LCD power supply circuit

LCD power supply circuit

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The following figure’s switching regulator generates a negative voltage by the notebook battery supply. The microprocessor data bus drives a 4-bit DAC( 74HC273 ), which in turn can vary the regulator output between 6.5 to 11.5 V. This arrangement enables a staircase of 16 possible voltages between these limits. The LCD power supply circuit implements the DAC by using the rail-to-rail output-drive capability of a 74 HC-series CMOS gate. A resistor divider network made by the 240-kO resistor, connected to the V filter capacitor as well as the resistors, is referenced to the 5 V supply control (the MAX635 regulator).

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1 Title: LCD power supply circuit
2 Upload by: psu
3 Upload date: February 1, 2012
4 Image link: https://i2.wp.com/powersupply33.com/wp-content/uploads/2012/02/LCD-power-supply-circuit.jpg?fit=797%2C483
5 Location: 2012/02/LCD-power-supply-circuit.jpg
6 Width: 797 px
7 Height: 797 px

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