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LM3533 bảng dữ liệu(PDF) 11 Page - Texas Instruments

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LM3533 bảng dữ liệu(HTML) 11 Page - Texas Instruments

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High Voltage
Current Sinks
2X
Charge Pump
Reference and
Thermal
Shutdown
Programmable
500-kHz/1-MHz
Switching
Frequency
LVLED4
LVLED5
LVLED1
LVLED2
LVLED3
C-
C+
CP
CPOUT
CIN
Low Voltage
Current Sinks
COUT
OVP
SW
HVLED1
HVLED2
IN
INT
SDA
SCL
I2C-
Compatible
Interface
ALS
VBATT
Programmable Input
1. Internal Low Pass
Filter
2. 128 Internal Gain
Setting Resistors
4 x Programmable
Pattern Generators
Interrupt Output
Enable
Gain Control
(Automatic, 1X, 2X)
Programmable
Overvoltage
Protection
(16V, 24V, 32V, 40V)
LED String
Open/Short
Detection
1-A Current Limit
PWM
Internal Low Pass
Filter
ALS Processing
1. 8-bit ADC
2. Averaging
3. ALS Algorithms
Indicator LED Control
1. 5-bit Full Scale
Current Select
2. 8-bit brightness
adjustment
3. Linear/Exponential
Dimming
4. LED Current
Ramping
Backlight LED Control
1. 5-bit Full Scale
Current Select
2. 8-bit Brightness
Adjustment
3. Linear/Exponential
Dimming
4. LED Current
Ramping
VBATT
CIN
Boost
Converter
LM3533
www.ti.com
SNOSC68C – APRIL 2012 – REVISED SEPTEMBER 2015
7 Detailed Description
7.1 Overview
The LM3533 provides the power for two high-voltage LED strings (up to 40 V at 30 mA each) and 5 low-voltage
LEDs (up to 6 V at 30 mA each). The two high-voltage LED strings are powered from an integrated boost
converter. The five low-voltage LEDs are powered from an integrated 2× 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, an ambient light sensor input (ALS) for
ambient light current control, and 4 programmable pattern generators for RGB and indicator blinking functions on
the low-voltage LEDs.
7.2 Functional Block Diagram
Copyright © 2012–2015, Texas Instruments Incorporated
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Product Folder Links: LM3533



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