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UM0670 bảng dữ liệu(PDF) 38 Page - STMicroelectronics

tên linh kiện UM0670
Giải thích chi tiết về linh kiện  80 W offline LED driver with PFC
PDF  43 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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UM0670 bảng dữ liệu(HTML) 38 Page - STMicroelectronics

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UM0670
Design calculation
Doc ID 15327 Rev 2
38/43
Resistor R202 limits the charging current and should be in the following range:
Equation 4
Equation 5
Equation 6
A 1 k
Ω resistor is chosen for R202.
Capacitor C203 should be lower than 1.25 nF, and therefore a value of 220 pF was chosen:
Equation 7
C203 = 220 pF
Inductor size is calculated using following equation:
Equation 8
Two sense resistors are connected in parallel and their size is calculated:
Equation 9
The output LED current of 1 A was precisely set by adjusting resistors R204 and R206, and
therefore their optimal resistance values are 1.5
Ω and 2.2 Ω.
R204 = 1.5 Ω
R206 = 2.2 Ω
In the next step the power MOSFET and its heat sink are calculated. The power MOSFET
RMS current is derived using the following equation:
V
GD M AX
V
ZCD C LAMP
V
F
–
–
I
ZCD M AX
V
ZCD C LAMP
R
203
-----------------------------------
+
-------------------------------------------------------------------------------
R
202
R
203
V
GD M IN
V
–
ZCD C LAMP
V
F
–
V
ZCD CL AM P
------------------------------------------------------------------------------
⎝⎠
⎜⎟
⎛⎞
×
<<
15
5.7
–
0.7
–
0.01
5.7
3900
-------------
⎝⎠
⎛⎞
+
-------------------------------------
R
202
3900
9.8
5.7
–
0.7
–
5.7
-------------------------------------
⎝⎠
⎛⎞
×
<<
750
R
202
2326
<<
C
203
C
204
C
206
||
()
V
ZCD CL AM P
V
GD CMAX
V
ZCD CL AM P
–
V
F
–
()
----------------------------------------------------------------------------------------
1.89
10
9
–
5.7
15
5.7
–
0.7
–
-----------------------------------
×
1.25 nF
==
<
L
V
LED
t
OFF
×
2I
MAX
I
AVR
–
()
×
----------------------------------------------
80
16
10
6
–
×
×
21.4
1
–
()
×
---------------------------------------
1.6mH
==
=
R
204
R
206
V
CS
I
MAX
------------
1.08
1.04
-----------
0.77
Ω
==
=
||



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