Circuit Protection of IEEE 1394 Interface
Set Top Scheme for Digital Household Appliances
VGA Protection Scheme for Security Monitoring

Circuit Protection of IEEE 1394 Interface

Objective:

Surge, as its name implies, is an instantaneous overvoltage beyond the normal operating voltage. Its sources are divided into external sources (overvoltage generated by lightning and switching operation in the power grid on power lines) and internal sources (air conditioning, elevators, welding machines, air compressors and other inductive loads). According to statistics, in the United States, production stoppage and time loss caused by surge are caused by various industries. Direct losses such as equipment maintenance and premature replacement of equipment amount to US$26 billion annually. In China, according to relevant statistics, 63% of the electrical products with problems during the warranty period are caused by surges. According to GB/T 17626.5 IEC 61000-4-5 surge (shock) immunity test, our company has done some collation and testing of low voltage DC lightning protection scheme for your reference.

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Set Top Scheme for Digital Household Appliances

Set Top Box (STB) is a device that connects a TV set with an external signal source. It can convert compressed digital signals into TV content and display them on TV. From the simple function set-top box which only receives digital TV signal at first to all kinds of set-top box high-definition players with various functions nowadays, with the development of set-top box technology, today's set-top box can complete many high-definition, interactive, multi-mode and multi-format decoding in data support. In terms of interface, in order to obtain more data sources, devices can generally provide many kinds of choices, generally can support USB, HDMI, Ethernet interface, hard disk interface and so on.

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VGA Protection Scheme for Security Monitoring

In most of VGA input circuit designs, there are always two power supplies, one is from the connector’s DSUB-5V pin which potential comes from another VGA


output port, the other is from the own power supply circuit of the VGA input port, system 5V. The VDD pin of ESDSRVLC05-4 is directly connected to the connector’s DSUB-5V pin to block the ESD event which comes from the DSUB-5V pin.


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