UCD3138A64PFC

Overview

The UCD3138A64PFC is a highly integrated digital controller for isolated power applications, specifically designed for Power Factor Correction (PFC). It features a 32-bit ARM7TDMI-S processor with 64kB program flash and supports up to three independent feedback loops. Key specifications include a 16MHz error ADC, eight high-resolution DPWM outputs with 250ps pulse width resolution, and interfaces including I2C, PMBus, SPI, and UART. The device operates within a temperature range of -40°C to +125°C.

Feature Summary

• Supports digital control of up to three independent feedback loops using dedicated PID hardware
• Enables firmware updates without shutting down the power supply via dual memory image support
• Integrates high-speed analog comparators and configurable digital comparison logic
• Provides flexible modulation options including voltage, average current, and peak current modes

Applications

• Single-phase Power Factor Correction (PFC) designs
• Server power supplies requiring high efficiency
• Telecommunications rectifiers
• Industrial power conversion modules

Procurement Notes

Verify the specific package variant and ordering suffix against the official Texas Instruments datasheet to ensure compatibility with your PCB footprint and thermal requirements. Confirm that the selected revision matches the intended firmware development environment. Cross-reference the interface pinout for I2C, SPI, and UART connections to avoid signal integrity issues during integration.

Selection Notes

Select this component when designing PFC stages requiring precise digital control and field-updatable firmware. The 64kB flash capacity suits complex algorithms while maintaining cost efficiency. Ensure the design leverages the built-in DPWM resolution for optimal transient response. Consider the available communication ports for system monitoring and remote configuration capabilities.

Part Context

This part belongs to the UCD3138x family of digital power controllers from Texas Instruments. It extends the standard UCD3138 functionality with additional communication ports and larger memory banks. The PFC designation indicates optimized firmware or hardware configurations for power factor correction applications, distinguishing it from general-purpose DC/DC variants within the same series.

Replacement Considerations

UCD3138A64 serves as a functional base equivalent with fewer communication interfaces. UCD3138128 offers increased program flash memory for more complex applications. UCD3138CC64EVM-030 is an evaluation module, not a direct chip replacement.