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FSCT17A-UH5 Datasheet

FAN SPEED CONTROLER

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®
A.S.D.TM
Application Specific Discretes
FSCTxxA-UH5
FAN SPEED CONTROLER
APPLICATIONS
s COMPUTER AND SERVER POWER SUPPLY
s TELECOM
s LOW COST VENTILATION (consumer)
FEATURES
s Built in thermal sensor
s Brushless DC fan speed control
s Linear control and regulation of the fan speed
according to the temperature
s Green OFF mode operation with automatic
turn- ON in case of overtemperature
s Voltage limitation above fan stall voltage
s No external NTC required
BENEFITS
s Low cost integrated fan speed control
s High integration: only one or two external com-
ponents
s Reduced acoustic noise because of the linear
control of the external transistor
s Power supply noise rejection
s Good thermal coupling with heater
s Reduced ON/OFF oscillation because of large
hysteresis
s High current capability (base current higher
than 10 mA)
s Higher accuracy than discrete circuit with NTC
1
IPPAK
5
Fig. 1: Block Diagram.
FSCTxxA-UH5
ON
VCC
VOLTAGE
REF.
TEMP.
SENSOR
ON/OFF
LOW
ON/OFF
HIGH
HYSTERESIS
COMPARATOR
ON
REGULATION
HYST.-EN
VT
DRIVER
BIAS
F
OUT
COUT=
100nF
GND
GENERAL DESCRIPTION
The FSCTxxA-UH5 is a high-integrated low cost fan speed controller suitable for PC desktops, notebooks
and server power supplies and also all kind of equipments where low cost ventilation system is needed. An
internal thermal sensor connected to the tab is used to regulate the fan speed. A continuous analog voltage
proportional to the tab temperature is produced at the OUT terminal and can control linearly an external
PNP transistor (Fan Transistor) connected in series with a Brushless DC Fan, in order to vary its speed.
The ON control terminal can be used to select two operation modes. If not connected (high impedance
state) ON mode is selected by default.
In Mode ON, the fan speed is regulated according to the tab temperature of the FSCT by adjusting the Vbe
voltage of the PNP fan Transistor. In low temperature conditions, the fan transistor voltage is limited to
about 5.5V (for a 12V fan) in order to guarantee a minimum voltage across the fan above its stalling voltage
and to keep it running (see figure 3).
This regulation is implemented with a high Fan supply voltage rejection.
www.DatTaShheeemt4oUd.ecoOmFF allows to operate in green Mode. The fan is stopped as long as the temperature remains
below the TON threshold. When the temperature rises above TON the fan is forced to ON and the speed is
regulated according to the temperature as in the same way as mode ON. When temperature falls below
TOFF, the fan is automatically turned OFF. The hysteresis has been dimensioned large enough to reduce
ON/OFF oscillations during the green mode operation.
September 2003 - Ed: 2A
1/11


STMicroelectronics Electronic Components Datasheet

FSCT17A-UH5 Datasheet

FAN SPEED CONTROLER

No Preview Available !

FSCTxxA-UH5
PINT OUT DESIGNATION
Pint Out
designation
TEST
VCC
GND
ON
OUT
Description
Test pin (must not be connected)
Operating DC supply
Ground (internally connected to the tab)
Mode ON and OFF selection
Output (connect to PNP fan transistor base)
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
VCC Supply voltage referenced to GND
Tj Operating junction temperature
Tstg Storage temperature
TL Lead temperature (double wave soldering)
Maximum voltage at any pin
Minimum voltage at any pin
ESD
Electrostatic discharge immunity at each terminal
(human body model)
Pin
1
2
3
4
5
Value
-0.3 to 20
0 to 125
-65 to 150
260
VCC
-0.3
2
Unit
V
°C
°C
°C
V
V
kV
ELECTRICAL CHARACTERISTICS (Continue)
VCC from 9Vdc to 15Vdc, Cout = 100nF, Tj = 0°C to 125°C, otherwise specified
Symbol
Parameter
Test conditions
SUPPLY
ICCmax Operating supply current VON = 5V or 0V
VCC = 12V
DRIVER
IOL Sinking current capability VOUT = VOL and Tj = 125°C
at the OUT terminal
ILEAK
Maximum sink leakage VOUT = 20V, VON = 0V
current at OUT pin (mode Tj = 50°C
OFF)
VOL Minimum voltage at the VON = 5V, Tj = 125°C
OUT terminal (mode ON)
VOMS
OUT voltage for mini-
mum fan speed (mode
ON)
VON = 5V, Tj from 0°C to TMS
Static line regulation
VCC = 9V to 15V, VON = 5V
Tj = 25°C
KSL VOUT temperature slope
www.DataSheet4U.com
VOUT = 80% FSCT17A-UH5
VOMS to
20% VOMS
FSCT11A-UH5
FSCT07A-UH5
Min.
10
155
100
68
Value
Typ.
1.1
0.55
5.3
0.5
165
107
72
Unit
Max.
3 mA
mA
10 µA
0.7 V
5.5 V
mV/V
175 mV/°C
114
77
2/11


Part Number FSCT17A-UH5
Description FAN SPEED CONTROLER
Maker STMicroelectronics
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