LCD current requirement - help needed

[ilikebbs]

LCD current requirement

backlight lamp require 4mA and 1000v. The power is 4w.
So what is the input current of module. i use a module to power the lamp.
the input voltage is 5v.
does it require 0.8mA? or does it just require a little greater than 4mA?

 

[chuckey]

If the output power is 1000 X 4 mA, that's 4Watts, so your input power will be greater then 4W, say 5 W, that's 1A at 5V.
Frank

 

[jpsganesh]

Re: LCD current requirement

does it require 0.8mA?

for 5V it is 800mA ie. 0.8A

losses due to boosting the voltage (boost converter) to 1000V depends on what type of coverter u r using and it's efficiency. But it'll be more than 4W.