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HVLED805 Arkusz danych(PDF) 19 Page - STMicroelectronics

Numer części HVLED805
Szczegółowy opis  Off-line LED driver with primary-sensing
PDF  29 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

HVLED805 Arkusz danych(HTML) 19 Page - STMicroelectronics

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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 RSENSE.
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



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