TC78H600FNG/FTG
2012-09-05
15
Thermal shut down (TSD) circuit
The TC78H600FNG/FTG includes a thermal shutdown circuit, which turns the output transistors off when the
junction temperature (T
j
) exceeds 170°C (typ.).
The output transistors are automatically turned on when T
j
cools past the shutdown threshold, which is lowered
by a hysteresis of 40°C.
TSD = 170°C (design target value) (Note.)
ΔTSD = 40°C (design target value) (Note.)
Note. Toshiba does not implement testing before shipping.
*In thermal shutdown mode, the internal circuitry and outputs assume the same states as in stop mode
(IN1=IN2=L).
ISD (Over current protection)
When any of current which flows in 8 DMOS transistors exceeds 1.7 A (typ.), all outputs are turned off. It does not
resume automatically but latches. It resumes when UVLO operates.
However, masking term of 4μs (typ.) should be added in order to avoid detection error by the noise.
ISD = 1.7A ±0.5A (Note)
Note. Toshiba does not implement testing before shipping.
DMOS power transistor current
1.7A (typ.)
Dead band:
4μs(typ.)
(Latch state)
