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ACE727Z bảng dữ liệu(PDF) 6 Page - ACE Technology Co., LTD.

tên linh kiện ACE727Z
Giải thích chi tiết về linh kiện  18V, 3A, High Efficiency Synchronous Step-Down Converter
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nhà sản xuất  ACE [ACE Technology Co., LTD.]
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ACE727Z
18V, 3A, High Efficiency Synchronous Step-Down Converter
VER 1.1
6
Functional Description
The ACE727Z is a synchronous buck regulator ICs that integrates the PWM control, top and bottom
switches on the same die to minimize the switching transition loss and conduction l
The ACE727Z is a wide input range, high efficiency, DC-to-DC step-down switching regulator, capable of
delivering up to 3A of output current, integrated with a 155mΩ high side and 88mΩ low side MOSFET. It
uses 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 MOSFET 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 MOSFET, power is lost due to
the finite Rdson of the MOSFET and parasitic capacitances. At light load, this loss is prominent and
efficiency is therefore very low. ACE727Z employs a proprietary control scheme that improves efficiency
in this situation by enabling then device into a power save mode during light load, thereby extending the
range of high efficiency operation.
Enable
EN is a digital control pin that turns the ACE727Z on and off. Drive EN High to turn on the regulator, drive
it Low to turn it off. An internal 1MΩ resistor from EN pin to GND allows EN to float to shut down the chip.
Connecting the EN pin through a pull up resistor or shorted EN to IN will automatically turn on the chip
whenever plug in IN.
Over Current Protection and Hiccup
ACE727Zhas a cycle-by-cycle over current limit for when the inductor current peak value is over the set
current limit threshold. When the output voltage drop until FB falls below UV threshold (0.2V), the
ACE727Z will enter hiccup mode. It will turn off the chip immediately for 6mS. After that, it will try to
re-starts as normal for 2mS. After 2mS, if FB is still below UV threshold, then the chip enters hiccup mode
again. If FB is higher than UV threshold, it will enter the normal mode.
Over-Temperature Protection
Thermal protection disables the output when the junction temperature rises to approximately 150°C,
allowing the device to cool down. When the junction temperature cools to approximately 110°C, the output
circuitry is again enabled. Depending on power dissipation, thermal resistance, and ambient temperature,
the thermal protection circuit may cycle on and off. This cycling limits regulator dissipation, protecting the
device from damage as a result of overheating.


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