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PDF NJM2640 Data sheet ( Hoja de datos )

Número de pieza NJM2640
Descripción FAN Motor / EMP8
Fabricantes JRC 
Logotipo JRC Logotipo



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No Preview Available ! NJM2640 Hoja de datos, Descripción, Manual

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NJM2640
Two-phase Unipolar DC Brushless Motor Pre-Driver IC
GENERAL DESCRIPTION
PACKAGE OUTLINE
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.
FEATURES
Operating Supply Voltage VCC=4 to 55V
Absolute Maximum Voltage 60V
Internal Lock Protection /Auto Protection Release
Circuit
Lock Alarm Output Terminal
Package Outline EMP8
NJM2640E
BLOCK DIAGRAM
PIN CONFIGURATIONS
18
27
36
45
1 : Vcc
2 : H1
3 : LA
4 : H2
5 : GND
6 : Ct
7 : OUT1
8 : OUT2
Ver 3.2 - 1 -

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NJM2640 pdf
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Lock detection time (Ton) is given by:
TON
= C2Vch Vcl [sec]
Ic
Where C2 is 0.47uF:
TON
=
0.47
×10
6
×
2.5 0.7
3.8 ×10 6
= 0.22[sec]
NJM2640
Auto Resume Time (Toff) is given by:
TOFF
=
C2Vch Vcl
Idc
[sec]
Where C2 is 0.47uF:
TOFF
=
0.47
×106
×
2.5
0.75
0.7
× 10 6
= 1.13[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.
Hall input
Motor output
ton tOFF
Ct Teminal voltage
LATeminal voltage
High
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
10k.
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-

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