DM134B Просмотр технического описания (PDF) - Silicon Touch Technology Inc.

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DM134B

16-Bit Constant Current LED Drivers with 3.3v ~ 5v Supply Voltage

Silicon Touch Technology Inc. 

點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

DM134B、DM135B

System Configuration Example

[1] Output current (IOUT)

Sink current is set by the external resistor as shown in the figure of Iout vs. Rext.

[2] LED supply voltage (VLED) setup

VLED = VCE ( Tr Vsat ) + Vf ( LED forward voltage ) + VO ( IC output voltage)

To prevent too much power from dissipating by the higher VLED of the device, an

additional R can be used to reduce the Vout when the outputs consume current is as follows:

SCAN

CPU

R = VLED − VCE − V f − VO (min)

IO (max) * Bit(max)

ENABLE

CLOCK

LATCH

SERIAL-IN

R-EXT GND

OUT0

Vo

OUT15

SERIAL-OUT

VLED = 3~4 (V)

＋

＋

Vf

VCE

—

—

R

ENABLE

CLOCK

LATCH

SERIAL-IN

R-EXT GND

OUT0

OUT15

SERIAL-OUT

Note

This device has only one ground pin shared by signal, output sink current, and power ground. It is

advisable to pattern the ground layout with minimized inductance so that the switching noise induced

by the input signals and the output sink current would not cause chip malfunction. To prevent drivers’

outputs from damaging by overshoot stresses, it is also advisable not to turn off the drivers and scan

transistors simultaneously. For the QFN package, the IC’s thermal pad, which is internally connected to

the bottom side of chip, should be connected to GND. In addition, a good PCB layout pattern of the

thermal pad is required in order to have a better performance in thermal effect.

16-Bit Constant Current LED Drivers

-13-

Version：A.006

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