Overview
The NCP1342ANACCED1R2G, produced by onsemi, is a highly integrated quasi-resonant flyback controller designed for high-performance off-line power converters. This IC is particularly suited for applications requiring low parts count and cost effectiveness, such as ac-dc adapters and open-frame power supplies. The NCP1342 features an integrated active X2 capacitor discharge capability, enabling no-load power consumption below 30 mW. It also incorporates proprietary valley-lockout circuitry for stable valley switching and transitions to frequency foldback and quiet-skip modes to optimize efficiency and minimize acoustic noise at light loads.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| High Voltage Startup Circuit Input Voltage (VHV) | -0.3 | - | 700 | V |
| Supply Input Voltage (VCC) | -0.3 | - | 30 | V |
| Minimum Operating Voltage (VCC) | 9.0 | 9.5 | - | V |
| VCC Overvoltage Protection Threshold (VCC(OVP)) | 27 | 28 | 29 | V |
| Driver Maximum Voltage (VDRV) | -0.3 | - | VDRV(high) | V |
| Driver Maximum Current (IDRV) | - | - | 500 (SRC), 800 (SNK) | mA |
| Operating Junction Temperature (TJ) | -40 | - | 125 | °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
- 28 V VCC Overvoltage Protection
- Abnormal Overcurrent Fault Protection for Winding Short Circuit or Saturation Detection
- Internal Temperature Shutdown
- 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
The NCP1342ANACCED1R2G is ideal for various high-performance off-line power converter applications, including:
- AC-DC Adapters
- Open-Frame Power Supplies
- Consumer Electronics Power Supplies
- Industrial Power Supplies
- Telecom Power Supplies
Q & A
- What is the primary function of the NCP1342ANACCED1R2G?
The NCP1342ANACCED1R2G is a quasi-resonant flyback controller designed for high-performance off-line power converters.
- What is the no-load power consumption of the NCP1342ANACCED1R2G?
The no-load power consumption is below 30 mW.
- What is the operating voltage range of the NCP1342ANACCED1R2G?
The operating voltage range is from 9 V to 28 V.
- What protective features does the NCP1342ANACCED1R2G include?
The IC includes internal brownout detection, non-dissipative Over Power Protection (OPP), latched overvoltage protection, and NTC-ready overtemperature protection.
- How does the NCP1342ANACCED1R2G manage light load conditions?
The IC uses Rapid Frequency Foldback and quiet-skip mode to manage power delivery and minimize acoustic noise at light loads.
- What is the purpose of the valley-lockout circuitry in the NCP1342ANACCED1R2G?
The valley-lockout circuitry ensures stable valley switching and transitions to frequency foldback mode to reduce switching losses.
- Does the NCP1342ANACCED1R2G have an integrated X2 capacitor discharge feature?
Yes, it has an integrated active X2 capacitor discharge capability.
- What is the maximum junction temperature of the NCP1342ANACCED1R2G?
The maximum junction temperature is 150°C.
- What are some common applications for the NCP1342ANACCED1R2G?
Common applications include AC-DC adapters, open-frame power supplies, consumer electronics power supplies, industrial power supplies, and telecom power supplies.
- Does the NCP1342ANACCED1R2G support frequency jittering for EMI reduction?
Yes, it includes frequency jittering to reduce the EMI signature.
- What is the purpose of the fault pin in the NCP1342ANACCED1R2G?
The fault pin is used for severe fault conditions and is NTC compatible for overtemperature protection.
