New Dell AC Adapter Charger Inspiron 15, 15-3542,15-3537 Power Adapter 19.5V 3.34A 65W with Pin Size 4.5MM x 3.0MM, please note that Older Version for these models takes the bigger pin size:
Dell Inspiron 15 3542 Charger Replacement Dell Laptop Power Supply Best Buy In NZ
Amazon.com: UL Listed 65W AC Charger Fit for Dell Inspiron 3521 3520 3531 3537 3541 3542 3543 5447 5548 7548 5748 15R 5521 5537 5520 N5010 N5110 N7110 N7010 N4010 N4110 15 17 Laptop Power Adapter Supply Cord : Electronics