TPS40056

SLVS612 − APRIL 2006

10

www.ti.com

APPLICATION INFORMATION

Stepping the load from a heavy load to a light load results in an output overshoot. Excess energy stored in the

inductor must be absorbed by the output capacitance. The energy stored in the inductor is described in

equation (5).

E

1

2

L

where:

+ I

OH

2

* I

OL

2

(Amperes)

2

where:

Energy in the capacitor is described in equation (7).

E

1

2

C

where:

+ V

f

2

* V

i

2

where:

Substituting equation (6) into equation (5), then substituting equation (8) into equation (7), then setting equation

C

L

I

OH

2

* I

OL

2

V

f

2

* V

i

2

(Farads)

(5)

(6)

(7)

(8)

(9)