Overview
The NCP1342ANDAAD1R2G, 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. It features an integrated active X2 capacitor discharge capability, which helps in achieving no-load power consumption below 30 mW. The controller incorporates several advanced features to enhance efficiency and reliability, including proprietary valley-lockout circuitry, frequency foldback, and quiet-skip mode for managing power delivery at light loads.
Key Specifications
| Characteristics | 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 |
| Operating Junction Temperature | TJ | -40 | - | 125 | °C |
| Maximum Junction Temperature | TJ(MAX) | - | - | 150 | °C |
| Minimum Frequency Clamp | fMIN | 21.5 | 25 | 27.0 | kHz |
| VCC Overvoltage Protection Threshold | VCC(OVP) | 27 | 28 | 29 | V |
| Driver Maximum Voltage | VDRV | -0.3 | - | VDRV(high) | V |
| Driver Maximum Current (Source/Sink) | IDRV(SRC)/IDRV(SNK) | - | - | 500/800 | mA |
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 NCP1342ANDAAD1R2G is ideal for various high-performance off-line power converter applications, including:
- Ac-dc adapters
- Open-frame power supplies
- Other power supply designs where low parts count and cost effectiveness are critical
Q & A
- What is the primary function of the NCP1342ANDAAD1R2G?
The NCP1342ANDAAD1R2G is a quasi-resonant flyback controller designed for high-performance off-line power converters.
- What is the typical no-load power consumption of the NCP1342ANDAAD1R2G?
The NCP1342ANDAAD1R2G can achieve no-load power consumption below 30 mW.
- What is the operating voltage range of the VCC supply input?
The operating voltage range of the VCC supply input is from 9 V to 28 V.
- What protective features does the NCP1342ANDAAD1R2G include?
The NCP1342ANDAAD1R2G includes features such as internal brownout detection, overvoltage protection, overcurrent fault protection, internal temperature shutdown, and line removal detection.
- How does the NCP1342ANDAAD1R2G manage switching frequency at light loads?
The NCP1342ANDAAD1R2G uses Rapid Frequency Foldback and quiet-skip mode to manage the switching frequency at light loads, reducing switching losses and minimizing acoustic noise.
- What is the purpose of the valley-lockout circuitry in the NCP1342ANDAAD1R2G?
The valley-lockout circuitry ensures stable valley switching, working down to the 6th valley and transitioning to frequency foldback mode to reduce switching losses.
- How does the NCP1342ANDAAD1R2G handle X2 capacitor discharge?
The NCP1342ANDAAD1R2G has an integrated active X2 capacitor discharge capability, which safely discharges the X2 capacitors when the AC line is removed.
- What is the maximum junction temperature of the NCP1342ANDAAD1R2G?
The maximum junction temperature of the NCP1342ANDAAD1R2G is 150°C.
- What is the minimum frequency clamp of the NCP1342ANDAAD1R2G?
The minimum frequency clamp of the NCP1342ANDAAD1R2G is 25 kHz.
- Does the NCP1342ANDAAD1R2G support adjustable overpower protection?
Yes, the NCP1342ANDAAD1R2G supports adjustable overpower protection (OPP).
- What package types are available for the NCP1342ANDAAD1R2G?
The NCP1342ANDAAD1R2G is available in SOIC-8 and SOIC-9 packages.
