NJM2644RB1-TE1 NJR, NJM2644RB1-TE1 Datasheet - Page 5

• Manufacturer Part Number: NJM2644RB1-TE1
• Description: Motor / Motion / Ignition Controllers & Drivers 2-Phase DC Brushless Motor Pre-driver IC
• Manufacturer: NJR

Specifications of NJM2644RB1-TE1

• Mounting Style: SMD/SMT
• Package / Case: TVSP-8
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

constant start up must be confirmed in actual evaluation taking operating variations (i.e. Temperature, Voltage change
and so on) in consideration.
Where C2 is 0.47uF:
Auto Resume Time (Toff) is given by:
Where C2 is 0.47uF:
In actual application, Lock detection time (Ton) is affected by the mechanical time constant of a motor. Therefore,
A typical value of C2 is either 0.47uF or 1uF depending on a motor.
Therefore the same value of hall bias resistors is selected for R1 and R2.
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.
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 .
Non-excitation hall bias voltage is to be set at a half of VCC for effective use of common-mode input voltage range.
T
T
OFF
OFF
T
ON
OUT1
OUT2
C
. 0
H1
H2
CT
. 0
2
47
Vch
47
Idc
10
10
Vcl
6
Motor Locked
6
sec
0
2
4
2
4 .
5 .
0 .
8 .
10
10
0
0
7 .
7 .
6
6
Toff
. 2
. 0
Motor Lock protection period
47
25
sec
sec
Ton
Returns to normal operation
Toff
NJM2644
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