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)： 41/64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 46
Document Classification: Proprietary
August 6, 2010, Preliminary Information
5.4
Current Sensing and Over Current Protection
5.4.1
Current Sensing Through ISNS Pin
The current sensing circuit is illustrated in Figure 24. The voltage drop on the current sense resistor
should be kept very small in order to reduce the power consumption on the sense resistor. In flyback
topology, the drain to source current flows through the transformer primary, MOSFET and current
sense resistor (Rsen). The average current mode control single stage solution uses two signals: the
peak current signal to avoid the transformer saturation including a short circuit condition, and the
average current sense signal to achieve PFC operation. The voltage drop (Vsen) across resistor
(Rsen) represents the flyback peak current signal. The voltage of (VCS), after RCS and CCS low pass
filter, represents the average current signal of the primary side of the flyback converter.
Figure 24: Current Sensing Circuit
FB
Drain
VDD
Np
NS2
DR2
Rsen
VIN
Csen
ISNS
SW
SGND
Ccs
RCS1
Dsn
Rsn
Csn
Q1
Vsen
Vcs
PGND
VOUT
Cin
VDCin
88EM8080/81
RCS2
U3
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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