NJM2646
Two-phase Unipolar DC Brushless Motor Pre-Driver IC
GENERAL DESCRIPTION
The NJM2646 is a 2-phase DC brushless motor pre-driver
IC with a totem-pole pre-driver for external power MOS-FET
driving. It has useful functions of Lock Detect and Auto
Protection circuit, which improve safety in motor locking. The
turn-on/turn-off ratio in the auto-recovery period is set in 1:10.
The NJM2644 is available in surface mount packages, an
8-lead DMP, SOP and thin type MSOP (TVSP), which
provides downsizing in the 12V fan motor applications. And it
is pin compatible with the NJM2640, 48V pre-driver.
PACKAGE OUTLINE
NJM2646M
( DMP8 )
NJM2646E
( SOP8 )
FEATURES
•
Operating Voltage V
DD
=4 to 15V
•
Absolute Maximum Voltage 30V
•
Internal Lock Detect / Auto Protection Release Circuit
•
Internal Hall Amp with Hysterisis
•
Lock Alarm Output Terminal
•
Package Outline DMP8,
SOP8 JEDEC 150mil
MSOP8(TVSP8)*
*MEET JEDEC MO-187-DA / THIN TYPE
NJM2646RB1
( MSOP8(TVSP8 ))
BLOCK DIAGRLAM
to VCC
PIN FUNCTION
1
Vcc
1
2
to VCC
8
7
6
5
1: Vcc
2: H1
3: LA
4: H2
5: GND
6: Ct
7: OUT1
8: OUT2
Referrence
Bias
2
H
4
H1
H2
OUT1 8
+
-
LOGIC
3
4
to VCC
6
Ct
Lock Detect
Auto Restart
OUT2
7
C
GND
5
Lock
Alarm
LA
3
-1-
NJM2646
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Hall Input Voltage Range
Output Current (Peak)
Lock Alarm Output Voltage
Hall Input Differential Voltage
Lock Alarm Output Current
Operating Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Power Dissipation
SYMBOL
V
cc
V
IH
I
O UT
V
OLA
V
IHD
I
OLA
Topr
Toj
Tstg
P
D
RATINGS
30
-0.3 to V
CC
70
30
2
20
-40 to 85
-40 to 150
-50 to 150
300 (DMP8)
300 (SOP8)
400 (MSOP8(TVSP8))
(Ta=25°C)
UNIT
NOTE
V
V
mA
V
V
V
°C
°C
°C
mW
-
-
-
-
-
-
-
-
-
Device
itself
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
Supply Voltage
Hall Input Voltage Common Mode Voltage
Junction Temperature
V
cc
V
ICM
Tj
RATINGS
4 to 15
1.5 to Vcc-2
-40 to 125
(Ta=25°C)
UNIT (unit)
NOTE
V
V
°C
-
-
-
-2-
NJM2646
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
Operating Current
Hall Input Hysterisis
Range
Hall Amplifier Input Bias
Current
High Side Output
Voltage
Low Side Output
Voltage
Output Clamp Voltage
Lock Alarm Output
Voltage
Lock Alarm Leak
Current
Ct Charge Current
Ct Discharge Current
Charge / Discharge
Current Ratio
Ct H-level Cense
Voltage
Ct L-level Cense
Voltage
Auto Protection
Release ON Time
Auto Protection
Release ON Time
Icc
V
HYS
I
B
V
OH
V
OL
V
CLM
V
LA
I
LA-LEAK
I
C
I
DC
I
C
/ I
DC
V
CH
V
CL
T
ON
T
OFF
-
Ct=0.47µF
Ct=0.47µF
CONDITION
-
-
-
I
OUT
=20mA
I
OUT
=20mA
V
CC
=28V
Lock Alarm ON,I
LA
=5mA
V
LA
=15V
V
Ct
=1.5V
V
Ct
=1.5V
-
MIN.
-
8
-
10.0
-
-
-
-
-
-
-
2.2
0.85
-
-
(V
DD
=12V, Ta=25°C)
TYP.
MAX.
UNIT
7.7
20
0.5
10.3
0.5
15
-
1
4.0
0.4
12
2.5
0.95
0.23
2.8
10.5
-
-
-
0.8
-
0.5
3
5.5
0.6
-
2.8
1.05
-
-
V
V
s
s
mA
mV
µA
V
V
V
V
µA
µA
µA
-3-
NJM2646
TYPICAL CHARACTERISTICS
VCC vs ICC
VCC vs VCLM
10
8
7
ICC[mA]
6
VCLM[V]
0
5
10
15
VCC[V]
20
25
30
5
3
4
2
1
0
2
4
6
8
10
12
14
16
9
0
5
10
15
VCC[V]
20
25
30
IOUT vs VOH
0
IOUT vs VOL
12
11
VOH1[V]
10
VOL1[V]
9
7
8
6
0.
5
0
1.
0
1.
5
2.
0
0
10
20
30
40
IOUT[m A]
50
60
70
80
0.
0
10
20
30
40
50
IOUT[m A]
60
70
80
90
100
5
Ta vs Toff/Ton
20
VLA
1.
0
18
16
14
Toff/Ton[sec]
12
VLA[V]
10
8
6
4
Ta[
℃
]
0.
0
-50
-25
0
25
50
75
100
125
150
-50
-25
0.
1
2
0.
2
0.
3
0.
4
0.
5
0.
6
0.
7
0.
8
0.
9
0
25
50
Ta[
℃
]
75
100
125
150
APPLICATION NOTE
-4-
0
NJM2646
The NJM2646 is a two-phase motor unipolar pre-driver IC for FET drive. It is suitable for fan motor drivers for
communication equipment where 12V operation is required.
[Application Circuit Example]
D1
V+
C1
GND
Ra
VCC
CA
VM
R3
R1
Refarence
Bias
Motor
Hall
element
H1
H2
+
-
Logic
OUT1
TR1
ZD
ZD
R2
Ct
Lock Detect
Auto Restart
OUT2
TR2
C2
GND
Lock
Alarm
LA
D2
[Design Notes]
Above application example is designed for 12V operation. It uses the following components:
Hall Elements: HW101A (AKE)
TR1,TR2: 2SK3022 (Panasonic)
1. Selection of C1 and D1:
C1 is used for a noise reduction purpose. A typical value is 0.1uF.
Optimize the value in actual operating conditions if necessary. D1 is a diode for protection against reverse voltage
supply. Silicon rectifier diode (WO3C, 10D1 and equivalent) is appropriate.
2. Lock Protection Function (Design of C2 value):
Lock Protection Function, consists of Motor Lock Detection and Auto Resume Function, is a safety feature to protect
a motor and a driver circuit from fatal destruction in case of motor halt.
Motor Lock Detection detects motor halt due to irregular load conditions and then cuts motor driving current f or
safety operation. When Lock Detection is activated; Lock Alert Out (LA: Pin 3) goes to L.
A value of C2 determines Lock detection time (Ton) and Auto Resume Time (Toff).
Lock detection time (Ton) is given by:
T
ON
=
C
2
Vch
−
Vcl
[
sec
]
Ic
Where C2 is 0.47uF:
T
ON
=
0.47
×
10
−
6
×
2.5
−
0.95
=
0.18
[
sec
]
4.0
×
10
−
6
Auto Resume Time (Toff) is given by:
-5-
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