Need to increase current for DC-DC Converter

[engshahrul]

Hi,
I'm use **broken link removed**.
I use input 3V from battery and use 5V at output.

The problem is, my circuit use 5V, >100mA but the device only can supply up to 100mA. I tried to boost current, same as boost current for voltage regulator 78XX using TIP2955, but it fail produce 5V output.

Anyone know how to solve this?

 

[Raza]

This will not boost current, as the transformer used is meant for 100mA only. It is not a Linear Regulator but a DC/DC converter. You are trying implement the linear regulator's procedure on a different type of circuit. You have to select a higher current model converter to get more current.

 

[timchen8992]

This will not boost current, as the transformer used is meant for 100mA only. It is not a Linear Regulator but a DC/DC converter. You are trying implement the linear regulator's procedure on a different type of circuit. You have to select a higher current model converter to get more current.

How about using DC-DC on isolation by a transformer?

 

[Raza]

How about using DC-DC on isolation by a transformer?

What type of transformer?
An iron core or Ferrite core?
An iron core will not work because of High Frequency used in DC/DC converter.
A Ferrite core, YES, this will but to increase current -> A bigger transformer and proper related circuitry.

 

[dv_sa559]

I think you need to use fly-back topology in DC-DC converter and also you can add mosfet and Ferrite transformer to your circuit.