AN2456

LCP152xx concept

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LCP152xx concept

Figure 3.

LCP152xx concept behavior

Figure 3 shows the protection circuit using the LCP152xx crowbar concept that can be used

for protection of single battery high voltage SLICs. It’s noteworthy that the schematic does

not show series resistors that would normally be used on wires L1 and L2. This

the negative battery voltage of the SLIC (up to -150 V), while the positive clamping threshold

is at the GND.

Figure 4.

LCP152xx electrical characteristics

It can be seen from the characteristics of the device (shown in Figure 4) that the device

operates asymmetrically.

the LCP152xx is transparent to the application.

For positive surges on either wire (e.g. L1), the diode D1 clamps the surge voltage to its

forward voltage (Vf).

L 1

L 2

Gate

-Vbat

C

T1

TIP

RING

GND

Th1

D1

GND

IG

ID1

V Tip

V Ring

Fuse1

Fuse2

L 1

L 2

Gate

-Vbat

C

T1

TIP

RING

GND

Th1

D1

GND

IG

ID1

V Tip

V Ring

Fuse1

Fuse2

Vf

I

V

Ih

Vg

Vf

I

V

Ih

Vg