LCP1521

® LCP1521 PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION Application Specific Discretes A.S.D.TM FEATURES Dual programmable transient suppressor Wide negative firing voltage range: VMGL = -150 V max. Low dynamic switching voltages: VFP and VDGL Low gate triggering current: IGT = 2 mA max Peak pulse current: IPP = 30 A (10/1000 µs) Holding current: IH = 150 mA SO-8 DESCRIPTION This device has been especially designed to protect new high voltage, as well as classical SLICs, against transient overvoltages. Positive overvoltages are clipped with 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) in order to reduce the current consumption on printed circuit board during the firing phase. A particular attention has been given to the internal wire bonding. The Kelvin method configuration ensures reliable protection, reducing the overvoltage introduced by the parasitic inductances of the wiring L x(dI/dt), especially for very fast transients. FUNCTIONAL DIAGRAM TIP TIP GATE GND NC GND RING RING September 1999 - Ed: 2A 1/9 LCP1521 COMPLIES WITH THE FOLLOWING STANDARDS: ITU-T K20 VDE0433 VDE0878 IEC1000-4-5 FCC Part 68 lightning surge type A FCC Part 68 lightning surge type B BELLCORE: NWT-001089-CORE First level BELLCORE: NWT-001089-CORE Second level Peak Surge Voltage (V) 4000 1000 2000 2000 level 3 level 4 1500 800 ...