Proteus simulation. This design can realises a steady voltage output to light a LED. By changing the duty ratio of PWM, the light luminance can be adjusted.

example2_LED_luminance
......................\Backup Of Buck_power.DBK
......................\Buck_power.PWI
......................\CONFIG.H
......................\Last Loaded Buck_power.DBK
......................\Last Loaded PWM.DBK
......................\Last Loaded PWM_LED.DBK
......................\LPC213x.h
......................\pwm.axf
......................\pwm.c
......................\pwm.crf
......................\pwm.d
......................\pwm.hex
......................\pwm.htm
......................\pwm.lnp
......................\pwm.map
......................\pwm.o
......................\pwm.plg
......................\PWM.PWI
......................\pwm.sct
......................\pwm.tra
......................\pwm.uvgui.Administrator
......................\pwm.uvgui_Administrator.bak
......................\pwm.uvopt
......................\pwm.uvproj
......................\pwm.__i
......................\PWM_LED.DSN
......................\PWM_LED.PWI
......................\pwm_Target 1.dep
......................\pwm_uvopt.bak
......................\pwm_uvproj.bak
......................\Startup.d
......................\Startup.lst
......................\Startup.o
......................\Startup.s
......................\TARGET.C
......................\TARGET.H

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