User`s manual
BL1600 Sinking and Sourcing Drivers s 93
Using Output Drivers
The common supply for all seven channels supplied by a driver chip is
called K, and is labeled as such on header J2. K must be powered up
to allow proper operation.
The K connection performs two vital functions to the high-voltage driver
circuitry on the BL1600.
1. K supplies power to driver circuitry inside the driver chip.
2. K also allows a diode internal to the driver chip to snub voltage
transients produced during the inductive kick associated with switching
inductive loads. (Relays, solenoids, and speakers are examples of
inductive loads.)
Long leads may present enough induction to also produce large potentially
damaging voltage transients. The anodes of the protection diodes for each
channel are common, and so only one voltage supply can be used for all
high-voltage driver loads.
The following points summarize the functions of K.
K provides power to the driver chip circuitry.
K provides clamping for all high-voltage driver loads.
It is mandatory to connect K regardless of whether sourcing or sinking.
The loads supply must have a common ground with all other supplies
in your system.
All loads must use same supply voltage.
Refer to Figure D-4 and Figure D-5 when connecting K.