justDIY
Active Member
Greetings
I'm looking for recommendations on controller / regulator ICs to build a 1.5 amp (minimum) switch mode buck (or buck-boost) converter.
Application will be a constant current source for 1.4a Luxeon III red-orange stars.
Input voltage 12 to 15vdc
Output voltage 6 to 12vdc
Ouput current 1400mA to 1500mA
the biggest feature I'm looking for is the constant current output of course, but I also need some way to dim the output - pwm input preferablly but regular analog is good to (like 100% or 50% output). also a low 'band gap' or refrence voltage is crucial - idea is to get away from burning power resistors. 250mV or less is ideal
I was looking at the HV9910, but it doesn't seem really suited to handle low-voltage DC to DC conversion... but it has all the nice features I need
I found the MIC4682, and it looks interesting - I'll be ordering some samples soon unless someone's tried one already and it sucks? ... none of my US suppliers carry the chip, which turns me off
I found a few on the Linear.com website, but I'm hesitant to order samples since they cost so much, and none of my US suppliers carry the parts, which is a turn off!
Supplier's I've checked: Digi-key (prefered, they're real close), Mouser, Newark, Jameco
Thanks for any input!
I'm looking for recommendations on controller / regulator ICs to build a 1.5 amp (minimum) switch mode buck (or buck-boost) converter.
Application will be a constant current source for 1.4a Luxeon III red-orange stars.
Input voltage 12 to 15vdc
Output voltage 6 to 12vdc
Ouput current 1400mA to 1500mA
the biggest feature I'm looking for is the constant current output of course, but I also need some way to dim the output - pwm input preferablly but regular analog is good to (like 100% or 50% output). also a low 'band gap' or refrence voltage is crucial - idea is to get away from burning power resistors. 250mV or less is ideal
I was looking at the HV9910, but it doesn't seem really suited to handle low-voltage DC to DC conversion... but it has all the nice features I need
I found the MIC4682, and it looks interesting - I'll be ordering some samples soon unless someone's tried one already and it sucks? ... none of my US suppliers carry the chip, which turns me off
I found a few on the Linear.com website, but I'm hesitant to order samples since they cost so much, and none of my US suppliers carry the parts, which is a turn off!
Supplier's I've checked: Digi-key (prefered, they're real close), Mouser, Newark, Jameco
Thanks for any input!