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L6460 датащи(PDF) 75 Page - STMicroelectronics |
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L6460 датащи(HTML) 75 Page - STMicroelectronics |
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75 / 139 page ![]() L6460 Power bridges Doc ID 17713 Rev 1 75/139 voltage thresholds) using serial interface. The feedback reference voltage is selected by writing the SelFBRef[1:0] bits in the Aux1SwCfg or Aux2SwCfg registers. The switching regulators have four possible PWM duty cycles that can be changed using SPI according to Table 28. 14.1.7 Regulation loop As seen before L6460 contains 2 regulation loops for switching regulators that are used when bridge 3 is used as a regulator. These loops are assembled using internal comparators and filters similar to that used in main switching regulator. When bridge 3 is not used for this purpose or when only one regulation loop is needed, the control loop is available on a GPIO output thus enabling the customer to assembly a basic buck switching regulator using an external Power FET. The comparators used in the above mentioned regulation loops are general purpose low voltage (3.3 V) comparators; when the relative regulation loop is not used they can be accessed as shown in the Figure 20. Figure 20. Internal comparator functional block diagram Table 28. PWM specification AuxXPWMTable[1:0] Typical duty cycle value Comments 00 10% 01 13% Default state for AUX1 10 24% Default state for AUX2 11 61% GPIOz GPIOx GPIOx DECODE LOGIC GPIOy GPIOy DECODE LOGIC GPIOz Logic Driver + V3v3 GPIOz DECODE LOGIC GPIOz Value From SPI GPIOzMod e GPIOyMode |
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