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器件3D模型￥ 53.695
TLC5947RHBTG4 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
LED驱动器
封装:
VQFN-32
描述:
24通道，12位PWM LED驱动器，内部振荡器 24-Channel, 12-Bit PWM LED Driver with Internal Oscillator
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P3P4Hot
典型应用电路图在P18
原理图在P11P12P20
封装尺寸在P23P25P26
标记信息在P23P24
封装信息在P22P23P24P25P26
技术参数、封装参数在P4
应用领域在P1P33
电气规格在P6
导航目录
TLC5947RHBTG4数据手册
Page:
of 33 Go
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GND
BLANK
OUT23
OUT22
OUT21
OUT20
OUT19
OUT18
OUT17
OUT16
OUT15
OUT14
OUT13
OUT12
SCLK
SIN
VCC
IREF
XLAT
SOUT
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
1
2
6
8
10
12
13
15
16
3
4
5
7
9
11
14
32
31
27
25
23
21
20
18
17
30
29
28
26
24
22
19
GND
VCC
Thermal
Pad
GND
Via to
Heatsink
Layer
SIN
XLAT
SCLK
BLANK
TLC5947
SBVS114B –JULY 2008–REVISED JANUARY 2015
www.ti.com
10 Power Supply Recommendations
The VCC power supply voltage should be decoupled by placing a 0.1-µF ceramic capacitor close to the VCC pin
and GND plane. Depending on the panel size, several electrolytic capacitors must be placed on the board
equally distributed to get a well regulated LED supply voltage (V
LED
). The V
LED
voltage ripple must be less than
5% of its nominal value. Furthermore, the V
LED
must be set to the voltage calculated by Equation 3:
V
LED
> V
F
+ 0.4 V (10-mA constant-current example)
where
• V
F
= maximum forward voltage of all LEDs. (3)
11 Layout
11.1 Layout Guidelines
• Place the decoupling capacitor near the VCC pin and GND plane.
• Place the current programming resistor R
IREF
close to the IREF pin and the IREFGND pin.
• Route the GND pattern as widely as possible for large GND currents.
• The routing wire between the LED cathode side and the device OUTXn pin must be as short and straight as
possible to reduce wire inductance.
• When several ICs are chained, symmetric placements are recommended.
11.2 Layout Example
Figure 26. Layout Schematic
20 Submit Documentation Feedback Copyright © 2008–2015, Texas Instruments Incorporated
Product Folder Links: TLC5947
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