© by SEMIKRON / 2020-05-25 / Technical Explanation / SKYPER
®
12 PV
PROMGT.1026/ Rev.7/ Template Technical Explanation
Page 17/37
4.8
Error mode selection | Primary side
The configuration pin CFG_ERR selects the behavior of the SKYPER
®
12 PV driver core on error events.
Connecting the CFG_ERR pin to the PWR_GND pin forces the driver to set its outputs to off-state
immediately when an error is detected. As long as the driver has not been reset the error event is reported
at the corresponding output and the driver’s outputs are locked. Whereby, depending on whether an error
is detected on the primary or on the secondary side the driver switches off the connected semiconductors
via the standard turn-off or the soft-off path. If an error occurs on the primary side the driver will activate
the standard turn-off paths of both channels. If an error occurs on the secondary side, the driver will
activate the soft-off path of the affected secondary side. The semiconductor connected to the other
secondary side will be switched off via the standard turn-off path.
If the CFG_ERR pin is connected to the PWR_VS pin, the driver locks its outputs in case of any error event’s
occurrence and, hence, reports the error event at the terminal nERR_OUT. The affected output at which the
error occurred will be set to off-state, immediately. The second output will be set to off state when the
driver has received a turn-off command at the corresponding signal input TOP_OFF/BOT_OFF. Depending
on whether an error is detected on the primary or secondary side the driver activates the standard turn-off
or the soft-off path, as described above.
Further information related to the primary and secondary side error events, as well as on the error reset
conditions is referred in chapter 5.1.
4.9
External error input | Secondary side
Each secondary side of the driver provides an error input (nERR_IN_TOP/nERR_IN_BOT) to handle external
error events. These inputs are low active. Pulling one input to low-level forces the driver into error state.
The behaviour of the driver in case of an external error event depends on the configuration at the
configuration pin CFG_ERR, as described in chapter 4.8.
The external error input is typically used to monitor temperature, current or voltage of modules, phase legs
or systems. The error input of the secondary TOP/BOT side can be disabled by connecting it to the
PWR_VS_P_TOP/PWR_VS_P_BOT pin.
Figure 13 shows a recommended comparator circuitry to process the NTC’s signal and derive the required
logic signal for the input of the SKYPER
®
12 PV. When the voltage at the comparator’s positive input falls
below the voltage level of the negative input the nERR_IN input will be pulled to low-level and generates an
external error event. Assuming that resistors R
3
and R
4
have the same value the comparator’s trip level is
reached when the value of the NTC falls below the value of R
CGF(temp)
. Please note that the negative supply
pin of the comparator is connected to PWR_VS_N which has to be taken into account, in case the NTC
thermistor is monitored by an external application circuit in addition.
Figure 13: SKYPER
®
12 PV | Secondary side | Example of an external error input circuitry
R
1
SKYPER
®
12 PV
PWR_VS_P_TOP X100:03
nERR_IN_TOP X100:04
PWR_GND_TOP X100:08
PWR_VS_N_TOP X100:10
ϑ
R
2
C
1
C
2
R
C
F
G
(t
em
p
)
C
3
R
3
R
4
