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SRV05-4
PROTECTION PRODUCTS
Applications Information (continued)
helps to mitigate the effects of parasitic inductance in
the power supply connection. During an ESD event,
the current will be directed through the integrated TVS
diode to ground. The maximum voltage seen by the
protected IC due to this path will be the clamping
voltage of the device.
Video Interface Protection
Video interfaces are susceptible to transient voltages
resulting from electrostatic discharge (ESD) and “hot
plugging” cables. If left unprotected, the video
interface IC may be damaged or even destroyed.
Protecting a high-speed video port presents some
unique challenges. First, any added protection device
must have extremely low capacitance and low leakage
current so that the integrity of the video signal is not
compromised. Second, the protection component
must be able to absorb high voltage transients without
damage or degradation. As a minimum, the device
should be rated to handle ESD voltages per IEC
61000-4-2, level 4 (±15kV air, ±8kV contact). The
clamping voltage of the device (when conducting high
current ESD pulses) must be sufficiently low enough to
protect the sensitive CMOS IC. If the clamping voltage
is too high, the “protected” device may latch-up or be
destroyed. Finally, the device must take up a relatively
small amount of board space, particularly in portable
applications such as notebooks and handhelds. The
SRV05-4 is designed to meet or exceed all of the
above criteria. A typical video interface protection
circuit is shown in Figure 4. All exposed lines are
protected including R, G, B, H-Sync, V-Sync , and the ID
lines for plug and play monitors.
Figure 4 - Video Interface Protection
SRV05-4
Figure 5 - Dual USB Port Protection
Universal Serial Bus ESD Protection
The SRV05-4 may also be used to protect the USB
ports on monitors, computers, peripherals or portable
systems. Each device will protect up to two USB ports
(Figure 5). When the voltage on the data lines exceed
the bus voltage (plus one diode drop), the internal
rectifiers are forward biased conducting the transient
current away from the protected controller chip. The
TVS diode directs the surge to ground. The TVS diode
also acts to suppress ESD strikes directly on the
voltage bus. Thus, both power and data pins are
protected with a single device.
Figure 6 - SIM Port
? 2008 Semtech Corp.
7
www.semtech.com
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相关代理商/技术参数
SRV05-4.TCT
制造商:Semtech Corporation 功能描述:TVS Diode
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