This is a simple design circuit for 9V driver analog power supply circuit. This circuit is using LM2622 as main components. This is the figure of the circuit;
In this configuration, the LM2622 is set to operate at 600kHz (it can also operate at 1.3MHz if the FSLCT pin is tied high). The circuit comprising of L1, D1, C3, and the SW pin of the IC operate. The analog output voltage is controlled by the resistor-divider of R1 and R2. The voltage on the FB pin is internally fixed at +1.26V, so in order to have a +9.0V output, resistor values of 51kΩ for R1 and 8.3kΩ for R2 can be used. Voltages other than +9.0V can be generated by changing the ratio of R1 and R2.
[Circuit source: National Semiconductor Notes]
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