SLVU2.8Q Datasheet, PDF (7/9 Pages) Semtech Corporation – Low Voltage TVS Diode for Automotive Applications

SLVU2.8Q
PROTECTION PRODUCTS
Analog Video Input Protection
The SLVU2.8Q can be used in conjunction with a PTC
thermistor to protect analog video inputs as shown
below. During an overcurrent condition, the PTC will
heat up and reduce the current to the load to a low
level, protecting downstream components. The reac-
tion time of the PTC depends on several factors that
are not very well controlled. This means that protected
components can potentially be exposed to damaging
overcurrent until there is enough power dissipation to
trigger the PTC. The SLVU2.8Q will protect the down
stream device until the PTC triggers. The figure at the
right shows the typical response of the protection
circuit to an overvoltage event. In addition to protect-
ing the circuit until the PTC triggers, the SLVU2.8Q
serves to protect components during ESD events. The
SLVU2.8Q is capable of withstanding a +/-25kV con-
tact discharge per IEC 61000-4-2.
Input Voltage
Current through SLVU2.8Q
Output Voltage
Protection circuit response to an overvoltage event
L1
L.2
VIDEO
ENCODER or
DRIVER
C1
C2
C3
SLVU2.8Q
VIDEO IN/OUT
© 2011 Semtech Corp.
Analog Video Protection Circuit
7
www.semtech.com