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Digital Control

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Sampled and<br />

Average Currents<br />

PWM 0<br />

PWM 1<br />

ADC trigger Signal<br />

calc.<br />

T1<br />

PWM Period<br />

Temp<br />

end of scan interrupt end of scan interrupt<br />

Calculation<br />

A/D Converters<br />

- PWM Synchronization Benefits<br />

Voltage<br />

ADC Sampling helps to filtering the measured current - antialiasing.<br />

Noise free ADC sampling when the power switch is not acting<br />

Freescale, the Freescale logo, AltiVec, C-5, CodeTEST, CodeWarrior, ColdFire, C-Ware, mobileGT, PowerQUICC, StarCore, and Symphony are trademarks of Freescale Semiconductor, Inc.,<br />

Reg. U.S. Pat. & Tm. Off. BeeKit, BeeStack, CoreNet, the Energy Efficient Solutions logo, Flexis, MXC, Platform in a Package, Processor Expert, QorIQ, QUICC Engine, SMARTMOS, TurboLink<br />

and VortiQa are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © 2010 Freescale Semiconductor, Inc. 68<br />

Inductor Current I 1<br />

Inductor Current I 2<br />

ADC sample is taken at middle of PWM pulse which is equal to average current<br />

TM

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