Catalog
High Voltage Switching Regulator for Offline SMPS
Key Features
• 650 V Avalanche Rated MOSFET
• FixedFrequency 65 or 100 kHz CurrentMode Control Operation
• Frequency Foldback Down to 26 kHz and SkipCycle in Light Load Conditions
• Adjustable Current Limit with External Resistor
• 50 ms Timer-Based Auto-Recovery Short-Circuit Protection
• Frequency Jittering in Normal and Frequency Foldback Modes
• Option for Auto-Recovery or Latched Short-Circuit Protection
• Less than 100 mW Standby Power at High Line
Description
AI
The NCP1126 products integrates a fixed−frequency peak current mode controller with a low on− resistance high voltage, 650 V MOSFET. Available in a PDIP−7 package, the NCP1126 offers a high level of integration, including soft−start, frequency−jittering, short−circuit protection, thermal shutdown protection, frequency foldback mode and skip−cycle to reduce power consumption in light load condition, peak current mode control with adjustable internal ramp compensation and adjustable peak current set point. During nominal load operation, the part switches at one of the available frequencies (65 or 100 kHz). When the output power demand diminishes, the IC automatically enters frequency foldback mode and provides excellent efficiency at light loads. When the power demand reduces further, it enters into a skip mode to reduce the standby consumption down to no load condition. Protection feature include: a timer to detect an overload or a short−circuit event with auto−recovery or latch protection, and a built−in VCC overvoltage protection.The switcher also provides a jittered 65 kHz or 100 kHz switching frequency to improve the EMI.
