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LM3532 Arkusz danych(PDF) 1 Page - Texas Instruments |
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LM3532 Arkusz danych(HTML) 1 Page - Texas Instruments |
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1 / 47 page  VOUT up to 40V VIN IN SW OVP ILED1 ILED2 ILED3 PGND ALS2 ALS1 INT Ambient Light Sensor 1 Ambient Light Sensor 2 VALS VIN HWEN SDA SCL LM3532 COUT CIN L D1 PWM1 PWM2 T0 LM3532 www.ti.com SNVS653D – JULY 2011 – REVISED JUNE 2013 LM3532 High Efficiency White LED Driver with Programmable Ambient Light Sensing Capability and I2C-Compatible Interface Check for Samples: LM3532 1 FEATURES APPLICATIONS 2 • Drives up to 3 Parallel High-Voltage LED • Power Source for White LED Backlit LCD Strings at 40V Each with up to 90% Efficiency Displays • 0.4% Typical Current Matching Between • Programmable Keypad Backlight Strings DESCRIPTION • 256 Level Logarithmic and Linear Brightness The LM3532 is a 500 kHz fixed frequency Control with 14-Bit Equivalent Dimming asynchronous boost converter which provides the • I2C-compatible Interface power for 3 high-voltage, low-side current sinks. The • Direct Read Back of Ambient Light Sensor via device is programmable over an I2C-compatible 8-bit ADC interface and has independent current control for all three channels. The adaptive current regulation • Programmable Dual Ambient Light Sensor method allows for different LED currents in each Inputs with Internal Sensor Gain Selection current sink thus allowing for a wide variety of • Dual External PWM Inputs for LED Brightness backlight + keypad applications. Adjustment The main features of the LM3532 include dual • Independent Current String Brightness Control ambient light sensor inputs each with 32 internal • Programmable LED Current Ramp Rates voltage setting resistors, 8-bit logarithmic and linear • 40V Over-Voltage Protection brightness control, dual external PWM brightness control inputs, and up to 1000:1 dimming ratio with • 1A Typical Current Limit programmable fade in and fade out settings. The LM3532 is available in a 16-bump, 0.4mm pitch thin DSBGA (1.745 mm x 1.845 mm x 0.6 mm). The device operates over a 2.7V to 5.5V input voltage range and the −40°C to +85°C temperature range. Typical Application Circuit 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2011–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
Podobny numer części - LM3532_13 |
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Podobny opis - LM3532_13 |
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