VIN

dvdt _ min

OUT

LIM

V

T

C

I

=

´

STARTUP

INRUSH

LOAD

I

I

I

(t)

=

+

STARTUP

INRUSH

DISS _ LOAD

P

P

P

=

+

2

VIN

DISS _ LOAD

L

V

1

P

6

R

æ ö

=

´

ç ÷

è ø

TPS2592Ax

TPS2592Bx

SLVSC11A – JUNE 2013 – REVISED JUNE 2013

www.ti.com

Figure 51. Start-up Waveform with Load (2.5W)

Linearizing the parabolic equation and representing as triangle, the average power loss is:

(9)

Total power dissipated in the device during startup is:

(10)

Total current during startup is given by:

(11)

(12)

Power dissipation for a selected start-up time should not exceed the limits shown in below plots as shaded area.

Typical curves for no load and load are shown in Figure 53 and Figure 54.

(NO Load)

(with Load)

18

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