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(yè)數(shù)： 36/64頁(yè)
文件大小： 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 41
At OVP condition the error amplifier output voltage increases to VZD6. It is pointed out that the
primary FB pin voltage reaches the OVP threshold VFB_OVP (which is about 3V) when the output
voltage increases to OVP level. This OVP condition can occur with a low output capacitance and
high output ripple.
The steady state output at no load can also be calculated using the following equation which
depends on the normal operation voltage VC of the TL431 error amplifier at nominal full load
condition and VZD6.
Equation (17)
It is important to note that VC varies with temperature and will also vary from unit to unit of the
optocoupler.
The transfer function of TL431 amplifier circuit is:
Equation (18)
Where VOUT_U2 is the output voltage of the amplifier U2 as shown in Figure 21. The values of C1,
R21 and R22 are selected in such a manner that there is enough DC gain for the average current
feedback signal. At the same time there should be enough attenuation at 120Hz so that the second
harmonic ripple voltage from the sensed current signal is attenuated and not amplified. Therefore
the low frequency zero should be placed far below twice the line frequency (<20Hz).
V
O_NOLOAD
V
O
V
ZD6
V
C
–
+
()
=
HS
()
V
C S
()
V
OUT_U2 S
()
-----------------------------
1
sC
1
R
21
×
+
sR
22
×
C
1
×
---------------------------------------
==
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