NCP1200AP100

AC DC Converters, Offline Switchers Overview

The NCP1200AP100 is a PWM current-mode controller for universal off-line supplies featuring low standby power. It operates at a fixed switching frequency of 100 kHz with a maximum duty cycle of 83%. The device supports flyback and forward topologies, providing one output with a drive capability of 250 mA. It functions within an input voltage range of 11V to 16V and withstands a maximum operating temperature of 125°C. Housed in a PDIP-8 through-hole package, it integrates leading edge blanking and skip-cycle capabilities.

AC DC Converters, Offline Switchers Feature Summary

• Enables complete off-line AC-DC adapters and battery chargers with extremely low no-load standby power consumption.
• Features auto-recovery internal output short-circuit protection and internal temperature shutdown for enhanced reliability.
• Supports no auxiliary winding operation, allowing the circuit to be self-powered directly from the DC power line.
• Utilizes current-mode control with skip-cycle capability to minimize acoustic noise during light load conditions.

AC DC Converters, Offline Switchers Applications

• Universal off-line AC-DC adapters
• Battery chargers
• Switching mode power supplies (SMPS) requiring low standby power

AC DC Converters, Offline Switchers Procurement Notes

Verify component authenticity and datasheet revisions prior to integration. Confirm RoHS compliance status as historical records indicate non-compliance for this specific part number. Check for end-of-life notices or obsolescence warnings from onsemi before finalizing design-in decisions. Ensure supply chain availability aligns with production requirements given potential discontinuation risks.

AC DC Converters, Offline Switchers Selection Notes

Select this controller for designs prioritizing minimal standby power and simplified feedback loops via direct optocoupler connection. The integrated dynamic self-supply eliminates the need for auxiliary windings, reducing transformer complexity. Consider the 100 kHz fixed frequency and 250 mA drive strength when sizing external MOSFETs and passive components for the target application power level.

AC DC Converters, Offline Switchers Part Context

Part of the NCP1200 series, which represents a significant advancement in ultra-compact switch-mode power supplies. This family simplifies offline converter design by integrating timing elements, feedback circuits, and low-pass filters. The NCP1200A variant specifically enhances drive capability and reduces optocoupler current requirements compared to earlier iterations.

AC DC Converters, Offline Switchers Replacement Considerations

NCP1200P100G

AC DC Converters, Offline Switchers FAQ

How does the NCP1200AP100 achieve low standby power?

It utilizes a skip-cycle mode that automatically skips switching cycles when the output power demand decreases, maintaining high efficiency and low noise at light loads.

What is the purpose of the dynamic self-supply feature?

Dynamic self-supply allows the IC to be powered directly from the high-voltage DC line without requiring an auxiliary winding on the transformer, simplifying the design.