Overview
The NCP1361EABAYSNT1G, produced by onsemi, is a low power offline constant current PWM current-mode controller. This device is designed for universal-mains flyback applications, targeting output power levels from a few watts up to 20 W. It features primary-side constant current control, eliminating the need for secondary-side components to perform current regulation. The NCP1361 operates in valley-lockout quasi-resonant peak current mode control, ensuring high efficiency and smooth operation across various load conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Startup Current Sourced by VCC Pin | 70 | 100 | 150 | μA |
| VCC Level at Which Driving Pulses are Authorized | 16 | 18 | 20 | V |
| VCC Level at Which Driving Pulses are Stopped | 6.0 | 6.5 | 7.0 | V |
| Internal Latch / Logic Reset Level | - | - | 5.6 | V |
| Switching Frequency | - | 75-85 kHz | - | kHz |
| Output Current | -300 | - | 500 | mA |
| Thermal Shutdown Temperature | - | - | 150 | °C |
| Package Type | - | - | TSOP-6 | - |
Key Features
- Primary-side constant current control, eliminating the need for secondary-side components.
- Valley-lockout quasi-resonant peak current mode control for high efficiency.
- ±10% current regulation.
- 560 V startup current source (NCP1366 only).
- No frequency clamp, with 80 or 110 kHz maximum switching frequency options.
- Fixed peak current and deep frequency foldback at light load operation.
- External constant voltage feedback adjustment.
- Cycle by cycle peak current limit.
- Built-in soft-start.
- Over and under output voltage protection.
- Wide operation VCC range (up to 28 V).
- Low start-up current (2.5 μA typ. for NCP1361).
- Clamped gate-drive output for MOSFET.
- CS and Vs/ZCD pin short and open protection.
- Internal temperature shutdown.
- Less than 30 mW no-load performance at high line (NCP1366 version).
Applications
- Low power AC-DC adapters for chargers.
- AC-DC USB chargers for cell phones, tablets, and cameras.
Q & A
- What is the primary function of the NCP1361EABAYSNT1G?
The NCP1361EABAYSNT1G is a low power offline constant current PWM current-mode controller designed for universal-mains flyback applications.
- What are the output power levels supported by the NCP1361EABAYSNT1G?
The device supports output power levels from a few watts up to 20 W.
- What is the switching frequency range of the NCP1361EABAYSNT1G?
The switching frequency range is typically between 75-85 kHz.
- What kind of protection mechanisms does the NCP1361EABAYSNT1G have?
The device includes over and under output voltage protection, internal temperature shutdown, and CS and Vs/ZCD pin short and open protection.
- What is the startup current sourced by the VCC pin?
The startup current sourced by the VCC pin is typically 100 μA, with a range of 70-150 μA.
- What is the thermal shutdown temperature of the NCP1361EABAYSNT1G?
The thermal shutdown temperature is 150°C.
- What package type is the NCP1361EABAYSNT1G available in?
The device is available in a TSOP-6 package.
- What are some typical applications of the NCP1361EABAYSNT1G?
Typical applications include low power AC-DC adapters for chargers and AC-DC USB chargers for cell phones, tablets, and cameras.
- Does the NCP1361EABAYSNT1G have built-in soft-start capability?
Yes, the device has a built-in soft-start feature.
- How does the NCP1361EABAYSNT1G handle light load conditions?
The device features fixed peak current and deep frequency foldback at light load operation to maintain efficiency.
