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Onsemi NCP1361
Low Power Offline Constant Current PWM Current-Mode Controller with/without High Voltage Startup Current Source
Overview
| Topology | Flyback Converter |
| Input voltage | 90-375 V |
| Switching frequency | 80-110 kHz |
| Output 1 | 20 V / 4.5 A |
| IC revision | 1 |
Description
The NCP1361/66 offers a new solution targeting output powerlevels from a few watts up to 20 W in a universal−mains flybackapplication. Due to a novel method this new controller offers aprimary−side constant current control, saving secondary−sidecomponents to perform current regulation.The NCP1361/66 operates in valley−lockout quasi−resonant peakcurrent mode control mode at nominal load to provide high efficiency.When the secondary−side power starts diminishing, the switchingfrequency naturally increases until a voltage−controlled oscillator(VCO) takes the lead, synchronizing the MOSFET turn−on in adrain−source voltage valley. The frequency is thus reduced bystepping into successive valleys until the number 4 is reached. Beyondthis point, the frequency is linearly decreased in valley−switchingmode until a minimum is hit. Valley lockout during the first fourdrain−source valleys prevents erratic discrete jumps and providesgood efficiency in lighter load situations
Features
±10% Current Regulation
- 560 V Startup Current Source
- No Frequency Clamp, 80 or 110 kHz Maximum SwitchingFrequency Options
- Quasi−Resonant Operation with Valley SwitchingOperation
- 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 VCC Range (up to 28 V)
- Low Start−up Current (2.5 A typ.) with NCP1361
- 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 Linewith NCP1366 Version
- These are Pb−Free Devices
Typical applications
- Ac−dc USB chargers for Cell Phones, Tablets and camera
- Low power ac−dc Adapters for Chargers.
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IR(A) | ISAT,10%(A) | RDC max.(Ω) | fres(MHz) | Version | C | VR(V (DC)) | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | DF(%) | Pitch(mm) | Ø D(mm) | L(mm) | Packaging | Interface Type | Type | Variant | Gender | Pins | Mount | Working Voltage(V (AC)) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-TI Radial Leaded Wire Wound Inductor, 1 µH, 8.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | Inductance1 µH | Rated Current8.5 A | Saturation Current @ 10%8.5 A | DC Resistance0.015 Ω | Self Resonant Frequency140 MHz | VersionHeat Shrinking Tube | – | – | – | – | – | – | – | – | Length6 mm | – | – | – | – | – | – | MountTHT | – | ||||
| WE-TI Radial Leaded Wire Wound Inductor, 220 µH, 0.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | Inductance220 µH | Rated Current0.5 A | Saturation Current @ 10%0.57 A | DC Resistance1.2 Ω | Self Resonant Frequency4.8 MHz | VersionHeat Shrinking Tube | – | – | – | – | – | – | – | – | Length6 mm | – | – | – | – | – | – | MountTHT | – | ||||
 | WCAP-PTG5 Aluminum Polymer Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-PTG5 Aluminum Polymer Capacitors | – | – | – | – | – | – | Capacitance330 µF | Rated Voltage16 V (DC) | Endurance 2000 | Ripple Current4500 mA | Leakage Current528 µA | Dissipation Factor8 % | Pitch3.5 mm | Diameter8 mm | Length8 mm | PackagingAmmopack | – | – | – | – | – | MountRadial THT | – | ||||
 | WR-USB Standard Connectors, –, 1.5 A | Simulation– | Downloads6 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-USB Standard Connectors | – | Rated Current1.5 A | – | – | – | – | – | – | – | – | – | – | – | – | – | PackagingTape and Reel & Mylar | Interface TypeType A | TypeHorizontal - Short Type | Variantwith Clips | GenderReceptacle | Pins4 | MountTHT | Working Voltage30 V (AC) | ||
750315544 | Offline Transformer, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Offline Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |