HVLED805

Application information

Doc ID 18077 Rev 1

19/29

Equation 6

Combining (2), (3) (5) and (6):

Equation 7

This formula shows that the average output current does not depend anymore on the input

or the output voltage, neither on transformer inductance values. The external parameters

Figure 15.

Current control principle

SENSE

C

P

R

V

I

=

SENSE

CLED

OUT

R

V

2

n

I

⋅

=

From R sense

.

To PWM Logic

CLED

Rdmg

DEMAG

LOGIC

S

R

Q

R

Rfb

Iref

Q1

Aux

CC

ILED

DMG