ULN2803 is
a High voltage, high current Transistor Array IC used especially with
Microcontrollers where we need to drive high power loads. This IC consists of a
eight NPN Darlington connected transistors with common Clamp diodes for
switching the loads connected to the output. This IC is widely used to drive
high loads such Lamps, relays, motors etc. It is usually rated at 50v/500mA.
This article brings out the working of ULN2803 IC and how to use it in a
circuit.
Purpose of ULN2803:
Most of the
Chips operates with low level signals such as TTL, CMOS, PMOS, NMOS which
operates at the range of (0-5)v and are incapable to drive high power inductive
loads. However this chip takes low level input signals (TTL) and uses that to
switch/turn off the higher voltage loads that are connected to the output side.
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