NCP1219BD100R2G
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| Part Number | NCP1219BD100R2G |
|---|---|
| Manufacturer |
 ON Semiconductor
|
| Description | The NCP1219BD100R2G is a high-performance current-mode PWM controller from onsemi, developed for offline AC-DC power supplies and isolated flyback converter applications. Combining a high-voltage startup circuit, adjustable skip-mode operation, current-mode regulation, and comprehensive fault protection, the device provides an efficient and cost-effective control solution for compact switched-mode power supplies. The NCP1219BD100R2G operates at a fixed 100kHz switching frequency, providing a practical balance between power conversion efficiency, magnetic component size, and switching losses. Its current-mode control architecture simplifies feedback-loop compensation while providing fast response to changing input voltage and output load conditions. An integrated high-voltage startup FET allows the controller to start directly from the high-voltage input rail without requiring a conventional lossy startup resistor network. This architecture helps reduce standby power consumption and improves overall efficiency, particularly in applications that must comply with stringent no-load and standby energy requirements. The device incorporates an adjustable skip-mode function that reduces switching activity during light-load conditions. By entering skip operation when the load decreases, the controller minimizes unnecessary switching losses and enables excellent standby power performance while maintaining regulated output voltage. The NCP1219BD100R2G features a 9.9V to 20V VCC operating range with a typical startup threshold of approximately 12.7V. Its output driver is designed to control an external power MOSFET, giving designers flexibility to select the appropriate switching transistor according to the required output power, input voltage, and thermal performance. Advanced protection functions include timer-based overload detection, overvoltage protection, overtemperature shutdown, current limiting, and external fault latch capability. The NCP1219B version incorporates auto-recovery protection, allowing the converter to periodically attempt a restart following applicable fault conditions instead of requiring manual power cycling. Internal frequency jittering spreads switching energy across a wider frequency spectrum, helping reduce electromagnetic interference and simplifying EMI filter design. Integrated ramp compensation also improves control-loop stability, particularly in flyback converters operating at higher duty cycles. The controller supports a maximum duty cycle of approximately 80% and is designed for a junction temperature range of -40°C to +150°C. These characteristics make it suitable for demanding consumer, industrial, and auxiliary power applications requiring reliable operation over a broad temperature range. Packaged in a compact SOIC-7 surface-mount package, the NCP1219BD100R2G reduces PCB area and external component requirements while providing the essential control and protection functions required for modern offline switching power supplies. The NCP1219BD100R2G is widely used in AC-DC adapters, auxiliary power supplies, isolated flyback converters, industrial power supplies, consumer electronics, set-top boxes, networking equipment, appliance power supplies, standby power circuits, battery chargers, embedded power systems, and general-purpose switched-mode power supply applications requiring efficient current-mode PWM control. |
| Product Group | Converter |
| MOQ | pcs |
| SPQ | 2500 pcs |
| Figure/Case | SOIC-7 |
| Package | 2500 Pack |
 PDF Datasheet | |
| Ship From | Hong Kong |
| Shipment Way | DHL / Fedex / TNT / UPS / Others |
| Delivery Term | Ex-Works |
| Send RFQ | sales@signalhk.com |
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NCP1219BD100R2G
NCP1219BD100R2G