NCP1361 Datasheet, PDF (1/26 Pages) ON Semiconductor – Low Power Offline Constant Current PWM Current-Mode Controller

NCP1361, NCP1366
Low Power Offline Constant
Current PWM Current-Mode
Controller with/without
High Voltage Startup
Current Source
www.onsemi.com
The NCP1361/66 offers a new solution targeting output power
levels from a few watts up to 20 W in a universal−mains flyback
application. Due to a novel method this new controller offers a
primary−side constant current control, saving secondary−side
components to perform current regulation.
The NCP1361/66 operates in valley−lockout quasi−resonant peak
current mode control mode at nominal load to provide high efficiency.
When the secondary−side power starts diminishing, the switching
frequency naturally increases until a voltage−controlled oscillator
(VCO) takes the lead, synchronizing the MOSFET turn−on in a
drain−source voltage valley. The frequency is thus reduced by
stepping into successive valleys until the number 4 is reached. Beyond
this point, the frequency is linearly decreased in valley−switching
mode until a minimum is hit. Valley lockout during the first four
drain−source valleys prevents erratic discrete jumps and provides
good efficiency in lighter load situations.
SOIC−7
CASE 751U
MARKING
DIAGRAMS
8
XXXXX
ALYWX
G
1
TSOP−6
CASE 318G
1
xxxAYWG
G
1
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W, WW = Work Week
G
= Pb−Free Package
Features
• ±10% Current Regulation
• 560 V Startup Current Source
• No Frequency Clamp, 80 or 110 kHz Maximum Switching
Frequency Options
• Quasi−Resonant Operation with Valley Switching
Operation
• Fixed Peak Current & Deep Frequency Foldback @
Light Load Operation.
• External Constant Voltage Feedback Adjustment
• Cycle by Cycle Peak Current Limit
• Built−In Soft−Start
• Over & Under Output Voltage Protection
• Wide Operation V_CC Range (up to 28 V)
• Low Start−up Current (2.5 mA typ.) with NCP1361
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information on page 24 of
this data sheet.
• Clamped Gate−drive Output for MOSFET
• CS & Vs/ZCD pin Short and Open Protection
• Internal Temperature Shutdown
• Less than 30 mW No−Load Performance at High Line
with NCP1366 Version
• These are Pb−Free Devices
Typical Applications
• Low power ac−dc Adapters for Chargers.
• Ac−dc USB chargers for Cell Phones, Tablets and
Cameras
© Semiconductor Components Industries, LLC, 2015
1
October, 2015 − Rev. 1
Publication Order Number:
NCP1361/D