I need to get 3.8 V at about 2 A from an input of 60 - 80 V DC.
The voltage is too high for most of the simple buck regulators, so I've been looking at using a transformer, as in most mains voltage input SMPSs.
I'm thinking of using something like XP POWER | ECL10US05-T | Switch Mode | Electrical & Circuit Protection | Farnell UK
I am fairly sure that the output voltage is set by two fixed resistors and that I can tweek the output voltage by changing one of them.
What I am less confident about is the input voltage. 60V is only half of the bottom of the DC input voltage range. Will I need to reduce the number of turns on the primary of the transformer? I guess that the primary will be wound on first so that will basically need rebuilding the transformer.
I have found some SMPS controller ICs. Their example circuits seem to be much the same as one of the power supplies. Has anyone used one and has any hints or suggestions in this case?
The voltage is too high for most of the simple buck regulators, so I've been looking at using a transformer, as in most mains voltage input SMPSs.
I'm thinking of using something like XP POWER | ECL10US05-T | Switch Mode | Electrical & Circuit Protection | Farnell UK
I am fairly sure that the output voltage is set by two fixed resistors and that I can tweek the output voltage by changing one of them.
What I am less confident about is the input voltage. 60V is only half of the bottom of the DC input voltage range. Will I need to reduce the number of turns on the primary of the transformer? I guess that the primary will be wound on first so that will basically need rebuilding the transformer.
I have found some SMPS controller ICs. Their example circuits seem to be much the same as one of the power supplies. Has anyone used one and has any hints or suggestions in this case?