參數(shù)資料
型號(hào)： 88EM8081XX-SAG2C000-T
廠(chǎng)商： MARVELL SEMICONDUCTOR INC
元件分類(lèi)： 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(yè)數(shù)： 39/64頁(yè)
文件大?。?/td> 667K
代理商： 88EM8081XX-SAG2C000-T
88EM8080/88EM8081
Datasheet
Doc. No. MV-S106340-01 Rev. B
Copyright 2010 Marvell
Page 44
Document Classification: Proprietary
August 6, 2010, Preliminary Information
Equation (28)
R23 can then be calculated from the following equation:
Equation (29)
Marvell provides an Excel spread sheet tool for the required NTC compensation circuit selection to
meet design requirements. The selection of a different value for NTC part, will provide diffent values
for R10 and R23. The Excel spread sheet tool will help calculate variation of VC with temperature.
The designer can then select a suitable NTC value to minimize the variation of VC. Figure 23 shows
the variation of VC with temperature for a 25V, 500mA output design with 33K NTC part. It is evident
that the variation of VC voltage is small when ambient temperature changes from 0C to 120C. This
clearly shows that the NTC compensation circuit can be used effectively to compensate for the
tolerance of the components and also for the wider variation of CTR of the optocoupler. A reference
design for an isolated LED driver is presented in Section 5.8.
Figure 23: The Error Amplifier Output Voltage (VC) vs. Temperature
R
10
BC
–
BC
()
2
F
–
+
2E
------------------------------------------------------------------------
=
R
23
CTR_25
A
---------------------
R
10
R
NTC1_25
×
R
10
R
NTC1_25
+
-------------------------------------
–
=
10
11
12
13
14
15
0
10
2030
4050
60
7080
90
100
110
120
Temperature (°C)
V
o
lt
ag
e
(
V
)
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