Two power control peripherals on high pin-count versions of its RX63T 100MHz 32bit microcontrollers has been brought out by the Renesas, including a high-speed PWM generator and a adaptive hardware control loop.
As per Renesas, The functions are implemented in hardware, so the processing capabilities of the 32bit RX core can be applied to the main processing routine, motor or inverter control for example, while dc-dc power management control takes place simultaneously. Components variation of up to -35/+50% could be accepted .
The Higher resolution pulse generation comes via a 32x phase-locked loop which boosts PWM sub-system clocking to 3.2GHz, increasing resolution to 312.5ps when the core is clocked at 100MHz. This compares to 10ns resolution available previously. PWM counting is 16 bit.
A hardware proportional-integral control loop algorithm is executed by the control loop block, which also automatically sustains PSU performance in the face of production variations in components including the main inductor and capacitor.
The company is formulating an Excel-based simulation tool to aid designers to generate starting values for the various algorithm parameters.
Both the new blocks are only available in 100, 112, 120 and 144pin versions of RX63T microcontrollers and the 2 of the blocks have been in the silicon for a while, but only now are they qualified and examined.
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