8

UCC1913

UCC2913

UCC3913

Although the UCC3913 is designed to provide system

protection for all fault conditions, all integrated circuits

can ultimately fail short. For this reason, if the UCC3913

is intended for use in safety critical applications where

UL or some other safety rating is required, a redundant

safety device such as a fuse should be placed in series

with the device. The UCC3913 will prevent the fuse from

blowing for virtually all fault conditions, increasing system

reliability and reducing maintenance cost, in addition to

providing the hot swap benefits of the device.

SAFETY RECOMENDATION

()

R

P

AI

PL

FET avg

MAX

=

•

1

µ

()

R

VSS

mA

Finally, after computing the aforementioned variables,

the minimum timing capacitor can be derived as such:

Current Source Load:

()

()

C

TA R

VSS

V

R

T

START

PL

PL

••

•

+

−

•

362

10

10

µ

Resistive Load:

()

()

C

TA R

VSS

V

I

R

R

R

T

START

PL

MAX

OUT

PL

OU

••

+

−

−

•

•

+

•

331

5

5

3

µ

TOUT

PL

VSS

C

R

••

•

5

APPLICATION INFORMATION (cont.)

UNITRODE CORPORATION

7 CONTINENTAL BLVD. • MERRIMACK, NH 03054

TEL. (603) 424-2410 FAX (603) 424-3460