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SM16706 Datasheet(PDF) 11 Page - SamHop Microelectronics Corp.

Part # SM16706
Description  16-BIT CONSTANT CURRENT LED DRIVER
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Manufacturer  SAMHOP [SamHop Microelectronics Corp.]
Direct Link  http://www.samhop.com.tw
Logo SAMHOP - SamHop Microelectronics Corp.

SM16706 Datasheet(HTML) 11 Page - SamHop Microelectronics Corp.

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SM16706P/SP/F/FN
SAMHOP Microelectronics Corp.
16-BIT CONSTANT CURRENT LED DRIVER
Page 11
V.2.0 MAY,2003
[1] Output Current (IOUT)
[2] Total supply voltage (VLED)
IOUT is set by the enternal resistor (R-EXT) as shown in Figure1.
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).
[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.
PATTERN LAYOUT
VLED = 3 ~ 4 (V)
R-EXT
SERIAL-IN
LATCH
CLOCK
ENABLE
OUT0
OUT15
SERIAL-OUT
R-EXT
SERIAL-IN
LATCH
CLOCK
ENABLE
OUT15
GND
SERIAL-OUT
CPU
GND
VDD
OUT0
SCAN
SDM4953
SDM9435A
VDS
VDD
VDD
VDD
VDD
VOUT
VOUT
Vf
Vf
SDM4952


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