This is my circult diagram for my high intensity LED torch. (attached)
My idea is to use PWM for the control of the brightness to achieve high efficiency.
However, I encounted a problem...
This digital rheostat only has a 64 steps, hence leading to a increase from 66% to 96.9% duty cycle for the last step. This is not favourable to me, is there anyway to solve this, or can some1 recommend me a digital rheostat with >100 steps.
anws value for B:
if using 10Ω-10kΩ - B is 316.2Ω for max duty cycle variation
if using 100Ω-100kΩ - B is 3162Ω for max duty cycle variation
if using 50Ω-50kΩ - B is 1581Ω for max duty cycle variation
max variation is from 3.07% to 96.9% , if possible pls recommend me a better digital rheostat with more steps. Feel free to comment on my setup
Datasheet for digi rheostat
http://datasheets.maxim-ic.com/en/ds/DS1869.pdf
My idea is to use PWM for the control of the brightness to achieve high efficiency.
However, I encounted a problem...
This digital rheostat only has a 64 steps, hence leading to a increase from 66% to 96.9% duty cycle for the last step. This is not favourable to me, is there anyway to solve this, or can some1 recommend me a digital rheostat with >100 steps.
anws value for B:
if using 10Ω-10kΩ - B is 316.2Ω for max duty cycle variation
if using 100Ω-100kΩ - B is 3162Ω for max duty cycle variation
if using 50Ω-50kΩ - B is 1581Ω for max duty cycle variation
max variation is from 3.07% to 96.9% , if possible pls recommend me a better digital rheostat with more steps. Feel free to comment on my setup
Datasheet for digi rheostat
http://datasheets.maxim-ic.com/en/ds/DS1869.pdf
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