onsemi NCP1340A6DR2G

The NCP1340 implements a quasi−resonant flyback converter utilizing current−mode architecture where the switch−off event is dictated by the peak current. This IC is an ideal candidate where low parts count and cost effectiveness are the key parameters, particularly in ac−dc adapters, open−frame power supplies, etc. The NCP1340 incorporates all the necessary components normally needed in modern power supply designs, bringing several enhancements such as non−dissipative overpower protection (OPP), brownout protection, and frequency reduction management for optimized efficiency over the entire power range. Accounting for the needs of extremely low standby power requirements, the controller features minimized current consumption and includes an automatic X2 capacitor discharge circuit that eliminates the need to install power−consuming resistors across the X2 input capacitors.

• 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 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)
• Fixed or Adjustable Maximum Frequency Clamp
• Fault Pin for Severe Fault Conditions, NTC Compatible for OTP
• 4 ms Soft−Start Timer

• ac−dc adapters
• open−frame power supplies