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ACE738DFM+H Datasheet(PDF) 6 Page - ACE Technology Co., LTD. |
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ACE738DFM+H Datasheet(HTML) 6 Page - ACE Technology Co., LTD. |
6 / 12 page 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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