1EDI2002AS_15 Datasheet, PDF (62/147 Pages) Infineon Technologies AG – Single Channel Isolated Driver for Inverter Systems AD Step

VTON / VTOFF
VCC2
EiceDRIVER™ SIL
1EDI2002AS
Protection and Diagnostics
tTTOFF
VEE2
VDESAT
VCC2
tBLANK
time
0V
time
Figure 3-3 DESAT Operation with DESAT clamping enabled
3.2.2
Overcurrent Protection
The integrated Over Current Protection (OCP) functionality is summarized in Table 3-3:
Table 3-3 OCP Function Overview
Parameter
Short Description
Function
Monitoring of the voltage drop over an external resistor located on the auxiliary
emitter path of the IGBT.
Periodicity
Continuous while device issues a PWM ON command.
Action in case of failure event 1. Emergency (Safe) Turn-off Sequence.
2. Error Flag SER.OCPER is set.
3. Assertion of signal NFLTA.
Programmability
No
In-System Testability
Yes (see Chapter 3.5.6).
The integrated Over Current Protection (OCP) function aims at protecting the IGBT in case of overcurrent and
short-circuit conditions. The voltage drop over a sense resistor located on the auxiliary emitter path of the IGBT is
monitored via the OCP while the device issues a PWM ON command. The voltage at pin OCP is externally filtered
by an (optional) RC filter and compared (using several internal voltage comparators) to the internal reference
thresholds V_OCPD1 and V_OCPD2 (see Figure 3-4). The result of these comparisons is available by reading bits
SSTAT2.OCPC1 and SSTAT2.OCPC2.
Note: Bits SSTAT2.OCPC1 and OCPC2 are blanked by the selected blanking time.
At the beginning of a turn-on sequence, the internal evaluation of the voltage at pin OCP is inhibited for the
duration the blanking time defined by register SOCP. Once the blanking time has elapsed, the voltage at pin OCP
is compared to an internal reference voltage.
Datasheet
62
Hardware Description
Rev. 3.1, 2015-07-30