UG534 Datasheet, PDF (74/96 Pages) –

Chapter 1: ML605 Evaluation Board
Fan Controller
In highly demanding situations, active thermal management in the form of a heat sink and
fan may be required. In order to support this, drive circuitry for an external fan has been
provided on the ML605. A fan with tach output can be connect at header J59 as shown in
Figure 1-32. The fan PWM signal is generated by the FPGA and the tach input can be used
to close the control loop and regulate the fan speed. Alternatively, the FPGA temperature
as recorded by the System Monitor can be used to close the PWM control loop for the fan.
X-Ref Target - Figure 1-32
VCC12_P
J59
GND
1
12V
2
3
Tach
VCC2V5
R367
10.0K
1%
1/16W
SM_FAN_PWM
R369
10.0K
1%
1/16W
2
Q24
0
13
4
NDT3055L
Figure 1-32: ML605 Fan Driver
SM_FAN_TACH
R358
4.75K
1%
UG534_39 _081209
74
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ML605 Hardware User Guide
UG534 (v1.8) October 2, 2012