2004-03-16

Page 16

BSP 742 RI

Figure 3b: Short circuit in on-state

shut down by overtemperature, restart by cooling

Figure 3a: Turn on into short circuit,

shut down by overtemperature, restart by cooling

IN

ST

L

t

I

L( S C r )

I

I

L( S C p)

O u tp u t s h o r t to G N D

t

d( S T )

IN

ST

L

t

I

L(S C r)

I

O u tp u t s h o r t to G N D

no rm a l

ope ra tio n

Figure 5: Undervoltage restart of charge pump

Heating up of the chip may require several milliseconds, depending

on external conditions.

Figure 4: Overtemperature:

Reset if Tj < Tjt

ST

J

t

T

IN

IL