Overview
The NCP1340B7D1R2G is a highly integrated quasi-resonant flyback controller produced by onsemi. It is designed for high-performance off-line power converters, offering advanced features such as valley-lockout switching, frequency foldback, and quiet-skip mode to optimize efficiency across various load conditions. The controller includes an integrated active X2 capacitor discharge feature, which helps in reducing no-load power consumption to below 30 mW. This makes it an ideal choice for applications requiring low standby power and high efficiency.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| High Voltage Startup Circuit Input Voltage (VHV) | -0.3 | - | 700 | V |
| Supply Input Voltage (VCC) | -0.3 | - | 30 | V |
| Supply Input Current (ICC) | - | - | 30 | mA |
| Operating Junction Temperature (TJ) | -40 | - | 125 | °C |
| Maximum Junction Temperature (TJ(MAX)) | - | - | 150 | °C |
| Driver Maximum Voltage (VDRV) | -0.3 | - | VDRV(high) | V |
| Driver Maximum Current (IDRV) | - | - | 500/800 | mA |
| Minimum Operating Voltage (VCC) | - | 9 | - | V |
| Brownout Start/Stop Levels | 112/98 | - | - | V |
| Overvoltage Protection (VCC OVP) | - | - | 28 | V |
Key Features
- Integrated High-Voltage Startup Circuit with Brownout Detection: Ensures reliable startup and shutdown based on input voltage levels.
- Integrated X2 Capacitor Discharge Capability: Automatically discharges X2 capacitors to meet IEC60950 standards and reduce standby power consumption.
- Valley Switching Operation with Valley-Lockout: Optimizes efficiency by synchronizing MOSFET turn-on with the valley of the drain-source voltage.
- Frequency Foldback and Quiet-Skip Mode: Reduces switching losses and acoustic noise at light loads.
- Non-Dissipative Over Power Protection (OPP): Limits maximum output power regardless of input voltage.
- Internal Temperature Shutdown and Overtemperature Protection: Protects the device from overheating using a dedicated pin compatible with NTC thermistors.
- Abnormal Overcurrent Fault Protection: Detects and protects against winding short circuits or saturation.
- Adjustable Overpower Protection (OPP) and Maximum Frequency Clamp: Allows for customizable protection and frequency management.
- Frequency Jittering for Reduced EMI Signature: Minimizes electromagnetic interference.
- Latching or Auto-Recovery Timer-Based Overload Protection: Provides flexible protection mechanisms against overload conditions.
Applications
The NCP1340B7D1R2G is suitable for a wide range of high-performance off-line power converter applications, including:
- Consumer electronics power supplies
- Industrial power supplies
- LED lighting power supplies
- Medical equipment power supplies
- Telecommunication power supplies
Its features make it particularly useful in applications requiring high efficiency, low standby power, and robust protection mechanisms.
Q & A
- What is the primary function of the NCP1340B7D1R2G?
The NCP1340B7D1R2G is a quasi-resonant flyback controller designed for high-performance off-line power converters.
- What is the significance of the integrated X2 capacitor discharge feature?
The integrated X2 capacitor discharge feature ensures that the X2 capacitors are discharged automatically, reducing standby power consumption and complying with IEC60950 standards.
- How does the valley-lockout circuitry improve efficiency?
The valley-lockout circuitry ensures stable valley switching by synchronizing the MOSFET turn-on with the minimum drain-source voltage, optimizing efficiency.
- What are the key protective features of the NCP1340B7D1R2G?
The device includes internal brownout detection, non-dissipative over power protection (OPP), latched overvoltage protection, and overtemperature protection through a dedicated pin.
- How does the frequency foldback and quiet-skip mode operate?
These modes reduce switching losses and acoustic noise at light loads by transitioning to frequency foldback and quiet-skip operation as the load decreases.
- What is the maximum operating junction temperature of the NCP1340B7D1R2G?
The maximum operating junction temperature is 125°C.
- What types of applications is the NCP1340B7D1R2G suitable for?
It is suitable for consumer electronics, industrial, LED lighting, medical equipment, and telecommunication power supplies.
- How does the device manage overcurrent faults?
The device implements abnormal overcurrent fault protection, detecting and protecting against winding short circuits or saturation.
- What is the purpose of the dedicated fault input pin?
The dedicated fault input pin can sense overvoltage conditions and latch off the controller or disable it based on overtemperature protection thresholds.
- How does the device reduce electromagnetic interference (EMI)?
The device uses frequency jittering to minimize the EMI signature.
