UCC28712D

AC DC Converters, Offline Switchers Overview

The UCC28712D is a primary-side regulated constant voltage and constant current flyback controller manufactured by Texas Instruments. It operates in discontinuous conduction mode with a maximum switching frequency of 100 kHz. The device features an internal 700V startup switch and supports fixed cable compensation levels. It utilizes negative temperature coefficient resistor interfaces for remote temperature sensing. The component is housed in a SOIC-7 package and functions within a supply voltage range of 9 V to 35 V, maintaining operation across temperatures from -40°C to +125°C.

AC DC Converters, Offline Switchers Feature Summary

• Provides isolated output regulation without requiring an optocoupler through primary-side sensing.
• Integrates a high-voltage startup switch to support ultra-low standby power consumption.
• Includes fixed cable compensation options compatible with NTC resistors for remote thermal monitoring.
• Features clamped gate drive outputs designed specifically for driving MOSFET power switches.

AC DC Converters, Offline Switchers Applications

• Offline AC/DC converters requiring primary-side regulation
• Charger designs targeting high power density
• Power supplies utilizing negative temperature coefficient sensors

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'D' corresponds to the tube packaging variant rather than the 'DR' reel variant when sourcing. Confirm that the fixed cable compensation configuration aligns with the system requirements, as this variant differs from the programmable UCC28710. Ensure the SOIC-7 footprint matches the target PCB layout constraints.

AC DC Converters, Offline Switchers Selection Notes

Select the UCC28712D when fixed cable compensation is sufficient and remote temperature sensing via NTC is required. This model is appropriate for applications prioritizing low standby power and simplified isolation barriers. Consider the UCC28710 if programmable cable compensation is necessary instead of fixed levels.

AC DC Converters, Offline Switchers Part Context

The UCC28712D belongs to the UCC2871x series of flyback controllers designed for offline power conversion. It shares architectural similarities with the UCC28710 and UCC28713 but distinguishes itself through fixed cable compensation settings. The series emphasizes efficiency through valley switching and frequency modulation while eliminating the need for secondary-side feedback components.

AC DC Converters, Offline Switchers Replacement Considerations

The UCC28710 offers similar functionality but provides programmable cable compensation instead of fixed levels. The UCC28713 also features fixed cable compensation but may differ in specific interface configurations. Verify pin compatibility and compensation requirements before substituting these family members.