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LM3537 bảng dữ liệu(PDF) 2 Page - Texas Instruments

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tên linh kiện LM3537
Giải thích chi tiết về linh kiện  8-Channel WLED Driver with Four Integrated LDOs
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Trang chủ  http://www.ti.com
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LM3537 bảng dữ liệu(HTML) 2 Page - Texas Instruments

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5
4
3
2
1
A
B
C
D
E
F
LDO1
LDO2
VOUT
VIN_A
ALS
C2-
D7/
INT
D6
LDO3
GND
SDA
D8
C1-
D5
PWM
D1
D4
HWEN
SCL
D3
D2
PGND
LDO4
C2+
C1+
SBIAS
GPO1
GPO2
VIN_B
VIN_C
LM3537
SNVS634B – JUNE 2011 – REVISED MAY 2013
www.ti.com
DESCRIPTION (CONTINUED)
I2C-compatible control allows full configurability of the backlighting function. The LM3537 provides multi-zone
Ambient Light Sensing allowing autonomous backlight intensity control in the event of changing ambient light
conditions. A PWM input is also provided to give the user a means to adjust the backlight intensity dynamically
based upon the content of the display.
Four integrated LDOs are fully configurable through I2C capable of addressing point-of-load regulation needs for
functions such as integrated camera modules. The LDOs can be powered from main battery source, or by a fixed
output voltage of an external buck converter (post regulation) leading to higher conversion efficiency.
The LM3537 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain
of 3/2 or in Pass Mode. The proper gain for maintaining current regulation is chosen, based on LED forward
voltage, so that efficiency is maximized over the input voltage range.
LM3537 is offered in a tiny 30-bump DSBGA package.
Connection Diagram
Figure 1. 30–Bump DSBGA Package
Top View
2
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