NXP Semiconductors TEA1761T/N2,118

Overview

TEA1761T/N2,118 from NXP Semiconductors is a synchronous rectifier (SR) controller IC for DCM and quasi-resonant flyback SMPS, integrating SR gate drive, output voltage regulation (2.5 V ±1 %), output current limiting (50 mV), optocoupler driver, and overtemperature protection (150 °C). It operates from 8.6 V to 38 V supply and drives external MOSFETs with 10 V gate output for low R_DS(on) conduction.

For engineers reviewing the TEA1761T/N2,118 datasheet, TEA1761T/N2,118 pinout, TEA1761T/N2,118 application, or TEA1761T/N2,118 equivalent, key selection criteria include secondary-side SR timing accuracy (−310 mV activation, −55 mV regulation), zero-current switch-off detection (−12 mV threshold), SO8 package compatibility, and integrated primary-side feedback via opto coupler interface.

Technical Context

The TEA1761T/N2,118 implements a dedicated SR control architecture that senses negative voltage on SRSENSE to trigger MOSFET turn-on, regulates gate drive to maintain −55 mV during conduction, and disables output when SRSENSE exceeds −12 mV-enabling precise zero-current switching. Its internal bandgap reference (2.5 V ±1 %) feeds both VSENSE and ISENSE regulation loops.

It integrates an open-drain opto coupler driver (5 mA sink, 3.5–38 V output range) linearly controlled by VSENSE/ISENSE, plus thermal shutdown at 150 °C with hysteresis (12 °C), all fabricated in NXP's Silicon-on-Insulator (SOI) process for wide operating voltage tolerance and noise immunity.

Key Specifications

Pinout & Package

TEA1761T/N2,118 is housed in an SO8 plastic small outline package (SOT96-1), 3.9 mm body width, 1.27 mm pitch, suitable for high-density adapter PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous rectifier controller applications.

Compared with NCP4303DR2G, TEA1761T/N2,118 delivers integrated current limiting and higher gate drive voltage (10 V vs. 5 V), enabling lower R_DS(on) MOSFETs and tighter output regulation. Against ICE5QSBG, TEA1761T/N2,118 offers modular secondary-side control-preserving proven primary designs while upgrading efficiency.

Availability

TEA1761T/N2,118 is available at Aetrix Electronics and suitable for USB-C PD adapters, laptop AC adapters, and universal travel chargers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TEA1761T/N2,118 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

NXP Semiconductors is a Dutch semiconductor company specializing in secure connectivity solutions, automotive MCUs, and high-efficiency power management ICs.

The TEA1761T/N2,118 belongs to NXP's GreenChip family-designed specifically for energy-efficient AC-DC conversion in consumer and computing power supplies, with emphasis on DCM/QR flyback optimization and regulatory compliance.

FAQ

What is the minimum VCC start-up voltage for the TEA1761T/N2,118?

The TEA1761T/N2,118 starts up when VCC reaches 8.6 V (typical), with 0.5 V hysteresis-meaning it remains active down to 8.1 V before entering undervoltage lockout. This ensures reliable operation across wide input voltage ranges in universal-input adapters without auxiliary winding dependency. The SOI process further enhances startup stability under transient line conditions.

How does the TEA1761T/N2,118 achieve zero-current switching?

The TEA1761T/N2,118 detects zero-current switching by monitoring SRSENSE: when voltage rises to −12 mV (typical), the DRIVER output is actively pulled low, turning off the external MOSFET precisely at current zero. This eliminates reverse recovery loss and enables high efficiency at light loads. The 2 µs blanking window after turn-on prevents false triggering from ringing.

Can the TEA1761T/N2,118 regulate both output voltage and current simultaneously?

Yes-the TEA1761T/N2,118 independently regulates output voltage via VSENSE (target 2.5 V ±1 %) and output current via ISENSE (target 50 mV ±4 mV). During constant-current mode, ISENSE dominates feedback; during constant-voltage mode, VSENSE controls regulation. Both loops feed the OPTO driver to coordinate primary-side response without external logic.

What is the maximum sink current capability of the OPTO pin on the TEA1761T/N2,118?

The OPTO pin on the TEA1761T/N2,118 provides a maximum sink current of 5 mA (typical), with absolute maximum rating of 12 mA. Its open-drain configuration and 3.5–38 V output voltage range ensure compatibility with standard optocouplers (e.g., PC817, TLP183) across aging, CTR variation, and temperature drift-maintaining stable feedback loop integrity.

Does the TEA1761T/N2,118 require an external voltage reference?

No-the TEA1761T/N2,118 integrates a temperature-compensated bandgap reference trimmed to 2.5 V ±1 % accuracy, used for both VSENSE and ISENSE regulation. This eliminates the need for external references, reduces component count, and ensures consistent regulation performance across −20 °C to +150 °C junction temperature range.