Stepping up DC!

[Electroenthusiast]

I have a 5V supply, i want to get an 5.7V/ 6V out of it!
and i cant use a amplifier because the only voltage i get nearby it is 5V.
Though seems to be something like foolish, thats what i need to do.

Application: Want to charge a mobile rated to 5.7V supply voltage;
if 5V volts does the job, then i want to know whether the above this is possible?
Like if i use a ossilator and again a rectifier?

 

[colin55]

Here's a simple circit to increase 5v to about 7v:

**broken link removed**

 

[Electroenthusiast]

Here's a simple circit to increase 5v to about 7v:

**broken link removed**

but how will it work; i required 5.7/6 V ; what should i do then? IC7806?

 

[qamarbukhari]

Hello, i need to know how to decrease the voltage from 48 Volts DC to 36 Volts DC.

 

[colin55]

How much current are you drawing?

 

[colin55]

but how will it work; i required 5.7/6 V ; what should i do then? IC7806?

If you want an accurate voltage, get an old car-phone-charger. It has a chip that will convert 5v to any voltage you want. Just adjust 1 or 2 resistors. It has a chip and an inductor and will do waht you want. They cost about $3.00

 

[Electroenthusiast]

Hello, i need to know how to decrease the voltage from 48 Volts DC to 36 Volts DC.

a resistor network will do...
A Voltage divider network

 

[Electroenthusiast]

If you want an accurate voltage, get an old car-phone-charger. It has a chip that will convert 5v to any voltage you want. Just adjust 1 or 2 resistors. It has a chip and an inductor and will do waht you want. They cost about $3.00

Ok may i know the chip-IC no. ?

how does the your 555 circuit work; Can i get any link for it

i required 5.7/6 V ;IC7806?

Can't i vary the resistor, capacitor value and get the suitable output?
My ques is: My gadget is to be charged with 5.7V and 500mA
What if i charge with 5.7 and 350 mA/ something with other output current ?

I feel it doesn't affect

Can the charger be charged from 5V supply?

As it is near to 5.7V

 

[colin55]

The IC in the "junk" phone charger is AP34063

www.ic-on-line.cn/IOL/datasheet/ap34063_21593.pdf


www.ic-on-line.cn/IOL/datasheet/ap34063_21593.pdf

 

[qamarbukhari]

a resistor network will do...
A Voltage divider network

Hi, Can you please guide me how to make a Voltage Divider Circuit for 48 Volts DC to 36 Volt DC.

 

[colin55]

A voltage divider network needs to know the current being drawn before you can start determining the resistor values.

 

[qamarbukhari]

A voltage divider network needs to know the current being drawn before you can start determining the resistor values.

The Required Current Value is near about 10-15 Amp DC,

 

[colin55]

With a voltage divider, the current must be FIXED.

 

[qamarbukhari]

Thanks for continous help, please cofirm if we go for 15 AMP DC. and what would be design of circuit to get it down to 36 volt DC from 48 VOLTS.

 

[colin55]

Is this value a CONSTANT value?

Designing a voltage divider is VERY COMPLEX.

 

[Vizier87]

Designing a voltage divider is VERY COMPLEX.

I suppose you're not talking about resistor networks are you? A bit puzzled here, since if it is, I can't see any complexity in that. Sorry for barging in.

 

[Electroenthusiast]

Hi, Can you please guide me how to make a Voltage Divider Circuit for 48 Volts DC to 36 Volt DC.

**broken link removed**

This would be helpful; The Voltage gets divided based on the value of resistors u add.

A voltage divider network needs to know the current being drawn before you can start determining the resistor values.

 

[qamarbukhari]

yes it is a constant value

 

[MikeMl]

qamarbukhari,

A resistive voltage divider is totally unpractical at your current requirements. Even a linear regulator would produce (48-36)*15= 180W of heat. This would require a huge heatsink.

This is a job for a SMPS buck converter with an overall efficiency of ~85% which would reduce the power dissipation to about 30W.

 

[Nigel Goodwin]

Is this value a CONSTANT value?

Designing a voltage divider is VERY COMPLEX.

No, it's absolutely trivial - but impractical in this case.