lb11947 Sanyo Semiconductor Corporation, lb11947 Datasheet - Page 9

• Manufacturer Part Number: lb11947
• Description: Pwm Current Control Type Dc Motor Driver + Switching Regulator
• Manufacturer: Sanyo Semiconductor Corporation

(Motor driver, internal PWM current control operation mode)
PWM current control is made, so that the peak current flowing through the motor coil with PWM = “H” does not exceed
the current level swt with VREF pins (pin 15 (Ach) and pin 13 (Bch)).
<MDINT = “L” (FAST mode>
<MDINT = “H” (SLOW mode)>
PWM
Coil current
CR
PWM
CR
Coil current
Tnc: Noise canceling time [s]
Toff: Switching OFF time [s]
Tnc
Tnc
CHARGE mode
CHARGE mode
Set current
Set current
4V
1V
4V
1V
SLOW mode
LB11947
FAST mode
Toff
Toff
CHARGE mode
Tnc
CHARGE mode
Tnc
SLOW mode
Toff
FAST mode
Toff
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