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PDF NJM2644 Data sheet ( Hoja de datos )
| Número de pieza | NJM2644 | |
| Descripción | FAN Motor / DMP8 / TVSP8 | |
| Fabricantes | JRC | |
| Logotipo |  |
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NJM2644
Two-phase Unipolar DC Brushless Motor Pre-Driver IC
s GENERAL DESCRIPTION
s PACKAGE OUTLINE
The NJM2644 is a 2-phase DC brushless motor
pre-driver IC.
It incorporates Lock Detect and Auto Protection circuit for safety
operation. Especially, 1:10 ON/OFF duty ratio while motor is locked
reduces heat generation in motor windings.
Moreover, the pin is compatible with 12V LA output
two-phase pre-driver NJM2641.
NJM2644M NJM2644RB1
It is suitablefor 12Vfanmotor applications.
s FEATURES
• Operating Voltage VDD=4 to 14V
• Absolute Maximum Voltage 15V
• Internal Lock Detect / Auto Protection Release Circuit
• FG Output Terminal
• Package Outline DMP8 / TVSP8
s BLOCK DIAGLAM
s PIN FUNCTION
1
2
3
4
8
7
6
5
1: Vcc
2: H1
3: FG
4: H2
FG 5: GND
6: Ct
7: OUT1
8: OUT2
-1-
1 page  
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NJM2644
Where C2 is 0.47uF:
TON
= 0.47 ×10−6 ×
2.8 − 0.7
4.0 ×10−6
=
0.25[sec]
Auto Resume Time (Toff) is given by:
TOFF
=
C2Vch −Vcl
Idc
[sec]
Where C2 is 0.47uF:
TOFF
=
0.47
× 10−6
×
2.5 − 0.7
0.4 ×10−6
= 2.47[sec]
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.
Motor Locked
H1
H2
Returns to normal operation
OUT1
OUT2
CT
Toff Ton Toff
Motor Lock protection period
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.
3. Design of hall element bias resistance (R1 and R2)
Hall amplifier is a differential amplifier with hysteresis characteristics (24mV typical).
The common-mode input voltage is between 1.5V and Vcc-2V and the input signal must be within the range.
Non-excitation hall bias voltage is to be set at a half of VCC for effective use of common-mode input voltage range.
Therefore the same value of hall bias resistors is selected for R1 and R2.
-5-
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet NJM2644.PDF ] | |
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