STMicroelectronics TSM1013ID

Overview

TSM1013ID from STMicroelectronics is a dual-loop CV/CC controller IC for secondary-side regulation in flyback adapters and battery chargers, integrating a 2.5 V ±0.5% voltage reference, two transconductance op-amps (Gm = 3.5 mA/mV), and sink-only output stage. It operates from 4.5 V to 28 V supply, supports 0–105°C ambient, and enables precise voltage and current limiting via external resistor networks.

For engineers reviewing the TSM1013ID datasheet, TSM1013ID pinout, TSM1013ID application, or TSM1013ID equivalent, key selection criteria include its dual transconductance amplifier architecture, fixed 2.5 V reference precision, SO-8 package thermal resistance (175 °C/W), and compatibility with optocoupler-based feedback in isolated SMPS designs.

Technical Context

The TSM1013ID implements two independent transconductance operational amplifiers: one configured as a voltage controller (Cv−/Cv Out) referenced to the internal 2.5 V bandgap, and another as a current limiter (Cc−/Cc+/Cc Out) using external Rsense and Vref-derived threshold. Both amplifiers feature fully accessible inputs and outputs for external compensation (e.g., Rcv1/Cvc1 and Ric1/Cic1).

Its internal zener clamp limits Vcc to 28 V under overvoltage conditions, and the common-sink output stage provides ORing behavior-activating the optocoupler whenever either voltage or current loop triggers, enabling robust foldback protection without additional logic.

Key Specifications

Pinout & Package

Package: SO-8 (Small Outline Integrated Circuit, 150 mil width), surface-mount, plastic body with gull-wing leads. Thermal resistance junction-to-ambient is 175 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant voltage and constant current control applications.

Compared with TL431ACD and UCC3803D, TSM1013ID uniquely integrates both CV and CC control loops with a shared 2.5 V reference and ORing sink outputs-enabling single-optocoupler, isolated secondary regulation with <1% voltage and <3% current accuracy, without adding discrete op-amps or compromising safety isolation.

Availability

TSM1013ID is available at Aetrix Electronics and suitable for adapter power supplies, battery chargers, and industrial SMPS modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TSM1013ID includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and automotive ICs for industrial, consumer, and automotive markets.

The TSM1013ID belongs to ST's dedicated SMPS secondary-side controller product line, engineered specifically for cost-effective, high-precision CV/CC regulation in isolated flyback converters without digital supervision.

FAQ

What is the function of the common-sink output stage in TSM1013ID?

The common-sink output stage connects Cv Out (Pin 5) and Cc Out (Pin 7) internally to a shared current sink node. This creates hardware-level ORing: if either the voltage or current loop triggers, the combined sink activates the optocoupler LED. No external diodes or logic are needed, simplifying layout and improving fault response time in overvoltage or overcurrent events.

Can TSM1013ID operate with supply voltages below 4.5 V?

No. The absolute minimum Vcc is 4.5 V per the operating conditions table. Below this, internal biasing fails and reference stability degrades. Startup under light load may require auxiliary winding or Zener-clamped supply to ensure Vcc ≥ 4.5 V before regulation engages - especially critical during short-circuit or no-load conditions.

How does the 2.5 V reference precision affect current-limit accuracy?

Current limit accuracy directly depends on Vref precision because Vsense = Vref × R5/(R4+R5). With TSM1013A's 0.5% Vref tolerance, and matched R4/R5 resistors, current limit error remains ≤1.2% at 25°C. Over temperature, ∆Vref ≤30 mV adds ≤1.2% additional error at 105°C, assuming Rsense drift is negligible.

Is external compensation mandatory for stable loop operation?

Yes. Both op-amps require external RC networks (e.g., Rcv1=22 kΩ + Cvc1=2.2 nF for voltage loop; Ric1=22 kΩ + Cic1=2.2 nF for current loop) connected between output and inverting input. Omitting compensation causes phase margin loss and oscillation in typical flyback feedback configurations due to optocoupler delay and transformer leakage inductance.