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PDF TDA21801 Data sheet ( Hoja de datos )
| Número de pieza | TDA21801 | |
| Descripción | Low Cost Fan Speed Controller | |
| Fabricantes | Infineon Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TDA21801 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Version 2.11, May 2005
Datasheet
DS-FanControl-TDA21801
www.DataSheet4U.com
TDA21801
Authors:
E. Chang 1)
G. Bernacchia 2)
N. Florio 2)
R. Pittassi 2)
G. Capodivacca 2)
Published by Infineon Technologies AG
http://www.infineon.com/dcdc
1) Villach, Infineon Technologies Austria AG
2) Padova, Infineon Technologies Italia S.r.l.
Power Management & Drive
FanControl
N e v e r s t o p t h i n k i n g.
Page 1 of 30
DS-FanControl-TDA21801
1 page  
4. General Description
The Fan Speed Controller is a fully integrated control with few external components to set up a flexible
and low cost application. The device uses the waveform of the current in a standard two-wire fan to
detect the speed of revolution and to control it.
The current flowing through the fan is sensed by the shunt resistor connected to RSin. For fans with a
supply current between 50mA and 400mA, a good value for this resistor is between 0.5 and 1Ω as the
maximum input voltage of RSin for linear operation is 330mV.
The Pulse Detector circuit creates one internal trigger pulse at every commutation of the fan motor. The
internal trigger pulse will be processed if the current waveform through the motor shows appropriate
variations at the commutation.
www.DataSheet4U.com Monitoring and warning signal can be used to check the working condition.
Every two internal trigger pulses one is fed to the FanM output to monitor the speed of rotation.
The device controls the speed of revolution. The temperature is measured with the NTC thermistor and
according to the voltage on the NTC the speed of the fan is set.
In Fig.1 the dependence of the fan speed with the temperature is shown (supposing a minimum speed
of 1329 rpm).
The expression of the minimum VCO frequency @ minimum FAN Speed is given by:
fvco
=
16
15
*
n
*
P
n = Fan speed in rpm.
P =number of pole (Fans in use for desktop PC SMPS are normally 4 poles).
FanControl
Page 5 of 30
DS-FanControl-TDA21801
5 Page 
6 Application Information
6.1 Filter and Amplifier parameters
The Fan current is measured by a shunt resistor RRSin and connected to the RSin pin. This is the input
signal to the pre-amplifier with a typical gain of 15 and a typical cut off frequency of 20k Hz and –6 dB/
octave.
Only an input signal between 40mV and 330mV will be properly detected and processed otherwise the
recognition of the pulse cannot be guaranteed.
The value of the shunt resistor RRSin has to be chosen according to the current of the fan. For example
with spike current of 400mA a shunt resistor of typically 0.68Ω should be used.
www.DataSheet4U.com
At typical operating condition.
Parameter
Symbol
Conditions
Values
UNIT
Min. Typ. Max.
Gain
Cutoff frequency
RSin pin source current
GRSin
FFA
IRsin
Verified by Design
14.7 15 15.3
Verified by Design
VRSin= 100m V
20 kHz
0 4 uA
R3
14R
VRSin
R
Ib
V-
+
_
I2
R1
I1
14R
R
VREF
Rf
VOUT‘
R2
Fig. 3 Analog front end Block Diagram
+
_
D
VOUT
C
FanControl
Page 11 of 30
DS-FanControl-TDA21801
11 Page | ||
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| PDF Descargar | [ Datasheet TDA21801.PDF ] | |
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