SITI FC122

FC122
Version
: A.002
Issue Date : 2009/07/17
File Name : SP-FC122-A.002.doc
Total Pages: 10
Fan Speed Control IC
新竹市科學園區展業一路 9 號 7 樓之 1
SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Park,
Hsin-Chu, Taiwan 300, R.O.C.
Tel：886-3-5645656
Fax：886-3-5645626
FC122
FC122
Fan Speed Control IC
General Description
The FC122 is a linear fan-speed-control IC designed for power supply. It is a flexible
solution to fan speed control according to the NLX/ATX/PS98 fan speed control
specification.
The FC122 incorporate one linear fan-speed-control input, and one temperature
sensor input for fan-speed-control and monitoring ambient status. Additional output is
provided to report if temperature fault is sensed.
Features
…
…
…
…
…
…
…
Linear fan speed control for high reliable power supply use
NLX/ATX/PS98 fan control compliant
Low power consumption
Adjustable I/O voltage mapping for wide range of application design
Auto-started fan driving for over temperature protection
Fault output provided for easy programming control
Low pin count 8-pin DIP package
Block Diagram
VOUT ≒ [ MAX( ½VDD, VFC, VST ) - ½VDD ] * 6 + VST
1
FC
B
A – ( B – ½VDD )
35 KΩ 210 KΩ
A
OUT
2
TS
6
VOH : VDD
VOL : ½VDD
delay
114 KΩ 126 KΩ
VSTR
VDD
300mS
VST
5
VSTR
FLT
VSTR ≒ ½VDD
7
delay
3
VOT
300mS
Fan Speed Control IC
GND
VDD
4
8
Version：A.002
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PAGE 1
FC122
Pin Description
FC122
VXXYYZZ
Pin No.
1
2
3
4
5
6
7
8
Pin Name
FC
TS
VOT
GND
VST
OUT
FLT
VDD
Signal Type
Analog Input
Analog Input
Analog Input
Ground
Analog Input
Analog Output
Digital Output
Power
Description
Fan speed control input
Sensing voltage from an external thermistor
Reference voltage for over-temperature detection
Ground
Fan start voltage
Output voltage
Open-collector output for over-temperature fault
Supply voltage
Absolute Maximum Ratings (Unless otherwise noted, T
Parameter
Supply Voltage
Input Voltage Range
Output Voltage Range
Junction Temperature
Operating Temperature
Storage Temperature
ESD Susceptibility
Fan Speed Control IC
A
= 25 °C)
Rating
( VDD )
( VI )
( VO )
(TJ )
(Topr )
(Tstg )
( ESD )
- 0. 3 V
- 0. 3 V
0 °C
- 55 °C
< +16.0 V
to VDD + 0.3 V
to VDD + 0.3 V
< 150 °C
to
+ 70 °C
to
+ 150 °C
> 2000 V
Version：A.002
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PAGE 2
FC122
Electrical Characteristics (T = 25°C, V
A
Parameter
Symbol
DD
= 12V)
Conditions
MIN
TYP
MAX
Unit
11.4
12
12.6
2
V
mA
MIN
TYP
MAX
Unit
6.03
50
6.1
100
6.17
150
V
mV
MIN
TYP
MAX
Unit
6.03
250
6.1
300
6.17
350
V
mV
MIN
TYP
MAX
Unit
10.0
V
MAX
Unit
10.0
KΩ
KΩ
V
Power Supply
Supply Voltage
Supply Current
Parameter
VDD
IDD
Symbol
Conditions
Analog Input ( FC )
Start Voltage
Hysteresis
( ≒½VDD )
Parameter
VSTR (FC)
VHYST (FC)
Symbol
Conditions
Analog Input ( TS )
Start Voltage
Hysteresis
( ≒½VDD )
Parameter
VSTR (TS)
VHYST (TS)
Symbol
Conditions
Analog Input ( VOT )
Input Voltage
( < VDD – 2.0V )
Parameter
VVOT
Symbol
6.0
Conditions
MIN
TYP
Analog Input ( VST )
Resistance to VDD
Resistance to VSS
Input Voltage ( < VDD – 2.0V )
RDD
RSS
V ST
126
114
Parameter
Symbol
1.0
Conditions
MIN
TYP
MAX
Unit
240
300
360
5
mS
mA
Analog Output ( OUT )
Start Interval
Source Current
Gain
Parameter
TSTART
IOUT
AOUT
Symbol
VST = 5.7 V
Conditions
6
MIN
TYP
MAX
Unit
240
300
360
0.4
mS
V
Open Collector Digital Outputs ( FLT )
Delay Time
Output Low Voltage
Fan Speed Control IC
TFLT
VOL
IOL = 1 mA
Version：A.002
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PAGE 3
FC122
Functional Description
1. Fan Speed Control:
The output voltage (VOUT) can be controlled by
fan control input (VFC).
VOUT
VDD
VOUT = (VFC – ½VDD ) * AOUT + VST
VFC ≥ VSTR(FC) : VOUT = ( VFC - ½VDD ) * AOUT + VST
VFC
VSTR(FC)
2. Temperature Protection:
Pin-TS connects to an external thermistor
network for monitoring ambient temperature.
The input signal (VTS) will decide the minimum
output voltage (VOUT).
VOUT
VDD
VOUT = (VTS – ½VDD ) * AOUT + VST
VTS ≥ VSTR(TS) : VOUT = ( VTS - ½VDD ) * AOUT + VST
VTS
VSTR(TS)
3. Drive output:
Whenever the fan is started from the off state, it will induce an start-up interval
of 0.3 sec, the Pin-OUT will drive full duty in this period and then continue with
the voltage determined by MAX (VFC, VTS).
4. Fault output:
Pin-FLT is an open collector, and active low signal. It will be pulled to low to
indicate that over-temperature has occurred.
Over-temperature: When VTS exceed VVOT.
Fan Speed Control IC
Version：A.002
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PAGE 4
FC122
Typical Applications
FC
+1 2V
6 .3K Ω
+1 2V
R_ST_ H
10 K Ω
8
VDD
1
FAN C
+5 V
R_FLT
+1 2V
38K Ω
R_OT_L
+1 2V
33K Ω
1%
R_ FC
R_FC_ H
+1 2V
7
FLT
FAU LT
R _TS_H
1 00K Ω
29 K Ω
1%
2
β=40 50
6
OUT
VOT
5
VST
VSS
64K Ω
1%
R_OT_L
64K Ω
1%
R_TS_L
40K Ω
1%
FC122
VFAN
3
R_FC_ L
TS
4
5 .7K Ω
R T_ TS
R _ST_L
+1 2V
2 SD96 5
1 50K Ω
1%
1. Fan speed control:
12.0 V
10.0 V
8.0 V
VFAN
6.0 V
4.0 V
2.0 V
0.0 V
2.0 V
4.0 V
6.0 V
8.0 V
10.0 V
12.0 V
100 °C
120 °C
VFANC
2. Temperature protection:
VFAN
12.0 V
10.0 V
8.0 V
VFAULT
6.0 V
4.0 V
2.0 V
0 °C
20 °C
40 °C
60 °C
80 °C
T
Fan Speed Control IC
Version：A.002
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PAGE 5
FC122
Application Notes
¾ About the pins that are unnecessary in certain cases:
FC122 provides a highly flexible solution to fan speed control. But in some cases
only parts of its functions are needed. When this occurs please refer to the
following table to see what to do with these unnecessary pins.
Pin #
1
2
3
7
Name
FC
TS
VOT
FLT
Description
Fan speed control input
Sensing voltage at thermistor
Reference voltage for Over-temperature detecting
Fault open collector output
Fan Speed Control IC
What to do
Grounding
Grounding
VDD
floating
Version：A.002
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PAGE 6
FC122
Package Specification
( 8-pin DIP )
E1
eB
E
θ°
D
A2
A
Seating Plane
A1
b1
L
b
e
0
5
10
0.0
Symbol
Dimension in mm
Min
Normal
Max
0.5
Dimension in inch
Min
Normal
5.334
A
A1
0.381
A2
3.175
1.0
mm
inch
NOTE
Max
3.302
3.429
0.125
0.13
0.135
0.06
0.018
D
9.017
9.271
10.160
0.355
0.365
0.4
E
7.366
7.620
7.874
0.290
0.300
0.310
E1
6.223
6.376
6.528
0.245
0.251
0.257
e
25
0.210
0.457
b1
20
0.015
1.524
b
15
2.540
0.100
eB
8.509
9.017
9.525
0.335
0.355
0.375
L
2.921
3.302
3.810
0.115
0.13
0.150
θ°
0
7
15
0
7
15
Fan Speed Control IC
Version：A.002
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PAGE 7
FC122
Package Specification (Continued)
( 8-pin SOP )
E
H
0.015 x 45°
D
A2
A
C
A1
Seating Plane
L
0.004
MAX
0
5
0.0
Symbol
θ
e
b
Dimension in mm
Min
Normal
0.2
Dimension in inch
Max
Min
Normal
A
1.346
1.753
0.053
0.069
0.102
0.254
0.004
0.010
A2
1.346
1.499
0.053
0.406
inch
NOTE
0.059
0.008
D
4.801
4.978
0.189
E
3.810
3.988
0.150
1.270
e
0.4
0.016
0.203
c
mm
Max
A1
b
10
0.196
0.157
0.050
H
5.791
6.198
0.228
0.244
L
0.406
1.270
0.016
0.050
θ°
0
8
0
8
Fan Speed Control IC
Version：A.002
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Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
PAGE 8
FC122
The products listed herein are designed for ordinary electronic applications, such
as electrical appliances, audio-visual equipment, communications devices and
so on. Hence, it is advisable that the devices should not be used in medical
instruments, surgical implants, aerospace machinery, nuclear power control
systems, disaster/crime-prevention equipment and the like. Misusing those
products may directly or indirectly endanger human life, or cause injury and
property loss.
Silicon Touch Technology, Inc. will not take any responsibilities regarding the
misusage of the products mentioned above. Anyone who purchases any
products described herein with the above-mentioned intention or with such
misused applications should accept full responsibility and indemnify. Silicon
Touch Technology, Inc. and its distributors and all their officers and employees
shall defend jointly and severally against any and all claims and litigation and all
damages, cost and expenses associated with such intention and manipulation.
Silicon Touch Technology, Inc. reserve the right to make changes to their
products or to discontinue any product or service without notice, and advise
customers to obtain the latest version of relevant information to verify, before
placing orders, that information being relied on is current and complete.
Fan Speed Control IC
Version：A.002
未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
PAGE 9