參數(shù)資料
型號(hào)： 88EM8081XX-SAG2C000-T
廠商： 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)： 43/64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 48
Document Classification: Proprietary
August 6, 2010, Preliminary Information
Figure 25: Current Sensing and Over Current Protection Waveforms
5.4.3
Peak Current and Average Current Relationship
The relationship between the flyback peak and the average current signals is derived in this section.
Figure 25 explains this in detail.
The peak to peak ripple current through the Rsen resistor is given by the following equation.
Equation (31)
The average current sensing signal across Rsen during the MOSFET switching on time is...
Equation (32)
The average current sensing signal during the whole switching cycle can be calculated as
Equation (33)
Leading Edge Current
GND
TON
Power Limit OCP
VCS
VSEN
VCS
avg
VSEN
avg
Switching Period
VSEN
TON
pk
VCS
avg
VSEN
avg
ΔI
ins
V
line
D
×
L
m
f
s
×
----------------------
=
V
sen
avg
V
senpk
ΔI
ins
2
------------
R
sen
×
–
=
V
cs
avg
V
sen
avg
D
×
=
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