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ACE729CIM+H データシート(PDF) 5 Page - ACE Technology Co., LTD. |
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ACE729CIM+H データシート(HTML) 5 Page - ACE Technology Co., LTD. |
5 / 8 page ACE729C 4A, 16V High Efficiency Synchronous Step-Down Converter VER 1.1 5 Functional Decriptions Loop Operation The ACE729C is a wide input range, high-efficiency, DC-to- DC step-down switching regulator, capable of delivering up to 4A of output current, integrated with a 120/60m synchronous MOSFET pair, eliminating the need for external diode. 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 the 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. Current Limit There is a cycle-by-cycle current limit on the high-side MOSFET of 6A (typ). When the current flowing out of SW exceeds this limit, the high-side MOSFET turns off and the synchronous rectifier turns on. Unlike the traditional method of current limiting by limiting the voltage at the compensation pin, which usually has large variation due to duty cycle variance, this type of peak current limiting scheme provides a relatively more accurate limit for output current, thereby lowering the requirements for system design. 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. ACE729C 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. |
同様の部品番号 - ACE729CIM+H |
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同様の説明 - ACE729CIM+H |
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