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HVLED815PF bảng dữ liệu(PDF) 23 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
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HVLED815PF bảng dữ liệu(HTML) 23 Page - STMicroelectronics

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HVLED815PF
Device description
Doc ID 023409 Rev 4
23/36
Figure 18.
Voltage control principle: internal schematic
4.7
Voltage feed-forward block
The current control structure uses the VCLED voltage to define the output current, according
to equation
6 on Section 4.5. Actually, the constant current comparator will be affected by an
internal propagation delay TD, which will switch off the MOSFET with a peak current than
higher the foreseen value.
This current overshoot will be equal to:
Equation 8
The previous terms introduce a small error on the calculated average output current set-
point, depending on the input voltage.
The HVLED815PF implements a line feed-forward function, which solves the issue by
introducing an input voltage dependent offset on the current sense signal, in order to adjust
the cycle-by-cycle current limitation.
The internal schematic is shown in
Figure 19.
AM13568v1
Rdmg
Aux
Rf b
From CS pin
CV
To PWM Logic
R
C
COMP
DMG
S/H
DEMAG
LOGIC
EA
2.5V



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