two transistor driver

Status
Not open for further replies.

adam2

New Member
Hello,

I am going to use the output of the following circuit to drive a 7-segment LED display:
http://www.adwojnowski.webpark.pl/leddriver.gif

I am going to need 5 displays (and 5 such circuits). Is there an IC that contains the elements that I need (shown in the picture)?

Thanks,
Adam
 

Attachments

  • leddriver.gif
    3.3 KB · Views: 929
Well, there might be something that will work, depending on a few things.
What is the positive supply voltage? What are you driving the input with? How much current does the PNP have to pass?
 
> Well, there might be something that will work, depending on
> a few things.
Here come the answers:

> What is the positive supply voltage?
5 V (3.3V is also available)

> What are you driving the input with?
Xilinx FPGA (probably Xilinx 4000)

> How much current does the PNP have to pass?
A few mA. It is going to drive a LED
 
Well, the 74LVC4245A looks like it will work provided you keep total device current below 100ma. This would mean you would probably want to limit LED current to about 18ma each. The package may be larger than you hoped for.
 
Status
Not open for further replies.
Cookies are required to use this site. You must accept them to continue using the site. Learn more…