NCP1255PRNGEVB: 15 W NOM 40 W PK Adapter Evaluation Board

The NCP1255 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a SOIC-8 package. With a supply range up to 35 V, the controller hosts a jittered 65-kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller automatically folds back its switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while freezing the peak current setpoint.To help build rugged converters, the controller features several key protective features: a brown-out, a non-dissipative Over Power Protection for a constant maximum output current regardless of the input voltage, two latched over voltage protection inputs 0 either through a dedicated pin or via the Vcc input - and finally, the possibility to externally adjust an auto-recovery timer duration.The controller architecture is arranged to authorize a transient peak power excursion when the peak current hits the limit. At this point, the switching frequency is increased from 65 kHz to 130 kHz until the peak requirement disappears. The timer duration is then modulated as the converter crosses a peak power excursion mode (long) or undergoes a short circuit (short).

Evaluation/Development Tool Information
ProductStatusComplianceShort DescriptionParts Used
NCP1255PRNGEVBActivePb-free15 W NOM 40 W PK Adapter Evaluation BoardNCP1255BD65R2G
Technical Documents
TypeDocument TitleDocument ID/SizeRev
Eval Board: BOMNCP1255PRNGEVB Bill of Materials ROHS CompliantNCP1255PRNGEVB_BOM_ROHS.PDF - 72 KB1
Eval Board: GerberNCP1255PRNGEVB Gerber Layout Files (Zip Format)NCP1255PRNGEVB_GERBER.ZIP - 268.0 KB0
Eval Board: SchematicNCP1255PRNGEVB SchematicNCP1255PRNGEVB_SCHEMATIC.PDF - 43.0 KB0
Eval Board: Test ProcedureNCP1255PRNGEVB Test ProcedureNCP1255PRNGEVB_TEST_PROCEDURE.PDF - 696.0 KB0
Eval BoardsNCP1255 25 W Evaluation Board User's ManualEVBUM2160/D - 575.0 KB0
VideoPower Supply Solutions with NCP1255PRNGEVB Evaluation BoardTND6056/D1
NCP1255PRNGEVB BOM ROHS NCP1255PRNGEVB
NCP1255PRNGEVB GERBER NCP1255PRNGEVB
NCP1255PRNGEVB SCHEMATIC NCP1255PRNGEVB
NCP1255PRNGEVB TEST PROCEDURE NCP1255PRNGEVB
EVBUM2160/D - 575 NCP1255PRNGEVB
NCP1255PRNGEVB