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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
- Low power ac−dc Adapters for Chargers.
- Ac−dc USB chargers for Cell Phones, Tablets and camera
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | L (µH) | IR (A) | ISAT (A) | RDC max. (Ω) | fres (MHz) | Version | Application | Interface Type | Type | Gender | Pins | Mount | IR (A) | Working Voltage (V (AC)) | Packaging | C | VR (V (DC)) | Endurance (h) | Operating Temperature | IRIPPLE (mA) | ILeak (µA) | DF (%) | Pitch (mm) | Ø D (mm) | L (mm) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 7447462010 | SPEC | 8 files | WE-TI Radial Leaded Wire Wound Inductor | 1 | 8.5 | 8 | 0.015 | 140 | Heat Shrinking Tube | – | – | – | – | – | THT | – | – | – | – | – | – | – | – | – | – | – | – | 6 | ||
| 7447462221 | SPEC | 8 files | WE-TI Radial Leaded Wire Wound Inductor | 220 | 0.5 | 0.5 | 1.2 | 4.8 | Heat Shrinking Tube | – | – | – | – | – | THT | – | – | – | – | – | – | – | – | – | – | – | – | 6 | ||
 | 870025374005 | SPEC | 7 files | WCAP-PTG5 Aluminum Polymer Capacitors | – | – | – | – | – | – | – | – | – | – | – | Radial THT | – | – | Ammopack | 330 µF | 16 | 2000 | -55 °C up to +105 °C | 4500 | 528 | 8 | 3.5 | 8 | 8 | ||
 | 614104150121 | SPEC | – | 7 files | WR-COM USB 2.0 Type A Horizontal THT Short Type | – | 1.5 | – | – | – | – | USB 2.0 | Type A | Horizontal - Short Type | Receptacle | 4 | THT | 1.5 | 30 | Tape and Reel & Mylar | – | – | – | -40 °C up to +85 °C | – | – | – | – | – | – | |
| 750315544 | SPEC | – | – | Offline Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 7447462010 | SPEC | |
| 7447462221 | SPEC | |
| 870025374005 | SPEC | |
| 614104150121 | SPEC | – |
| 750315544 | SPEC | – |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Product series | L (µH) | IR (A) | ISAT (A) | RDC max. (Ω) | fres (MHz) | Version | Application | Interface Type | Type | Gender | Pins | Mount | IR (A) | Working Voltage (V (AC)) | Packaging | C | VR (V (DC)) | Endurance (h) | Operating Temperature | IRIPPLE (mA) | ILeak (µA) | DF (%) | Pitch (mm) | Ø D (mm) | L (mm) | Samples |
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