External component selection

AN3971

14/28

Doc ID 022119 Rev 2

4.1

Output current regulation

Output current regulation is implemented by the SEA05 current control loop.

The voltage threshold related to the current control is equal to 50 mV.

dissipation (Plim) through it during full load operation.

4.2

Battery voltage control

The voltage loop is controlled via a voltage divider R7, R8 directly inserted on the SPV1020

output voltage.

It is possible to choose their values using the following equations:

and

values must be:

R7 = 2.7 M

Ω ; R8 = 255 kΩ.

R

sense

I

omax

⋅

V

csth

=

R

sense

V

csth

I

omax

--------------

=

P

lim

V

csth

I

omax

⋅

=

V

O

V

csth

R

1

R

2

+

()

R

2

-------------------------

⋅

=

R

1

R

2

V

O

V

ctrl

+

()

V

ctrl

------------------------------

⋅

=