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744066330 データシート(PDF) 9 Page - Union Semiconductor, Inc. |
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744066330 データシート(HTML) 9 Page - Union Semiconductor, Inc. |
9 / 13 page ________________________________________________________________________ http://www.union-ic.com Rev.05 Apr.2016 9/13 UM1360 Applications Information Setting Nominal Average Output Current with External Resistor RS The nominal average output current in the LED(s) is determined by the value of the external current sense resistor (RS) connected between VIN and ISENSE and is given by: IOUTnom=0.1/RS [for RS≥0.1Ω] The table below gives values of nominal average output current for several preferred values of current setting resistor (Rs) in the typical application circuit as shown on page 5. Rs (Ω) Nominal Average Output Current (mA) 0.1 1000 0.13 760 0.15 667 0.3 333 The above values assume that the VSET pin is floating or applied with a voltage higher than 2.5V (must be less than 5V). Note that Rs=0.1Ω is the minimum allowed value of sense resistor under these conditions to maintain switch current below the specified maximum value. It is possible to use different values of Rs if the VSET pin is driven from an external voltage. (See next section). Output Current Adjustment by External DC Control Voltage The VSET pin can be driven by an external DC voltage (VEN), as shown, to adjust the output current to a value below the nominal average value defined by Rs. D1 Rs 0.13Ω L1 68 μH 10 μF C1 VIN (6V-40V) VIN VSET ISENSE LX UM1360 LED 3W The average output current is given by: IOUT=(0.1*VEN)/(2.5*Rs) [for 0.3V<VEN<2.5V] Note that 100% brightness setting corresponds to: (2.5V≤VEN≤5V) Output Current Adjustment by PWM Control A Pulse Width Modulated (PWM) signal with duty cycle PWM can be applied to the VSET pin, as shown below, to adjust the output current to a value below the nominal average value set by resistor Rs: |
同様の部品番号 - 744066330 |
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同様の説明 - 744066330 |
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