Hi all-
I've been somewhat involved with electronics for a long time, but I've never been real good at analyzing analog circuits, and I was hoping someone could sanity check my work....
I'm trying to drive a network of red/green LEDs (they're the backlight for a keypad), the max current will be 240mA. The MOSFETs I'm planning on using are Fairchild FDC6420C, they're logic level with an n and p channel in the same package.
The two control lines will be connected to a PIC, I have lines to spare so I could drive Q1 and Q2 with different outputs, but with the extra MOSFET available (Q3-2) I used it as shown...
Other than the obvious question of 'will this work?' I have a few others:
-Does R2 need to exist? If it does whats a reasonable value?
-Should I tie the two control lines to ground with 10k resistors?
-On a completely unrelated note: would this circuit be suitable for driving a DC motor (if clamping diodes are added)?
Thanks for any help...
I've been somewhat involved with electronics for a long time, but I've never been real good at analyzing analog circuits, and I was hoping someone could sanity check my work....
I'm trying to drive a network of red/green LEDs (they're the backlight for a keypad), the max current will be 240mA. The MOSFETs I'm planning on using are Fairchild FDC6420C, they're logic level with an n and p channel in the same package.
The two control lines will be connected to a PIC, I have lines to spare so I could drive Q1 and Q2 with different outputs, but with the extra MOSFET available (Q3-2) I used it as shown...
Other than the obvious question of 'will this work?' I have a few others:
-Does R2 need to exist? If it does whats a reasonable value?
-Should I tie the two control lines to ground with 10k resistors?
-On a completely unrelated note: would this circuit be suitable for driving a DC motor (if clamping diodes are added)?
Thanks for any help...