The OB21081/A is a high-efficiency step-down DC-DC converter. The chip adopts a self-regulating COT architecture, and the CCM operating frequency is basically unchanged under a wide range of input voltages. When the load changes, the frequency conversion achieves a good dynamic response. The chip has a built-in analog ripple circuit, which does not require an external compensation network and provides a stable output over a wide load range.
The chip integrates over-current protection and over-temperature protection to prevent damage to the chip when it is overloaded or the temperature is too high. It integrates input voltage under-voltage protection, over-voltage protection, and output voltage short-circuit protection to ensure the safety of the chip under various voltage conditions.

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Characteristic
120V maximum operating voltage
±2% feedback voltage accuracy
Input under-voltage protection, over-voltage protection
Output short-circuit protection
Over-temperature protection
Overcurrent protection
The output current capability is adjustable by an external MOS on-resistor
Enable control
Delayed shutdown function