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SLVU2.8Q

Low Voltage TVS Diode for Automotive Applications

Semtech Corporation 

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

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