TSM1052

Overview

The TSM1052 is a highly integrated constant voltage and constant current controller designed for switch-mode power supply applications. It operates with a minimum supply voltage of 1.7 V and a maximum of 18 V, drawing a typical quiescent current of 150 uA. The device features an internal accuracy of 0.5% and functions within a temperature range of -10°C to +85°C. Housed in a compact SOT-23-6 surface-mount package, it integrates a voltage reference, two operational amplifiers with OR-ed open-drain outputs, and a low-side current sensing circuit to facilitate dual-loop regulation.

Feature Summary

• Integrates dual control loops for seamless transition between constant voltage and constant current modes
• Features wired-or open-drain output stage for simplified frequency compensation
• Provides high-accuracy internal voltage reference with low external component count
• Supports very low voltage operation and minimal quiescent consumption

Applications

• Secondary side control for AC-DC adapters
• Battery charger designs for mobile devices
• Compact power supplies requiring space-shrunk solutions

Procurement Notes

Verify the specific ordering suffix to ensure the correct tape and reel configuration matches your assembly requirements. Confirm that the SOT-23-6 package dimensions align with your PCB footprint constraints. Ensure the selected variant meets the required operating temperature range for your specific environment. Cross-reference the datasheet revision to confirm pinout compatibility with existing designs.

Selection Notes

Select this component when designing secondary-side regulation for isolated flyback converters. It is suitable for applications requiring precise CV/CC control with minimal external parts. Consider its low quiescent current for energy-efficient designs. Evaluate the SOT-23-6 package size against available board space. Verify that the 1.7 V minimum supply voltage is compatible with your transformer auxiliary winding design.

Part Context

The TSM1052 belongs to STMicroelectronics' portfolio of highly integrated voltage and current controllers. This family includes variants like the TSM101 series and SEA05, offering different accuracy grades and integration levels. These ICs are engineered to simplify control loop design and reduce electrical stress on secondary side components in switch-mode power supplies.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Engineers should consult official STMicroelectronics resources or authorized distributors for verified cross-references before implementation.

FAQ

How does the TSM1052 manage the transition between constant voltage and constant current modes?

It uses two op amps with OR-ed open-drain outputs to create a dual control loop that seamlessly transitions between CV and CC regulation based on load conditions.

What is the minimum operating supply voltage for the TSM1052?

The minimum operating supply voltage is 1.7 V, allowing for low-voltage operation in compact power supply designs.