| Electronics > Beginners |
| Linear Technology LT1963 1.5A LDO - Output current no more than 100mA! |
| << < (4/6) > >> |
| 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... :-[ |
| Navigation |
| Message Index |
| Next page |
| Previous page |