TSM101CD

Overview

The TSM101CD is a voltage and current controller from STMicroelectronics, designed for secondary side regulation 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 an internal reference to provide feedback via an optocoupler to the primary-side PWM controller. Key electrical parameters include a 1.24 V fixed output reference with 1% precision, a supply voltage range of 4.5 V to 32 V, and an operational amplifier gain bandwidth product of 1 MHz. It operates within a temperature range of -20°C to +80°C and is housed in an SOIC-8 package.

Feature Summary

• Integrates a 1.24 V series voltage reference with 10 mA output capability and 1% precision.
• Contains two operational amplifiers with ORed outputs and a 1 MHz gain bandwidth product.
• Includes a built-in controlled current generator with enable/disable functionality for current limitation offset.
• Supports flyback topology applications with a wide supply voltage range.

Applications

• Secondary side control for flyback switching power supplies
• Voltage and current regulation in isolated power converters
• Feedback loop implementation for primary-side PWM controllers

Procurement Notes

Verify the specific suffix 'CD' corresponds to the SOIC-8 package and industrial temperature range (-20°C to +80°C) as documented. Confirm RoHS compliance status through official STMicroelectronics channels or authorized distributors prior to procurement. Ensure the ordering part number matches the required tape-and-reel or tube packaging configuration specified in the final datasheet revision.

Selection Notes

Select the TSM101CD when designing flyback converters requiring integrated secondary-side regulation without external references. The device simplifies design by combining voltage sensing, current limiting, and reference generation in a single SOIC-8 component. Consider the 1 MHz op-amp bandwidth for stability requirements and verify that the 4.5 V minimum supply voltage aligns with the auxiliary winding or bias supply characteristics of the target power stage.

Part Context

The TSM101 belongs to a family of secondary side switch-mode power supply controllers manufactured by STMicroelectronics. These components are categorized under Power Management ICs (PMIC) and specifically function as voltage and current controllers. The TSM101CD variant utilizes the SOIC-8 surface-mount package, distinguishing it from DIP or TSSOP options available in the broader series.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the available documentation. Designers should consult STMicroelectronics application notes or authorized distributor cross-reference tools for compatible alternatives.