SM16706FN 데이터 시트보기 (PDF) - Samhop Mircroelectronics

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SM16706FN

16-BIT CONSTANT CURRENT LED DRIVER

Samhop Mircroelectronics 

SAMHOP Microelectronics Corp. SM16706P/SP/F/FN

16-BIT CONSTANT CURRENT LED DRIVER

[1] Output Current (IOUT)

IOUT is set by the enternal resistor (R-EXT) as shown in Figure1.

[2] Total supply voltage (VLED)

This device can operate at 0.4~0.7V (VOUT). When a higher voltage is input to the device, the excess

voltage is consumed inside the device, that leads to more power dissipation.

In order to minimize power dissipation and loss, we would like to recommend to set the total supply voltage

as shown below,

VLED (total supply voltage)=VOUT (IC Supply Voltage)+ Vf (LED Forward voltage)

+ VDS (MOSFET Voltage Drop)

When the total supply is too high considering the power dissipation of this device, an additional R can

decrease the OUT voltage (VOUT).

PATTERN LAYOUT

VDD

SCAN

CPU

VDD

ENABLE

CLOCK

LATCH

SERIAL-IN

R-EXT

VDD

OUT0

VOUT

OUT15

GND SERIAL-OUT

VLED = 3 ~ 4 (V)

SDM4952

SDM4953

VDS SDM9435A

Vf

VDD

ENABLE

CLOCK

LATCH

VDD

Vf

OUT0

VOUT

SERIAL-IN

OUT15

R-EXT GND SERIAL-OUT

[3] Pattern Layout

This device has only one ground pin that means signal ground pin and power ground pin are common.

If ground pattern layout contains large inductance and impedance, and the voltage between ground

and LATCH, CLOCK terminals exceeds 2.5V by switching noise during operation, this device may miss-

operate. So we would advise you to pay attention to pattern layout to minimize ground inductance.

Page 11

V.2.0 MAY,2003

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