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NJM3517D2

P1-P3P4-P6P7-P9P10-P12
NJM3517
< About the turn-off circuit >
There are various turn-off circuit methods for the purpose of extracting the speed performance of the motor.
The turn-off time of motor current depends on the clamp voltage of the turn-off circuit.
Therefore, it is necessary to select an appropriate turn-off method according to the motor speed.
However, the larger the clamp voltage of the turn-off circuit, the negative voltage is generated by
electromagnetic induction to the other winding.
< Prevention of Malfunction for Negative Voltage >
In unipolar motor drive, when switching the winding current electromagnetically coupled, the output pin may
become below the GND potential due to long wiring of the motor, routing of the GND wiring of the mounting
board, turn-off circuit type, and so on.
Due to the nature of the monolithically structured IC, when a large negative voltage is applied to the output pin,
the inside of the IC may cause unexpected operation, which may cause circuit malfunction (miss step).
Therefore, in order to reliably prevent circuit malfunction due to negative voltage, it is recommended to insert a
diode in series at the output pin and take countermeasures.
VMM
+
*Series insertion diode
for negative voltage prevention
Turn-off Circuit
Method Diode Turn-off Resistor + Diode Turn-off Zener Diode + Diode Turn-off
External parts scale Small Medium Large
Motor Speed Low
Negative voltage value Low
High
Middle to High
i
VMM
Diode Turn-off Circuit
V
CLAMP
=V
F
V
R
VMM
Resistor + Diode Turn-off Circuit
V
CLAMP
=V
F
+V
R
i
V
Z
i
VMM
Zener Diode + Diode Turn-off Circuit
V
CLAMP
=V
F
+V
Z
NJM3517
■ TYPICAL CHARACTERISTICS
Figure 13. Power dissipation vs. Ambient
temrature.
Figure 12. Typical second output
saturation voltage vs. output current
Figure 14. Typical phase output satura-
tion voltage vs. output current
2.5
2.0
1.5
1.0
0,5
0
0 0.1 0.2 0.50.40.3
V
LCE
sat [V]
I
L
[A]
T
A
= +25° C
2.5
2.0
1.5
1.0
0,5
0
0 50 100 150
Allowable power dissipation [W]
Ambient tem
rature [°C]
Figure 15. Typical I
Ø
vs. V
ØCE Sat
. “Zero
output” saturation
Figure 16. Typical t
On
vs. C
T
/R
T
. Output
pulse width vs. capacitance/resistance
Figure 18. Typical P
DP
vs. I
P
. Power
dissipation without second-level supply
(includes 2 active outputs = FULL STEP)
Figure 20 . Motor Current IP
1
10
-1
10
-6
0.01 0.1 1 100010010
Output Pulse Width [s]
Ct Capacitance [nF]
10
-2
10
-3
10
-4
10
-5
T
A
= +25° C
Rt = 10M
Rt = 100k
Rt = 10k
Rt = 1k
1
10
-1
10
-6
0.001 0.01 0.1 100101
Output Pulse Width [s]
fs Step frequency [kHz]
10
-2
10
-3
10
-4
10
-5
T
A
= +25° C
50%
25%
Dutycy
c
le
100%
0.1%
1%
10%
-0.5
-0.4
-0.3
-0.2
-0.1
0
0 0.2 0.4 1.00.80.6
Output Current [A]
Power Dissipation [W]
T
A
= +25° C
(Ip = 0)
10% 50% 100%
350
Motor Current [mA]
t
ON
Time
Normal
Bilevel
Bilevel without
time limit
T
A
= +25° C
10
8
6
4
2
0
0 0.2 0.4 1.00.80.6
Output Current [mA]
Output Voltage [V]
0.5
0.4
0.3
0.2
0.1
0
0 0.2 0.4 1.00.80.6
Output Current [A]
Power Dissipation [W]
T
A
= +25° C
(IL= 0)
Figure 19. Typical P
DL
vs. I
L
. Power
dissipation in the bilevel pulse when
raising to the I
L
value. One active output
Figure 17.Typical t
on
vs. f
s
/dc. Output
pulse width vs.step frequency/duty
NJM3517
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
P1-P3P4-P6P7-P9P10-P12

NJM3517D2

Mfr. #:
Buy NJM3517D2
Manufacturer:
NJR (New Japan Radio)
Description:
Motor / Motion / Ignition Controllers & Drivers Stepper
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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