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ATtiny43U Datasheet(PDF) 43 Page - ATMEL Corporation |
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ATtiny43U Datasheet(HTML) 43 Page - ATMEL Corporation |
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43 / 182 page  43 8048B–AVR–03/09 To stop the boost converter, follow the below procedure: 1. Write 110x xxxx to the Power Reduction Register, PRR 2. Within 3 clock cycles of the above, write 10xx xxxx to PRR 3. Within 4 clock cycles of the first step, write 01xx xxxx to PRR 8.5.2 Switching to Full Duty Cycle Mode of Operation When duty cycle control is disabled the output voltage of the boost converter will rise as fast as possible, resulting in a minimum switching time and a maximum idle time for the converter. To turn on Full Duty Cycle (FDC) mode, follow the below procedure: 1. Write 110x xxxx to the Power Reduction Register, PRR 2. Within 3 clock cycles of the above, write 10xx xxxx to PRR 3. Within 4 clock cycles of the first step, write 111x xxxx to PRR 8.5.3 Switching to Normal (Variable Duty Cycle) Mode of Operation To return duty cycle control to the boost converter, follow the below procedure: 1. Write 111x xxxx to the Power Reduction Register, PRR 8.6 Component Selection Refer to Figure 8-2 on page 37 for component placement and numbering. 8.6.1 Inductor Low inductance increases peak currents of the inductor, creating more interference noise and lowering the overall efficiency of the converter. Too high inductance values force the converter into non-stable operation. The boost converter has been optimized for a certain size inductance, L, and may not work reliably if other inductance values are used. See “Boost Converter Compo- nent Values” on page 45. The inductor must be able to tolerate the following input current: ... where η is the efficiency of the converter at given voltages and load current. See “Boost Con- verter Efficiency vs. Load Current and VBAT Voltage” on page 166. The inductor must also be able to tolerate short peak currents. At steady state, i.e. when the converter has stabilised after a constant load current has been introduced, the peak current is calculated as follows: I IN V CC I LOAD × V BAT η × -------------------------------- = I PEAK V BAT T S D × × L ------------------------------------ = |
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