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BD63521EFV

TSZ02201-0P2P0B701180-1-2

© 2016 ROHM Co., Ltd. All rights reserved.

17.Aug.2016 Rev.001

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～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～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. Moreover, please design patterns not to have any common impedance with other

GND patterns.

○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 0.1Ω～0.3Ω for current detection between this terminal and GND In view of the power

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～current-detecting resistor～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).

Ω]・・・（Half step, Eighth step, 1/16step）

Ω]・・・（Full step）

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 (max.2µA) 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.