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A Product Line of
Diodes Incorporated
ZXLD1352
Dimming Output Current Using PWM
When the ADJ pin is driven with a low frequency PWM signal (eg 100Hz), with a high level voltage V ADJ and a low level of zero,
the output current will be switched on and off at the PWM frequency, resulting in an average output current I OUTavg proportional
to the PWM duty cycle. (See Figure 2)
V ADJ
PWM Voltage
0V
Ton
Toff
IOUTnom
Output Current
0
Figure 3. Low Frequency PWM Operating Waveforms
The average value of output current in this mode is given by:
The average value of output current is given by:
0.1/Rs
IOUTavg
I OUTavg = 0.1D PWM /R S
for D PWM >0.01
PWM dimming is preferable to DC dimming if optimum LED 'whiteness' is required. It will also provide the widest possible
dimming range (approx. 1000:1) and higher efficiency at the expense of greater output ripple.
ZXLD1352
Document number: DS33469 Rev. 3 - 2
19 of 21
www.diodes.com
December 2010
? Diodes Incorporated
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