UNISONIC TECHNOLOGIES CO., LTD
SK6908
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.
LINEAR INTEGRATED CIRCUIT
SOP-8
FEATURES
*Wide supply voltage range of 2.5V to 20V
*Output current I
O(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 pan
HSOP-8
*Pb-free plating product number: SK6908L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
SK6908-S08-R
SK6908L-S08-R
SK6908-S08-T
SK6908L-S08-T
SK6908-SM1-R
SK6908L-SM1-R
SK6908-SM1-T
SK6908L-SM1-T
Package
SOP-8
SOP-8
HSOP-8
HSOP-8
Packing
Tape Reel
Tube
Tape Reel
Tube
SK6908L-S08-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) S08: SOP-8, SM1: HSOP-8
(3) L: Lead Free Plating Blank: Pb/Sn
,
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Copyright © 2005 Unisonic Technologies Co., Ltd
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QW-R109-025,A
SK6908
PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
OUT2
1
2
8
7
GND
OUT1
FG
C
T
V
CC
3
4
6
5
H-
H+
BLOCK DIAGRAM
Vcc
REGULATOR
FG output
H+
H-
Hysteresis
Amplifier
CT
CONTROL
BLOCK
OUT 1
OUT 2
LOCK PROTECTION
AUTORESTART
BLOCK
TSD
GND
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QW-R109-025,A
SK6908
ABSOLUTE MAXIMUM RATINGS
(Ta = 25℃)
PARAMETER
Supply voltage
Supply current
Circuit current
FG output current
Power dissipation (Derate at Ta=25
℃
reduce 5.5mW/
℃)
SOP-8
HSOP-8
LINEAR INTEGRATED CIRCUIT
SYMBOL
V
CC
I
CC
I
O
I
FG
RATINGS
20
20
600
20
UNIT
V
mA
mA
mA
P
D
700
mW
P
D
1000
mW
Output Voltage
V
OUT
20
V
Hall input common mode voltage range
V
HIC
1.0 ~ Vcc-0.5
V
Operating ambient temperature
T
OPR
-20 ~ +100(Note1)
℃
Storage temperature
T
STG
-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℃ , V
CC
=5V)
PARAMETER
Current drain
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
Hall input sensitivity
Hall input-output gain
FG output pin low voltage
FG output pin leakage current
SYMBOL
I
CC
I
CT1
I
CT2
R
CT
V
CT1
V
CT2
V
OL
V
OH
V
HIN
G
HO
V
FG
I
FG(LEAK)
CONDITIONS
In drive mode (C
T
=L)
In lockup protection mode (C
T
=H )
V 1PIN = 1.1V
V 1PIN = 1.1V
MIN TYP MAX UNIT
8
mA
4.1
mA
2
2.8
4
uA
0.3 0.5 0.8
uA
5.6
1.9
V
0.7
V
0.3 0.7
V
3.9 4.1
V
3
320
I
FG
=5mA
V
FG
=15V
500
0.3
0
15
680
0.5
10
mV
V
uA
I
O
=200mA
I
O
=200mA
Zero peak value
(including offset and hysteresis)
HALL SINGLE INPUT-OUTPUT TRUTH VALUE TABLE
H+
H
L
* CT=0V
H-
L
H
OUT1
H
L
OUT2
L
H
FG
H
L
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QW-R109-025,A
SK6908
Fig. 1
LINEAR INTEGRATED CIRCUIT
LOCKUP PROTECTION / AUTOMATIC RECOVERY
H+
OUT1
T
off
V
CT1
T
on
V
CT2
depend on the hall output
FG
motor lock detect lock
lock cancel
release
Ton (charge time) =
C
×
(V
CT1
-V
CT2
)
I
CT1
T
off
(charge time) =
C
×
(V
CT1
-V
CT2
)
I
CT2
C : Value of capcitor at CT terminal
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QW-R109-025,A
SK6908
POWER DISSIPATION
Fig.-2
LINEAR INTEGRATED CIRCUIT
mW
1000
800
700
600
400
200
SK6908
Ta(℃)
To use at temperature above Ta =25℃ reduce 5.5mW/℃
The maximum junctions temperature is 150°C in plastic packages, but for reasons of reliability, a lower number may
be mandated.
P
T
= T
J(MAX)
– Ta
(MAX)
/
θ
JA
P
T
= Total Power Dissipated by the Device
T
J (MAX)
= Maximum Junction Temperature
Ta
(MAX)
= Maximum Ambient Temperature
θ
JA
= l75°C/W
25
50
75 85 100
125
150
175
THERMAL SHUTDOWN(TSD)
Fig.-3
OUTPUT OFF
TSD ON
TSD ON ( Typ : 175℃ )
OUTPUT ON
TSD OFF ( Typ : 150℃ )
TSD OFF
150℃
175℃
Junction Temperature (℃)
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QW-R109-025,A
Embedded System
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