LCP1521S_06 STMICROELECTRONICS | Alldatasheet

Document overview

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Technical content

1 Characteristics

Table 1. Standards compliance Table 2. Thermal resistances

Table 3. Electrical characteristics (T amb = 25° C) Table 4. Absolute ratings (T amb = 25° C, unless otherwise specified) Table 5. Repetitive peak pulse current

Table 6. Parameters related to the diode LINE / GND (T amb = 25° C)

  1. See test circuit for VFP (Figure 4.): RS is the protection resistor located on the line card.

Table 7. Parameters related to the protection Thyristors (T amb = 25° C, unless

  1. see functional holding current (IH) test circuit
  2. see test circuit for VDG The oscillations with a time duration lower than 50ns are not taken into account.

Table 8. Parameters related to diode and protection Thyristors (Tamb = 25° C,

2 Technical information

Figure 5. LCP152 concept behavior Figure 5. shows the classical protection circuit using the LCP152 crowbar concept. This negative firing threshold while the positive clamping value is fixed at GND. through Th1 becomes less negative than the holding current IH, then Th1 switches off. surge current flows through the ground. Figure 6. Example of PCB layout based on LCP152S protection Figure 6. 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. during fast strikes. Note that this capacitor is generally present around the SLIC - Vbat pin. reference ground track (or plan) (see Figure 6.). The optimized value for C is 220 nF .

3 Package information

Figure 10. Footprint (dimensions in mm) Table 9. SO-8 Dimensions

Figure 11. QFN 3x3 6 Leads Footprint dimensions (in mm) Table 10. QFN 3x3 6 Leads Package dimensions

4 Ordering information

5 Revision history

100 Tube

2/ SO-8 and QFN footprint dimensions added. 17-Feb-2005 3 Table 9 on page 4: correction of typo on capacitance unit. 03-May-2005 4 Table 5 on page 3: I TSM value @ t= 1s from 4 A to 4.5 A. Table 4. SO-8 package dimensions updated in Table 9.