1ED020I12-B2 Datasheet, PDF (14/29 Pages) Infineon Technologies AG – Single IGBT Driver IC

EiceDRIVER™
1ED020I12-B2
Functional DescriptionInternal Protection Features
+5V
SGND
IN+
RDY
FLT
RST
VCC1
100n
GND1
IN+
IN-
RDY
/FLT
/RST
VCC2
DESAT
CLAMP
OUT
NC
GND2
VEE 2
+15V
1µ
1k
10R
220p
Figure 5 Application Example Unipolar Supply
4.3
Internal Protection Features
4.3.1 Undervoltage Lockout (UVLO)
To ensure correct switching of IGBTs the device is equipped with an undervoltage lockout for both chips, refer to
Figure 9.
If the power supply voltage V_VCC1 of the input chip drops below V_UVLOL1 a turn-off signal is sent to the output chip
before power-down. The IGBT is switched off and the signals at IN+ and IN- are ignored as long as V_VCC1 reaches
the power-up voltage V_UVLOH1.
If the power supply voltage V_VCC2 of the output chip goes down below V_UVLOL2 the IGBT is switched off and signals
from the input chip are ignored as long as V_VCC2 reaches the power-up voltage V_UVLOH2. VEE2 is not monitored,
otherwise negative supply voltage range from 0 V to -12 V would not be possible.
4.3.2 READY Status Output
The READY output shows the status of three internal protection features.
• UVLO of the input chip
• UVLO of the output chip after a short delay
• Internal signal transmission after a short delay
It is not necessary to reset the READY signal since its state only depends on the status of the former mentioned
protection signals.
4.3.3 Watchdog Timer
During normal operation the internal signal transmission is monitored by a watchdog timer. If the transmission fails
for a given time, the IGBT is switched off and the READY output reports an internal error.
4.3.4 Active Shut-Down
The Active Shut-Down feature ensures a safe IGBT off-state if the output chip is not connected to the power
supply, IGBT gate is clamped at OUT to VEE2.
Final Data Sheet
14
Rev. 2.0, 2012-07-31