SH3100 Datasheet, PDF (68/80 Pages) Semtech Corporation – Supervisory IC with I2C Interface and PWM

POWER MANAGEMENT
Functional Descriptions (continued)
PDM Mode
An alternative to Pulse Width Modulation (PWM) is Pulse
Density Modulation, or PDM. This produces the maximum
number of pulses while maintaining the average duty
cycle, thereby requiring less smoothing capacitance on
the PWM output to yield the same ripple. Both automatic
fan control mode and Manual PWM control mode have
the option of running PDM instead of PWM by setting the
PDM/PWM bit in the DutyCycleStepSize register.
SH3100
© 2006 Semtech Corp.
68
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