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ACE729CIM+H データシート(PDF) 5 Page - ACE Technology Co., LTD.

部品番号 ACE729CIM+H
部品情報  4A, 16V High Efficiency Synchronous Step-Down Converter
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メーカー  ACE [ACE Technology Co., LTD.]
ホームページ  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE729CIM+H データシート(HTML) 5 Page - ACE Technology Co., LTD.

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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.


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