Datasheet

DocID018539 Rev 3 9/18
TD350E Functional description
18
Equation 1
T
a
[s]  0.7 • R
off
[k] • C
off
[nF]
5.6 Minimum ON time
In order to ensure the proper operation of the 2-level turn-off function, the input ON time
(T
win
) must be greater than the T
winmin
value:
Equation 2
T
winmin
= T
a
+ 2 • R
del
• C
off
R
del
is the internal discharge resistor and C
off
is the external timing capacitor.
Input signals smaller than T
a
are ignored. Input signals larger than T
winmin
are transmitted to
the output stage after the T
a
delay with minimum width distortion (T
w
= T
wout
- T
win
).
For an input signal width T
win
between T
a
and T
winmin
, the output width T
wout
is reduced
below T
win
(pulse distortion) and the IGBT could be partially turned on. These input signals
should be avoided during normal operation.
5.7 Output
The output stage is able to sink 2.3 A and source 1.5 A (typ.) at 25 °C (1.2 A/0.75 A
minimum over the full temperature range). Separate sink and source outputs allow
independent gate charge and discharge control without an extra external diode.
5.8 Fault status output
Fault output is used to signal a fault event (desaturation, UVLO) to a controller. The fault pin
is designed to drive an optocoupler.
5.9 Undervoltage protection
Undervoltage detection protects the application in the event of a low VH supply voltage
(during startup or a fault situation). During undervoltage, the OUTH pin is open and the
OUTL pin is driven low (active pull-down for VH > 2 V, passive pull-down for VH < 2 V). Fault
output signals the undervoltage state and is reset only when undervoltage state disappears.