NCP1361, NCP1366 Low Power Offline Constant Current PWM Current-Mode Controller with/without High Voltage Startup www.onsemi.com Current Source The NCP1361/66 offers a new solution targeting output power MARKING levels from a few watts up to 20 W in a universalmains flyback DIAGRAMS application. Due to a novel method this new controller offers a 8 primary side constant current control, saving secondary side SOIC7 XXXXX CASE 751U components to perform current regulation. ALYWX The NCP1361/66 operates in valleylockout quasiresonant peak 1 current mode control mode at nominal load to provide high efficiency. When the secondaryside power starts diminishing, the switching frequency naturally increases until a voltagecontrolled oscillator TSOP6 xxxAYW CASE 318G (VCO) takes the lead, synchronizing the MOSFET turnon in a 1 drainsource voltage valley. The frequency is thus reduced by 1 stepping into successive valleys until the number 4 is reached. Beyond A = Assembly Location this point, the frequency is linearly decreased in valleyswitching L = Wafer Lot mode until a minimum is hit. Valley lockout during the first four Y = Year drainsource valleys prevents erratic discrete jumps and provides W = Work Week good efficiency in lighter load situations. = PbFree Package (Note: Microdot may be in either location) Features 10% Current Regulation ORDERING INFORMATION 560 V Startup Current Source See detailed ordering and shipping information on page 25 of No Frequency Clamp, 80 or 110 kHz Maximum Switching this data sheet. Frequency Options QuasiResonant Operation with Valley Switching Clamped Gatedrive Output for MOSFET Operation CS & Vs/ZCD pin Short and Open Protection Fixed Peak Current & Deep Frequency Foldback Internal Temperature Shutdown Light Load Operation. Less than 30 mW NoLoad Performance at High Line External Constant Voltage Feedback Adjustment with NCP1366 Version Cycle by Cycle Peak Current Limit These are PbFree Devices BuiltIn SoftStart Typical Applications Over & Under Output Voltage Protection Low power acdc Adapters for Chargers Wide Operation V Range (up to 28 V) CC Acdc USB chargers for Cell Phones, Tablets and Low Startup Current (2.5 A typ.) with NCP1361 Cameras Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: February, 2018 Rev. 3 NCP1361/DNCP1361, NCP1366 NCP1361 NCP1366 V /ZCD 1 8 HV S V V /ZCD CC 1 6 S FB 2 2 5FB GND CS 3 6 V CC DRV 3 4 CS DRV45 GND (Top View) (Top View) Figure 1. Pin Connections 2 0 Ac Vout Ac Prim 3 0 Sec 5 Aux 4 1 NCP1366 5 4 GND DRV 6 3 VCC CS 2 FB 8 1 HV Vs/ZCD 0 Figure 2. NCP1366 Typical Application Circuit 2 0 Ac Vout Ac Prim 3 0 Sec 5 Aux NCP1361 4 3 4 1 CS DRV 5 2 FB GND 6 1 Vs/ZCD VCC 0 Figure 3. NCP1361 Typical Application Circuit www.onsemi.com 2