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參數(shù)資料
| 型號： | SC4509WLTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2 |
| 中文描述： | 高度集成的升壓轉(zhuǎn)換器的白色發(fā)光二極管在MPLD患者應(yīng)用W8 - 2X2的 |
| 文件頁數(shù)： | 1/15頁 |
| 文件大?。?/td> | 421K |
| 代理商： | SC4509WLTRT |
POWER MANAGEMENT
Description
The SC4509 is a highly integrated step-up DC/DC convert-
er targeted for white LED backlighting applications. It is
designed to drive up to
fi
ve LEDs with a wide input voltage
range of 2.7 to 10 volts. Designed for 20V output voltage,
the SC4509 operates with a constant 1.2MHz PWM fre-
quency. To optimize ef
fi
ciency, the feedback voltage is set
to only 199mV, minimizing the power loss in the current
setting resistor. The product requires only four external
components (CIN, COUT, L and R
), making it ideal for
applications that require low cost and minimal PCB area.
www.semtech.com
Highly Integrated Step-Up Converter for
White LED Applications in MLPD-W8-2x2
SC4509
1
Features
V
IN
range: 2.7V — 10V
Integrated Schottky diode
81% ef
fi
ciency
Requires only 4 external components
Up to 20V of output voltage
30mA maximum LED current
Open LED protection (OVP)
1.2MHz PWM switching frequency
Low feedback voltage (20OmV typical)
Wide range of PWM dimming
Drives up to 5 LEDs
500mA switch current limit
220nF output capacitor
Available in 2mm x 2mm x 0.75mm MLPD-W8 and
SOT23-6 packages
Packages are fully WEEE and RoHS compliant
Applications
Digital Video Cameras
White LED Backlight Driver
OLED Display Driver
Portable Media Players
GPS Receivers
Cellular Phones
PDAs and Handheld Computers
Typical Application Circuit
March 26, 2007
L1
22
μ
H
R1
LED3
U2
SC4509
S
6
VIN
5
EN/SS
4
G
2
FB
3
V
1
Vin
LED4
LED2
Vo
C2
0.22
μ
F
C1
1
μ
F
EN/SS
LED1
The SC4509 offers current limit and over-voltage protec-
tion (OVP) to safeguard the device under extreme operat-
ing conditions. If the LEDs become disconnected or fail in
an open state condition, OVP circuitry will be activated to
shut down the device. The EN/SS pin allows the device
to be placed in power-down mode, disabling the control
circuitry to reduce input current.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC450ITS | 制造商:Semtech Corporation 功能描述: |
| SC450ITS.TRT | 制造商:SEMTECH 功能描述:I.C. |
| SC450ITS.TRTCUT | 制造商:Semtech Corporation 功能描述: |
| SC450ITSTRT | 制造商:Semtech Corporation 功能描述:DC DC Cntrlr Single-OUT PWM DC to DC Controller 3V to 30V Input 38-Pin TSSOP T/R |
| SC450R1X542 | 制造商:American Power Conversion Corp (APC by Schneider Electric) 功能描述:APC Smart-UPS 制造商:Schneider Electric 功能描述:SMARTUPS SC 450 W/NETWORK MANAGEMENT CARD - Bulk |
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