STCMB1TR

Overview

The STCMB1TR is a transition mode (TM) power factor correction and LLC resonant half-bridge combo controller manufactured by STMicroelectronics. It integrates a TM PFC controller, an LLC high-voltage double-ended controller, an 800 V-rated high-voltage section, and supervisory glue logic. The device operates with a switching frequency up to 500 kHz for the PFC and up to 750 kHz for the half-bridge. It supports a supply voltage range of 10 V to 20 V and functions within a junction temperature range of -40°C to 125°C. The component is housed in a 20-SOIC package.

Feature Summary

• Integrates proprietary constant on-time control methodology for the PFC section without requiring a sinusoidal input reference.
• Features timeshift control (TSC) for the LLC half-bridge to improve dynamic response and input ripple rejection.
• Includes adaptive deadtime adjustment to ensure zero voltage switching across varying load conditions.
• Provides comprehensive protection mechanisms including cycle-by-cycle overcurrent, output overvoltage, and feedback failure detection.

Applications

• High-efficiency power supplies utilizing transition mode PFC and LLC resonant topologies
• Adapters and chargers requiring low standby power consumption
• Industrial power conversion systems needing robust fault protection

Procurement Notes

Verify the specific suffix 'TR' indicates tape and reel packaging when sourcing. Confirm that the component matches the 20-SOIC physical dimensions and pinout defined in the official datasheet. Ensure compatibility with the required 800 V high-voltage start-up specifications for your circuit design.

Selection Notes

Select this controller for designs prioritizing reduced external component count due to its integrated control methodologies. Consider its burst mode capability for applications demanding minimal input power consumption at light loads. Evaluate the need for its specific protection features against potential system faults such as inrush current or inductor saturation.

Part Context

The STCMB1 belongs to STMicroelectronics' portfolio of power management integrated circuits designed for advanced power conversion architectures. It combines multiple control functions into a single chip to simplify board layout and enhance reliability. This integration supports modern efficiency standards and reduces the overall bill of materials for complex power supply designs.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Verify functional equivalence carefully if considering alternative controllers from other manufacturers.

FAQ

How does the STCMB1 handle light-load conditions?

The IC enters a controlled burst mode operation where both the HB and PFC modules work intermittently and synchronously to reduce average switching frequency and minimize input consumption.

What protection is provided during startup?

It includes a proprietary hard switching prevention (HSP) function to prevent hard switching in initial cycles and avoids capacitive mode operation to ensure soft-switching.