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The MAX6643LB evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that demonstrates
the operation of the MAX6643LB fan controller.
The MAX6643LB monitors its internal temperature and
the junction temperature of an optional external diodeconnected
transistor. Based on the temperature measurements,
the MAX6643LB generates a PWM waveform
that drives the gate of an external n-channel power
MOSFET, which modulates the cooling fan's power supply,
thus providing automatic fan-speed control.
The high- and low-temperature fan-control thresholds
are easily programmable by connecting programming
pins to ground or supply or leaving them disconnected.
The fan-control algorithm is optimized to minimize the
audible artifacts of varying fan speeds. Fan failure is
detected by monitoring the fan's tachometer output.
Also provided is an over-temperature output with pinprogrammable
threshold.
The EV kit can also be used to evaluate other versions
of the MAX6643/MAX6644 fan-controlling ICs.
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