UCC3918

LOW ONRESISTANCE HOT SWAP POWER MANAGER

SLUS384B – NOVEMBER 1999 – REVISED JUNE 2000

5

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APPLICATION INFORMATION

9

8

5

4

13

12

10

6

7

3

2

1

16

15

14

VIN

VIN

VIN

VOUT

VOUT

VOUT

SHTDWN

FAULT

CT

HEAT SINK GND

PINS

GND

IFAULT

IMAX

R

IMAX

R

IFAULT

C

T

C

SD

R

SD

V

IN

S6

R

L

C

OUT

V

OUT

C

IN

D1

R1

V

IN

UDG–99152

Figure 1. Typical Application

protecting the UCC3918 from voltage transients

current is suddenly interrupted by the UCC3918. It is important to limit the peak of this spike to less than 6 V

to prevent damage to the UCC3918. This voltage spike can be minimized by:

typically less than 1

µF to limit the inrush current.

pin.

estimating maximum load capacitance

For circuit breaker applications, the rate at which the total output capacitance can be charged depends on the

maximum output current available and the nature of the load. For a constant-current current-limited circuit

breaker, the output comes up if the load requires less than the maximum available short-circuit current.

To ensure recovery of a duty-cycle of the current-limited circuit breaker from a short-circuited load condition,

there is a maximum total output capacitance that can be charged for a given unit ON time (fault time). The design