Datenblatt-Suchmaschine für elektronische Bauteile |
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TS19450CSRLG Datenblatt(PDF) 8 Page - Taiwan Semiconductor Company, Ltd |
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TS19450CSRLG Datenblatt(HTML) 8 Page - Taiwan Semiconductor Company, Ltd |
8 / 10 page TS19450 Taiwan Semiconductor Document Number: DS_P0000187 8 Version: B15 APPLICATION INFORMATION (CONTINUE) Linear Dimming The Linear Dimming pin is used to control the LED current. There are two cases when it may be necessary to use the Linear Dimming pin. * In some cases, it may not be possible to find the exact value required to obtain the LED current when the R CS internal 250mV is used. In these cases, an external voltage divider from the VDD pin can be connected to the LD pin to obtain a voltage (less than 250mV) corresponding to the desired voltage across RCS. * Linear dimming may be desired to adjust the current level to reduce the intensity of the LEDs. In these cases, an external 0~250mV voltage can be connected to the LD pin to adjust the LED current during operation. To use the internal 250mV, the LD pin can be connected to VDD. Note: Although the LD pin can be pulled to GND, the output current will not go to zero. This is due to the presence of a minimum on-time (which is equal to the sum of the blanking time and the delay to output time) which is about 450ns. This will cause the MOSFET to be on for a minimum of 450ns and thus the LED current when LD = GND will not be zero. This current is also dependent on the input voltage, inductance value, forward voltage of the LEDs and circuit parasitic. To get zero LED current, the PWMD pin has to be used. |
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