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HVLED805TR Datenblatt(PDF) 19 Page - STMicroelectronics

Teilenummer HVLED805TR
Bauteilbeschribung  Off-line LED driver with primary-sensing
PDF  29 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

HVLED805TR Datenblatt(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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