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BD63731EFV Datasheet(Fiches technique) 4 Page - Rohm

Numéro de pièce BD63731EFV
Description  36 V High-performance, High-reliability Withstand Voltage Stepping Motor Driver
Télécharger  31 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BD63731EFV Datasheet(HTML) 4 Page - Rohm

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BD63731EFV
TSZ02201-0P1P0C702140-1-2
© 2019 ROHM Co., Ltd. All rights reserved.
21.Jun.2019 Rev.001
www.rohm.com
TSZ22111
• 15 • 001
Function Explanation - continued
6
VCCX
(Note 1)/Power supply pin
Motor’s drive current is flowing in this pin, design the wire in such a way that it is thick enough, as short as possible
and has low impedance. VCC voltage may have large fluctuations due to counter electromotive force of the motor,
PWM switching noise etc.
, so arrange the bypass capacitors to 100 μF to 470 μF, as close as possible to the pin and
adjust in such a way the VCC voltage is stable. Increase the capacitor if needed specially when a large current is used
or those motors that have large electromotive force are used. In addition, we recommend placing a multilayer ceramic
capacitor of 0.01 μF to 0.1 μF in parallel for the purpose of lowering the impedance of the power supply in a wide
frequency band. Extreme care should be observed to make sure that the VCC voltage does not exceed the rating even
for a short period of time only. VCCX is shorted inside the IC, so make sure to short VCCX externally. If it is used
without shorting, malfunction or destruction may occur because of concentration of current routes, so make sure to
short it. In addition, the power supply in has a built-in clamp element for preventing electrostatic damage. If a steep
pulse signal or voltage, such as a surge exceeding the absolute maximum rating, is applied, the clamping element
may operate and be destroyed, so do not exceed the absolute maximum rating. It is also effective to attach a Zener
diode of the absolute maximum rating. In addition, the diode for preventing electrostatic damage is inserted between
the VCCX pin and the GND pin, as a result there is a danger that IC will destroyed if a reverse voltage is applied, so be
careful.
(Note 1) x=1 or 2
7
GND/Ground pin
In order to reduce the noise caused by switching current and stabilized the internal reference voltage of IC, wire in
such a way that the wiring impedance from this pin made as low as possible to achieve the lowest electrical potential in
any operating conditions. Design the pattern so that it does not have a common impedance with other GND patterns.
8
OUT1A, OUT1B, OUT2A, OUT2B/H bridge output pin
Motor’s drive current is flowing in this pin, design the wire in such a way that it is thick enough, as short as possible
and has low impedance. It is also effective to add a Schottky diode when the output has large positive and negative
fluctuations when large current is used, for example when the back electromotive voltage is large. In addition, the
output pin has a built-in clamp element for preventing electrostatic damage. If a steep pulse signal or voltage, such as
a surge exceeding the absolute maximum rating, is applied, the clamping element may operate and be destroyed, so
do not exceed the absolute maximum rating.
9
RNFX
(Note 2)/Connection pin of resistor for detecting of output current
Insert current detecting
resistor of 0.1 Ω to 0.2 Ω between RNFX and GND.
The power consumption of current detecting resistor (W) can be calculated by the motor output current value (IOUT)
and resistance for current detecting resistor (R).
���� = ����������������2 × ����
[W]
Where:
W
:
is the power consumption of current detecting resistor
IOUT
:
is the motor output current value
R
:
is the current-detecting resistor
To avoid exceeding the rated power consumption of the resistor, consider its power consumption. In addition, design it
in such a way it that it has low impedance and does not have a common impedance with other GND patterns because
motor’s drive current flows through this pattern from the RNFX pin to current-detecting resistor to GND. Do not exceed
the rating because there is the possibility of circuits
’ malfunction etc., if the RNFX voltage has exceeded the maximum
rating (0.7 V). Moreover, be careful because if the RNFX pin is shorted to GND, large current flows without normal
PWM constant current control, then there is the danger that OCP or TSD will operate. If the RNFX pin is open, then
there is the possibility of such malfunction as output current does not flow either, so do not let it open.
(Note 2) x=1 or 2
10 RNFXS
(Note 3)/Input pin of current detection comparator
In this IC, the RNFxS pin, which is the input pin of current detection comparator, is independently arranged in order to
decrease the lowing of the current-detecting accuracy caused by the wire impedance inside the IC of the RNFX pin.
Therefore, be sure to connect the RNFX pin and the RNFXS pin together when using the device in the case of PWM
constant current control. In addition, impedance of board pattern between the RNFX pin and the current-detecting
resistor can decrease accuracy, so connect RNFXS pattern in such a way it is connected near the current-detecting
resistor so accuracy can be increased. Moreover, design the pattern in such a way that there is no noise plunging in. In
addition, be careful because if the RNFXS pin is shorted to GND, large current flows without normal PWM constant
current control and, then there is the danger that OCP or TSD will operate.
(Note 3) x=1 or 2


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