Overview
The NCP1342AMDCDD1R2G, produced by onsemi, is a highly integrated quasi-resonant flyback controller designed for high-performance off-line power converters. This controller is particularly suited for applications requiring low parts count and cost effectiveness, such as AC-DC adapters, open-frame power supplies, and other similar devices. It features an integrated active X2 capacitor discharge capability, enabling no-load power consumption below 30 mW. The NCP1342 also incorporates proprietary valley-lockout circuitry for stable valley switching and transitions to frequency foldback mode to reduce switching losses at light loads. Additionally, it includes quiet-skip mode to manage power delivery while minimizing acoustic noise.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| High Voltage Startup Circuit Input Voltage | VHV(MAX) | -0.3 | 700 | V | |
| Supply Input Voltage | VCC(MAX) | -0.3 | 30 | V | |
| Supply Input Current | ICC(MAX) | 30 | mA | ||
| Driver Maximum Voltage | VDRV | -0.3 | VDRV(high) | V | |
| Driver Maximum Current (Source/Sink) | IDRV(SRC)/IDRV(SNK) | 500/800 | mA | ||
| Operating Junction Temperature | TJ | -40 | 125 | °C | |
| Maximum Junction Temperature | TJ(MAX) | 150 | °C | ||
| Minimum Frequency Clamp | fMIN | 21.5 | 25 | 27.0 | kHz |
Key Features
- Integrated High-Voltage Startup Circuit with Brownout Detection
- Integrated X2 Capacitor Discharge Capability
- Wide VCC Range from 9 V to 28 V
- Valley Switching Operation with Valley-Lockout for Noise-Free Operation
- Frequency Foldback with 25 kHz Minimum Frequency Clamp for Increased Efficiency at Light Loads
- Rapid Frequency Foldback for Fast Reduction of Switching Frequency at Light Loads
- Skip Mode with Quiet-Skip Technology for Highest Performance During Light Loads
- Minimized Current Consumption for No Load Power Below 30 mW
- Frequency Jittering for Reduced EMI Signature
- Latching or Auto-Recovery Timer-Based Overload Protection
- Adjustable Overpower Protection (OPP)
- Adjustable Maximum Frequency Clamp
- Fault Pin for Severe Fault Conditions, NTC Compatible for OTP
Applications
- Medium or High Power AC-DC Adapters
- Ultra High Density AC-DC Adapters
- USB PD Compliant Adapters
- Notebook Adapters
- Flat TV SMPS
- Computer Power Supplies
- Phone and Tablet Adapters
Q & A
- What is the NCP1342AMDCDD1R2G used for?
The NCP1342AMDCDD1R2G is used for designing high-performance off-line power converters, particularly in applications such as AC-DC adapters, open-frame power supplies, and other similar devices.
- What is the no-load power consumption of the NCP1342?
The NCP1342 can enable no-load power consumption below 30 mW.
- What protective features does the NCP1342 include?
The NCP1342 includes internal brownout detection, non-dissipative Over Power Protection (OPP), latched overvoltage protection, NTC-ready overtemperature protection, and line removal detection.
- What is the operating junction temperature range of the NCP1342?
The operating junction temperature range is from -40°C to 125°C.
- What is the minimum frequency clamp of the NCP1342?
The minimum frequency clamp is between 21.5 kHz and 27.0 kHz.
- Does the NCP1342 have any EMI reduction features?
Yes, the NCP1342 features frequency jittering to reduce the EMI signature.
- What is the purpose of the valley-lockout circuitry in the NCP1342?
The valley-lockout circuitry ensures stable valley switching and transitions to frequency foldback mode to reduce switching losses at light loads.
- How does the NCP1342 manage power delivery at light loads?
The NCP1342 enters quiet-skip mode to manage power delivery while minimizing acoustic noise at light loads.
- What is the maximum driver current of the NCP1342?
The maximum driver current is 500 mA (source) and 800 mA (sink).
- Is the NCP1342 compatible with NTC for overtemperature protection?
Yes, the NCP1342 is NTC compatible for overtemperature protection through a dedicated pin.
