NCP4355: Secondary Side Controller, SMPS Off Mode, for Low Standby Power Adapters

The NCP4355 is a secondary side SMPS controller designed for use in applications which require extremely low no load power consumption. The device is capable of detecting no load conditions and entering the power supply into a low consumption OFF mode. During OFF mode, the primary side controller is turned off and energy is provided by the output capacitors thus eliminating the power consumption required to maintain regulation. During OFF mode, the output voltage relaxes and is allowed to decrease to an adjustable level. Once more energy is required, the NCP4355 automatically restarts the primary side controller by ONOFF current that flows through ONOFF optocoupler. The NCP4355 controls the primary controller with an Active ON signal, meaning that it only drives optocoupler current during ON mode to minimize consumption during OFF mode.

Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
Secondary Side SMPS OFF Mode Controller for Low Standby PowerNCP4355/D (197.0kB)1
Package Drawings (1)
Document TitleDocument ID/SizeRevision
SOIC-8 Narrow Body751-07 (62.6kB)AK
Evaluation Board Documents (9)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1249AD65GEVB Bill of Materials ROHS CompliantNCP1249AD65GEVB_BOM_ROHS (191kB)0
NCP1249AD65GEVB Evaluation Board User's ManualEVBUM2221/D (1368kB)0Apr, 2014
NCP1249AD65GEVB Gerber Layout Files (Zip Format)NCP1249AD65GEVB_GERBER (85kB)0
NCP1249AD65GEVB SchematicNCP1249AD65GEVB_SCHEMATIC (186kB)0
NCP1249AD65GEVB Test ProcedureNCP1249AD65GEVB_TEST_PROCEDURE (108kB)0
NCP1937BADAPGEVB Bill of Materials ROHS CompliantNCP1937BADAPGEVB_BOM_ROHS.PDF (290kB)2
NCP1937BADAPGEVB Gerber Layout Files (Zip Format)NCP1937BADAPGEVB_GERBERS.ZIP (135kB)2
NCP1937BADAPGEVB SchematicNCP1937BADAPGEVB_SCHEMATIC.PDF (366kB)2
NCP1937BADAPGEVB Test ProcedureNCP1937BADAPGEVB_TEST_PROCEDURE.PDF (156.0kB)0
Evaluation/Development Tool Information
ProductStatusComplianceShort Description
NCP1249AD65GEVBActivePb-free65 W Adapter<10 MW No Load Standby Evaluation Board
NCP1937BADAPGEVBActivePb-free90 W Adapter PFC+QR 10 MW Evaluation Board
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
NCP4355ADR2GActivePb-free Halide freeSOIC-8751-071Tape and Reel2500$0.21
NCP4355BDR2GActivePb-free Halide freeSOIC-8751-071Tape and Reel2500$0.28
NCP4355CDR2GActivePb-free Halide freeSOIC-8751-071Tape and Reel2500$0.21
Specifications
ProductVCC Max (V)Vref Typ (V)ICC Max (A)TA Min (°C)TA Max (°C)
NCP4355ADR2G361.250.000135-40125
NCP4355BDR2G361.250.000135-40125
NCP4355CDR2G361.250.000135-40125
Secondary Side SMPS OFF Mode Controller for Low Standby Power (197.0kB) NCP4355
NCP1249AD65GEVB BOM ROHS - 191 KB NCP1249AD65GEVB
EVBUM2221/D - 1368 KB NCP1249AD65GEVB
NCP1249AD65GEVB GERBER - 85 KB NCP1249AD65GEVB
NCP1249AD65GEVB SCHEMATIC - 186 KB NCP1249AD65GEVB
NCP1249AD65GEVB TEST PROCEDURE - 108 KB NCP1249AD65GEVB
NCP1937BADAPGEVB BOM ROHS NCP1937BADAPGEVB
NCP1937BADAPGEVB GERBERS NCP1937BADAPGEVB
NCP1937BADAPGEVB SCHEMATIC NCP1937BADAPGEVB
NCP1937BADAPGEVB TEST PROCEDURE NCP1937BADAPGEVB
SOIC-8 Narrow Body CM1216