General Description
The AOZ1014 is a high efficiency, simple to use, 5A buck regulator. The AOZ1014 works from a 4.5V to 16V input voltage range, and provides up to 5A of continuous
output current with an output voltage adjustable down to 0.8V.
The AOZ1014 comes in SO-8 and DFN-8 packages and is rated over a -40°C to +85°C ambient temperature range
Applications
●Point of load DC/DC conversion●PCIe graphics cards●Set top boxes●DVD drives and HDD ●LCD panels●Cable modems
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Telecom/networking/datacom equipmen
AOZ1014
Rev. 1.2 October Page 9 of 19
The combination of R1 and R2 should be large enough to avoid drawing excessive current from the output, which will cause power loss.
Since the switch duty cycle can be as high as ***, the maximum output voltage can be set as high as the input voltage minus the voltage drop on upper PMOS and inductor.
Protection Features
The AOZ1014 has multiple protection features to prevent system circuit damage under abnormal conditions.
Over Current Protection (OCP)
The sensed inductor current signal is also used for over current protection. Since the AOZ1014 employs peak current mode control, the COMP pin voltage is proportional to the peak inductor current. The COMP pin voltage is limited to be between 0.4V and 2.5V internally. The peak inductor current is automatically limited cycle by cycle.
The cycle by cycle current limit threshold is set between 6A and 8A. When the load current reaches the current limit threshold, the cycle by cycle current limit circuit turns off the high side switch immediately to terminate the current duty cycle. The inductor current stops rising. The cycle by cycle current limit protection directly limits inductor peak current. The average inductor current is also limited due to the limitation on peak inductor current. When the cycle by cycle current limit circuit is triggered, the output voltage drops as the duty cycle is decreasing. The AOZ1014 has internal short circuit protection to protect itself from catastrophic failure under output short circuit conditions. The FB pin voltage is proportional to the output voltage. Whenever FB pin voltage is below 0.2V, the short circuit protection circuit is triggered.
As a result, the converter is shut down and hiccups at a frequency equal to 1/8 of normal switching frequency. The converter will start up via a soft start once the short circuit condition disappears. In short circuit protection mode, the inductor average current is greatly reduced
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胡R
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Tezy Electronic
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