1EDI60N12AF Datasheet, PDF (13/22 Pages) Infineon Technologies AG – Separate output variant for MOSFET

4.3
Protection Features
1EDI EiceDRIVER™ Compact
Separate output variant for MOSFET
Functional Description
4.3.1 Undervoltage Lockout (UVLO)
To ensure correct switching of MOSFETs 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 MOSFET 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 MOSFET 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 MOSFET off-state if the output chip is not connected to the power
supply, MOSFET gate is clamped at OUT- to GND2.
4.3.3 Short Circuit Clamping
During short circuit the MOSFET’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 MOSFET. 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 MOSFET is predominantly governed by the gate resistor.
Furthermore, it reduces the power to be dissipated by the driver.
Data Sheet
13
Rev. 2.0, 2015-06-01