© by SEMIKRON / 2020-05-25 / Technical Explanation / SKYPER
®
12 PV
PROMGT.1026/ Rev.7/ Template Technical Explanation
Page 24/37
5.2
Dead time and Interlock
The internal dead time generation of the SKYPER
®
12 PV as well as the interlock feature can be selected via
the configuration pin CFG_IDT. The following modes are available:
•
Interlock enabled, 2µs dead time
•
Interlock disabled, no dead time
Interlock enabled
To enable the interlock feature the CFG_IDT pin has to be connected to PWR_GND. The interlock feature is
typically used when driving power semiconductor modules in half bridge configuration. The feature
prevents the two outputs from being activated simultaneously, which would lead to a shorted DC-link
connection (bridge shoot through). The interlock feature also allows controlling a power semiconductor
module with one switching signal and its inverted signal at the driver’s inputs TOP_IN/BOT_IN.
The internal timer which generates the dead time, starts with each turn-off command at the inputs
TOP_IN/BOT_IN. As long as the dead time of 2µs has not elapsed, the driver locks the second output. If
the pulse pattern generated by the customer’s controller also includes a dead time, the resulting system
dead time will be determined by either the controller or the driver, depending on whichever dead time
duration is longer. The SKYPER
®
12 PV does not add the internal generated dead time to the dead time of
the pulse pattern of the controller.
Interlock disabled
If the interlock feature is disabled by connecting the configuration pin CFG_IDT to the PWR_VS pin, both
outputs of the driver can be switched independently from each other. Hence, both output channels could be
switched-on at the same time without blocking.
Table 8 shows the resulting system dead time depending on the configuration via the CFG_IDT pin.
Table 8: SKYPER
®
12 PV | Resulting system dead time
CFG_IDT
Interlock
Controller dead time
SKYPER dead time Resulting dead time
LOW
Enabled
No dead time
2µs
2µs
LOW
Enabled
< 2µs
2µs
2µs
LOW
Enabled
> 2µs
2µs
> 2µs
HIGH
Disabled
2µs
No dead time
2µs
HIGH
Disabled
No dead time
No dead time
No dead time
Important Note
When the interlock function is disabled a bridge shoot through has to be prevented by the user’s control
unit.
