BA6104--the 5 bit LED potentiometer drive integrated basic application circuit

Published:2011/6/9 22:23:00 Author:qqtang | Keyword: potentiometer drive, basic application circuit | From:SeekIC

BA6104--the 5 bit LED potentiometer drive integrated basic application circuitAs the BA6104 input stage is in the PNP compound transistor basic pole input way, so its input impedance is very high. The output stage is emitter follower, so by adjusting the LED external resistor RL in the figure, the LED drive circuit can be changed. The external resistor, which is connected with 7-pin, can change Vref, when 7-pin is released, the Vref is controlled by IC, and its value is close to 1V. If the LED display LEV is required to be lower than 1v, we just link a resistor RD between 7-pin and the ground, then the Vref is reduced, see as the figure.



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