TSM101CN

Overview

The TSM101CN is a voltage and current controller integrated circuit manufactured by STMicroelectronics, designed for secondary side control in switching power supplies. It incorporates a high-stability series bandgap voltage reference providing 1.24 V with ±1% precision and 10 mA output current. The device features two ORed operational amplifiers with a 1 MHz gain bandwidth product and a built-in current generator with enable/disable functionality. It operates within a supply voltage range of 4.5 V to 32 V and supports an operating temperature range from -40°C to +105°C. The component is housed in an 8-pin PDIP package.

Feature Summary

• Integrates a precise 1.24 V series bandgap voltage reference with 10 mA output capability
• Contains two operational amplifiers with ORed outputs and 1 MHz gain bandwidth product
• Includes a controlled current generator for adjustable current limitation offset

Applications

• Secondary side control for switching mode power supplies
• Voltage and current regulation feedback loops
• Optocoupler interface circuits for primary side PWM controllers

Procurement Notes

Verify the specific suffix 'CN' corresponds to the PDIP-8 package variant when sourcing. Confirm that the intended application requires through-hole mounting capabilities, as other suffixes like 'CDT' or 'IDT' indicate surface-mount SOIC packages. Ensure compatibility with the required 4.5 V to 32 V supply range and check if the 10 mA reference output current meets the load requirements of the design.

Selection Notes

Select this component when a through-hole DIP package is required for secondary side power supply control. The TSM101 family provides essential functions including voltage referencing and dual op-amps for error amplification. Consider the 1 MHz bandwidth for frequency response needs and verify that the 1.24 V reference precision aligns with system accuracy specifications. Evaluate thermal performance within the -40°C to +105°C range for the target environment.

Part Context

The TSM101 belongs to a family of specialized analog circuits focused on power management. Variants such as TSM101ACD and TSM101AID offer similar electrical characteristics but differ in packaging, with some utilizing SOIC or TSSOP formats. The core functionality remains consistent across the series, serving as a bridge between secondary side sensing and primary side pulse width modulation control via optocouplers.

Replacement Considerations

Public confirmed substitute part numbers include TSM101ACDT.