1EDI20N12AF_15 Datasheet, PDF(13/22 Page) Infineon Technologies AG – Single Channel MOSFET and GaN HEMT Gate Driver IC

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1EDI20N12AF_15 Datasheet, PDF (13/22 Pages) Infineon Technologies AG – Single Channel MOSFET and GaN HEMT Gate Driver IC

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4.3

Protection Features

1EDI EiceDRIVERâ¢ Compact

1EDI20N12AF

Functional Description

4.3.1 Undervoltage Lockout (UVLO)

To ensure correct switching 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 VUVLOH levels

(see also Figure 8).

If the power supply voltage VVCC1 of the input chip drops below VUVLOL1 a turn-off signal is sent to the output chip

before power-down. The switch is turned off and the signals at IN+ and IN- are ignored until VVCC1 reaches the

power-up voltage VUVLOH1 again.

If the power supply voltage VVCC2 of the output chip goes down below VUVLOL2 the switch is again turned off and

signals from the input chip are ignored until VVCC2 reaches the power-up voltage VUVLOH2 again.

Note: VVCC2 is always referred to GND2; the output UVLO function thus depends on the total supply voltage.

4.3.2 Active Shut-Down

The Active Shut-Down feature ensures a safe off-state if the output chip is not connected to the power supply, The

gate is clamped at OUT- to GND2.

4.3.3 Short Circuit Clamping

During short circuit the 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 Î¼s. 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 switch. In the non-inverting mode IN+ controls the driver output

while IN- is set to low. In the inverting mode IN- controls the driver output while IN+ is set to high, see Figure 7. A

minimum input pulse width is required 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 driverâs supply is stable. Due to

the low internal voltage drop, switching behaviour is predominantly governed by the gate resistor. Furthermore, it

reduces the power to be dissipated in the driver.

Data Sheet

Rev. 2.0, 2015-06-01

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