W83L786R/ W83L786G
+12V
FAN
R1
R2
NMOS
PNP Transistor
C
+
-
PWM Clock Input
D
S
G
+5V
FAN
R1
R2
NMOS
PNP Transist
C
+
-
PWM Clock Input
D
S
G
 
 
Figure 9
7.6.2.3. DC Mode
W83L796R/G has a 4-bit DAC, which produces 0 to 3.3 voltages DC output that provides maximum 2
sets for fan speed control. The analog output can be programmed in the CR 81, and CR 87 (manual
mode). The expression of output voltage can be represented as follows,
 
16
Value
Register
bit
-
4
 
Programmed
VCC
Voltage
 
OUTPUT
?/DIV>
=
 
The application circuit is shown as follow,
+
-
LM358
3
2
1
4
11
33K
FAN
3
2
1
0
IO-12V
47K
NPN
0.1U
IO+12V
IO+12V
R1
C1
Tachometer output
R3
R4
Q1
FANOUT
 
Figure 10
Must be take care when choosing the OP-AMP and the transistor. The OP-AMP is used for amplify the
5V range of the DC output up to 12V. The transistor should has a suitable     value to avoid its base
current pulling down the OP-AMP s output and gain the common current to operate the fan at fully
speed. (For more cost and effort efficient solution please refer to W83391TS/QS  the DC fan pre-
driver that could provide up to 24V gate voltage for external N-channel MOSFET driving)
Publication Release Date: March 06
  - 16 -
Revision0.8
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