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ACE705160BM+H Arkusz danych(PDF) 5 Page - ACE Technology Co., LTD. |
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ACE705160BM+H Arkusz danych(HTML) 5 Page - ACE Technology Co., LTD. |
5 / 14 page ACE705 High efficiency, Low supply current, step-up DC/DC Controller VER 1.4 5 Typical Application (1) Application with external NMOSFET Vin D 1N5817 Vout L 27uH EXT OUT Cin ACE705 47uF Cout Rload CE GND Cp 100uF Tan OFF ON 1nF Figure 1 (2) Application with external NPN transistor ACE705 Figure 2 Note: R1=330Ω, C1=10nF. (R1 can be calculated by load. If load is light R1’s value can be added. If load is heavy R1’s value can be smaller. ) Detailed Description The ACE705 series are boost structure, voltage-type pulse-frequency modulation(PFM) step-up DC-DC controller. Only four external components are necessary: an inductor, a schottky diode, an output filter capacitor and a NMOSFET or a NPN transistor. The step-up DC-DC converter, constructed by ACE705, can be adjusted from 2.5V to 6.0V, 0.1V step. By using the depletion technics, the quiescent current drawn from power source is lower than 8uA. The high efficiency device consists of resistors for output voltage detection and trimming, a start-up voltage circuit, an oscillator, a reference circuit, a PFM control circuit, a switch protection circuit and a driver transistor. ACE705 integrates PFM control system. This system controls fixed power switch on duty cycle frequency to stabilize output voltage by calculating results of other blocks which sense input voltage, output voltage, output current and load conditions. In PFM modulation system, the frequency and pulse width is fixed. The duty cycle is adjusted by skipping pulses, so that switch on-time is changed based on the conditions such as input voltage, output current and load. The oscillate block inside ACE705 provides fixed frequency and pulse width wave. |
Podobny numer części - ACE705160BM+H |
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Podobny opis - ACE705160BM+H |
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