NXP Semiconductors TEA1792TS/1,115

Overview

TEA1792TS/1,115 from NXP Semiconductors is a synchronous rectifier (SR) controller IC for secondary-side use in discontinuous conduction mode (DCM) and quasi-resonant (QR) flyback converters. It features 8.5–38 V supply range, −220 mV typical activation threshold on SRSENSE, 10 V driver output, and selectable −42 mV/−30 mV regulation voltage via SELREG pin. It enables high-efficiency adapter designs with minimal external components.

For engineers reviewing the TEA1792TS/1,115 datasheet, TEA1792TS/1,115 pinout, TEA1792TS/1,115 application, or TEA1792TS/1,115 equivalent, this page delivers verified functional context, validated pin-level timing behavior, confirmed thermal limits (Rth(j-a) = 259 K/W), and real-world selection guidance for high-efficiency AC-DC power supplies.

Technical Context

The TEA1792TS/1,115 implements adaptive synchronous rectification using voltage sensing on the SRSENSE pin to detect secondary current zero-crossing, with blanking time (1.8 µs typical) to suppress ringing-induced false turn-off. Its driver delivers 400 mA source / 2.7 A sink capability and regulates output to maintain precise −42 mV or −30 mV at SRSENSE depending on SELREG pin state.

Start-up occurs at VCC ≥ 8.5 V (typical), with UVLO hysteresis of 0.5 V; operation ceases below 8.0 V. Internal bandgap references ensure stable timing and regulation across temperature, and the SOI process enhances ruggedness against dv/dt stress in high-frequency flyback topologies.

Key Specifications

Pinout & Package

TEA1792TS/1,115 is housed in a TSOP6 (SOT457) plastic surface-mount package measuring 3.1 mm × 2.7 mm × 1.1 mm, optimized for compact adapter PCB layouts and thermal performance (R_th(j-a) = 259 K/W on JEDEC board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4306DR2G, TEA1792TS/1,115 offers selectable regulation and higher driver strength for broader MOSFET compatibility; compared with Vishay's discrete solution, it delivers lower component count and tighter timing control at the cost of reduced configurability.

Availability

TEA1792TS/1,115 is available at Aetrix Electronics and suitable for USB-C PD adapters, laptop power supplies, and industrial auxiliary power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TEA1792TS/1,115 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 TEA1792TS/1,115 belongs to NXP's GreenChip family of high-efficiency power conversion ICs, designed specifically to replace lossy diode rectifiers in flyback-based AC-DC adapters and meet stringent global energy efficiency standards.

FAQ

What is the recommended minimum SRSENSE resistor value for TEA1792TS/1,115?

The TEA1792TS/1,115 datasheet specifies a typical R_SRSENSE of 1 kΩ. Lower values reduce protection against voltage transients on the secondary winding and risk exceeding the 120 V absolute maximum rating on the SRSENSE pin. For reliable operation under surge conditions, 1 kΩ is the validated minimum; values below 820 Ω are not supported per NXP characterization data.

Does TEA1792TS/1,115 support high-side or low-side synchronous rectification configurations?

Yes, TEA1792TS/1,115 supports both high-side and low-side SR configurations, as confirmed by Figures 4 and 5 in the official datasheet. In high-side mode, the DRIVER pin connects to the source of an N-channel MOSFET referenced to the secondary winding's positive rail; in low-side mode, it drives the gate of an N-channel MOSFET with source tied to ground. Layout guidelines differ for each configuration to minimize parasitic inductance.

How does the SELREG pin affect the timing behavior of TEA1792TS/1,115?

The SELREG pin directly sets the V_reg(drv) level: grounded → −42 mV; open → −30 mV. This changes the point at which the driver transitions from full drive to regulated mode, altering MOSFET conduction duration and gate discharge rate. A −42 mV setting extends conduction slightly, reducing RMS current but increasing switching loss; −30 mV shortens conduction, optimizing for higher-frequency QR operation.

What is the maximum allowable duty cycle for reliable operation of TEA1792TS/1,115?

The TEA1792TS/1,115 does not specify a maximum duty cycle limit. Instead, it enforces minimum active time constraints: driver output is disabled if secondary stroke duration falls below 1.8 µs (short time), and re-enabled above 2.1 µs (long time). This ensures stable operation down to ~1% duty cycle in high-frequency QR flyback designs, provided t_act(sr)(min) timing is respected.

Is TEA1792TS/1,115 qualified for automotive applications?

No, TEA1792TS/1,115 is not automotive-qualified. The NXP datasheet explicitly states in Section 14.4: "Unless this data sheet expressly states that this specific NXP Semiconductors product is automotive qualified, the product is not suitable for automotive use." It is rated for industrial and consumer adapter applications with operating junction temperature from −40 °C to +150 °C, but lacks AEC-Q100 qualification and automotive-specific reliability testing.