Converter DC-DC 0.6A 1-5V to 5V

DSC_6985

Official specifications:
DSC_6986



Measurements

This chapter only contains a few of the measurement, click here to see all

Load%20sweep%201V

Saying it works from 1V is a bit optimistic, I only got 30mA out of it before voltage was too low.

Load%20sweep%203V

With 3V input is works better, but far from perfect and I got about 0.4A before voltage dropped too low.

Load%20sweep%204V

With 4V input the voltage is slightly high over most of the range and it can deliver about 0.55A

Voltage%20sweep%200.1A%20input%20current

Voltage%20sweep%200.1A

With a constant 100mA load and slowly reducing voltage I got down to about 2V before the output voltage was too low.

Voltage%20sweep%200.6A

Using the rated 0.6A current is not really possible if it needs to boost the voltage any significant amount.

No%20load%20voltage%20sweep

Input current varies with input voltage, from about 2mA at 5V up to 10mA at 1V.

Load%20test%200.5A

I used 4V input for this load test.

Temp6788

M1: 48.2C, M2: 50.3C, M3: 42.4C, HS1: 53.0C
The diode got a bit warm, but not very much.

noohmVin3.5V

With no load on the output the voltage goes up and down with about 0.6V, that is a lot.

40ohmVin3.5V

Loading the output did not help.

40ohmVin3.5VC

But adding a capacitor fixed it, I used 330uF.

Loadon20ohmVin3.5V

The output voltage do not drop when the load is turned on.

Loadoff20ohmVin3.5V

But the voltage jumps up when load is removed.

Loadoff20ohmVin3.5VC

The 330uF capacitors fixed that.



A closer looks

DSC_6986

The circuit is very simple with a 3 pin chip (U1) that basically does all the switching and control, in addition to this is the inductor and a rectifier diode (D1). For showing that output power is present is a resistor (R1) and a LED (D2).

DSC_6988

DSC_6989 DSC_6991

DSC_6990

DSC_6987

This side only has markings.

DSC_6992



Conclusion

At 2V input (Two AA batteries) the converter can supply about 100mA, with 3V input (LiIon battery) it can supply about 300mA, this is fine for smaller 5V circuits, but there must be a extra capacitor on the output of the converter.
Remember a protection circuit if used with a LiIon battery.