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ADP3422 Datasheet(PDF) 8 Page - Analog Devices |
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ADP3422 Datasheet(HTML) 8 Page - Analog Devices |
8 / 16 page REV. 0 ADP3422 –8– ADOPT is a trademark of Analog Devices, Inc. Pin No. Mnemonic Function 25 RAMP Regulation Ramp Feedback Input. This is a high-impedance analog input pin which is used for providing negative feedback of the hysteretically-controlled output. Several switched current sources also appear at this input, most notably the cycle-by-cycle hysteresis-setting switched current programmed by the HYSSET pin. The external resistive termination at this pin sets the magnitude of the hysteresis applied to the regulation loop. 26 REG Regulation Voltage Summing Input. This is a high-impedance analog input pin into which the voltage reference of the feedback loop allows the summing of both the DACOUT voltage and the core voltage for programming the output resistance of the core voltage regulator. This is also the pin at which an optimized transient response can be tailored using Analog Devices’ patented ADOPT™ design technique. 27 CS+ Current Limit Positive Sense. This is a high-impedance analog input pin that is normally connected to the positive node of the current sense resistor. 28 CS– Current Limit Negative Sense. This is a high-impedance analog input pin that is normally connected via a current-limit programming resistor to the negative node of the current sense resistor. A hysteretically- controlled current—three times the current programmed at the HYSSET pin—flows out of this pin and develops a current-limit-setting voltage across that resistor. This voltage must be exceeded by the inductor current generated current sense voltage in order to trigger the current limit function. When it is triggered, the current flowing out of this pin is reduced—to two-thirds of its previous value—producing hysteresis in the current limit operation. |
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