ICL5101_16 Datasheet, PDF (16/44 Pages) Infineon Technologies AG – Resonant controller IC with PFC for LED driver

2.2.4
Surge Protection
ICL5101
Functional Description
Description SURGE Protection
In case of a surge event, the voltage at the BUS capacitors C5 & C8 rises up, the driver stages of the ICL5101
are shut off when VLSCS > 0.8V and VBUS > 109% for longer than 500ns. After the surge the controller restarts
automatically when VBUS drops below 109% of the rated voltage. This feature allows driving 500V MOSFETs at
the half bridge stage when adequate EMI and DC LINK networking is present. For an effective protection use
CooMOS^TM technology.
SURGE Detection
If the bus voltage exceeds:
VBUS > 109%
and the voltage at the low side current sense pin 2 exceeds:
VLSCS > 0.8V
for longer than
t = 500ns
SURGE Protection
All Gate Drives OFF
Auto Restart:
VBUS < 109%
Measurement
Surge Event of 1.7kV WITHOUT Varistor VR1
Figure 9: SURGE 1.7kV / FULL Load / Detail
L  N / Phase: 90°
Ch 1 dark blue: VLSCS LS Current Sense to IC GND
Ch 2 blue: VBUS to Power GND
Ch 3 magenta: VLSDS LS Drain to Power GND
Ch 4 green: VPFCDS PFC Drain to Power GND
Figure 10: SURGE 1.7kV / FULL Load / Auto Restart
L  N / Phase: 90°
Ch 1 dark blue: VLSCS LS Current Sense to IC GND
Ch 2 blue: VBUS to Power GND
Ch 3 magenta: VLSDS LS Drain to Power GND
Ch 4 green: VPFCDS PFC Drain to Power GND
Surge Event: VBUS > 109% & VLSCS > 800mV
Auto Restart:VBUS < 109%
Datasheet
16
Rev. 1.3, 2016-01-15