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
文件頁數(shù)： 28/64頁
文件大小： 667K
代理商： 88EM8081XX-SAG2C000-T
88EM8080/88EM8081
Datasheet
Doc. No. MV-S106340-01 Rev. B
Copyright 2010 Marvell
Page 34
Document Classification: Proprietary
August 6, 2010, Preliminary Information
5.2.2
Layout Guidelines
It is recommended that a 0.1nF–10nF capacitor (CC) is connected between VIN and ground for
noise immunity. The layout of Rb, Rc and CC should be kept as close as possible to the VIN pin, as
shown in Figure 18 to reduce noise pickup. Ra should be kept as close as possible to the high
voltage input.
Figure 18: Input Voltage Resistor Divider Layout Guidelines
5.3
Output LED Current Control
The brightness and color of a LED are functions of LED current. A constant current source driver for
LED current therefore helps in control of brightness and color. The LED current is passed through a
current sense resistor and the voltage across the sense resistor is used as a feedback signal for
LED current control. Reference designs are presented in the following sections for isolated and
non-isolated outputs for the control of LED current using Marvell 88EM8080/88EM8081 IC.
FB
OCP
VDD
VIN
ISNS
SW
PGND
SGND
Ra
Rb
Rc
Cc
Keep layout of Rb, Rc and Cc as
close as possible to VIN pin to
keep high noise immunization
88EM8080/81
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