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PDF NJM2646 Data sheet ( Hoja de datos )
| Número de pieza | NJM2646 | |
| Descripción | FAN Motor / DMP8 / EMP8 / TVSP8 | |
| Fabricantes | JRC | |
| Logotipo |  |
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NJM2646
Two-phase Unipolar DC Brushless Motor Pre-Driver IC
s GENERAL DESCRIPTION
s PACKAGE OUTLINE
The NJM2646 is a 2-phase DC brushless motor
pre-driver IC.
It incorporates Lock Detect / Auto Protection Circuit and
totem-pole pre-driver for external power MOS-FET.
The turn ON / turn OFF ratio at Auto Protection Release
was set in 1:10 easy-to-use.
Moreover, the pin is compatible with 48V pre-driver
NJM2640.
NJM2646M
NJM2646E
s FEATURES
• Operating Voltage VDD=4 ∼ 15V
• Absolute Maximum Voltage 30V
• Internal Lock Detect / Auto Protection Release Circuit
• Internal Hall Amp with Hysterisis
• Lock Alarm Output Terminal
• Package Outline DMP8(M) / EMP8(E) / TVSP8(RB1)
NJM2646RB1
s BLOCK DIAGLAM
to VCC
1
Vcc
Referrence
Bias
2 H1
H+
-
4 H2
LOGIC
6 Ct
C
GND
5
Lock Detect
Auto Restart
to VCC
OUT1 8
to VCC
OUT2 7
Lock
Alarm
LA 3
s PIN FUNCTION
1
2
3
4
8
7
6
5
1: Vcc
2: H1
3: LA
4: H2
5: GND
6: Ct
7: OUT1
8: OUT2
-1-
1 page  
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NJM2646
s APPLICATION NOTE
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]
V+
GND
D1
C1
R1
Hall
element
R2
H1
H2
Ct
C2
GND
Ra
VCC
CA
Refarence
Bias
+ Logic
-
Lock Detect
Auto Restart
Lock
Alarm
VM
R3
Motor
OUT1
ZD
TR1
ZD
OUT2
TR2
D2
LA
[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:
TON
= C2Vch −Vcl [sec]
Ic
Where C2 is 0.47uF:
TON
= 0.47 ×10−6 ×
2.5 − 0.95
4.0 ×10−6
= 0.18[sec]
-5-
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet NJM2646.PDF ] | |
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