I am hitting a brick wall with a circuit, I’m certain I have probably done something silly when selecting my components.
So my circuit is shown below:
U1 - ROE-0505S Isolated DCDC converter.
U2 - TLP523-2 Optocoupler with built in Darlington transistor
Relay - SRD 05vdc sl c relay standalone not on breakout board.
D1 - 1N4007 diode.
R1 - 220Ohm resistor
So with the above circuit the relay never fires, I know the opto is working and the gain should be sufficent. All I can think is the optocouplers gain is not sufficient but according to the datasheet I should be able to get 100mA out from it which should be more than enough to fire the relay coil which is rated at 70mA. And the isolated DCDC converter has 200mA rating.
As I said up top I’m sure I have done something silly. So if anyone can point out what I’m doing wrong I would appreciate it.
TLP523-4_datasheet_ja_20170511.pdf (946 KB)
SRD-05VDC-SL-C-Datasheet.pdf (91.7 KB)
ROE.pdf (945 KB)