STMicroelectronics TSM1014AIDT

Overview

TSM1014AIDT from STMicroelectronics is a dual-op-amp-based CV/CC controller IC for secondary-side feedback in flyback adapters and battery chargers, featuring 1.25 V ±0.5% reference voltage, 100–180 µA supply current, 65–100 dB supply voltage rejection, and 0.5–1 mA/mV transconductance gain. It enables precise voltage regulation at up to 4.1 V output and current limiting via external sense resistor.

For engineers reviewing the TSM1014AIDT datasheet, TSM1014AIDT pinout, TSM1014AIDT application, or TSM1014AIDT equivalent, this device supports accurate dual-loop control in compact AC/DC power supplies where low quiescent current, high mains rejection, and SO-8 footprint are critical design requirements.

Technical Context

The TSM1014AIDT integrates two independent transconductance operational amplifiers sharing a common 1.25 V precision reference: one configured as a voltage error amplifier (CV- input, CVOUT output), the other as a current error amplifier (Cc+ and Cc- inputs, CCOUT output). Both outputs sink current to drive an optocoupler LED in ORing configuration.

Its internal Zener clamp limits VCC to 28 V, enabling direct connection to regulated secondary rails without external overvoltage protection. Compensation networks are fully accessible-CVOUT and CV- pins allow type-II/III compensation; CCOUT and Cc- pins support independent current-loop stabilization.

Key Specifications

Pinout & Package

Package: SO-8 (ECOPACK® compliant, 175 °C/W θ_JA).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CV/CC controller applications.

Compared with TL431LIQDBVRQ1 and UCC28740DR, the TSM1014AIDT provides a proven, low-risk secondary-side solution requiring minimal external components while retaining full optocoupler isolation-ideal for legacy designs and safety-critical applications where primary-side digital control is not approved.

Availability

TSM1014AIDT is available at Aetrix Electronics and suitable for USB-C PD adapters, lithium-ion battery chargers, and industrial AC/DC power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant SO-8 packaging.

Supply support for TSM1014AIDT 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 microcontrollers, power ICs, sensors, and analog products for automotive, industrial, and consumer markets.

The TSM1014AIDT belongs to ST's dedicated power management analog portfolio, engineered specifically for high-precision, low-power secondary-side regulation in isolated SMPS topologies such as flyback and forward converters.

FAQ

What is the maximum allowable VCC voltage for continuous operation?

The TSM1014AIDT supports continuous operation up to 28 V on VCC (Pin 8), enforced by an internal Zener clamp. Exceeding 28 V risks permanent damage-even brief transients above this level require external clamping. The clamp activates at ~28 V with typical knee current of 50 mA, and thermal derating applies above 85 °C ambient.

Can CV and CC loops operate independently without interaction?

Yes-the CV and CC amplifiers are physically separate with independent inputs and outputs, but their sinking outputs (CVOUT and CCOUT) are internally wired in OR configuration to drive a single optocoupler LED. This ensures that whichever loop reaches its limit first dominates feedback, preventing overvoltage or overcurrent conditions simultaneously.

How does the 0.5% VRef tolerance impact overall output voltage accuracy?

With VRef = 1.25 V ±0.5% (±6.25 mV), and assuming standard resistor divider tolerances (1% R1/R2), the total output voltage error in a 5 V adapter is typically ±1.2%, dominated by VRef drift and resistor matching-not op-amp offset. At 25 °C, VRef deviation is ≤±2.5 mV, enabling sub-1% calibration in production test.

Is external compensation mandatory, or can the device operate un-compensated?

External compensation is mandatory for stable closed-loop operation. Neither amplifier includes internal compensation. CVOUT and CV− pins, and CCOUT and Cc− pins, provide direct access to output and inverting input nodes-enabling full Type II or III network implementation. Uncompensated use results in oscillation or poor transient response in both loops.