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)： 52/64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 56
Document Classification: Proprietary
August 6, 2010, Preliminary Information
5.8.2
Isolated LED Driver Description
This is a single stage isolated flyback LED driver with output regulation and PFC. The AC input is
rectified by the diodes D2,D3,D7 and D8. Fuse F1 is used for AC input over current protection.
Inductor L1 used for EMI filtering and also helps for input surge voltage protection. Resistors R6,
R13 and R16 provide the necessary voltage at VIN pin for AC Input voltage sensing. Transfirmer T1
is the flyback transformer and Mosfet Q1 is the primary switch which is driven by Marvell
88EM8080/81 PFC Controller through a gate resistor R19. Diode D10, Resistors R17,R18 and
capacitor C12 form the primary RCD clamp. Resistor R5 senses the primary current and provides
the input to ISNS pin. Diode D9 is the flyback diode and capacitors C11 and C13 are the output
capacitors. Resistor R9 provides the initial bias for the PFC controller from the rectified AC input. A
secondary winding T1B of transformer T1, resistor R15, diode D4 and capacitor C4 provides the
bias power to VDD pin after starting. Output OVP protection is provided by Zener D6. The LED
current is sensed as the voltage across the resistor R8. This sensed voltage is amplified by U2 and
then used as the input to the error amplifier U1. The optodiode of PC1A opto coupler is connected to
the output of the error amplifier through R23, R10 and the NTC1. The opto transistor of PC1A
optocoupler is connected to VDD and R11. The voltage across the resistor R11 is connected to FB
pin of the controller. Zeners D1, D5 and D6 are used for protection.
The key points for this design are:
Output -- 25VDC at 500 mA
Universal Input – 90V to 264 VAC
High operating temperature range 0 C to 110 C
Innovative NTC compensation circuit for stable operating point of the error amplifier throughout
the temperature range
Small size, low cost
Over voltage protection around 27VDC
High power factor and low THD throughout the AC line, load and temperature ranges
High Efficiency
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
88EM8082A1-SAG2C000 制造商:Marvell 功能描述:?ACTIVE PFC CONTROLLER FOR AC-DC FLYBACK LED APPLICATIONS - Bulk 制造商:Marvell 功能描述:88EM8082 Series - Single-Stage 120 kHz Fly-back AC/DC LED Driver - SOIC-8
88EM8182B0-SAE2C000-AL00 制造商:Marvell 功能描述:?NON-DIMMABLE, TRIAC AC/DC LED DRIVER, 110V/220V, LOW VOLTAG - Trays
88EM8182B0-SAE2C000TAL00 制造商:Marvell 功能描述:?NON-DIMMABLE; TRIAC AC/DC LED DRIVER; 110V/220V; LOW VOLTAG - Tape and Reel 制造商:Marvell 功能描述:88EM8182 Series - Fly-back Non-Dimmable LED Driver 110V/220V - 8-Pin SOIC
88EM8183B0-SAE2C000-AL00 制造商:MARVELL 功能描述:0
88EM8183B0-SAE2C000TAL00 制造商:Marvell 功能描述:?DIMMABLE; TRIAC AC/DC LED DRIVER; 110V/220V; LOW VOLTAGE + - Tape and Reel 制造商:Marvell 功能描述:Marvell 88EM8183 Series 19V Universal Triac Dimmable LED Driver - SOIC-8
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