1EDI2004AS View Datasheet(PDF) - Infineon Technologies
Part Name
Description
MFG CO.
'1EDI2004AS' PDF : 138 Pages View PDF
EiceDRIVERTM SIL
1EDI2004AS
Protection and Diagnostics
Table 20 OCP Function Overview (cont’d)
Parameter
Short Description
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 internal voltage comparator) to the internal
reference threshold VOCPD1(see Figure 20). The result of the comparison is available by reading bit
SSTAT2.OCPC1.
Note:
Bit SSTAT2.OCPC1 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.
In case the measured voltage at pin OCP is higher than the internal threshold VOCPD1, an Emergency (Safe)
Turn-off sequence is initiated, bit SER.OCPER is set and a fault notification is issued on pin NFLTA (in case of
an OPM transition the state machine - see Chapter 2.4.7). The OCP function is not active while the output stage
is in PWM OFF state.
EiceDRIVER™ SI L
5V
5V
Lo gic
Class A
Ge ne ra tion
Comp1
OCP_Sup_act ive
30 0m V
OCPG
OCP
Rsen se
OCPG
GND2
Figure 20 OCP Function: Principle of Operation
Notes
1. If TLTOFF times are used, these times should be taken into consideration for the blanking time to reach valid
voltage levels.
2. AMCLD delay is not in use for safe-off triggered by DESAT or OCP events.
3. In case the OCP pin is open, the pull-up resistance ensures that an OCP event is generated.
4. Both DESAT and OCP protection mechanisms can be used simultaneously.
Data Sheet
59
Rev. 2.0
2019-01-16
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