Datasheet

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
defining the output current are the transformer ratio n and the sense resistor R
SENSE
.
Figure 15. Current control principle
SENSE
C
P
R
V
I =
SENSE
CLED
OUT
R
V
2
n
I ⋅=
From Rsense
.
To PWM Logic
CLED
Rdmg
DEMAG
LOGIC
S
R
Q
R
Rfb
Iref
Q1
Aux
+
-
CC
ILED
DMG