Electronics > Beginners
Linear Technology LT1963 1.5A LDO - Output current no more than 100mA!
bson:
Shouldn't you connect the output - rail to ground?
hgg:
It is connected to ground when the MOSFET is ON and because the gate is connected
to 2.6V, its always ON.
Kjelt:
Is it me or is your diode reversed ?
Jay_Diddy_B:
Hi,
In this picture I can't see a connection between the two negative rails and the two positive rails:
You have to connect them like this:
Regards,
Jay_Diddy_B
hgg:
kjelt, you are right, I have updated the schematic, but in reality the LED is properly connected.
Jay_Diddy_B The upper rail is the 4.2V power supply rail and the lower one is the LDO 2.6V output rail.
I have only connected the grounds together. Here is another photo with the MOSFET in circuit:
The MOSFET works as expected, gate to 2.6V LED is ON and gate to ground LED is OFF.
But when the MOSFET is on, the 2.6V power rail becomes a 3.2V rail...
Does it affect the LDO ADJ pin voltage divider?
Because the ADJ voltage changes as well to a higher value.
Strange. Please help... :-[
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