOTE THE L6353: A SMART GATE DRIVER by: C. Adragna and G. Comandatore 2.5V 300mA SELECT + 1.25V - INPUT w INV-OUT ALARM w + - w t a .D FILTER 200ns 3.75V S a DELAY e h + - U 4 t e .c m o Supply UV Lockout References REF VPOS OUT1 OUT1 CLAMPING CLAMP-PROG OUT2 LOGIC 3.15V THERMAL SHUTDOWN - VSS 3.15V MON-DELAY + - 1.25V + 3.75V VON-SENSE + ON-LEV-PROG...