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ACE738DFM+H Datasheet(PDF) 6 Page - ACE Technology Co., LTD.

No. de pieza ACE738DFM+H
Descripción Electrónicos  2A, 24V Synchronous Step-Down Converter
Download  12 Pages
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Fabricante Electrónico  ACE [ACE Technology Co., LTD.]
Página de inicio  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE738DFM+H Datasheet(HTML) 6 Page - ACE Technology Co., LTD.

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ACE738D
2A, 24V Synchronous Step-Down Converter
VER 1.1
6
Functional Description
The ACE738D is a synchronous, buck voltage converter.
Current-Mode Control
The ACE738D utilizes current-mode control to regulate the FB voltage. Voltage at the FB pin is regulated
at 0.923V so that by connecting an appropriate resistor divider between VOUT and GND, designed output
voltage can be achieved.
PFM Mode
The ACE738D operates in PFM mode at light load. In PFM mode, switch frequency is continuously
controlled in proportion to the load current, i.e. switch frequency is decreased when load current drops to
boost power efficiency at light load by reducing switch-loss, while switch frequency is increased when
load current rises, minimizing both load current and output voltage ripples.
Internal Soft-Start
Soft-start makes output voltage rising smoothly by following an internal SS voltage until SS voltage is
higher than the internal reference voltage. It can prevent the overshoot of output voltage during startup.
Power Switch
N-Channel MOSFET switches are integrated on the ACE738D to down convert the input voltage to the
regulated output voltage. Since the top MOSFET needs a gate voltage greater than the input voltage, a
boost capacitor connected between BST and SW pins is required to drive the gate of the top switch. The
boost capacitor is charged by the internal 3.3V rail when SW is low.
Vin Under-Voltage Protection
A resistive divider can be connected between Vin and ground, with the central tap connected to EN, so
that when Vin drops to the pre-set value, EN drops below 1.2V to trigger input under voltage lockout
protection.
Output Current Run-Away Protection
At start-up, due to the high voltage at input and low voltage at output, current inertia of the output
inductance can be easily built up, resulting in a large start-up output current. A valley current limit is
designed in the ACE738D so that only when output current drops below the valley current limit can the
bottom power switch be turned off. By such control mechanism, the output current at start-up is well
controlled.
Over Current Protection and Hiccup
ACE738D has a cycle-by-cycle current limit. When the inductor current triggers current limit, ACE738D
enters hiccup mode and periodically restart the chip. ACE738D will
exit
hiccup
mode while not
triggering current limit.


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