I want mini size switching regulator,so it input voltage 9V to 3V Step-Down Converter circuit.
The LM2574 series of regulator are monolithic integrated circuits that provide all the active functions for a step down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation. The LM2587 series of regulators are monolithic integrated circuits specifically designed for flyback, step-up (boost), and forward converter applications.
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Click here for the comprehensive LT1073 Specification Sheet which includes many example circuits using this chip.

I use IC 555 ( hot ic Timer) for Squarewave Oscillator to Driver mini Transformer and Diode, Zener Diode to Out DC Voltage. Ill be honest with you, the output is usually high when it’s unloaded but it will drop if it is loaded. Try to connect a dummy load to the output; say for example 5W 220V incandescent bulb, the output should drop (for testing only). Remember, R3 controls the output current; increasing the value decreases the output current. For testing purposes, you replace the output with a higher value to see what will happen to the output.3.

Try to add a large capacitor across the supply battery to minimize spikes that can affect the behavior of you 555 timer IC and can contribute to unstable and very high output.
Try adding large capacitor across the supply to filter or minimize the voltage spike (from the output) that might affect its operation. 25 KHz is nice (no hums) but the trade off is too small capacitor C1, meaning very unstable operation for the IC.

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