SCALE™-2 1SC0450E2B0
Preliminary Description & Application Manual
www.power.com/igbt-driver
Page 18
Status
OUT
T/R
(2)
Light Status Feedback
Idle
High
On
Low
Acknowledge
or fault pulse Low
Off
High
Table 6 Signal truth table correlated with the schematics of Fig. 7
Fig. 9 shows the response of the driver in the event of an IGBT short-circuit condition. The fault status is
transferred to the status feedback terminal after the response time. The light is then driven “off” during the
delay to clear the fault state (8μs+T
cshd
). The driver turns the IGBT off after the response time + delay time
T
cshd
. The IGBT can be turned on again by applying a negative edge to the input IN after the fault status has
disappeared.
Fig. 9
Driver behavior and status feedback in the IGBT short-circuit condition
In case of a secondary-side supply under-voltage fault, the fault status remains active as long as this under-
voltage remains. The driver response in the event of a supply under-voltage on VISO-VE is shown in Fig. 10.
Fig. 10 Status feedback in the event of a secondary-side supply under-voltage
(2)
T/R: Transmitter and receiver pair of a fiber-optic link