Application information

SEA05L

6/12

Doc ID 18462 Rev 1

2

Application information

Figure 3.

Typical application schematic

2.1

Voltage and current control

Voltage control

The voltage loop is controlled via a transconductance operational amplifier, the voltage

Equation 1

Equation 2

Vo

Io

R1

R2

0.1μF

Rsense

V

R

R

R

5

.

2

*

2

2

1

+

=

sense

O

R

V

I

05

.

0

max

=

Out

LD

Vctrl

Isense

+

-

+

-

1.23 V

2.5 V

1

2

5

3

4

6

Vcc

50m V

OSC

GND

LED

AM04986v1

2

2

1

)

(

R

R

R

Vctrl

V

O

+

∗

=

Vctrl

Vctrl

V

R

R

O

)

(

2

1

+

∗

=