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ACE707A データシート(PDF) 6 Page - ACE Technology Co., LTD. |
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ACE707A データシート(HTML) 6 Page - ACE Technology Co., LTD. |
6 / 9 page ACE707A Technology Micro Power Step-up DC-DC Converter VER 1.2 6 ACE707A, ISMITCH=300mA ACE707A, ISMITCH=70mA Junction Temperature (℃) Junction Temperature (℃) Figure 7. Saturation Voltage vs. Junction Temperature Figure 8. Saturation Voltage vs. Junction Temperature Load Current (mA) Load Current (mA) Figure 9. Efficiency Figure 10. Efficiency Application Information Operating Principles ACE707A feature a constant off-time control scheme. Refer to Figure 3, the bandgap voltage VREF (1.23V typical) is used to control the output voltage. When the voltage at the FB pin drops below the lower hysteresis point of Feedback Comparator (typical hysteresis is 8mV), the Feedback Comparator enables the chip and the NPN power switch is turned on, the current in the inductor begins to ramp up and store energy in the coil while the load current is supplied by the output capacitor. Once the current in the inductor reaches the current limit, the Current-Limit Comparator resets the 400ns One-Shot which turns off the NPN switch for 400ns. The SW voltage rises to the output voltage plus a diode drop and the inductor current begins to ramp down. During this time the energy stored in the inductor is transferred to COUT and the load. After the 400ns off-time, the NPN switch is turned on and energy will be stored in the inductor again. This cycle will continue until the voltage at FB pin reaches 1.23V, the Feedback Comparator disables the chip and turns off the NPN switch. The load current is then supplied solely by output capacitor and the output voltage will decrease. When the FB pin voltage drops below the lower hysteresis point of Feedback Comparator, the Feedback Comparator enables the device and repeats the cycle described previously. Under not switching condition, the IQ of the device is about 17μA. |
同様の部品番号 - ACE707A |
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同様の説明 - ACE707A |
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