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| (R) LCP3121 OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE Application Specific Discretes A.S.D.TM FEATURES AND BENEFITS 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 functionprogrammed 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 bidirectionalprotection functioncan be achieved by the use of two LCP3121. COMPLIESWITHTHE FOLLOWINGSTANDARDS : 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 SGS-THOMSON Microelectronics. SO8 PIN-OUT CONFIGURATION C 1 8C Gn 2 Gp 3 7A 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 1kV 25A 2kV 50A 1.5kV 40A 2.5kV 200A (*) 2.5kV 200A (*) 1kV 100A A Gp Gn C 1/6 September 1998 - Ed: 3 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 2/6 LCP3121 1 - OPERATION WITHOUT GATE (Tamb = 25 C) Symbol IRM IR VBR IBO VBO IH C Measured at 50Hz See the functional test circuit VR =-5V F=1MHz 100 100 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 pF 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 3/6 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-onstate 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 4/6 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 LCP 3121 LCP3121 LCP3121 Application 3 : Typical SLIC protection Application 4 : Protection programmed by current IT + A Protec ted 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 5/6 LCP3121 ORDER CODE LCP LINE CARD PROTECTION NUMECAL CODE 31 2 1 RL PACKAGING: RL = tape and reel. = tube. VERSION PACKAGE: 1 = SO8 . PACKAGE MECHANICAL DATA SO8 Plastic REF. A a1 a2 b b1 C c1 D E e e3 F L M S MARKING Package SO8 Type LCP3121 Marking CP3121 3.8 0.4 0.1 0.35 0.19 0.50 4.8 5.8 1.27 3.81 Min. DIMENSIONS Millimetres Typ. Max. Min. 1.75 0.25 0.004 1.65 0.48 0.014 0.25 0.007 0.020 45(typ) 5.0 0.189 6.2 0.228 0.050 0.150 4.0 0.15 1.27 0.016 0.6 8 (max) 0.157 0.050 0.024 0.197 0.244 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) 1998 STMicroelectronics - Printed in Italy - All rights reserved. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com 6/6 |
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