manve_13
Junior Member level 1
Hello,
I've designed a system that includes 3 small dc motors, pic18f and an optical drive. When i did fist prototype version i was using a lab style power source and I was using 12V, 5V and 3.3V from that source but in last version it has 12V adapter input and i was converting voltage 12V to 5V and 3.3V with 2 LM78xx voltage regulators.
The problem is voltage regulators are heating up like crazy in 30 seconds. As i've checked it drawn between .7 A to 1.5 A from 12 V source. Then i connected a huge heatsink to the both regulators but I'm sure there should be another way to solve heating problem.
Can you suggest me a good way to convert 12V to 5V and 3.3V, which kind of dc-converter should I choose?
Thank you.
I've designed a system that includes 3 small dc motors, pic18f and an optical drive. When i did fist prototype version i was using a lab style power source and I was using 12V, 5V and 3.3V from that source but in last version it has 12V adapter input and i was converting voltage 12V to 5V and 3.3V with 2 LM78xx voltage regulators.
The problem is voltage regulators are heating up like crazy in 30 seconds. As i've checked it drawn between .7 A to 1.5 A from 12 V source. Then i connected a huge heatsink to the both regulators but I'm sure there should be another way to solve heating problem.
Can you suggest me a good way to convert 12V to 5V and 3.3V, which kind of dc-converter should I choose?
Thank you.