參數(shù)資料
型號(hào)： 88EM8081XX-SAG2C000-T
廠商： MARVELL SEMICONDUCTOR INC
元件分類： 穩(wěn)壓器
英文描述： 2 A POWER FACTOR CONTROLLER, 120 kHz SWITCHING FREQ-MAX, PDSO8
封裝： GREEN, SOIC-8
文件頁數(shù)： 38/64頁
文件大?。?/td> 667K
代理商： 88EM8081XX-SAG2C000-T
Design and Applications Information
Output LED Current Control
Copyright 2010 Marvell
Doc. No. MV-S106340-01 Rev. B
August 6, 2010, Preliminary Information
Document Classification: Proprietary
Page 43
5.3.5.1
Design Equations
With NTC compensation circuit, the total equivalent resistance decreases when ambient
temperature increases and will compensate for the variation of the CTR with temperature and
maintain VC at a narrow range. Similar effect takes place when the ambient temperature is
decreased.
The following two equations at 25C and 110C ambient temperature condition are used for
selection of resistors R10 and R23 values.
Equation (19)
Equation (20)
Where, RNTC1_25 and RNTC1_110 are the resistance value of NTC1 at 25C and 110C ambient
temperature. CTR_25 and CTR_110 are the CTR values of optocoupler at 25C and 110C ambient
temperature and VC_25 and VC_110 are the actual output voltages of U1 amplifier at 25C and 110C
ambient temperatures.
In the following, VC is assumed to be constant at 25C and 100C for the selection of resistors R10
and R23. Once the resistors are selected, the variation of VC at 25C and 100C can be calculated.
Equation (21)
Equation (22)
Equation (23)
Equation (24)
Equation (25)
Equation (26)
Equation (27)
R10 can then be calculated from the following equation:
V
O
V
FD
–
V
C_25
–
R
23
R
NTC1_25
R
10
×
R
NTC1_25
R
10
+
-------------------------------------
+
----------------------------------------------------
CTR_25
R
11
V
FB_REF
=
×
V
O
V
FD
–
V
C_110
–
R
23
R
NTC1_110
R
10
×
R
NTC1_110
R
10
+
---------------------------------------
+
------------------------------------------------------
CTR110
R
11
V
FB_REF
=
×
V
C_25
V
C_110
V
C
==
A
V
FB_REF
R
11
V
O
V
FD
–
V
C
–
()
×
-------------------------------------------------------
=
BCTR_110
CTR_110
–
=
CR
NTC1_25
R
NTC1_110
+
=
DR
NTC_25
R
NTC_110
–
=
EB
A
D
×
+
=
F
4
E
×
BR
NTC1_25
×
R
NTC1_110
×
=
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