Datasheet

UNISONIC TECHNOLOGIES CO., LTD
SK6908
LINEAR INTEGRATED CIRCUIT
SINGLE-PHASE DC-FAN
MOTOR DRIVER
„
DESCRIPTION
SK6908 is a single-phase driver for dc-fan motors. It provides
high efficiency, low noise output and supports the functions of motor
lock protection, auto restart and rotation detection.
„
FEATURES
*Wide supply voltage range of 2.5V to 20V
*Output current IO(MAX)=600mA
*Operate with Hall element
*Lock protection
*Auto-restart when the motor lock is undone
*FG(frequency generator) output
*Package type SOP-8 and HSOP-8 expose
„
*Pb-free plating product number: SK6908L
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
SK6908-S08-R
SK6908L-S08-R
SK6908-S08-T
SK6908L-S08-T
SK6908-SH2-R
SK6908L-SH2-R
SK6908-SH2-T
SK6908L-SH2-T
Package
Packing
SOP-8
SOP-8
HSOP-8
HSOP-8
Tape Reel
Tube
Tape Reel
Tube
SK6908L-S08-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
www.unisonic.com.tw
Copyright © 2007 Unisonic Technologies Co., Ltd
(1) R: Tape Reel, T: Tube
(2) S08: SOP-8, SH2: HSOP-8
(3) L: Lead Free Plating, Blank: Pb/Sn
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SK6908
„
„
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
OUT2
1
8
GND
FG
2
7
OUT1
CT
3
6
H-
VCC
4
5
H+
BLOCK DIAGRAM
FG output
REGULATOR
Vcc
CONTROL
BLOCK
H+
OUT 1
H-
OUT 2
Hysteresis
Amplifier
CT
LOCK PROTECTION
AUTORESTART
BLOCK
UNISONIC TECHNOLOGIES CO., LTD
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TSD
GND
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„
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta = 25℃)
PARAMETER
SYMBOL
VCC
ICC
IO
IFG
Supply Voltage
Supply Current
Circuit Current
FG Output Current
RATINGS
20
20
600
20
UNIT
V
mA
mA
mA
Power Dissipation
SOP-8
700
mW
PD
(Derate at Ta=25℃ reduce 5.5mW/℃)
HSOP-8
1000
mW
Output Voltage
VOUT
20
V
Hall Input Common Mode Voltage Range
VHIC
1.0 ~ Vcc-0.5
V
Operating Temperature
TOPR
-20 ~ +100(Note1)
℃
Storage Temperature
TSTG
-55 ~ +150
℃
Note 1.For operation in ambient temperatures above 25℃ ,the driver device must be derated based on a 150℃
maximum temperature
Note 2.Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
Note 3.The device is guaranteed to meet performance specification within 0℃~+70℃ operating temperature range
and assured by design from -20℃~+100℃.
„
ELECTRICAL CHARACTERISTICS (Ta=25℃ , VCC=5V)
SYMBO
L
PARAMETER
Current Drain
ICC
Lockup Detection Capacitor Charge Current
Capacitor Discharge Current
Capacitor Charge/Discharge Current Ratio
CT charge Voltage
CT Discharge Voltage
Output Low Level Voltage
Output High Level Voltage
ICT1
ICT2
RCT
VCT1
VCT2
VOL
VOH
Hall Input Sensitivity
VHIN
Hall Input-Output Gain
FG Output Pin Low Voltage
FG Output Pin Leakage Current
GHO
VFG
„
IFG(LEAK)
CONDITIONS
In drive mode (CT=L)
In lockup protection mode (CT=H )
V 1PIN = 1.1V
V 1PIN = 1.1V
IO=200mA
IO=200mA
Zero peak value
(including offset and hysteresis)
MIN TYP MAX UNIT
2
0.3
3.9
3
320
IFG=5mA
VFG=15V
8
4.1
2.8
0.5
5.6
1.9
0.7
0.3
4.1
500
0.3
0
4
0.8
0.7
mA
mA
uA
uA
V
V
V
V
15
mV
680
0.5
10
V
uA
HALL SINGLE INPUT-OUTPUT TRUTH VALUE TABLE
H+
H
L
HL
H
OUT1
H
L
OUT2
L
H
FG
H
L
* CT=0V
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LINEAR INTEGRATED CIRCUIT
LOCKUP PROTECTION / AUTOMATIC RECOVERY
Fig. 1
H+
OUT1
Toff
Ton
VCT1
VCT2
depend on the hall output
FG
motor lock detect lock
Ton (charge time) =
C × (VCT1-VCT2)
ICT1
lock cancel
Toff (charge time) =
release
C × (VCT1-VCT2)
ICT2
C : Value of capcitor at CT terminal
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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SK6908
„
LINEAR INTEGRATED CIRCUIT
POWER DISSIPATION
Fig.-2
The maximum junctions temperature is 150°C in plastic packages, but for reasons of reliability, a lower number may
be mandated.
PT = TJ(MAX) – Ta (MAX) / θJA
PT = Total Power Dissipated by the Device
TJ (MAX) = Maximum Junction Temperature
Ta(MAX) = Maximum Ambient Temperature
θJA = 175°C/W
„
THERMAL SHUTDOWN (TSD)
Fig.-3
OUTPUT OFF
TSD ON
TSD ON ( Typ : 175℃ )
TSD OFF ( Typ : 150℃ )
OUTPUT ON
TSD OFF
150℃
175℃
Junction Temperature (℃)
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LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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