1EDI2002AS_15 Datasheet, PDF (41/147 Pages) Infineon Technologies AG – Single Channel Isolated Driver for Inverter Systems AD Step

EiceDRIVER™ SIL
1EDI2002AS
Functional Description
For a Safe Turn-Off sequence, the TTOFF delay is defined by bit field SSTTOF.STVAL. Setting this field to 00_H
completely disables the TTOFF function for all Safe Turn-Off sequences (but this has no effect on Regular Turn-
Off sequences). If this function is to be activated, a minimum value for the delay time has to be programmed. The
plateau level is defined by SSTTOF.GPS.
The timing of a Safe Turn-Off event is in the clock domain of the main secondary oscillator (OSC2). The timing of
a Regular Turn-Off event is in the clock domain of the Start-Stop Oscillator (SSOSC2), leading to high accuracy
and low PWM distortion
When using the TTOFF function (with a non-zero delay), the PWM command is received on pin INP is delayed by
the programmed delay time (Figure 2-13). For pulses larger than the TTOFF delay (t_PULSE > t_TTOFF+two SSOSC
cycles), the output pulse width is kept identical to the input pulse width. For smaller pulses (t_PULSE < t_TTOFF+2 two
SSOSC cycles), the output pulse is identical to the programmed delay. The minimum pulse width delivered by the
device to the IGBT is therefore the programmed delay time extended by two SSOSC cycles.
The device allows for external booster voltage compensation at the IGBT gate. When bit SCFG.VBEC is cleared,
the voltage at TOFF at the plateau corresponds to the programmed value. When bit SCFG.VBEC is set, an
additional V_BE (base emitter junction voltage of an internal pn diode) is substracted from the programmed voltage
at TOFF in order to compensate for the V_BE of an external booster.
Datasheet
41
Hardware Description
Rev. 3.1, 2015-07-30