Step_up_voltage_regulator_with_voltage_dependent_oscillator

Published:2009/7/23 22:37:00 Author:Jessie | From:SeekIC

The circuit of Fig. 4-9 offers a compromise between load-current capability and output ripple (increased load current typically causes increased ripple). Component values are tailored to circuit requirements, as described for Fig.4-2, except as follows: Typical component values are: R2= 330 kΩ, Rs=150 kΩ, Cx 100 pF, C2=100 pF. With these values, VTH is 4-1 V and Fo= 24 kHz. If the IC oscillator appears to be destabilized, or if there is excessive low-frequency ripple, look for stray capacitance at pin 7. Also, try a 100-pF to 10-nF capacitor in parallel with R2.



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