AN2053 datasheet(6/15 Pages) STMICROELECTRONICS

6 / 15 page

LCP topology based protection family

AN2053

6/15

Doc ID 10917 Rev 2

LCP topology based protection family

The family of protection systems based on the LCP concept has two kinds of products.

●

The LCP15xx protects lines within the range of GND to - Vbat. The electrical

characteristics given in Figure 5 shows the asymmetry of this protection function. The

Vg threshold voltage is programmed by the negative voltage on the gate pin. This

voltage is within the range of 0 to -175 V for the LCP1521S

Figure 7.

LCP15xx circuit and electrical characteristics

●

The LCPx2-150B1is designed to protect the lines where the normal operating voltage

can be negative as well as positive and located between -Vbat and +Vb. The electrical

characteristics given in Figure 6 show a crowbar adjustable function for both positive

and negative parts of the curve. The knee of the positive part of the curve is

programmed by the voltage on the gate Gp pin while the knee of the negative part is

programmed by the voltage on the gate Gn pin.

Figure 8.

LCPx2 circuit and electrical characteristics

TIP

RING

GND

TIP

RING

GND

Vgn

Vgp

Ih-

Ih+

AN2053 Datasheet(PDF) 6 Page - STMicroelectronics