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LM3633YFQT Datasheet(PDF) 10 Page - Texas Instruments |
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LM3633YFQT Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 59 page  High-Voltage Current Sinks 2X Charge Pump Hardware Enable, Reference and Thermal Shutdown Programmable 500kHz/1MHz Switching Frequency LVLED4 LVLED1 LVLED2 LVLED3 C- C+ CPOUT Low Voltage Current Sinks SW I 2C Compatible Interface 6 x Programmable Pattern Generators Gain Control (Automatic, 1X, 2X) Programmable Overvoltage Protection (16V, 24V, 32V, 40V) LED String Open/Short Detection 1A Current Limit Internal Low Pass Filter Indicator LED Control 1. 5-bit Full-Scale Current Select 2. 8-bit Brightness Adjustment 3. Linear/Exponential Mapping 4, LED Current Ramping Backlight LED Control 1. 5-bit Full-Scale Current Select 2. 11-bit brightness adjustment 3. Linear/Exponential Mapping 4. LED Current Ramping Boost Converter SDA SCL PWM HWEN OVP IN HVLED1 HVLED2 HVLED3 GND LVLED5 LVLED6 LM3633 SNVS867 – JUNE 2014 www.ti.com 7 Detailed Description 7.1 Overview The LM3633 provides the power for three high-voltage LED strings and six low-voltage LEDs. The three high- voltage LED strings are powered from an integrated boost converter. The six low-voltage LEDs are powered from an integrated 2X charge pump. The device is programmable over an I2C-compatible interface. Additional features include a Pulse Width Modulation (PWM) input for content adjustable brightness control and 6 programmable pattern generators for RGB and indicator blinking functions on the low-voltage LEDs. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Control Bank Mapping Control of the LM3633’s current sinks is not done directly, but through the programming of Control Banks. The current sinks are then assigned to the programmed Control Bank. This allows a wide variety of current control possibilities where LEDs can be grouped and controlled via specific Control Banks (see Figure 12 and Figure 17). 10 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: LM3633 |
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