ICE2QR2280G-1_15 Datasheet, PDF (7/14 Pages) Infineon Technologies AG – 20 W 5 V SMPS Evaluation Board with Quasi- Resonant CoolSET™ ICE2QR2280G-1

20 W 5 V SMPS Evaluation Board with
Quasi-Resonant CoolSET™ ICE2QR2280G-1
Protection features
7.4
Adjustable output overvoltage protection
During off-time of the power switch, the voltage at the zero-crossing pin ZC is monitored for output
overvoltage detection. If the voltage is higher than the preset threshold 3.7 V for a preset period 100 μs, the
IC is latched off.
7.5
Short winding protection
The source current of the MOSFET is sensed via two shunt resistors R4 and R4A in parallel. If the voltage at
the current sensing pin is higher than the preset threshold VCSSW of 1.68 V during the on-time of the power
switch, the IC is latched off. This constitutes a short winding protection. To avoid an accidental latch off, a
spike blanking time of 190 ns is integrated in the output of internal comparator.
7.6
Auto restart for over temperature protection
The IC has a built-in over temperature protection function. When the controller’s temperature reaches
140 °C, the IC will shut down switch and enters into autorestart. This can protect power MOSFET from
overheated.
Application Note
7
Revision 1.1, 2015-04-02