UCC2915, UCC3915

15V PROGRAMMABLE HOT SWAP POWER MANAGER

SLUS198C – FEBUARY 2000 - REVISED - JUNE 2001

7

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

For worst-case constant-current load of value just less than the trip limit; COUT(max) can be estimated from:

C

OUT(max) [

I

MAX *

I

LOAD

16.1

103

C

T

V

OUT

Where VOUT is the output voltage.

For a resistive load of value RL, the value of COUT(max) can be estimated from:

C

OUT(max) [

16.1

103

C

T

R

L

n

1

1*

V

OUT

I

MAX

R

L

Long CT times must consider the maximum temperature. Thermal shutdown protection may be the limiting fault

time.

safety recommendations

Although the UCC3915 is designed to provide system protection for all fault conditions, all integrated circuits

can ultimately fail short. For this reason, if the UCC3915 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 UCC3915 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.