Overview
The NCP1380CDR2G, produced by onsemi, is a quasi-resonant current-mode controller designed for high-power universal off-line supplies. This controller is particularly well-suited for adapter applications, such as those in TVs, set-top boxes, and offline adapters for notebooks. It features a proprietary valley-lockout system that ensures stable operation by switching in the valley of the MOSFET drain-source voltage, thereby optimizing efficiency and reducing noise.
Key Specifications
| Symbol | Rating | Value | Unit |
|---|---|---|---|
| VCC(MAX) | Maximum Power Supply voltage, VCC pin, continuous voltage | -0.3 to 28 | V |
| ICC(MAX) | Maximum current for VCC pin | ±30 | mA |
| VDRV(MAX) | Maximum driver pin voltage, DRV pin, continuous voltage | -0.3 to 20 | V |
| IDRV(MAX) | Maximum current for DRV pin | ±1000 | mA |
| VMAX | Maximum voltage on low power pins (except pins DRV and VCC) | -0.3 to 10 | V |
| IMAX | Current range for low power pins (except pins ZCD, DRV and VCC) | ±10 | mA |
| IZCD(MAX) | Maximum current for ZCD pin | +3 / -2 | mA |
| RJA | Thermal Resistance Junction-to-Air | 120 | °C/W |
| TJ(MAX) | Maximum Junction Temperature | 150 | °C |
| Operating Temperature Range | -40 to +125 | °C | |
| Storage Temperature Range | -60 to +150 | °C | |
| ESD Capability, HBM Model | 4 kV |
Key Features
- Quasi-Resonant Peak Current-Mode Control Operation
- Valley Switching Operation with Valley-Lockout for Noise-Immune Operation
- Frequency Foldback at Light Load to Improve the Light Load Efficiency
- Adjustable Over Power Protection
- Auto-Recovery or Latched Internal Output Short-Circuit Protection
- Fixed Internal 80 ms Timer for Short-Circuit Protection
- Combined Overvoltage and Overtemperature Protection (Versions A and B)
- Combined Overvoltage Protection and Brown-Out (Versions C and D)
- +500 mA/-800 mA Peak Current Source/Sink Capability
- Internal Temperature Shutdown
- Direct Optocoupler Connection
- Extended VCC Range Operation Up to 28 V
- Extremely Low No-Load Standby Power
- SO-8 Package
- Pb-Free and RoHS Compliant
Applications
- High Power ac-dc Converters for TVs, Set-Top Boxes, etc.
- Offline Adapters for Notebooks
Q & A
- What is the NCP1380CDR2G used for? The NCP1380CDR2G is used for high-power universal off-line supplies, particularly in adapter applications such as TVs, set-top boxes, and offline adapters for notebooks.
- What is the key feature of the valley-lockout system in the NCP1380CDR2G? The valley-lockout system ensures stable operation by switching in the valley of the MOSFET drain-source voltage, optimizing efficiency and reducing noise.
- What types of protection does the NCP1380CDR2G offer? The NCP1380CDR2G offers Over Power Protection (OPP), combined overvoltage and overtemperature protection (Versions A and B), combined overvoltage protection and brown-out (Versions C and D), and internal temperature shutdown.
- How does the frequency foldback mode work in the NCP1380CDR2G? In frequency foldback mode, the peak current decreases down to 17.5% of its maximum value and is then frozen. The switching frequency is variable and decreases as the output load decreases.
- What is the maximum junction temperature for the NCP1380CDR2G? The maximum junction temperature is 150°C.
- Is the NCP1380CDR2G Pb-Free and RoHS compliant? Yes, the NCP1380CDR2G is Pb-Free and RoHS compliant.
- What is the maximum power supply voltage for the VCC pin? The maximum power supply voltage for the VCC pin is 28 V.
- How does the short-circuit protection work in the NCP1380CDR2G? The short-circuit protection involves an internal timer and a comparator that senses the CS signal. If the fault persists, the controller stops the pulses, either latching off (Versions A and C) or entering auto-recovery mode (Versions B and D).
- What is the purpose of the Time Out function in the NCP1380CDR2G? The Time Out function acts as a substitute clock to ensure the controller continues normal operation even if the ZCD comparator fails to detect valleys due to extremely damped free oscillations.
- How does the soft-start duration work in the NCP1380CDR2G? During soft-start, the time-out duration is extended to 40 μs to ensure the transformer is fully demagnetized before the MOSFET is turned on.
