IR3895M_15 Datasheet, PDF (27/45 Pages) International Rectifier – Single‐Input Voltage, Synchronous Buck Regulator

16A Highly Integrated SupIRBuck
Single‐Input V_-o₂l₇ta_-Pge, Synchronous Buck Regulator
MAXIMUM DUTY RATIO
A certain off‐time is specified for IR3895. This provides
an upper limit on the operating duty ratio at any given
switching frequency. The off‐time remains at a relatively
fixed ratio to switching period in low and mid frequency
range, while in high frequency range this ratio increases,
thus the lower the maximum duty ratio at which IR3895
can operate. Figure 21 shows a plot of the maximum duty
ratio vs. the switching frequency with built in input voltage
feed forward.
PD‐97746
IR3895
Figure 21: Maximum duty cycle vs. switching frequency.
27 JANUARY 18, 2013 | DATA SHEET| Rev 3.4