Description

The FAD1110−F085 is designed to directly drive an ignition IGBT

and control the current and spark event of the coil. The coil current is

controlled via the input pin. When the differential input is driven high,

the output of the FAD1110−F085 is enabled to turn on the IGBT and

start charging the coil.

An input spike filter suppresses differential input signals of less then

13 s in duration. A Max Dwell timer is included in the

FAD1110−F085 which will turn off the IGBT if the input stays active

for longer than the programmed time. This time interval can be

modified through an external capacitor. When the Max Dwell timer is

exceeded, the FAD1110−F085 will enter a Hard−Shut−Down mode

(HSD) and turn off the IGBT immediately. The FAD1110−F085 will

also limit the collector current of the IGBT to IC(lim) during charging.

This again is done through the sense resistor in the emitter leg of the

Ignition IGBT developing a signal input to the VSENSE pin of the

FAD1110−F085.

Features

• Differential Input for Ground Shift Disturbances Suppression

• Signal Line Input Buffer

• Input Spike Filter

• Operation from Ignition or Battery Line

• Ground Shift Tolerance − 2 V to 3 V

• Programmable Maximum Dwell Time

• Control IGBT Current Limiting through VSENSE Pin

• Hard Shutdown Following Max Dwell Time Out

• This is a Pb−Free Device

Applications

The FAD1110−F085 is an advanced Ignition IGBT control IC

available in a SO8 package or die sales. This full featured Smart

Ignition IGBT Driver is particularly advantageous in “switch on coil”

applications where size and system performance of the ignition driver

are important.