tb6641fg TOSHIBA Semiconductor CORPORATION, tb6641fg Datasheet - Page 8

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

3. Undervoltage Lockout Circuit (UVLO)
4. Overvoltage Shutdown Circuit (VSD)
The TB6641FG incorporates an undervoltage lockout circuit. When the supply voltage drops under 8 V
(typ.), all the outputs are turned off (Hi-Z).
The UVLO circuit has a hysteresis of 0.7 V (typ.); the TB6641FG resumes the normal operation at 8.7 V
(typ.).
The TB6641FG incorporates an overvoltage shutdown circuit. If the supply voltage exceeds 53 V (typ.), all
the outputs are turned off (Hi-Z).
The VSD circuit has a hysteresis of 3 V (typ.); the TB6641FG resumes the normal operation at 50 V (typ.).
Note: The VSD circuit is activated if the absolute maximum voltage rating is violated. Note that the circuit is
VSD operation
UVLO operation
provided as an auxiliary only and does not necessarily provide the IC with a perfect protection from any
kind of damages.
UVLO internal signal
VSD internal signal
ALERT output
ALERT output
OUT1, OUT2
OUT1, OUT2
VM voltage
VM voltage
8.7 V (typ.)
8.0 V (typ.)
53 V (typ.)
50 V (typ.)
H
H
H
L
L
L
H
H
L
L
H
L
Normal operation
Normal operation
8
UVLO operation
VSD operation
OFF (Hi-Z)
OFF (Hi-Z)
Normal operation
Normal operation
TB6641FG
2011-06-21