Negative Battery Voltage SLIC Protection
ITU-T Solution
Solution Products
Objective
The SLIC (Subscriber Line Interface
Circuit) provides all the BORSCHT
functions such as battery, ringing and
supervision between the codec and
telephone hand set. This PortNote®
solution discusses negative battery
voltage solutions against surge and
power contact threats.
Compliance
ITU-T Basic K.20, K.21, K.45.
• 230 V
rms
, 23 A, 900 seconds withstand.
• 600 V
rms
, 1 A, 0.2 seconds withstand.
• Increased surge withstand to 4 kV 10/700 µs
without a primary protector.
TBU-PL085-200-WH
Alternate Recommendations
Solution
1 TBU® High-Speed Protector:
TBU-PL085-200-WH
2 MOV Devices: MOV-10D391K
MOV-10D391K
Other PortNote® Solutions:
• Dual Supply Voltage SLIC Protection - ITU-T Solution
• Negative Battery Voltage SLIC Protection -
GR-1089-CORE Intra-building Solution
• SLIC Protection - GR-1089-CORE Intra-building Solution
Benefit
This solution provides a high level of protection in
a small PCB area.
GND
V
DD
SLIC
Tip
Tip
MOV-10D391K
SLIC
TBU-PL085-200-WH*
RJ11
Design Kit
-V
BAT
MOV-10D391K
SLIC
Ring
V
SS
Ring
The schematic above illustrates the application protection and does not constitute the complete circuit design. Customers should verify
actual device performance in their specific applications.
PN-DESIGNKIT-42
*Note: The VE950 series (e.g. Le9500, Le9520, Le9530, Le9540) require a 200 mA I
trigger
TBU® High-Speed
Protector for normal operation. All other SLICs may use 100 mA I
trigger
TBU® HSP devices.
REV 10/12
Americas:
Europe:
Tel
+41-(0)41 768 55 55
Fax
+41-(0)41 768 55 10
Tel
+1-951 781-5500
Fax
+1-951 781-5700
Tel
+886-2 256 241 17
Fax
+886-2 256 241 16
Bourns® PortNote® solutions provide protection
recommendations for typical port threats.
For more information, go to:
Asia-Pacific:
www.bourns.com
COPYRIGHT© 2012 • BOURNS, INC. • 10/12 • e/CPK1235 • “PortNote” is a registered service mark of Bourns, Inc.
“Bourns” and “TBU” are registered trademarks of Bourns, Inc. in the U.S. and other countries.
or email: protection@bourns.com
微控制器 MCU
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