1EDI05I12AF_15 Datasheet, PDF (13/22 Pages) Infineon Technologies AG – Separate output variant for IGBT

4.3
Protection Features
1EDI EiceDRIVER™ Compact
Separate output variant for IGBT
Functional Description
4.3.1 Undervoltage Lockout (UVLO)
To ensure correct switching of IGBTs the device is equipped with an undervoltage lockout for input and output
independently. Operation starts only after both VCC levels have increased beyond the respective V_UVLOH levels
(see also Figure 8).
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 until V_VCC1 reaches the
power-up voltage V_UVLOH1 again.
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 until V_VCC2 reaches the power-up voltage V_UVLOH2 again.
Note: V_VCC2 is always referred to GND2 and does not differentiate between unipolar or bipolar supply.
4.3.2 Active Shut-Down
The Active Shut-Down feature ensures a safe IGBT off-state in case the output chip is not connected to the power
supply or an under voltage lockout is in effect. The IGBT gate is clamped at OUT- to GND2.
4.3.3 Short Circuit Clamping
During short circuit the IGBT’s gate voltage tends to rise because of the feedback via the Miller capacitance. An
additional protection circuit connected to OUT+ limits this voltage to a value slightly higher than the supply voltage.
A maximum current of 500 mA may be fed back to the supply through this path for 10 μs. If higher currents are
expected or tighter clamping is desired external Schottky diodes may be added.
4.4
Non-Inverting and Inverting Inputs
There are two possible input modes to control the IGBT. At non-inverting mode IN+ controls the driver output while
IN- is set to low. At inverting mode IN- controls the driver output while IN+ is set to high, please see Figure 7. A
minimum input pulse width is defined to filter occasional glitches.
4.5
Driver Outputs
The output driver section uses MOSFETs to provide a rail-to-rail output. This feature permits that tight control of
gate voltage during on-state and short circuit can be maintained as long as the driver’s supply is stable. Due to
the low internal voltage drop, switching behaviour of the IGBT is predominantly governed by the gate resistor.
Furthermore, it reduces the power to be dissipated by the driver.
Data Sheet
13
Rev. 2.0, 2014-11-10