tb6641fg TOSHIBA Semiconductor CORPORATION, tb6641fg Datasheet - Page 7

• Manufacturer Part Number: tb6641fg
• Description: Full-bridge Dc Motor Driver Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Functional Description
purposes.
The equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory
Timing charts may be simplified for explanatory purposes.
1. Input/Output Functions
2. Protective Operation Alert Output (ALERT)
RSGND (8)
OUT2 (10)
TISD (14)
OUT1 (7)
Pin No.
The ALERT pin behaves as an open-drain output and provides a high-impedance state on output being
pulled up by a resistor externally wired.
The output is Low when the TB6641FG performs a normal operation (in which state the operational mode is
selectable through the IN1 pin and IN2 pin among CW, CCW, Short Brake and Stop modes.).
In any other cases (in which state the thermal shutdown circuit (TSD), overcurrent shutdown circuit (ISD),
overvoltage shutdown circuit (VSD) and/or undervoltage lockout (UVLO) is activated), the output is High.
Driving both the IN1 pin and IN2 pin Low allows a release of the shutdown operations; the TB6641FG
resumes the normal operations.
IN1
H
H
L
L
The pin connects a resistor controlling
overcurrent detection time.
The RSGND pin must be connected to a
resistor for detection when it is used in the
PWM constant-current control; it must be
earthed to the ground, otherwise.
Utmost care must be taken for designing the
pin-arrangement pattern because a large
current flows through these pins.
Input
IN2
H
H
L
L
I/O Signal
PWM
H
H
H
H
L
L
L
L
7
OUT1
H
L
L
L
L
L
OFF (Hi-Z)
OUT2
I/O Internal Circuit
H
L
L
L
L
L
0.4 V (typ.)
Output
Short brake
CW/CCW
Short brake
CCW/CW
Short brake
Stop
(a release of TSD and/or ISD)
VM
OUT1 (OUT2)
TISD
RSGND
Mode
TB6641FG
2011-06-21