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)： 31/64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 37
5.3.2
Low-Cost LED Current Control with Non-isolated Output
One can have a cost effective design by not having the operational amplifier in the output current
feedback loop. The circuit is shown in Figure 20.
Figure 20: Low-cost, Non-isolated LED Current Control
In this case, the voltage across Rsen2 is directly connected to VFB pin through the filter R3 and CCP
and the diode D2 but without the operational amplifier U2. Also it should be noted that Rsen2 has to
be selected so that the voltage across it is higher than 2.5V (by a diode drop) under steady state
conditions. Because of this condition, Rsen2 will be of a higher value than when the operational
amplifier is present and there will be a significant power loss in the Rsen2 resistor. The efficiency of
this LED driver circuit will be lower than that of application circuit in Figure 19, Non-Isolated
The following equation can be used for the design of R3 in addition to equation 7.
Equation (10)
Where, IAVG is the average LED current, VD2 is the voltage drop on the diode D2, VREF is the
internal reference of the 88EM8080/88EM8081 IC, and resistors R3 and R4 are in k.
FB
88EM8080/81
VOUT
CO2
Rsen2
R1
R2
D1
D2
R 3
Cfb
Ccp
LEDs
Np
NS2
DR2
Ri = 200k
U3
R4
I
AVG
R
sen2
×
() V
D2
–
V
REF 1
R
3
R
4
------
R
3
200
---------
++
=
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