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ACE725E bảng dữ liệu(PDF) 8 Page - ACE Technology Co., LTD. |
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ACE725E bảng dữ liệu(HTML) 8 Page - ACE Technology Co., LTD. |
8 / 11 page ACE725E 24V , 1.2A High Efficiency Step-Down Converter VER 1.1 8 FUNCTIONAL DECRIPTIONS Loop Operation The ACE725E is a wide input range, high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to 1.2A of output current, integrated with a 250m high-side MOSFET. It uses a PWM current-mode control scheme. An error amplifier integrates error between the FB signal and the internal reference voltage. The output of the integrator is then compared to t he sum of a current-sense signal and the slope compensation ramp. This operation generates a PWM signal that modulates the duty cycle of the power MOSFETs to achieve regulation for output voltage. Light Load Operation Traditionally, a fixed constant frequency PWM DC-DC regulator always switches even when the output load is small. When energy is shuffling back and forth through the power MOSFETs, power is lost due to the finite RDSONs of the MOSFETs and parasitic capacitances. At light load, this loss is prominent and efficiency is therefore very low. ACE725E employs a proprietary control scheme that improves efficiency in this situation by enabling the device into a power save mode during light load, thereby extending the range of high efficiency operation. APPLICATION INFORMATION Setting Output Voltages Output voltages are set by external resistors. The FB threshold is 0.6V. RTOP = RBOTTOM x [(VOUT / 0.6) - 1] Inductor Selection The peak-to-peak ripple is limited to 30% of the maximum output current. This places the peak current far enough from the minimum overcurrent trip level to ensure reliable operation while providing enough current ripples for the current mode converter to operate stably. In this case, for 1.2A maximum output current, the maximum inductor ripple current is 400 mA. The inductor size is estimated as following equation LIDEAL=(VIN(MAX)-VOUT)/IRIPPLE*DMIN*(1/FOSC) Therefore, for VOUT=5V, The inductor values is calculated to be L = 7μH. Chose 6.8μH or 10μH For VOUT =3.3V, The inductor values is calculated to be L = 4.9μH. Chose 4.7μH |
Số phần tương tự - ACE725E |
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Mô tả tương tự - ACE725E |
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