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(R)
LCP3121
OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE
Application Specific Discretes A.S.D.TM
FEATURES AND BENEFITS
s
s
s
s
s
UNIDIRECTIONAL OVERVOLTAGE SUPPRESSOR PROGRAMMABLE BY VOLTAGE AND CURRENT: PROGRAMMABLE BREAKDOWN VOLTAGE UP TO 100 V. PROGRAMMABLE CURRENT LIMITATION FROM 120 mA TO 600 mA. MULTI-LINE PROTECTION MODE : ONE DEVICE CAN PROTECT SEVERAL LINES. HIGH SURGE CURRENT CAPABILITY : IPP = 100A for 10/1000 s. DESCRIPTION Dedicated to the protection of sensitive telecom equipment, the LCP3121 provides protection which can be programmed by both voltage and current. The breakdown voltage can be easily programmed by using an external zener diode. The protection function programmed by the current is achieved with the use of a resistor between the gate and the cathode. The value of the resistor will determine the level of the desired current before the triggering of the device. A multiple protection mode is also performed when using several diodes providing each line interface with an optimized protection level. If desired, a bidirectional protection function can be achieved by the use of two LCP3121. COMPLIES WITH THE FOLLOWING STANDARDS : CCITT K20 : VDE 0433 : VDE 0878 : FCC part 68 : BELLCORE TR-NWT-001089 : BELLCORE TR-NWT-000974 :
(*) with series resistors or PTC. TM: ASD is trademarks of STMicroelectronics.
SO-8
PIN-OUT CONFIGURATION
C
1
8C
Gn
2
7A
Gp 3
6
A
C
4
5C
All cathod pins must be externally connected FUNCTIONAL DIAGRAM
10/700s 5/310s 10/700s 5/310s 1.2/50s 1/20s 2/10s 2/10s 2/10s 2/10s 10/1000s 10/1000s
6kV 150A 2kV 50A 1.5kV 40A 2.5kV 200A (*) 2.5kV 200A (*) 1kV 100A
A Gp
Gn
C
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April 2003 - Ed: 4
LCP3121
ABSOLUTE MAXIMUM RATINGS ( Tamb = 25C) Symbol IPP ITSM VAC VGA Tstg Tj TL Parameter Peak pulse current (see note 1) Non repetitive surge peak on-state current (F = 50 Hz) Maximum voltage between A and C Maximum voltage between G (Gn or Gp) and A Storage temperature range Maximum junction temperature Maximum lead temperature for soldering during 10s 10/1000s tp = 10ms t = 1s Value 100 16 8 100 80 - 40 to + 150 150 260 Unit A A V C C
Note 1 : Pulse waveform : 10/1000s tr=10s
% I PP
tp=1000s
100
50
0 tr tp
t
THERMAL RESISTANCE Symbol Rth (j-a) Junction to ambient Parameter Value 170 Unit C/W
ELECTRICAL CHARACTERISTICS (Tamb = 25C) Symbol VRM VBR VBO IH IBO IRM IR IPP VR Coff VG IGP IGN Parameter Stand-off voltage Breakdown voltage Breakover voltage Holding current Breakover current Leakage current at VRM Leakage current at VR Peak pulse current Continuous reverse voltage Off-state capacitance Gate voltage Gp triggering current Gn triggering current
VR I BO IH I RM IR VRM VBR VBO I PP
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LCP3121
1 - OPERATION WITHOUT GATE (Tamb = 25 C) Symbol IRM IR VBR IBO VBO IH Measured at 50Hz See the functional test circuit 100 VRM = 60V VRM = 90V at VR = 180V at 1mA 100 80 500 180 Test conditions Min. Max. 5 8 50 Unit A A V mA V mA
2 - OPERATION WITH GATE (Tamb = 25 C) Symbol VG (note1) IGP IGN Test conditions IGATE = 200mA (for eigher Gn or Gp) VAnode-cathode = 60V VAnode-cathode = 60V 80 Min. 0.6 Max. 1.8 180 200 Unit V mA mA
Note 1 : VG = VGN, measured between Gn and cathode VG = VGP, measured between Gp and anode
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LCP3121
FUNCTIONAL HOLDING CURRENT (IH) TEST CIRCUIT : GO-NO GO TEST
R
D.U.T -VP
VBAT = -48 V
Surge generator
This is a GO-NO GO test which allows to confirm the holding current (IH) level in a functional test circuit. TEST PROCEDURE : - Adjust the current level at the IH value by short circuiting the D.U.T. - Fire the D.U.T. with a surge current : IPP = 10A, 10/1000s. - The D.U.T. will come back to the off-state within a duration of 50ms max.
Fig. 1: Maximum non repetitive surge peak-on-state current versus overload duration.
Fig. 2: Relative variation of holding current versus junction temperature (typical values).
ITSM (A)
20 18 16 14 12
F=50Hz Tj initial = 25c
IH [Tj] / IH [Tj=25C]
1.4 1.2 1.0 0.8
10 8 6 4
0.6 0.4 0.2
2 0 0.01 0.10 1
t(s)
10 100 1000
Tj(C)
-20 0 20 40 60 80 100 120
0.0 -40
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LCP3121
APPLICATION EXAMPLES Application 1: Common protection for SLIC without integrated ring generator Application 2: Common protection for SLIC with integrated ring generator
-Vbat TIP
-Vbat +Vbat TIP
4*SMBYW01-200
SLIC
RING
4*SMBYW01-200
SLIC L3000N
RING
-Vbat TIP
-Vbat +Vbat TIP
4*SMBYW01-200
SLIC
RING
4*SMBYW01-200
SLIC L3000N
RING
-Vbat C Gn A
+Vbat C Gp A C Gn A
-Vbat
LCP3121
LCP3121
LCP3121
Application 3: Typical SLIC protection
Application 4: Protection programmed by current for any application
IT +
A
Protected
LCP3121
-Vbat
Gn
Circuit
C
TIP
Ra
LCP3121 4*SMBYW01-200 A Gn C
IT = IG +
SLIC
V G Ra
CURRENT TOLERANCE
-Vbat RING
Ra (+/-5%) 4.7 5.6 6.8 8.2 10 12
IT mA min 202 182 164 150 137 128
IT mA max 603 538 479 431 388 358
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LCP3121
ORDER CODE
LCP 31 2 1 RL
LINE CARD PROTECTION NUMERAL CODE PACKAGING: RL = Tape and reel PACKAGE: 1 = SO-8
VERSION
PACKAGE MECHANICAL DATA SO-8 Plastic REF. A a1 a2 b b1 C c1 D E e e3 F L M S MARKING Package SO-8 Type LCP3121 Marking CP3121 3.8 0.4 4.8 5.8 1.27 3.81 0.35 0.19 0.50 0.1 Min.
DIMENSIONS Millimetres Typ. Max. 1.75 0.25 0.004 1.65 0.48 0.014 0.25 0.007 0.020 45 (typ) 5.0 6.2 0.189 0.228 0.050 0.150 4.0 0.6 8 (max) 0.15 0.157 0.050 0.024 1.27 0.016 0.197 0.244 Min. Inches Typ. Max. 0.069 0.010 0.065 0.019 0.010
Weight = 0.08 g Packaging : Products supplied in anti-static tubes or tape and reel.
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics (c) 2003 STMicroelectronics - Printed in Italy - All rights reserved. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com 6/6

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