NCP1366: Low Power Offline Constant Current PWM Current-Mode Controller with High Voltage Startup Current Source

The NCP1366 offers a new solution targeting output power levels from a few watts up to 20 W in a universal-mains flyback application. Thanks to a novel method this new controller saves the secondary feedback circuitry for constant current regulation while achieving excellent line and load regulation with traditional opto coupler and TL431 voltage reference. The NCP1366 operates in valley lockout quasi-resonant peak current mode control mode at high load to provide high efficiency. When the power on the secondary side starts to diminish, the controller automatically adjusts the duty-cycle then at lower load the controller enters in pulse frequency modulation at fixed peak current with a valley switching detection. This technique allows keeping the output regulation with tiny dummy load. Valley lockout at the first 4 valleys prevent valley jumping operation and then a valley switching at lower load provides high efficiency.

Features

560-V Startup Current Source
No frequency clamp, 80 or 110 kHz Maximum Switching Frequency
Quasi-Resonant with Valley Switching Operation
Fixed Peak Current & Deep frequency foldback @ light load operation
Wide Operation VCC range (up to 28 V)
Cycle by Cycle peak current limit
CS & Vs/ZCD pin Short and Open Protection
Internal Temperature Shutdown
Constant Current Primary-side feedback eliminates secondary controller
±10% Current Regulation
Clamped Gate-drive Output for Mosfet
Build-in soft-sart
Low Start-up current ( 2 μA typ.)
Less than 10 mW No-Load Performance at High Line with NCP1366 version
Less than 30 mW No-Load Performance at High Line with NCP1361 version
These are Pb-Free Devices

Benefits

Saves external HV FET or inefficient resistor divider
Prevent high frequency interference with a touchscreen
QR architecture offers high efficiency operation
Low light load consumption
Design flexibility
Safe operation
Safe operation
Safe operation

Applications

AC-DC USB chargers for cell phones, tablets, and other portable devices

End Products

AC-DC USB chargers for cell phones, tablets, and other portable devices

Design & Development Tools (1)

Document Title	Document ID/Size	Revision	Revision Date
NCP1360, NCP1361, NCP1365, NCP1366 Design Mathcad worksheet	NCP1360 Design Worksheet Mathcad (508kB)	2.1	Apr, 2015

Data Sheets (1)

Document Title	Document ID/Size	Revision	Revision Date
Low Power Offline Constant PWM Current-Mode Controler with/without High Voltage Startup Current Source	NCP1361/D (354kB)	2	Nov, 2016

Package Drawings (1)

Document Title	Document ID/Size	Revision
SOIC 7 CASE OUTLINE	751U (62.0kB)	E

Order Information

Product	Status	Compliance	Package		MSL*	Container		Budgetary Price/Unit
NCP1366AABAYDR2G	Active	Pb-free Halide free	SOIC-7	751U	1	Tape and Reel	2500	$0.22
NCP1366BABAYDR2G	Active	Pb-free Halide free	SOIC-7	751U	1	Tape and Reel	2500	$0.22
NCP1366BABCYDR2G	Obsolete	Pb-free Halide free	SOIC-7	751U	1	Tape and Reel	2500
NCP1366EABAYDR2G	Active	Pb-free Halide free	SOIC-7	751U	3	Tape and Reel	2500	$0.2933

Specifications

Product	Topology	Control Mode	fsw Typ (kHz)	Stand-by Mode	UVLO (V)	Short Circuit Protection	Latch	Soft Start	VCC Max (V)	Drive Cap. (mA)
NCP1366AABAYDR2G	Flyback	Current Mode	Variable	Yes	6.5	Yes	Yes	Yes	28	2000 / 1000
NCP1366BABAYDR2G	Flyback	Current Mode	Variable	Yes	6.5	Yes	Yes	Yes	28	2000 / 1000
NCP1366EABAYDR2G

Low Power Offline Constant PWM Current-Mode Controler with/without High Voltage Startup Current Source (354kB) NCP1361

NCP1360, NCP1361, NCP1365, NCP1366 Design Mathcad worksheet NCP1365

SOIC 7 CASE OUTLINE NCL30060