DS3668 DS3668 Quad Fault Protected Peripheral Driver Literature Number: SNLS351A DS3668
Quad Fault Protected Peripheral Driver
General Description Applications The DS3668 quad peripheral driver is designed for those
applications where low operating power, high breakdown
voltage, high output current and low output ON voltage are
required. Unlike most peripheral drivers available, a unique
fault protected circuit is incorporated on each output. When
the load current exceeds 1.0A (approximately) on any output
for more than a built-in delay time, nominally 12 Вµs, that
output will be shut off by its protection circuitry with no effect
on other outputs. This condition will prevail until that protection circuitry is reset by toggling the corresponding input or
the enable pin low for at least 1.0 Вµs. This built-in delay is
provided to ensure that the protection circuitry is not triggered by turn-on surge currents associated with certain
kinds of loads.
The DS3668’s inputs combine TTL compatibility with high
input impedance. In fact, its extreme low input current allows
it to be driven directly by a MOS device. The outputs are
capable of sinking 600 mA each and offer a 70V breakdown.
However, for inductive loads the output should be clamped
to 35V or less to avoid latch up during turn off (inductive
fly-back protection — refer AN-213). An on-chip clamp diode
capable of handling 800 mA is provided at each output for
this purpose. In addition, the DS3668 incorporates circuitry …
