NXP Semiconductors TEA1792T/N1,118

Overview

TEA1792T/N1,118 from NXP Semiconductors is a synchronous rectifier (SR) controller IC for DCM and quasi-resonant flyback converters, fabricated in Silicon-On-Insulator (SOI) process. It delivers accurate SR timing with Vact(drv) = −220 mV (typ), driver output voltage up to 10 V (typ), and supports selectable regulation levels (−42 mV/−30 mV) via SELREG pin - enabling high-efficiency adapter designs.

For engineers reviewing the TEA1792T/N1,118 datasheet, TEA1792T/N1,118 pinout, TEA1792T/N1,118 application, or TEA1792T/N1,118 equivalent, key selection criteria include its 8.5–38 V supply range, 1.8 µs minimum active time, −12 mV zero-current detection threshold, and SO8 package compatibility with high-side/low-side SR configurations.

Technical Context

The TEA1792T/N1,118 implements adaptive synchronous rectification by sensing secondary-side voltage on SRSENSE to trigger and regulate the DRIVER output. Its internal timer blanks input for 1.8 µs (min) after activation to suppress ringing-induced false turn-off.

Start-up occurs at VCC > 8.5 V (typ), with UVLO hysteresis of 0.5 V (typ); driver sourcing capability is 400 mA (typ) and sinking capability is 2.7 A (typ), enabling fast MOSFET switching. Regulation level (−42 mV or −30 mV) is selected by grounding or leaving SELREG open.

Key Specifications

Pinout & Package

TEA1792T/N1,118 is housed in an SO8 plastic small outline package (SOT96-1), 3.9 mm body width, 1.27 mm lead pitch, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4306DR2G, TEA1792T/N1,118 offers dual regulation levels, higher 10 V driver output, and SOI-based noise immunity - making it preferable for high-efficiency, multi-level adapter designs. Unlike SiHP12N50C-E3, TEA1792T/N1,118 is a complete controller, eliminating need for external timing circuitry.

Availability

TEA1792T/N1,118 is available at Aetrix Electronics and suitable for USB-C PD adapters, laptop power supplies, and industrial AC-DC modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TEA1792T/N1,118 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 global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The TEA1792T/N1,118 belongs to NXP's GreenChip family of high-efficiency power conversion ICs, designed specifically to replace lossy secondary-side diodes in flyback converters while meeting stringent global energy efficiency standards.

FAQ

What is the recommended external resistor value for the SRSENSE pin on the TEA1792T/N1,118?

The TEA1792T/N1,118 datasheet specifies a typical R_SRSENSE value of 1 kΩ to protect the SRSENSE pin from excessive voltage while preserving timing accuracy. Values significantly lower than 1 kΩ reduce protection margin; values higher than 1 kΩ may degrade timing resolution due to RC filtering effects on fast transient detection. Always verify with actual transformer secondary waveform under worst-case load and line conditions.

Does the TEA1792T/N1,118 support high-side synchronous rectification configurations?

Yes, the TEA1792T/N1,118 supports both high-side and low-side SR configurations, as confirmed by Figures 4 and 5 in the official datasheet. In high-side implementation, the DRIVER pin connects to the source of an N-channel MOSFET, requiring appropriate level-shifting layout; the SRSENSE pin monitors voltage across a sense resistor placed between transformer secondary and MOSFET source.

How does the SELREG pin affect regulation behavior in the TEA1792T/N1,118?

The SELREG pin on the TEA1792T/N1,118 selects between two driver regulation voltages: grounding the pin sets V_reg(drv) to −42 mV (typ), optimizing for lowest conduction loss; leaving it open sets V_reg(drv) to −30 mV (typ), improving noise immunity in electrically noisy layouts. Internal 10 µA pull-up ensures reliable open-state detection without external components.

What is the maximum allowable voltage on the SRSENSE pin of the TEA1792T/N1,118?

The absolute maximum voltage rating for the SRSENSE pin of the TEA1792T/N1,118 is +120 V, as specified in Table 3 (Limiting Values) of the datasheet. This high rating - enabled by SOI process technology - allows direct connection to transformer secondary windings without clamping diodes in most DCM and QR flyback designs operating below 100 V reflected output.

Can the TEA1792T/N1,118 operate without an auxiliary winding for VCC supply?

Yes, the TEA1792T/N1,118 can be powered directly from the output rail via a resistive dropper or small-capacitor-fed network, eliminating need for an auxiliary winding. Its 8.5–38 V VCC range and low 1.0 mA operating current (typ) make it compatible with self-biased startup schemes common in compact adapter designs where PCB area is constrained.