Obsolete

Product(s)

- Obsolete

Product(s)

Obsolete

Product(s)

- Obsolete

Product(s)

APPLICATION NOTE

10/13

2.2. Speech mode

Figures 14 and 15 give the voltage and current behavior during positive and negative 2.5kV, 2/10

µs, 500A

surge tests using a LCP1511D as second stage protection device. The firing threshold values are now

adjusted to GND and to -Vbat (-48V) by the action of the second stage protection which acts as an external

voltage reference.

As shown on these figures, the maximum remaining voltage does not exceed +8.5V for positive surges and

-65V for negative surges.

2/10 µs

GENERATOR

+/- 5 kV

(500 A)

4

TIPL

TIPS

GND

1/2 CLP270M

I

V1

50

I2

SLIC

LCP1511D

-48V

V2

1

Rsense

Rp

Fig. 13: Lightning test in speech mode.

Fig. 14: CLP270M response to a positive surge.

Fig. 15: CLP270M reponse to a negative surge.