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SM16706 Datasheet(PDF) 11 Page - SamHop Microelectronics Corp. |
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SM16706 Datasheet(HTML) 11 Page - SamHop Microelectronics Corp. |
11 / 15 page 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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