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We would like to use ON's NCP1034 in a constant output voltage DC-DC converter. The limitation is the hiccup protection mode that, when we turn lamps on in the output, the hiccup works due to lamps' inrush current. Is there any imaginative way to implement a foldback protection mode to a 13V 20A output, or limit the output current at 20A, even decreasing de output voltage? Best regards

There might be an issue with an overcorrect protection setting. The programmed current limit is set by selecting the value of R7, which is connected between pin 1 OCset and GND. If the voltage drop is larger than the set value, the NCP1034 goes into hiccup mode. During this time, both external MOSFETs are turned off and the soft start capacitor is discharged with a current equal to 5% of the charging current. The capacitor continues to discharge until the voltage reaches 0.25 V, and then the IC initiates a standard soft start sequence. Answered by:
ON Semiconductor
2013-07-04 02:44:36.617