TSM101ACDT

Overview

The TSM101ACDT is an active voltage and current controller from STMicroelectronics, designed for secondary side control in switching power supplies. It integrates a high-stability series band gap voltage reference, two ORed operational amplifiers, 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 PWM controller. Key electrical parameters include a 1.24 V fixed output reference with 1% precision, a 10 mA reference output current, and a supply voltage range of 4.5 V to 32 V. The operational amplifiers feature a 1 MHz gain bandwidth product. It operates within an industrial temperature range of -40°C to 80°C and is available in SO-8 tape and reel packaging.

Feature Summary

• Integrates a high-stability series band gap voltage reference with 1% precision
• Includes two operational amplifiers with ORed outputs for flexible configuration
• Features a built-in current generator with enable/disable functionality for current limiting adjustment
• Provides feedback through an optocoupler to primary side PWM controllers

Applications

• Secondary side control for AC-DC switching power supplies
• Flyback converter topology management
• Battery charger controller circuits
• Voltage and current regulation in offline power converters

Procurement Notes

Verify the specific suffix 'CDT' confirms the SO-8 package and Tape & Reel packing type as documented. Ensure the component grade matches Industrial specifications (-40°C to 80°C) required for your application environment. Confirm RoHS compliance status corresponding to the Ecopack3 standard. Cross-reference the manufacturer part number TSM101ACDT with official STMicroelectronics documentation to validate pinout and electrical characteristics before integration.

Selection Notes

Select this component when secondary side regulation is required for flyback or similar topologies. It is suitable for designs needing precise voltage referencing and adjustable current limiting without complex external circuitry. Consider the 4.5 V to 32 V supply range compatibility with your auxiliary winding or bias supply. The SO-8 package is appropriate for surface mount assembly processes requiring standard reflow soldering profiles.

Part Context

The TSM101A series belongs to STMicroelectronics' portfolio of specialty analog circuits for power management. Variants such as TSM101ACD (tube) and TSM101AID differ primarily in packaging and shipping format rather than core functionality. This family is specifically engineered for off-line power conversion applications where accurate secondary side sensing improves overall system efficiency and regulation stability.

Replacement Considerations

Direct substitutes include other TSM101A variants like TSM101ACD or TSM101AID if packaging differences are acceptable. Verify pin-to-pin compatibility and identical electrical specifications before substitution. Generic voltage references or op-amps do not replicate the integrated control logic and ORed output structure.