BH6578FVM_11 Datasheet, PDF (5/9 Pages) Rohm – 0.5A or Less Reversible Motor Drivers (Single Moter)

BH6578FVM,BD7931F
●Interfaces
BH6578FVM
LDCONT
BD7931F
Technical Note
LDCONT
VCC
10KΩ
6
39KΩ
10KΩ
6
49.6KΩ
OUT+/OUT-
Fig.14
INFWD/INREV
VCC
2
3
VCC
VCC
200KΩ
7
8
50KΩ
50KΩ
OUT+/OUT-
Fig.17
FIN/RIN
VCC
2
3
200KΩ
7
8
50KΩ
50KΩ
50KΩ
50KΩ
Fig.15
Fig.16
Fig.18
Fig.19
●Operations
(1) CONTROL LOGIC
Operation of each mode is carried out as follows:
When INFWD is “H” and INREV is “L,” the normal rotation mode is achieved and current flows from OUT⁺ to OUT^-.
When both INFWD and INREV are “H,” the brake mode is achieved. Operation in such event is described as follows:
the top-side transistor turns OFF to stop supplying motor drive current, the bottom-side transistor turns ON to absorb
reverse EMF of motor and applies brake to motor. When both INFWD and INREV are “L,” OUT⁺ and OUT^- potentials
become open and the motor stops.
(2) LOADING CONT
Controlling the output voltage can vary voltage applied to the motor and can control the motor speed. By the voltage
entered to the CONT terminal, the output H voltage can be controlled (gain 6dB Typ.). Even if the voltage entered is
increased more than necessary (Vcc Max), the output voltage never exceeds the power supply voltage.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/8
2011.05 - Rev.B