tb6642fg TOSHIBA Semiconductor CORPORATION, tb6642fg Datasheet - Page 9

• Manufacturer Part Number: tb6642fg
• Description: Full-bridge Dc Motor Driver Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

5.
Thermal Shutdown Circuit
The TB6642FG incorporates a thermal shutdown circuit. If the junction temperature (T
the outputs are turned off (Hi-Z).
Stop time is determined by oscillation frequency of OSC capacitor.
Example of formula: OSC frequency: fosc = 8/（Cosc [F]  10
Stop time: toff = 5.17/ fosc [s] (typ.)
OSC terminal should be connected to the GND in order not to recover the operation automatically after thermal
shut down.
Driving both the IN1 pin and IN2 pin Low allows a release of the shutdown operation; the TB6642FG resumes the
normal operation.
TSD = 170°C (typ.)
<OSC：Connecting to the capacitor>
Stop time setting signal
Junction temperature (T
TSD internal signal
ALERT output
OUT1, OUT2
OSC
H（Hi-Z）
j
)
170°C (typ.)
H
H
L
L
L
H
L
(TSD)
Normal operation
9
6
TSD operation
）[Hz] (typ.)
toff:OSC set value
OFF (Hi-Z)
j
Normal operation
) exceeds 170°C (typ.), all
TB6642FG
2011-06-21