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HVLED815PF bảng dữ liệu(PDF) 20 Page - STMicroelectronics

tên linh kiện HVLED815PF
Giải thích chi tiết về linh kiện  Offline LED driver with primary-sensing and high power factor up to 15 W
PDF  36 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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HVLED815PF bảng dữ liệu(HTML) 20 Page - STMicroelectronics

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Device description
HVLED815PF
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Doc ID 023409 Rev 4
4.5
Constant current operation
Figure 16 presents the principle used for controlling the average output current of the
flyback converter.
The voltage of the auxiliary winding is used by the demagnetization block to generate the
control signal for the internal MOSFET switch Q. A resistor R in series with it absorbs a
current equal to VILED/R, where VILED is the voltage developed across the capacitor CLED
capacitor.
The flip-flop's output is high as long as the transformer delivers current on secondary side.
This is shown in
Figure 17.
Figure 16.
Current control principle
Figure 17.
Constant current operation: switching cycle waveforms
AM13566v1
VILED
Icled
CC
S
R
Q
DMG
ILED
Q
R
.
Iref
CLED
DEMAG
LOGIC
Aux
Rf b
Rdmg
From CS pin
To PWM Logic
AM13567v1
IPRIM
t
IREF
ISEC
Q
ICLED
t
t
t
VILED/R
T
TONSEC



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