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February 2017
DocID030070 Rev 1
1/21
www.st.com
AN4966
Application note
Design guidelines for the shutdown function in the
SLLIMM-nano series
Carmelo Parisi, Antonino Raciti
Introduction
The SLLIMM™-nano 1
st
and 2
nd
series consist of two product families of compact, intelligent power
modules offering several advanced functions and protection features such as an op-amp for advanced
current sensing, NTC thermistor for temperature monitoring, interlocking function to prevent shoot-
through, undervoltage lockout, comparator for fault protection against overcurrent or short-circuit and
smart shutdown function.
The smart shutdown function is based on innovative patented circuitry internally connected to the
comparator, which provides intelligent fault management and greatly reduces delays in protection
intervention.
Both SLLIMM-nano families are equipped with three half bridge IC gate drivers. There is just one
comparator input pin (CIN) which is directly connected to the U IC gate driver and one shutdown pin
( SD / OD) which internally connects all three IC gate drivers. In order to take advantage of the smart
shutdown function and to perform very fast, effective overcurrent protection on all legs, an external RC
network on the SD / OD pin must be added and properly designed.
This application note will describe the how the smart shutdown (SSD) function and the shutdown (SD)
work, while providing guidelines for proper external hardware design to implement active overcurrent
protection.
