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)： 29/64頁(yè)
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 35
5.3.1
Non-isolated Output LED Current Control
Figure 19 shows a typical configuration for non-isolated output LED current control. LED current is
sensed by the resistor Rsen2. The voltage across Rsen2 is amplified by an amplifier U2. The output of
the operational amplifier is connected to FB pin through a diode D2. A voltage loop is also added for
voltage regulation at no load. The two feedback loops (output voltage and output current) are
implemented in an OR structure through D1 and D2.
During startup, the output voltage increases and must reach certain level before the LED current can
flow. The output voltage is fed back through the resistor divider (R1 and R2) and the diode D1. R1
and R2 are designed to limit the output voltage during startup (with no LED current) and when the
LED string is open.
Figure 19: Non-Isolated Feedback Loop Schematic
FB
88EM8080/81
VOUT
CO2
Rsen2
R1
R2
D1
D2
R3
R 4
R5
Cfb
Ccp
LEDs
Np
NS2
DR2
Ri = 200k
U3
U2
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