1EDS20I12SV Datasheet, PDF (17/33 Pages) Infineon Technologies AG – Single-channel isolated IGBT Driver

EiceDRIVER™ Safe
1EDS - slew rate control IGBT driver IC
4.8
Protection and diagnosis features
4.8.1
Undervoltage lockout (UVLO)
The device is equipped with a system of defined undervoltage lockout (UVLO) levels on both the input and
output side to ensure proper operation of the IGBT.
Any triggering of UVLO will turn-off the IGBT by means of the soft turn-off function. All signals at INP and INN
are ignored until the voltage at terminals VCC1 recovers above V_UVLOH1 at terminals VCC1 and V_UVLOH3 at
terminal PADP.
The IGBT is switched off via terminal OFF only in case of an UVLO event at pin VCC2. Signals from the input
side are ignored until VCC2 recovers to the power-up level of V_UVLOH2. The IC will perform an immediate turn-on
after recovery of VCC2 according to Table 3.
4.8.2
Ready and status output terminals
The ready signal RDY1 for the control side covers the following conditions:
 UVLO status of the control side supply voltage domains at terminals VCC1 and PADP
 Establishment of correct signal transmission from input side to output side across the insulation barrier
The ready signal RDY2 for the output side indicates after a short delay:
 UVLO status of the output side supply voltage VCC2
 Establishment of bidirectional signal transmission across the insulation barrier
Both signals are monitoring signals only and need not to be reset actively.
Table 3
VCC1
UVLO 
UVLO 
UVLO 
X
good
UVLO
X
good
Driver IC status UVLO at VCC1, VCC2 and PADP (EN = high)
VCC2
PADP
RDY1
RDY2
Result
good
good
low
X
SOFF and 5µs watchdog
good
good
high
high
acc. INP / INN (turn-on with preboost)
good
UVLO
low
high
OFF
UVLO 
X
X
low
activate OFF and SOFF simultaneously
UVLO 
good
high
high
acc. INP / INN (turn-on with preboost)
UVLO 
good
low
high
OFF
X
UVLO 
low
high
SOFF and 5µs watchdog
good
UVLO 
high
high
acc. INP / INN (turn-on with preboost)
4.8.3
Fault indication (terminal /FLT)
Terminal /FLT is the indicator for a triggered DESAT or CS event. It is pulled low by an internal FET. The /FLT
function is reset by means of a low signal at terminal EN for more than t_EN,RST = tbd ns
4.8.4
Watchdog
The bidirectional signal transmission across the insulation barrier is monitored by watchdogs on the input and
output side. These are the most important ones:
 The IGBT is switched off via terminal SOFF and additionally switched off via terminal OFF, if the
transmission fails for a given duration.
 Another watchdog activates the terminal OFF after 5 µs in any case of a soft turn-off event.
4.8.5
I/O signature check
The I/O signature check is a feature that allows the confirmation of switching commands sent by the
microcontroller to the driver IC. The SIGO output terminal is an exclusive-or (XOR) combination of the terminals
Target datasheet
17
<Revision 0.73>, 05.06.2014