1ED020I12FTA Datasheet, PDF (10/27 Pages) Infineon Technologies AG – Single IGBT Driver IC

EICEDRIVER®
1ED020I12FTA
Functional Description
2.7
External Protection Features
2.7.1 Desaturation Protection
A desaturation protection ensures the protection of the IGBT at short circuit. When the DESAT voltage goes up
and reaches 9V, the output is driven low. Further, the FAULT output is activated. A programmable blanking time
is used to allow enough time for IGBT saturation. Blanking time is provided by a highly precise internal current
source and an external capacitor.
2.7.2 Active Miller Clamping
A Miller clamp allows sinking the Miller current during a high dV/dt situation. Therefore, the use of a negative
supply voltage can be avoided in many applications. During turn-off, the gate voltage is monitored and the clamp
output is activated when the gate voltage goes below 2V (related to VEE2). The clamp is designed for a Miller
current up to 2A.
2.7.3 Short Circuit Clamping
During short circuit the IGBTs gate voltage tends to rise because of the feedback via the Miller capacitance. An
additional protection circuit connected to OUT and CLAMP limits this voltage to a value slightly higher than the
supply voltage. A current of maximum 500 mA for 10us may be fed back to the supply through one of this paths.
If higher currents are expected or a tighter clamping is desired external Schottky diodes may be added.
2.8
RESET
The reset input has two functions.
Firstly, /RST is in charge of setting back the FAULT output. If /RST is low longer than a given time , /FLT will be
reseted at the rising edge of /RST; otherwise, it will remain unchanged. Moreover, it works as enable/shutdown of
the input logic.
Preliminary Datasheet
8
Version 1.2, 2010-05-21