STMicroelectronics HVLED805 Demonstration Board STEVAL-ILL037V1 STEVAL-ILL037V1 数据表
产品代码
STEVAL-ILL037V1
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
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 R sense
.
To PWM Logic
CLED
R dmg
D EMAG
LOGIC
S
R
Q
R
Rfb
Iref
Q1
Aux
+
-
CC
ILED
DMG