NCP1618DDR2G

Overview

The NCP1618DDR2G is a high-voltage, multi-mode power factor correction (PFC) controller manufactured by onsemi. It operates within a supply voltage range of 9.5V to 35V and supports a switching frequency of 65kHz in continuous conduction mode (CCM). The device is housed in a 10-SOP package with dimensions of 0.154 inches (3.90mm) width, featuring nine leads. It functions across an operating temperature range from -40°C to +125°C TJ. The controller integrates startup current capabilities of 1mA and includes comprehensive protection mechanisms such as overcurrent, overvoltage, brown-out, undervoltage lockout, and surge detection.

Feature Summary

• Multi-mode operation automatically transitions between critical conduction mode (CRM) and continuous conduction mode (CCM) based on switching cycle duration to optimize efficiency across line and load ranges.
• Integrates soft skip frequency folding and jitter features in CCM to minimize losses at very light loads and reduce electromagnetic interference.
• Includes built-in EMI filter capacitor (X2) discharge circuitry and a pfcOK signal for communication with downstream circuits.

Applications

• Offline power supplies requiring power factor correction
• 5G network communication power supplies
• ATX and gaming power supplies

Procurement Notes

Verify the specific suffix DDR2G against official datasheets to confirm pinout and electrical characteristics match design requirements. Ensure compliance with RoHS3 standards and check moisture sensitivity level (MSL 1) for handling procedures. Confirm availability through authorized distributors as lead times may vary.

Selection Notes

Select this component for applications demanding high efficiency across wide load ranges without complex external control loops. The integrated multi-mode capability simplifies design compared to single-mode controllers. Consider the SO-9 package size for compact board layouts and verify thermal management for high-temperature environments up to 125°C.

Part Context

Part of the NCP1618 series designed for high-performance PFC applications. It replaces older single-mode controllers by offering adaptive mode switching. The series targets modern efficiency standards like 80 Plus Gold, ensuring compliance with regulations such as EN61000-3-2 for input power above 75W.

Replacement Considerations

Direct substitutes include other variants within the NCP1618 family such as NCP1618BDR2G or NCP1618KDR2G, provided pin compatibility and specific mode configurations align with the original design intent.

FAQ

How does the NCP1618DDR2G manage efficiency at light loads?

It enters a soft skip frequency mode to minimize losses when operating under very light load conditions.

What protection features are integrated into the controller?

The device includes overcurrent protection (OCP), overvoltage protection (OVP), brown-out (BO), undervoltage lockout (BUV), and surge detection.