ICE2QS03G_16 Datasheet, PDF (22/28 Pages) Infineon Technologies AG – 45 W adapter demo board

45 W adapter demo board
Using the new 800 V CoolMOS™ P7 and ICE2QS03G quasi-resonant PWM controller
Measurements
7.3
Surge testing
In order for the power supply to be robust enough for abnormal line conditions such as lightning strikes or
failures of other electronics on the line, it needs to survive surge testing. The 45 W power supply was tested to
the 2 kV EN61000 surge conditions and still had 96 V of margin under worst case conditions for the MOSFET V_DS.
Table 11
EN61000 surge requirements
Level
Class 1 protected environment
Class 2 electrical cables are separated
Class 3 electrical cables run in parallel
Class 4 outdoor
Surge voltage L-N (kV)
0.25
0.5
1.0
2.0
Surge voltage L-PE, N-PE (kV)
0.5
1.0
2.0
4.0
Figure 25
IEC61000 2 kV surge test was performed on the adapter while operating under full load (45 W). The
highest voltage that was reached across the Q1 V_DS was 704 V. The surge event can be seen on CH1
when the VBUS rapidly rises. The bus capacitor (C1) and line filter values are critical for determining
the peak surge voltage.
CH1 (Yellow): V_C1, VBUS
CH2 (Cyan):
Q1 VDS
CH3 (Magenta): Q1 VGS
CH4 (Green): Q1 IDS
Application Note
22
Revision 1.0
2016-06-27