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Remote-Junction Temperature-Controlled
Fan-Speed Regulator with SMBus Interface
Table 14. Fan Manufacturers
Low-Speed Operation
Brushless DC fans increase reliability by replacing
MANUFACTURER
Comair Roton
EBM-Papst
FAN MODEL OPTION
All DC brushless models can be
ordered with optional tachometer
output.
Tachometer output optional on
some models.
mechanical commutation with electronic commutation.
By lowering the voltage across the fan to reduce its
speed, the MAX6660 is also lowering the supply volt-
age for the electronic commutation and tachometer
electronics. If the voltage supplied to the fan is lowered
too far, the internal electronics may no longer function
properly. Some of the following symptoms are possible:
All DC brushless models can be
?
The fan may stop spinning.
NMB
Panasonic
Sunon
ordered with optional tachometer
output.
Panaflo and flat unidirectional
miniature fans can be ordered with
tachometer output.
Tachometer output optional on
some models.
?
?
?
The tachometer output may stop generating a signal.
The tachometer output may generate more than two
pulses per revolution.
The problems that occur and the supply voltages at
which they occur depend on which fan is used. As
a rule of thumb, 12V fans can be expected to expe-
rience problems somewhere around 1/4 and 1/2
their rated speed.
the nature of the tachometer output (open collector,
totem pole) and the resultant levels and configure the
connection to the MAX6660. For a fan with an open
drain/collector output, a pullup resistor of typically 5k ?
must be connected between FAN and VFAN. Note how
many pulses per revolution are generated by the
tachometer output (this varies from model to model and
among manufacturers, though two pulses per revolu-
tion is the most common). Table 14 lists the representa-
tive fan manufacturers and the model they make
available with tachometer outputs.
Pin Configuration
TOP VIEW
Chip Information
TRANSISTOR COUNT: 22,142
PROCESS: BiCMOS
VFAN 1
V CC 2
DXP 3
16 TACH IN
15 STBY
14 SMBCLK
DXN 4
FAN 5
ADD1 6
PGND 7
MAX6660
13 GAIN
12 SMBDATA
11 ALERT
10 ADDO
AGND 8
QSOP
9
OVERT
20
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