2ED21091S06F View Datasheet(PDF) - Infineon Technologies
Part Name
Description
MFG CO.
'2ED21091S06F' PDF : 26 Pages View PDF
2ED21091S06F
650 V half bridge gate driver with integrated bootstrap diode
5.7
Undervoltage lockout
This IC provides undervoltage lockout protection on both the VCC (logic and low-side circuitry) power supply and
the VBS (high-side circuitry) power supply. Figure 14 is used to illustrate this concept; VCC (or VBS) is plotted over
time and as the waveform crosses the UVLO threshold (VCCUV+/- or VBSUV+/-) the undervoltage protection is enabled
or disabled.
Upon power-up, should the VCC voltage fail to reach the VCCUV+ threshold, the IC won’t turn-on. Additionally, if the
VCC voltage decreases below the VCCUV- threshold during operation, the undervoltage lockout circuitry will
recognize a fault condition and shutdown the high and low-side gate drive outputs.
Upon power-up, should the VBS voltage fail to reach the VBSUV+ threshold, the IC won’t turn-on. Additionally, if the
VBS voltage decreases below the VBSUV- threshold during operation, the undervoltage lockout circuitry will
recognize a fault condition, and shutdown the high-side gate drive outputs of the IC.
The UVLO protection ensures that the IC drives the external power devices only when the gate supply voltage is
sufficient to fully enhance the power devices. Without this feature, the gates of the external power switch could
be driven with a low voltage, resulting in the power switch conducting current while the channel impedance is
high; this could result in very high conduction losses within the power device and could lead to power device
failure.
Figure 14 UVLO protection
5.8
Bootstrap diode
An ultra-fast bootstrap diode is monolithically integrated for establishing the high side supply. The differential
resistor of the diode helps to avoid extremely high inrush currents when initially charging the bootstrap
capacitor. The integrated diode with its resistrance helps save cost and improve reliability by reducing external
components as shown below Figure 15 and Figure 16.
Figure 15 2ED210x with integrated components Figure 16 Standard bootstrap gate driver
Datasheet
www.infineon.com/soi
13 of 26
V 2.22
2020-07-02
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