VIPER100A datasheet(15/23 Pages) STMICROELECTRONICS

15 / 23 page

15/23

VIPer100/SP - VIPer100A/ASP

COMP pin

in order to limit the primary peak

current of the device to a value:

where:

The suggested value for R1+R2 is in the range of

220K

Ω.

OVER-TEMPERATURE PROTECTION:

Over-temperature protection is based on chip

temperature

sensing.

The

minimum junction

temperature at which over-temperature cut-out

occurs is 140ºC while the typical value is 170ºC.

The device is automatically restarted when the

junction temperature decreases to the restart

temperature threshold that is typically 40ºC below

the shutdown value (see figure 8).

DPEAK

COMP

0.5

–

-------------------------------------

COMP

0.6

----------------------

Figure 18: Typical Compensation Network

Figure 20: External Clock Sinchronisation

Figure 19: Slope Compensation

Figure 21: Current Limitation Circuit Example

13V

OSC

COMP

SOURCE

DRAIN

VDD

VIPER100

FC00121

F C 00141

13 V

OSC

COM P

S O URCE

DRAIN

VD D

VIPER 1 00

R 3

13V

OSC

COMP

SOURCE

DRAIN

VDD

VIPER100

10 k

Ω

FC00220

13 V

OS C

CO M P

S O URC E

DRAIN

VD D

V IPER 1 0 0

F C 00 24 0

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