Datasheet

Product Data Sheet 4118 N/2H7P
02/01/2019 page 7 of 16
3.3 Electrical Interface - Output
Tacho type /2 (open collector)
Features Note Values
Tacho operating voltage U
BS
<= 60 V
Tacho signal Low U
S low
I sink: 2 mA <= 0,4 V
Tacho signal High U
S high
I source: 0 mA <=60 V
Maximum sink current I
sink
<= 20 mA
External resistor
External resistor Ra from UBS to US required. All voltages measured
to GND.
Tacho frequency (3 x n) / 60
Tacho isolated from motor No
Slew rate => 0,5 V/us
n = revolutions per minute (1/min)
Note to the tacho frequency: 3 pulses per revolution.
When the fan starts up or the rotor is locked the tacho is off. After a successful start-up the tacho output signal turns
on.
3.4 Electrical Features
Electronic function Speed-Controlled
Reversed polarity protection N-CH FET
Max. residual current at U
N
I
F
<= 1 mA