LCDP1521 Dual-line programmable transient voltage suppressor for SLIC protection Features dual-line programmable transient voltage suppressor wide negative firing voltage range VMGL = -150 V max. low dynamic switching voltages: VFP and VDGL low gate triggering current: IGT = 5 mA max. peak pulse current: IPP = 20 A (10/1000 s) holding current: IH = 150 mA min. SO-8 Benefits A TrisilTM is not subject to ageing and provides a fail safe mode in short circuit for better protection. Trisils are used to help equipment meet various standards such as UL1950, IEC 950 / CSA C22.2, UL1459 and FCC part68. Trisils have UL94 V0 approved resin. Trisils are UL497B approved (file: E136224). Figure 1. TIP 1 1 Functional diagram 8 RING 1 GATE 2 7 GND GATE 3 6 GND TIP 2 4 5 RING 2 Description This device has been designed to protect 2 new high voltage, as well as classical SLICs against transient overvoltages. Positive overvoltages are clamped by 2 diodes. Negative surges are suppressed by 2 thyristors, their breakdown voltage being referenced to -VBAT through the gate. This component presents a very low gate triggering current (IGT) to reduce the current consumption on printed circuit boards during the firing phase. TM: Trisil is a trademark of STMicroelectronics October 2010 Doc ID 8627 Rev 4 1/12 www.st.com 12 Compliant with the following standards LCDP1521 1 Compliant with the following standards Table 1. Compliant with the following standards 2/12 Required peak current Current waveform Minimum serial resistor to meet standard () 500 100 2/10 s 10/1000 s 31 40 2/10 s 500 2/10 s 62 1500 2/10 s 100 2/10 s 7 ITU-T-K20/K21 6000 1500 10/700 s 150 37.5 5/310 s 200 20 ITU-T-K20 (IEC 61000-4-2) 8000 15000 1/60 ns VDE0433 4000 2000 10/700 s 100 50 5/310 s 120 40 VDE0878 4000 2000 1.2/50 s 100 50 1/20 s 27 0 IEC 61000-4-5 4000 4000 10/700 s 1.2/50 s 100 100 5/310 s 8/20 s 120 27 FCC Part 68, lightning surge type A 1500 800 10/160 s 10/560 s 200 100 10/160 s 10/560 s 43 32 FCC Part 68, lightning surge type B 1000 9/720 s 25 5/320 s 0 Peak surge voltage (V) Voltage waveform GR-1089 Core First level 2500 1000 2/10 s 10/1000 s GR-1089 Core Second level 5000 GR-1089 Core Intra-building Standard Doc ID 8627 Rev 4 (A) ESD contact discharge ESD air discharge 0 0 LCDP1521 Characteristics 2 Characteristics Table 2. Thermal resistance Symbol Parameter Value Unit Rth (j-a) Junction to ambient 170 C/W Figure 2. Electrical characteristics (Tamb = 25 C) I Symbol IGT IH IRM IRG VRM VGT VF VFP VDGL VGATE VRG C Parameter Gate triggering current Holding current Reverse leakage current line / GND Reverse leakage current gate / line Reverse voltage line / GND Gate triggering voltage Forward drop voltage line / GND Peak forward voltage line / GND Dynamic switching voltage gate / Line Gate / Gnd voltage Reverse voltage gate / Line Capacitance line / GND VR VRM VF V IRM IR IH IPP Table 3. Absolute ratings (Tamb = 25 C, unless otherwise specified) Symbol Value Unit 10/1000 s 8/20 s 10/560 s 5/310 s 10/160 s 1/20 s 2/10 s 20 60 20 25 30 60 70 A Non repetitive surge peak on-state current (50 Hz sinusoidal) t = 10 ms t=1s 5 3.5 A I2t value for fusing (50 Hz sinusoidal) t = 10 ms 0.125 A2s IGSM Maximum gate current (50 Hz sinusoidal) t = 10 ms 2 A VMLG VMGL Maximum voltage LINE/GND Maximum voltage GATE/LINE -40 C < Tamb < +85 C -40 C < Tamb < +85 C -150 -150 V Tstg Tj Storage temperature range Maximum junction temperature - 55 to + 150 150 C 260 C IPP ITSM I2t TL Parameter Peak pulse current(1) Maximum lead temperature for soldering during 10 s 1. For pulse waveform see Figure 3. Doc ID 8627 Rev 4 3/12 Characteristics Figure 3. LCDP1521 Repetitive peak pulse current % IPP tr : rise time (s) tp: pulse duration (s) ex: Pulse waveform 10/1000 s tr = 10 s tp = 1000 s 100 50 0 t tr Table 4. Parameters related to the diode line / GND (Tamb = 25 C) Symbol Test conditions VF VFP(1) tp IF = 1 A 10/700 s 1.2/50 s 2/10 s Max Unit 2 V 5 10 20 V t = 500 s RS = 110 RS = 60 RS = 245 1.5 kV 1.5 kV 2.5 kV IPP = 10 A IPP = 15 A IPP = 10 A 1. See Figure 5: Test circuit for VFP and VDGL parameters. RS is the protection resistor located on the line card. Table 5. Parameters related to the protection thyristor (Tamb = 25C unless otherwise specified) Symbol Test conditions Min Max Unit 5 mA IGT VGND / LINE = -48 V 0.1 IH VGATE = -48 V(1) 150 VGT At IGT IRG VRG = -150 V VRG = -150 V mA 2.5 V Tc = 25 C Tc = 85 C 5 50 A IPP = 10 A IPP = 15 A IPP = 10 A 5 10 20 V VGATE = -48 V(2) VDGL 10/700 s 1.2/50 s 2/10 s 1.5 kV 1.5 kV 2.5 kV RS = 110 RS = 60 RS = 245 1. See Figure 4: Functional holding current (IH) test circuit: go no-go test 2. See Figure 5: Test circuit for VFP and VDGL parameters. The oscillations with a time duration lower than 50 ns are not taken into account Table 6. Symbol IRM C 4/12 Parameters related to diode and protection thyristor (Tamb = 25 C, unless otherwise specified) Test conditions VGATE / LINE = -1 V VGATE / LINE = -1 V Typ. VRM = -150 V VRM = -150 V Tc = 25 C Tc = 85 C VR = 50 V bias, VRMS = 1 V, F = 1 MHz VR = 2 V bias, VRMS = 1 V, F = 1 MHz Doc ID 8627 Rev 4 20 48 Max. Unit 5 50 A pF LCDP1521 Test circuits 3 Test circuits 3.1 Functional holding current (IH): go no-go test Figure 4. Functional holding current (IH) test circuit: go no-go test R Surge generator VBAT = -100 V D.U.T This is a go no-go test, which confirms the holding current (IH) level in a functional test circuit. 3.1.1 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 = 10 A, 10/1000 s. The D.U.T. will come back to the off-state within a duration of 50 ms max. 3.2 Test circuit for VFP and VDGL parameters Figure 5. Test circuit for VFP and VDGL parameters R4 (VP is defined in unloaded condition) TIP L R2 RING R3 VP C1 R1 C2 GND Doc ID 8627 Rev 4 5/12 Technical information Table 7. 4 LCDP1521 Test circuit component values Pulse (s) Vp C1 C2 L R1 R2 R3 R4 IPP Rs tr tp (V) (F) (nF) (H) () () () () (A) () 10 700 1500 20 200 0 50 15 25 25 10 110 1.2 50 1500 1 33 0 76 13 25 25 15 60 2 10 2500 10 0 1.1 1.3 0 3 3 10 245 Technical information Figure 6. LCDP1521 concept behavior Rs1 L1 TIP IG T1 Th1 D1 Gate -Vbat V Tip ID1 GND GND C Rs2 RING VRing L2 Figure 6 shows the classic protection circuit using the LCDP1521 crowbar concept. This topology has been developed to protect the new high voltage SLICs. This supports the programming of 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. The capacitor C is used to speed up the crowbar structure firing during the fast surge edges. This minimizes 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 to the LCDP1521 Gate pin and to the reference ground track (or plan). The optimized value for C is 220 nF. The series resistors Rs1 and Rs2 in Figure 6 represent the fuse resistors or the PTC which are mandatory to withstand the power contact or the power induction tests imposed by the 6/12 Doc ID 8627 Rev 4 LCDP1521 Technical information various country standards. Taking into account this fact, the actual lightning surge current flowing through the LCDP is equal to: Isurge = Vsurge / (Rg + Rs) With: Vsurge = peak surge voltage imposed by the standard. Rg = series resistor of the surge generator Rs = series resistor of the line card (equivalent to PTC + R in Figure 7) Example: For a line card with 60 of series resistors, which has to be qualified under GR-1089 Core 1000 V, 10/1000s surge, the actual current through the LCDP1521 is equal to: Isurge = 1000 / (10 + 60) = 14 A The LCDP1521 is particularly optimized for the new telecom applications such as the fiber in the loop, the WLL, and the remote central office. In this case the operating voltages are smaller than in the classic system. This makes the high voltage SLICs particularly suitable. The schematics of Figure 7 show the topologies most frequently used for these applications. Figure 7. Protection of high voltage SLICs -Vbat PTC or Fuse Ring relay 1 R Line 1 LC D Pxxxx TIP SLIC 1 R PTC or Fuse RING R Ring relay 2 PTC or Fuse Line 2 SLIC 2 R PTC or Fuse Doc ID 8627 Rev 4 7/12 Technical information Figure 8. LCDP1521 Surge peak current versus overload duration. ITSM(A) 7 F=50Hz Tj initial=25C 6 5 4 3 2 1 t(s) 0 0.01 Figure 9. 0.10 1.00 10.00 100.00 1000.00 Relative variation of holding current versus junction temperature IH ( Tj ) / IH ( Tj=25C ) 1.3 1.2 1.1 1 0.9 0.8 Tj ( C ) 0.7 -40 -30 -20 -10 8/12 0 10 20 Doc ID 8627 Rev 4 30 40 50 60 70 80 90 LCDP1521 5 Ordering information scheme Ordering information scheme Figure 10. Ordering information scheme LCDP 15 2 1 RL Line card dual protection Holding current 15 = 150 mA Version 2 = devices protected Package 1 = SO-8 Packaging Blank = Tube RL = tape and reel Doc ID 8627 Rev 4 9/12 Package information 6 LCDP1521 Package information Epoxy meets UL94, V0 Lead-free package In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. Table 8. SO-8 dimensions Dimensions Ref. Seating Plane C A2 Min. k ppp C A L L1 D 8 5 E1 1 Max. Min. Typ. E 1.75 A1 0.1 Max. A2 1.25 b 0.004 0.28 0.48 0.011 0.019 C 0.17 0.23 0.007 0.009 D 4.80 5.00 0.189 0.193 0.197 0.049 4.90 E 5.80 6.00 6.20 0.228 0.236 0.244 3.80 3.90 4.00 0.150 0.154 0.157 1.27 h 0.25 L 0.40 k 0.050 0.50 0.010 1.27 0.016 1.04 0 ppp 6.8 (0.268) 0.6 (0.024) 4.2 (0.165) 1.27 (0.050) 0.020 0.050 0.041 8 0.10 Figure 11. Footprint, dimensions in mm (inches) Doc ID 8627 Rev 4 0.010 E1 e 4 0.069 0.25 L1 10/12 Typ. Inches h x 45 C A1 e b A Millimeters 0 8 0.004 LCDP1521 7 Ordering Information Ordering Information Table 9. Ordering information Order code Marking Package Weight CDP152 SO-8 0.08 g LCDP1521 (1) LCDP1521RL Base qty Delivery mode 100 Tube 2500 Tape and reel 1. Preferred device 8 Revision history Table 10. Document revision history Date Revision Changes March 2002 1 Initial release. 24-Jun-2005 2 Peak pulse current changed from 15 to 20 A (10/1000 s) 07-Feb-2006 3 Added footnote to ordering information table 20-Oct-2010 4 Updated ECOPACK statement. Updated trademark statement. 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