Hi,
I have a new D15V35F5S3 step-down regulator. I tested it before connecting to an expensive VGA frame-grabber, and found it’s outputting about double the expected voltage.
When 3V3SEL is open-circuit I get ~10.2V between VOUT and GND (measured with my Fluke 177).
When 3V3SEL is bridged, I get ~6.4V between VOUT and GND.
VIN is at 12.8V according to the same Fluke DVM. The Fluke agrees to within <0.1V with the digital meter on the 40A bench supply I’m using to supply the power, so I’m pretty confident the Fluke’s right.
I get very similar results whether unloaded or when loaded with a small 12V DC motor (all I have to hand just now.) The circuit is very simple - the only connection not mentioned so far is that I have EN connected to VIN.
Has anyone else come across this?
I want to use the 5V-powered frame-grabber on a boat that only has 12VDC, no AC and no safely dry place to put an inverter, but should I be trusting $1,000 worth of frame-grabber to this reg, or am I being foolish?
Thanks,
Tom