NJM2640
Two-phase Unipolar DC Brushless Motor Pre-Driver IC
♦
PACKAGE OUTLINE
♦
GENERAL DESCRIPTION
NJM2640 is a two phase unipolar DC brushes motor
pre-driver IC. It features high voltage bipolar technology so
that the driver works up to 48V. High voltage operation
delivers more power and improves power supply
efficiency.Therefore, it is suitable for high voltage fan motor
applications.
NJM2640E
♦
FEATURES
•
Operating Supply Voltage V
CC
=4 to 55V
•
Absolute Maximum Voltage 60V
•
Internal Lock Protection /Auto Protection Release
Circuit
•
Lock Alarm Output Terminal
•
Package Outline EMP8
♦
BLOCK DIAGRAM
♦
PIN CONFIGURATIONS
1
2
3
4
1 : Vcc
2 : H1
3 : LA
4 : H2
5 : GND
6 : Ct
7 : OUT1
8 : OUT2
8
7
6
5
Ver 3.2
- 1 -
NJM2640
♦
ABSOLUTE MAXIMUM RATINGS(Ta=25°C)
PARAMETER
SYMBOL
Vcc
V
IH
I
OUT
V
OLA
V
IHD
I
OLA
P
D
Topr
Toj
Tstg
RATINGS
60
-0.3∼Vcc
30
60
2
20
375
-20∼85
-40∼150
-55∼150
UNIT
V
V
mA
V
V
mA
mW
°C
°C
°C
Supply Voltage
Hall Input Voltage Range
Output Current
Lock Alarm Output Voltage
Hall Input Differential Voltage
Lock Alarm Output Current
Power Dissipation
Operating Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
♦
ELECTRICAL CHARACTERISTICS(Vcc=48V, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITIONS
Operating Supply Voltage
Vcc
-
Range
NIN..
4.0
-
-
8
-
1.5
-
-
-
-
-
-
4.0
2.2
0.6
-
-
TYP.
48.0
3.0
3.8
20
0.5
-
Vcc-1.5
-
-
-
3.8
0.75
5.5
2.5
0.7
0.25
1.25
MAX.
55.0
4.0
4.8
32
1.0
Vcc-2
-
5
0.5
10
-
-
8.0
2.8
0.8
-
-
UNIT
V
mA
mA
mV
µA
V
V
µA
V
µA
µA
µA
Operating Current
Hall Input Hysterisis Range
Hall Amplifier Input Bias
Current
Hall Input Common mode
Voltage
Output Voltage
Output Leak Current
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
OFF Time
Icc
V
HYS
I
B
V
ICM
V
OUT
I
LEAK
V
LA
I
LA-LEAK
I
CHG
I
DCHG
I
CHG
/ I
DCHG
V
CtH
V
CtL
T
ON
T
OFF
Vcc=24V
Vcc=48V
-
-
-
I
OUT
=10mA
Vcc=60V
Lock Alarm ON, I
LA
=5mA
V
LA
=60V
V
Ct
=1.5V
V
Ct
=1.5V
-
-
-
Ct=0.47µF
Ct=0.47µF
V
V
s
s
-2-
NJM2640
♦
TYPICAL CHARACTERISTICS
ICC VS. VCC
4.0
3.5
3.0
ICC[mA]
2.5
2.0
1.5
1.0
0.5
0.0
0
10
20
30
VCC[V]
40
50
60
Lock Alarm Output Voltage
VS. Lock Alarm Output Current
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
2
VCC=48V
VCC=24V
VLA[V]
4
6
8
10
12
14
16
18
ILA[mA]
Output Voltage
VS. Output Current
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
5
Vsat(VCC-Vout)[V]
VCC=48V
VCC=24V
10
15
Output Current[mA]
20
25
30
-3-
NJM2640
♦NJM2640
application note
The NJM2640 is a two-phase motor unipolar pre-driver IC featuring 60V operating high voltage process
technology.
It is suitable for fan motor drivers for communication equipment where 48V operation is required.
[Application Circuit Example]
V+
D1
C1
GND
Motor
Ca
R1
VCC
Hall
element
H1
H2
ZD1
R2
Ct
C2
GND
OUT2
TR2
ZD2
R4
R5
LA
Lock alarm out
D2
OUT1
R5
R4
R3
ZD1
TR1
ZD2
Ra
NJM2640
[Design Notes]
Above application example is designed for 48V operation with motor current of 300mA. It uses the following
components:
Hall Elements: HW101A (AKD)
TR1,TR2: 2SD0968A (NEC)
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).
-4-
NJM2640
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 .7
=
0.22
[
sec
]
3.8
×
10
−
6
Auto Resume Time (Toff) is given by:
T
OFF
=
C
2
Vch
−
Vcl
[
sec
]
Idc
Where C2 is 0.47uF:
T
OFF
=
0.47
×
10
−
6
×
2.5
−
0.7
=
1.13
[
sec
]
0.75
×
10
−
6
In actual application, Lock detection time (Ton) is affected by the mechanical time constant of a motor.
Therefore, constant start up must be confirmed in actual evaluation taking operating variations
(i.e.Temperature, Voltage change and so on) in consideration.
A typical value of C2 is either 0.47uF or 1uF depending on a motor.
Hall input
Motor output
t
on
t
OFF
Ct Teminal voltage
High
LATeminal voltage
Motor Lock protection period
Motor Locked
Returns to normal operation
Lock Protection
Lock Alert Out (LA: Pin 3) is a open collector output and R3 is a pull up resister. A typical value of R3 is
10kΩ.
It must be noted that Lock Alert Out stays a H state during few hundred milliseconds from power up as
shown in the picture below.
Power supply
LA terminal output
Hundreds of millimeter second
-5-
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
