NCP1249AD65R2G

AC DC Converters, Offline Switchers Overview

The NCP1249AD65R2G is an offline switching controller designed for flyback topologies. It operates at a fixed 65 kHz switching frequency with a maximum duty cycle of 80%. The device supports a supply voltage range of 10 V to 30 V and features an 18 V startup threshold. Packaged in a 9-lead SOIC (SOIC-9) surface-mount case, it integrates comprehensive fault protection including overload, over-power, over-temperature, over-voltage, and short-circuit safeguards. The component functions within a junction temperature range of -40°C to 125°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates jittered 65 kHz switching circuitry for peak current mode control
• Features self-relaxing off mode to achieve extremely low no-load consumption
• Includes built-in protection against overload, over-power, over-temperature, over-voltage, and short circuits

AC DC Converters, Offline Switchers Applications

• Offline power supplies requiring high performance and ruggedness
• Flyback converter designs targeting low no-load power consumption
• Applications utilizing peak current mode control strategies

AC DC Converters, Offline Switchers Procurement Notes

Verify the obsolete status and end-of-life designation before procurement planning. Confirm availability through authorized distributors or alternative sources as manufacturing has ceased. Ensure compatibility with existing design specifications given the discontinuation. Review official documentation for any specific handling or storage requirements associated with legacy inventory.

AC DC Converters, Offline Switchers Selection Notes

Select this component only if the specific 65 kHz fixed frequency and 9-pin SOIC package align with the design constraints. Evaluate the trade-off between the integrated high-voltage startup and the discontinued lifecycle status. Consider the thermal management capabilities required for the specified junction temperature range during operation.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1249 series of high-voltage current-mode PWM controllers from onsemi. These controllers are engineered to deliver robust performance in offline power applications while minimizing standby power usage through advanced frequency folding and skip-cycle mechanisms.

AC DC Converters, Offline Switchers Replacement Considerations

NCP1341A1D1R2G is listed as a similar replacement option by the manufacturer.