TSM101AID

Overview

The TSM101AID is a voltage and current controller integrated circuit designed for secondary side regulation in switching power supplies. It incorporates a high-stability series bandgap voltage reference, two ORed operational amplifiers with a 1 MHz gain bandwidth product, and a controlled current source. The device compares DC output voltage and current levels against internal references to provide feedback via an optocoupler to the primary-side PWM controller. It supports a supply voltage range of 4.5V to 32V and features a fixed 1.24V reference with 1% precision and 10mA output current capability.

Feature Summary

• Integrates a stable series bandgap voltage reference with 1% precision
• Includes two operational amplifiers with ORed outputs for combined control
• Features a built-in current generator with enable/disable functionality
• Provides optocoupler feedback interface for primary-side PWM controllers

Applications

• Secondary side regulation for switch-mode power supplies
• Constant voltage and constant current battery charging control
• Power management circuits requiring precise voltage referencing

Procurement Notes

Verify the specific suffix 'AID' corresponds to the SOIC-8 package variant when sourcing. Confirm that the component meets RoHS3 compliance standards required for your assembly process. Ensure the operating temperature range aligns with your system's thermal design constraints. Cross-reference the manufacturer part number with distributor catalogs to confirm availability and lead times before finalizing procurement plans.

Selection Notes

Select this component for designs requiring integrated voltage and current monitoring without external discrete comparators. The dual op-amp configuration allows simultaneous regulation loops. Consider the 1MHz bandwidth for dynamic load response requirements. Verify compatibility with the optocoupler interface used in the primary controller. Evaluate the 4.5V to 32V supply range against the secondary winding rectification voltage.

Part Context

The TSM101 series serves as a specialized solution for isolated power supply topologies. It replaces multiple discrete components by combining reference, amplification, and current sensing functions. This integration reduces board space and simplifies compensation network design. The family includes variants like TSM1011 for enhanced CV/CC modes, offering flexibility for different power density and performance targets.

Replacement Considerations

• TSM101ACDT

FAQ

How does the current limiting function operate?

The controlled current generator modifies the current limitation level by offsetting information from the current sensing resistor, allowing adjustable protection thresholds.

What is the output type of the voltage reference?

The voltage reference provides a fixed output voltage of 1.24V with a maximum output current of 10mA.