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参数资料
| 型号： | SC442ULTRT |
| 厂商： | Semtech |
| 文件页数： | 1/1页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR CONST CURRENT 28MLPQ |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 10 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 640kHz ~ 960kHz |
| 电源电压： | 4.5 V ~ 21 V |
| 输出电压： | 42V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-UFQFN 裸露焊盘 |
| 供应商设备封装： | 28-UMLP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | SC442ULTRTDKR |
SC442
POWER MANAGEMENT
Features
10-Channel, Integrated, High Efficiency
120 White LED Driver
Description
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Wide input voltage range from 4.5V to 21V
42V maximum operating output voltage
Programmable LED current up to 30mA per string
+/- 1% current matching
Integrated 3A switch
Low current sink voltage
Up to 91% efficiency
Flexible LED configurations
Mismatched LED channels
Disable individual channel(s)
Parallel channels for high LED current
PWM dimming capability
Up to 50kHz dimming frequency
>500:1 dimming range
Switching frequency: 500kHz - 1MHz
Parallel device operation with Sync Pin
Protection features:
Adjustable OVP
Cycle-by-cycle current limit
LED short channel with disable /Open channnel
Over-Temperature protection
MLPQ-28 lead-free package (WEEE and RoHS compliant),
The SC442 is a 10-channel, high efficiency integrated step-up
(boost) driver IC capable of powering up to 120 WLEDs. The device
has a wide input voltage of 4.5V to 21V with no internal regulator
or bypass capacitor required. The wide input range, up to 42V
output voltage and flexible implementation make it the ideal LED
backlight driver solution for medium to large LCD displays. The
current sink channels are programmed with an external resistor
up to 30mA each.
Channel-channel current matching is +/-1% . The device disables
open or shorted LEDs by disabling only the affected LED channel;
thus increasing LCD panel life. Channel-channel LED mismatch
voltage is accomodated by adjusting the SCPSET resistor. The
current sink channels may be operated in parallel for increased
LED current. Unused channels are be disabled by connecting the
pin to the input voltage.
Losses in the switching device and current sinks are minimized
across the operating range; yielding >90% efficiency and excel-
lent battery life for portable systems.
The device accepts PWM dimming up to 50kHz. Maximum dim-
ming range is greater than 500:1 with excellent linearity for opti-
mum PWM dimming characteristics. The high frequency dimming
capability (>20kHz) eliminates audio emissions and allows small
ceramic output capacitors.
4×4mm × 0.6mm
Applications
? Automotive LCD Backlighting
? Desktop monitors
? Notebook PCs
? Portable TVs
Typical Application Circuit
Switching frequency is programmable from 200kHz to 1MHz;
allowing efficiency versus L/C sizing tradeoffs across the input/
output voltage range. Alternatively, the SYNC pin allows the
designer to synchronize the switching frequency to an external
system clock and, if necessary, a parallel SC442 device - eliminating
potential system intermodulation and interference problems.
Over-temperature shutdown protects the IC from over-heating
under abnormal conditions. The device is available in a small
4mmx4mm MLPQ-28 pin package with 0.6mm maximum height
and is fully WEEE and RoHS compliant.
VIN = 4.5V– 21V
6.8uH
VOUT = Up to 42V
SW
VIN
SW
VOUT
1.47k
12nF
SYNC
OVFB
COMP
Enable
Dimming
SCPEN
47nF
SS
FS
EN
PWM
SCPEN
AGND
IO1- 10
IOSET
SCPSET
IOGND
AGND
PGND
10
Up to 120WLEDs
March 26, 2010
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC443 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Efficiency Integrated Boost Driver for 3-Strings of 30mA LEDs |
| SC4431 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Shunt Regulator With Open Collector Output |
| SC4431_03 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Shunt Regulator With Open Collector Output |
| SC4431CSK-.5TRT | 制造商:Semtech Corporation 功能描述: 制造商:Semtech Corporation 功能描述:Voltage Regulator IC |
| SC4431CSK-0.5.TRT | 制造商:Semtech Corporation 功能描述: |
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