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參數(shù)資料
| 型號： | 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)： | 50/64頁 |
| 文件大?。?/td> | 667K |
| 代理商： | 88EM8081XX-SAG2C000-T |
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88EM8080/88EM8081
Datasheet
Doc. No. MV-S106340-01 Rev. B
Copyright 2010 Marvell
Page 54
Document Classification: Proprietary
August 6, 2010, Preliminary Information
5.7.2
Non-isolated LED Driver Description
This is a single stage non-isolated flyback LED driver with output regulation and PFC. The AC input
is rectified by the diodes D2,D5,D6 and D7. 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 R5 and
R14 provide the necessary voltage at VIN pin for AC Input voltage sensing. Transformer 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 R15. Diode D4, Resistor R10 and capacitor C2 form the
primary RCD clamp. Resistor R7 senses the primary current and provides the input to ISNS pin.
Diode D3 is the flyback diode and capacitors C1 and C14 are the output capacitors. Resistor R4
provides the initial bias for the PFC controller from the rectified AC input. Auxiliary winding T1B
provides the bias power after startup. Maximum output voltage protection is provided by resistors
R16 and R17. The LED current is sensed as the voltage across the resistor R20. The sensed output
voltage from the resistor divider network R16 and R17 and the voltage across resistor R20 are both
or’ed through the D12 dual diode. The output of D12 is connected to FB pin. C13 is a decoupling
capacitor. Zeners D9 and D1 are used for protection.
The key points for this design are:
Output -- 27.5VDC at 450mA
Universal Input – 90V to 264 VAC
Dual diode for maximum output voltage protection and for sensing the LED current
Small size, low cost
Maximum over voltage protection at 31VDC (typical)
No optocoupler and no external operational amplifier
High power factor and low THD throughout the AC line, load and temperature ranges
No external compensation
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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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