lb11947 Sanyo Semiconductor Corporation, lb11947 Datasheet - Page 8

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

(Motor driver, logic input truth table)
(*) Don’t care.
(Motor driver, output stage transistor operation mode)
The figure above shows the current direction at PH = “H.”
Note that the upper diode is incorporated and the lower diode is an external Schottky diode.
(Motor driver, output stage transistor operation function)
CHARGE(PH = “H”)
ST
CHARGE(PH = “L”)
ON
H
H
H
H
H
H
L
U1
OFF
L1
SLOW
Mode
FAST
PWM
H
H
H
H
*
L
L
Charge
VM
MD
H
*
*
*
*
*
L
RS
OFF
OFF
OFF
ON
U1
MDINT
H
H
*
L
L
*
*
OFF
U2
OFF
OFF
OFF
L2
ON
ON
U2
PH
H
H
*
L
L
*
*
OFF
OFF
ON
ON
L1
OUT
OFF
OFF
U1
OFF
OFF
L1
H
H
L
L
L
OFF
OFF
ON
ON
L2
OUT-
OFF
OFF
H
H
L
L
L
LB11947
Fast
VM
Standby mode (circuit OFF)
SLOW (short brake) at power ON, forward rotation, and at the current limit
FAST (all OFF) at power ON, forward rotation, and at current limit
SLOW (short brake) at power ON, reverse rotation, and at current limit
FAST (all OFF) at power ON, reverse rotation, and at current limit
Current decay at SLOW (short brake)
Current decay at FAST (all OFF)
RS
OFF
OFF
U2
L2
Operation mode
OFF
ON
U1
L1
VM
Slow
RS
No. 7318 -8/14
OFF
U2
L2
ON