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BD63621MUV Datasheet(Scheda tecnica) 4 Page - Rohm

Numero della parte BD63621MUV
Dettagli  Stepping Motor Driver
Download  29 Pages
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Produttore  ROHM [Rohm]
Homepage  http://www.rohm.com
Logo ROHM - Rohm

BD63621MUV Datasheet(HTML) 4 Page - Rohm

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BD63621MUV
TSZ02201-0P2P0B701290-1-2
© 2017 ROHM Co., Ltd. All rights reserved.
21.Dec.2020 Rev.002
www.rohm.com
TSZ22111・15・001
○VCC1,VCC2/Power supply terminal
Motor’s drive current is flowing in it, so please wire in such a way that the wire is thick & short and has low impedance.
Voltage VCC may have great fluctuation, so please arrange the bypass capacitor of about 100µ to 470µF as close to the
terminal as possible and adjust in such a way that the voltage VCC is stable. Please increase the capacity if needed
especially when a large current is used or those motors that have great back electromotive force are used. In addition, for
the purpose of reducing of power supply’s impedance in wide frequency bandwidth, parallel connection of multi-layered
ceramic capacitor of 0.01µ to 0.1µF etc is recommended. Extreme care must be used to make sure that the voltage VCC
does not exceed the rating even for a moment. VCC1 & VCC2 are shorted inside IC, so please be sure to short externally
VCC1 & VCC2 when using. If used without shorting, malfunction or destruction may occur because of concentration of
current routes etc., so please make sure that they are shorted when in use. Still more, in the power supply terminal, there is
built-in clamp component for preventing of electrostatic destruction. If steep pulse or voltage of surge more that maximum
absolute rating is applied, this clamp component operates, as a result there is the danger of destruction, so please be sure
that the maximum absolute rating must not be exceeded. It is effective to mount a Zener diode of about the maximum
absolute rating. Moreover, the diode for preventing of electrostatic destruction is inserted between VCC terminal and GND
terminal, as a result there is the danger of IC destruction if reverse voltage is applied between VCC terminal and GND
terminal, so please be careful.
○GND/Ground terminal
In order to reduce the noise caused by switching current and to stabilize the internal reference voltage of IC, please wire in
such a way that the wiring impedance from this terminal is made as low as possible to achieve the lowest electrical potential
no matter what operating state it may be.
○OUT1A,OUT1B,OUT2A,OUT2B/H Bridge output terminal
Motor’s drive current is flowing in it, so please wire in such a way that the wire is thick & short and has low impedance. It is
also effective to add a Schottky diode if output has positive or negative great fluctuation when large current is used etc, for
example, if counter electromotive voltage etc. is great. Moreover, in the output terminal, there is built-in clamp component
for preventing of electrostatic destruction. If steep pulse or voltage of surge more than maximum absolute rating is applied,
this clamp component operates, as a result there is the danger of even destruction, so please be sure that the maximum
absolute rating must not be exceeded.
○RNF1,RNF2/Connection terminal of resistor for detecting of output current
Please connect the resistor of 0.1
Ω to 0.3Ω for current detection between this terminal and GND. In view of the power
consumption of the current-detecting resistor, please determine the resistor in such a way that W= IOUT2・R[W] does not
exceed the power dissipation of the resistor. In addition, please wire in such a way that it has a low impedance and does
not have a impedance in common with other GND patterns because motor’s drive current flows in the pattern through RNF
terminal to current-detecting resistor to
GND. Please do not exceed the rating because there is the possibility of circuits’
malfunction etc. if RNF voltage has exceeded the maximum rating (0.7V). Moreover, please be careful because if RNF
terminal 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 RNF terminal is open, then there is the possibility of such malfunction as output current does
not flow either, so please do not let it open.
○RNF1S,RNF2S/Input terminal of current limit comparator
In this series, RNFS terminal, which is the input terminal of current limit comparator, is independently arranged in order to
decrease the lowering of current-detecting accuracy caused by the wire impedance inside the IC of RNF terminal.
Therefore, please be sure to connect RNF terminal and RNFS terminal together when using in the case of PWM constant
current control. In addition, because the wires from RNFS terminal is connected near the current-detecting resistor in the
case of interconnection, the lowering of current-detecting accuracy, which is caused by the impedance of board pattern
between RNF terminal and the current-detecting resistor, can be decreased. Moreover, please design the pattern in such a
way that there is no noise plunging. In addition, please be careful because if terminals of RNF1S & RNF2S are shorted to
GND, large current flows without normal PWM constant current control and, then there is the danger that OCP or TSD will
operate.
○VREF/Output current value setting terminal
This is the terminal to set the output current value. The output current value can be set by VREF voltage and
current-detecting resistor (RNF resistor).
Output current IOUT [A] = {VREF [V] / 5(division ratio inside IC)} / RNF [
Ω]
Please avoid using it with VREF terminal open because if VREF terminal is open, the input is unsettled, and the VREF
voltage increases, and then there is the possibility of such malfunctions as the setting current increases and a large current
flows etc. Please keep to the input voltage range because if the voltage of over 3V is applied on VREF terminal, then there
is also the danger that a large current flows in the output and so OCP or TSD will operate. Besides, please take into
consideration the outflow current (Max2µA) if inputted by resistance division when selecting the resistance value. The
minimum current, which can be controlled by VREF voltage, is determined by motor coil’s L & R values and minimum ON
time because there is a minimum ON time in PWM drive.


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