J
Joerg
- Jan 1, 1970
- 0
Hello Folks,
Need to drive up to 16 LEDs from a serial data. To avoid as many
resistors as LEDs there are some nice chips such as the TLC5923, for
under $1.50. This one current-controls all 16 LED individually and AFAIK
allows brightness control from a port in addition to the usual resistor.
Which is exactly what I'd need and the price is right. Of course, a chip
like this does get hot.
Since EEs always want one more thing: Is there such a chip that does
some kind of PWM instead of burning off the excess voltage in a linear
stage? An inductor wouldn't be a problem either, as long as it's only one.
What I could imagine is something that runs a buck converter and then
each LED is fed via an LDO that controls the current. The buck converter
would operate just at the point that none of the 16 LDOs runs out of
steam. Technically this can certainly be done but is there already such
a chip?
Regards, Joerg
Need to drive up to 16 LEDs from a serial data. To avoid as many
resistors as LEDs there are some nice chips such as the TLC5923, for
under $1.50. This one current-controls all 16 LED individually and AFAIK
allows brightness control from a port in addition to the usual resistor.
Which is exactly what I'd need and the price is right. Of course, a chip
like this does get hot.
Since EEs always want one more thing: Is there such a chip that does
some kind of PWM instead of burning off the excess voltage in a linear
stage? An inductor wouldn't be a problem either, as long as it's only one.
What I could imagine is something that runs a buck converter and then
each LED is fed via an LDO that controls the current. The buck converter
would operate just at the point that none of the 16 LDOs runs out of
steam. Technically this can certainly be done but is there already such
a chip?
Regards, Joerg