LED driver - 12VDC input

Dear Sirs,

I am crazy on LED light source technologies.

I like to know if any DC-DC converter device or circuit that is possible to drive a series of LEDs connected by serial which is driven by 12VDC input converted to below 180VDC and below 100mA or equivalent, is it possible?

For example, I use 45 units of green 5 mm LEDs, all connected by serial, each LED takes 3.5VDC 20mA, which is max 158VDC to drive it. Five paralells of these group of series LEDs makes it 100 mA. Can I do it with a 12VDC battery?

And, I want also dimming to lower the light to 30% at city night environment, can I do it? The input power is a 12VDC battery.

If not, please recommend proper parts or circuit which can perform the similar to what we want. Quantity of series of LED can be variable to lower voltage.

Anyone can help?

Steve

 RE: LED driver - 12VDC input

constant current drivers
PWM
what does this have to do with Keil software?

Erik

 RE: LED driver - 12VDC input

Try this:

http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1042,C1031,C1115,P15692