This is the Power Switching Regulator 9V Circuit that is low current power output and It has strong point is the voltage input change from 2.4V to 10V but a constant voltage output 9 Volt. We used the RC4193 Micropower Switching Regulator is the base, easy to use and there are a few parts in circuit. The test battery point for check voltage of batter or input.
The low power switching regulator IC, number: RC4193, that that Contained in a small body of caterpillar 8-pin. It is designed for devices that work with batteries. The DC regulator power supply is built by the 11 normal parts. By has the 5 resistors, 2 capacitors, a diode, a choke coil and IC no.RC4193 and that importance the battery 2.4 volt to 9 volt : 1 set.
How it works
-This power supply has stable output voltage at 9V until battery is worn down to less than 2.4V The circuits is actual as shown below.
-The RC4193 has a reference circuit inside, is controlled by the Ic current and is define from the resistor R1 that connected externally to IC1
– Which R1 is connected between the positive terminal of the battery to pin IC1 (pin 6).
– The ic Current can be changed from 0.5 micro-amperes to 100 micro amps. Without affecting the operation of the IC chip is calculated by the value of R1.
R1 = [(Ub -1.3)/Ic] kilo ohm
Ub is the battery voltage is measured in volts.
Ic is measured in mA.
– In addition to setting the bias current out to outside IC1, then The reference voltage is also used for monitoring the condition of the battery voltage is low. and set threshold value to input of loop regulation inside the IC chip. To compares with feedback voltage Uf (at pin 7)
– Ud is level that show how battery voltage low down? By use the resistor R2 and R5 are connected together to be divider voltage circuit. Which will take voltage drop across R5 sent to pin 1 of IC1, to check level voltage.
-The loop regulation inside IC1 will stop, when feedback voltage is lower than 1.3V and C1 is used be the oscillator frequency generator circuit of Saw tooth waveform.
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