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EVAL-ADM1026EB Datasheet(PDF) 23 Page - Analog Devices

Part # EVAL-ADM1026EB
Description  Complete Thermal and System Management Controller
PDF  56 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

EVAL-ADM1026EB Datasheet(HTML) 23 Page - Analog Devices

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ADM1026
Rev. A | Page 23 of 56
•
In all these circuits, the output transistor must have an
ICMAX greater than the maximum fan current, and be
capable of dissipating power due to the voltage dropped
across it when the fan is not operating at full speed.
•
If the fan motor produces a large back EMF when switched
off, it may be necessary to add clamp diodes to protect the
output transistors in the event that the output goes from
full scale to zero very quickly.
Q1
2N2219A
DAC
R1
10k
Ω
1/4
LM324
R2
36k
Ω
12V
Figure 36. Fan Drive Circuit with Op Amp and Emitter-Follower
Q1
BD136
2SA968
DAC
R1
10k
Ω
1/4
LM324
R2
39k
Ω
R4
1k
Ω
R3
1k
Ω
12V
Figure 37. Fan Drive Circuit with Op Amp and PNP Transistor
Q1
IRF9620
DAC
12V
R1
10k
Ω
1/4
LM324
R2
39k
Ω
R3
100k
Ω
Figure 38. Fan Drive Circuit with Op Amp and P-Channel MOSFET
R2
100k
Ω
Q1/Q2
MBT3904
DUAL
12V
DAC
R3
39k
Ω
R4
10k
Ω
Q3
IRF9620
R2
100k
Ω
Figure 39. Discrete Fan Drive Circuit with P-Channel MOSFET, Single Supply
R2
100k
Ω
Q1/Q2
MBT3904
DUAL
+12V
DAC
R3
39k
Ω
R4
10k
Ω
R1
4.7k
Ω
–12V
Q3
IRF9620
Figure 40. Discrete Fan Drive Circuit with P-Channel MOSFET, Dual Supply
PWM Output
Fan speed may also be controlled using pulse width modulation
(PWM). The PWM output (Pin 18) produces a pulsed output
with a frequency of approximately 75 Hz and a duty cycle
defined by the contents of the PWM control register (Address
05h). During automatic fan speed control, described below, the
four MSBs of this register set the minimum fan speed.
The open drain PWM output must be amplified and buffered
to drive the fans. The PWM output is intended to be used with
an NMOS driver, but may be inverted by setting Bit 1 of Test
Register 1 (Address 14h) if using PMOS drivers. Figure 41
shows how a fan may be driven under PWM control using an
N-channel MOSFET.
+V
Q1
NDT3055L
PWM
3.3V
10k
Ω TYP
5V OR 12V
FAN
Figure 41. PWM Fan Drive Circuit Using an N-Channel MOSFET



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