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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LM3530 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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LM3530 bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
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1 / 4 page  LM3530 PRODUCT BRIEF November 29, 2010 High Efficiency White LED Driver with Programmable Ambient Light Sensing Capability and I2C Compatible Interface General Description The LM3530 current mode boost converter supplies the pow- er and controls the current in up to 11 series white LED’s. The 839mA current limit and 2.7V to 5.5V input voltage range, makes the device a versatile backlight power source ideal for operation in portable applications. The LED current is adjustable from 0 to 29.5mA via an I2C compatible interface. The 127 different current steps and 8 different maximum LED current levels give over 1000 pro- grammable LED current levels. Additionally, PWM brightness control is possible through an external logic level input. Additionally, the device features two Ambient Light Sensor inputs. These are designed to monitor analog output ambient light sensors and provide programmable adjustment of the LED current with changes in ambient light. Each ambient light sensor input has independently programmable internal volt- age setting resistors which can be made high impedance to reduce power during shutdown. The LM3530's 500kHz switching frequency allows for high converter efficiency over a wide output voltage range accommodating from 2 to 11 se- ries LEDs. Finally, the support of Content Adjusted Backlight- ing maximizes battery life while maintaining display image quality. The LM3530 is available in a tiny 12-bump (1.6mm × 1.2mm × 0.425mm) micro SMD package and operates over the -40° C to +85°C temperature range. Notice: This document is not a full datasheet. For more imformation regarding this product, or to order samples, please contact your National Semiconductor sales office or visit http://www.national.com/support/dir.html. Features ■ Drives up to 11 LED’s in series ■ 1000:1 Dimming Ratio ■ 90% Efficieny ■ Programmable Dual Ambient Light Sensor Inputs with internal ALS Voltage Setting Resistors ■ I2C Programmable Logarithmic or Linear Brightness Control ■ External PWM Input for Simple Brightness Adjustment ■ True Shutdown Isolation for LED's and Ambient Light Sensors ■ Internal Soft-Start Limits Inrush Current ■ Wide 2.7V to 5.5V Input Voltage Range ■ 40V Over-Voltage Protection ■ 500 kHz Fixed Frequency Operation ■ 839mA Peak Current Limit ■ Low Profile 12-bump micro SMD Package Applications ■ Smartphone LCD Backlighting ■ Personal Navigation LCD Backlighting ■ 2 to 11 series White LED Backlit Display Power Source LM3530 Layout Example 30086683 © 2010 National Semiconductor Corporation 300866 www.national.com |
Số phần tương tự - LM3530 |
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Mô tả tương tự - LM3530 |
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