- 您现在的位置：买卖IC网 > PDF目录20751 > MAX1553ETA+T (Maxim Integrated)IC LED DRIVR WHITE BCKLGT 8-TDFN PDF资料下载
参数资料
| 型号： | MAX1553ETA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/11页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 8-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 40V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
Pin Description
PIN
1
2
3
4
5
6
7
8
—
NAME
GND
V CC
EN
BRT
FB
SS
OV
LX
EP
FUNCTION
Ground
Voltage-Supply Input. 2.7V to 5.5V. The IC is powered from V CC .
Enable Input. Drive high or connect to V CC to enable the IC. Drive EN low for shutdown.
Brightness-Control Input. Either an analog or PWM control signal can be used. The LED current can be
controlled over a 10 to 1 range. The PWM signal must be between 100Hz and 10kHz, and must have an
amplitude greater than 1.72V.
Feedback Input. Connect to the cathode of the LED string and connect a resistor from FB to GND to set the
LED current.
Soft-Start Timing-Control Input. Connect a capacitor from SS to GND to control soft-start timing. See the Soft-
Start section for information on selecting the soft-start capacitor. SS is pulled to ground with an internal 200 ?
switch when EN is low.
Overvoltage Sense. Connect to a resistor-divider from the anode of the LED string to set the overvoltage
threshold. See Figures 1, 2, and 3.
Inductor Connection. Connect to the inductor and diode. LX is high impedance when EN is low.
Exposed Pad. Connect to GND.
R 2 = R 3 x ? OUT ( PEAK ) ? 1 ?
Detailed Description
Control Scheme
The MAX1553/MAX1554 utilize a minimum off-time, cur-
rent-limited control scheme. If the voltage at FB drops
below the regulation threshold, the internal low-side
MOSFET turns on and the inductor current ramps up to
the current limit. Once the current-limit comparator
trips, the low-side MOSFET turns off for the minimum
off-time (250ns). After 250ns, if the voltage at FB is
above the regulation threshold, the low-side MOSFET
stays off. If the voltage at FB is below the regulation
point, the low-side MOSFET turns back on and the
cycle repeats. By using a regulation control scheme
that is not fixed frequency and that can skip pulses, the
MAX1553/MAX1554 operate with very high efficiency.
Soft-Start
Soft-start is provided on the MAX1553/MAX1554 to min-
imize inrush current. The soft-start time is set with an
external capacitor, C3 (Figures 1, 2, and 3). Use the fol-
lowing equation to solve for C3:
Shutdown
The MAX1553/MAX1554 feature a low-current shut-
down feature. When EN is low, the IC turns off, reduc-
ing its supply current to approximately 0.1μA. For
normal operation, drive EN high or connect to V CC .
Overvoltage Protection
The MAX1553/MAX1554 have an adjustable overvoltage-
protection circuit. When the voltage at OV reaches the
overvoltage threshold (1.25V typ), the protection circuitry
prevents the internal MOSFET from switching, allowing
the output voltage to decay.
The peak output voltage in an overvoltage-protection
event is set with a resistor-divider from the output con-
nected to OV (R2 and R3 in Figures 1, 2, and 3). Select
a value for R3 (10k ? is recommended), then solve for
R2 using the following equation:
? V ?
? V OV ?
where V OV is the overvoltage threshold (1.25V typ), and
C 3 =
tSS
2 x 10 5
V OUT(PEAK) is the desired peak output voltage.
where t SS is the soft-start time. A value of 0.1μF pro-
vides a soft-start time of 20ms.
6
_______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1910EUB+ | IC LED DRVR WHITE BCKLGT 10-MSOP |
| EBM08DSEN-S243 | CONN EDGECARD 16POS .156 EYELET |
| ECC13DRTS-S13 | CONN EDGECARD 26POS .100 EXTEND |
| ECC12DRTI-S13 | CONN EDGECARD 24POS .100 EXTEND |
| EBM08DSEH-S243 | CONN EDGECARD 16POS .156 EYELET |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1553EVKIT | 功能描述:LED 照明开发工具 MAX1553 Evaluation Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX1554ETA | 制造商:Maxim Integrated Products 功能描述:SMALLEST, HIGHEST-EFFICIENCY, 40V STEP-UP CON - Bulk 制造商:Rochester Electronics LLC 功能描述: |
| MAX1554ETA+ | 制造商:Maxim Integrated Products 功能描述:LED DRVR 10SEGMENT 3.15V TO 5.5V 8TDFN EP - Rail/Tube |
| MAX1554ETA+T | 功能描述:LED照明驱动器 40V StepUp Converter for 2-10 White LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX1554ETA+TG069 | 制造商:Maxim Integrated Products 功能描述:LED DRVR 10SEGMENT 3.15V TO 5.5V 8TDFN EP - Tape and Reel |
发布紧急采购，3分钟左右您将得到回复。