LCP1531 Programmable transient voltage suppressor for SLIC protection Datasheet - production data Features • Dual programmable transient suppressor • Wide negative firing voltage range: VGn = -175 V max. • Low dynamic switching voltages: VFP and VDGL SO-8 • Low gate triggering current: IGT = 5 mA max • Peak pulse current: IPP = 37.5 A (5/310 µs) Figure 1. LCP1531 functional diagram • Holding current: IH = 150 mA min. • Low space consuming package TIP 1 TIP Gn GND NC GND RING RING Benefits • A Trisil™ is not subject to ageing and provides a fail-safe mode in short circuit for better protection. • Trisils are used to help equipment to meet various standards such as YDT695, GR-1089 and ITU-T K20/21. • Trisils are UL94 V0 resin approved and are UL497B approved [file: E136224]). Description These devices are ideally suited to meet the protection requirement of VoIP SLICs located in next generation residential gateways. They can be used for protecting any ringing SLIC since they meet the protection standard requirements. Positive overvoltages are clamped by 2 diodes. Negative surges are suppressed by 2 thyristors, their breakdown voltage being referenced to -VBAT through the gate. These components present a very low gate triggering current (IGT) to reduce the current consumption on printed circuit board during the firing phase. TM: Trisil is a trademark of STMicroelectronics August 2013 This is information on a product in full production. DocID13397 Rev 5 1/10 www.st.com Characteristics 1 LCP1531 Characteristics Table 1. Standards compliance Standard Peak surge voltage Voltage waveform Required peak current Current waveform Minimum serial resistor to meet standard (Ω) (A) (V) 2500 1000 2/10 µs 10/1000 µs 500 100 2/10 µs 10/1000 µs 20 30 5000 2/10 µs 500 2/10 µs 40 1500 2/10 µs 100 2/10 µs 0 ITU-T-K20/K21 6000 1500 10/700 µs 150 37.5 5/310 µs 120 0 ITU-T-K20 (IEC 61000-4-2) 8000 15000 1/60 ns IEC 61000-4-5 4000 4000 10/700 µs 1.2/50 µs 100 100 5/310 µs 8/20 µs 67 22 1500 800 10/160 µs 10/560 µs 200 100 10/160 µs 10/560 µs 26 17 1500 9/720 µs 37.5 5/320 µs 0 GR-1089 Core First level GR-1089 Core Second level GR-1089 Core Intra-building TIA-968-A, lightning surge type A TIA-968-A, lightning surge type B ESD contact discharge ESD air discharge 0 0 Table 2. Thermal resistance Symbol Rth(j-a) 2/10 Parameter Junction to ambient DocID13397 Rev 5 Value Unit 120 °C/W LCP1531 Characteristics Table 3. Absolute ratings (Tamb = 25 °C, unless otherwise specified) Symbol Parameter Value Unit 25 65 32 37.5 45 60 100 A IPP Peak pulse current 10/1000 µs 8/20 µs 10/560 µs 5/310 µs 10/160 µs 1/20 µs 2/10 µs ITSM Non-repetitive surge peak on-state current (50 Hz sinusoidal) t = 20 ms t = 200 ms t=1s 16 9 6 A IGSM Maximum gate current (50 Hz sinusoidal) t = 10 ms 2 A VGn Negative battery voltage range -175 V Tstg Tj Storage temperature range Operating junction temperature range -55 to +150 -40 to +150 °C TL Maximum lead temperature for soldering during 10 s. 260 °C Figure 2. Electrical characteristics (definitions) Symbol IGT VFP VGT VF IRG IH VRG VDGL IPP IR VF C = = = = = = = = = = = = I Parameter Gate triggering current Peak forward voltage LINE / GND Gate triggering voltage Forward drop voltage LINE /GND Reverse leakage current GATE / LINE Holding current Reverse voltage GATE / LINE Dynamic switching voltage GATE / LINE Peak pulse current Breakdown current Forward drop voltage LINE / GND Capacitance LINE /GND VR VF IR V IH IPP Figure 3. Pulse waveform % IPP Pulse waveform 10/1000 µs: tr = 10 µs tp = 1000 µs 100 50 0 tr tp DocID13397 Rev 5 3/10 10 Characteristics LCP1531 Table 4. Parameters related to the diode LINE / GND (Tamb = 25 °C) Symbol Test conditions VF IF = 5 A VFP 10/700 µs VPP = 1.5 kV Max. Unit t = 500 µs 3 V RS = 15 Ω 5 V Table 5. Parameters related to the protection thyristors (Tamb = 25 °C) Symbol Test conditions Min. Max. Unit 5 mA IGT VLINE = -48 V 0.1 IH VGn = -48 V 150 IRG VRG = -75 V VGn = -48 VDGL mA 5 µA 7 V V (1) 10/700 µs VPP = 1.5 kV RS = 15 Ω IPP = 27.5 A 1. The oscillations with a time duration lower than 50 ns are not taken into account. Table 6. Parameters related to diode and protection thyristors (Tamb = 25 °C,) Symbol Test conditions IR VGn / LINE = -1 V C VLINE = -50 V, VRMS = 1 V, F = 1 MHz VLINE = -2 V, VRMS = 1 V, F = 1 MHz VRM = -75 V Typ. Tj = 25 °C Max. Unit 5 µA 15 35 pF Table 7. Recommended gate capacitance Symbol CG 4/10 Component Gate decoupling capacitance DocID13397 Rev 5 Min. Typ. 100 220 Max. Unit nF LCP1531 Technical information Figure 4. LCP1531 concept behavior Rs1 L1 TIP GND -Vbat V Tip ID1 IG T1 Th1 D1 Gn GND C Rs2 VRing RING L2 Figure 4. shows the classical protection circuit using the LCP1531 crowbar concept. This topology has been developed to protect the new high voltage SLICs. It allows to program the negative firing threshold while the positive clamping value is fixed at GND. When a negative surge occurs on one wire (L1 for example) a current IG flows through the base of the transistor T1 and then injects a current in the gate of the thyristor Th1. Th1 fires and all the surge current flows through the ground. After the surge when the current flowing through Th1 becomes less negative than the holding current IH, then Th1 switches off. When a positive surge occurs on one wire (L1 for example) the diode D1 conducts and the surge current flows through the ground. Figure 5. Example of PCB layout based on LCP1531 protection LCP1531 GND To line side 100 nF 2 Technical information To SLIC side Figure 5. shows the classical PCB layout used to optimize line protection. The capacitor C is used to speed up the crowbar structure firing during the fast surge edges. This allows minimization of the dynamic breakover voltage at the SLIC Tip and Ring inputs during fast strikes. Note that this capacitor is generally present around the SLIC - Vbat pin. So to be efficient it has to be as close as possible from the LCP1531 Gate pin and from the reference ground track (or plan) (see Figure 5.). The optimized value for C is 100 nF. DocID13397 Rev 5 5/10 10 Technical information LCP1531 The series resistors Rs1 and Rs2 designed in Figure 4. represent the fuse resistors or the PTC which are mandatory to withstand the power contact or the power induction tests imposed by the various country standards. Taking into account this fact the actual lightning surge current flowing through the LCP1531 is equal to: I surge = V surge / (Rg + Rs) With: V surge = peak surge voltage imposed by the standard. Rg = series resistor of the surge generator Rs = series resistor of the line card (e.g. PTC) The LCP1531 is particularly optimized for the new telecom applications such as the fiber in the loop, the WLL, the remote central office. In this case, the operating voltages are smaller than in the classical system. This makes the high voltage SLICs particularly suitable. The schematics of Figure 6. gives the most frequent topology used for these applications. Figure 6. Protection of high voltage SLIC -Vbat Rs (*) TIP Gn GND TIP GND 100 nF SLIC GND Line RING Rs (*) RING LCP1531 Line card Rs (*) = PTC or fuse resistor Figure 7. Surge peak current versus overload duration Figure 8. Relative variation of holding current versus junction temperature IH[Tj] / IH[Tj=25°C] ITSM(A) 1.3 24 F=50Hz Tj initial=25°C 1.2 20 1.1 16 1 12 0.9 8 0.8 4 Tj(°C) t(s) 0 1.E-02 6/10 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03 0.7 -40 -30 DocID13397 Rev 5 -20 -10 0 10 20 30 40 50 60 70 80 90 LCP1531 3 Package information Package information • Epoxy meets UL94, V0 • Lead-free packages In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 9. SO-8 dimension definitions L c1 C a2 a3 A e b a1 S b1 E e3 D M 8 5 F 1 4 Projection DocID13397 Rev 5 7/10 10 Package information LCP1531 Table 8. SO-8 dimension values Dimensions Ref. Millimeters Min. Typ. A Inches Max. Min. Typ. 1.75 0.069 A1 0.1 A2 1.25 b 0.28 0.48 0.011 0.019 C 0.17 0.23 0.007 0.009 D 4.80 4.90 5.00 0.189 0.193 0.197 E 5.80 6.00 6.20 0.228 0.236 0.244 E1 3.80 3.90 4.00 0.150 0.154 0.157 e 0.25 0.004 0.010 0.049 1.27 0.050 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 L1 k° ccc 1.04 0.041 0 8 0 0.10 6.8 (0.268) 0.6 (0.024) 4.2 (0.165) 1.27 (0.050) DocID13397 Rev 5 8 0.004 Figure 10. SO-8 footprint measurements in mm (inches) 8/10 Max. LCP1531 4 Ordering information Ordering information Table 9. Ordering information 5 Order code Marking Package Weight Base qty Delivery mode LCP1531RL CP153 SO-8 0.08 g 2500 Tape and reel Revision history Table 10. Document revision history Date Revision Changes 23-Mar-2007 1 First issue. 10-Apr-2008 2 Reformatted for current standards. Changed gate capacitance from 220 nF to 100 nF. 10-Aug-2011 3 Updated standards in Table 1. 23-Feb-2012 4 Standardized nomenclature for Gn. 27-Aug-2013 5 Updated Table 1, Table 3, Figure 9 and Figure 10. 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