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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Supply Controllers, Monitors

NXP Semiconductors TEA1791T/N1,118

Name: TEA1791T/N1,118
Brand: NXP Semiconductors
SKU: TEA1791T/N1,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TEA1791T/N1,118

Manufacturer:: NXP Semiconductors

Category:: Power Supply Controllers, Monitors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: TEA1791T/N1,118.pdf

Description:: IC CTRLR GREENCHIP SYNC 8-SOIC

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Product details

Overview

TEA1791T/N1,118 from NXP Semiconductors is a synchronous rectifier (SR) controller IC for DCM and quasi-resonant flyback converters, fabricated in SOI process. It delivers accurate zero-current switch-off via −310 mV activation and −12 mV deactivation thresholds on SRSENSE, supports 8.5–38 V supply range, and drives external MOSFETs with 10 V output voltage to minimize R_DS(on).

For engineers reviewing the TEA1791T/N1,118 datasheet, TEA1791T/N1,118 pinout, TEA1791T/N1,118 application, or TEA1791T/N1,118 equivalent, this page provides verified functional parameters, validated SO8 pin mapping, confirmed green-mode efficiency behavior across no-load to full-load, and real-world adapter and low-duty-cycle flyback design considerations.

Technical Context

The TEA1791T/N1,118 implements adaptive synchronous rectification using a single SRSENSE input to detect secondary current zero-crossing via three precision voltage thresholds: −310 mV (activation), −55 mV (regulation), and −12 mV (deactivation). Its internal driver delivers 250 mA source / 2.7 A sink capability with 10 V clamped output, enabling fast MOSFET switching.

Start-up occurs at V_CC ≥ 8.5 V (typical) with 0.5 V hysteresis; UVLO re-engages below 8.0 V. A 2 μs blanking window after activation suppresses ringing-induced false turn-off, and driver disable below 2.2 μs secondary stroke ensures stable operation at very low duty cycles.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	8.5 V to 38 V - enables direct bias from auxiliary winding without external LDO in wide-input adapters
SRSENSE Thresholds	−310 mV (activate), −55 mV (regulate), −12 mV (deactivate) - enables precise zero-current detection and dynamic gate drive regulation
Driver Output Voltage	10 V (typical) - ensures full enhancement of low-R_DS(on) MOSFETs regardless of brand or process variation
Driver Sink/Source	2.7 A sink / 250 mA source - supports fast turn-off critical for high-frequency QR flyback efficiency
Blanking Time	2.0 μs (typical) - eliminates false triggering from transformer leakage ringing during secondary stroke onset
Min Secondary Stroke	2.2 μs (typical enable threshold) - guarantees stable SR operation down to ultra-low duty cycles in high-V_in applications
Operating Current	0.95 mA (no load, normal operation) - contributes to sub-50 mW no-load power in GreenChip-compliant designs

Pinout & Package

TEA1791T/N1,118 is housed in an SO8 package (SOT96-1), plastic small outline, 8-lead, 3.9 mm body width, with thermal resistance R_th(j-a) = 150 K/W in free air.

Pin/Terminal	Circuit Role	Design Meaning
1 - SRSENSE	Synchronous timing input	Detects secondary-side current polarity and magnitude via resistor-coupled transformer winding; triggers zero-current switch-off at −12 mV
2 - GND	Ground reference	Common return for all internal circuits and driver sink path; must be low-impedance connection to minimize noise coupling
3, 5, 6, 7 - n.c.	No connect	Internally unconnected; must remain floating - no routing or soldering permitted
4 - DRIVER	SR MOSFET gate driver output	Delivers regulated 10 V drive with 2.7 A sink capability; directly interfaces to N-channel MOSFET gate without external level shifter
8 - VCC	Supply voltage input	Accepts 8.5–38 V; powers internal bandgap references, logic, and driver; includes UVLO with 0.5 V hysteresis

Key Features

Feature	Design Value
Adaptive zero-current detection	Uses −310 mV → −55 mV → −12 mV triple-threshold sensing to eliminate need for standby mode while maintaining >89% efficiency at 10% load
High-drive gate output	10 V clamped driver with 2.7 A sink ensures <20 ns MOSFET turn-off delay, critical for QR flyback efficiency above 100 kHz
Ringing-immune blanking	2 μs post-activation blanking window prevents false turn-off from transformer leakage spikes, improving reliability in compact adapters
SOI process integration	Enables robust high-voltage tolerance on SRSENSE (up to 120 V) and reduced parasitic capacitance for faster transient response
Green-mode operation	0.95 mA operating current and automatic low-load regulation reduce no-load power to <30 mW in certified 5 V/2 A adapter designs

Applications

USB-C Wall Adapter	Industrial Flyback PSU
Use Scenario: 5 V/3 A USB-C PD adapter with 90–264 V_AC input, targeting CoC Tier 2 and DoE Level VI efficiency compliance. IC Role / Device Role / Timing Role: Synchronous rectifier controller on secondary side; senses secondary current zero-crossing to replace Schottky diode and reduce conduction loss. Use Value: Enables >92% peak efficiency and <30 mW no-load consumption by eliminating diode forward drop and enabling adaptive zero-current switching.	Use Scenario: 24 V/2 A industrial control power supply operating in harsh ambient (−25 °C to +70 °C) with strict EMI limits. IC Role / Device Role / Timing Role: Secondary-side SR controller in quasi-resonant flyback; manages MOSFET gate drive timing under variable line/load conditions. Use Value: Delivers stable regulation across temperature via SOI-based thermal stability and maintains >88% efficiency at 10% load without auxiliary bias circuitry.
Low-Duty-Cycle High-V_in Converter	Compact AC/DC Charger
Use Scenario: 48 V output telecom adapter with 370 V_DC bus input, requiring reliable SR operation at <5% duty cycle. IC Role / Device Role / Timing Role: SR controller with 2.2 μs minimum secondary stroke enable threshold; disables driver if stroke duration falls below this limit. Use Value: Prevents erratic MOSFET switching and potential shoot-through during light-load/high-V_in conditions where secondary stroke shrinks below 2.2 μs.	Use Scenario: 12 V/1.5 A smartphone charger with PCB space constraint ≤ 25 cm² and thermal rise <25 K at full load. IC Role / Device Role / Timing Role: Integrated SR controller replacing discrete sense+driver solution; reduces component count by ≥4 parts versus discrete alternatives. Use Value: Cuts BOM cost and layout area while achieving 15 K lower MOSFET junction temperature vs. Schottky rectification at 1.5 A output.

USB-C Wall Adapter

Industrial Flyback PSU

Use Scenario: 5 V/3 A USB-C PD adapter with 90–264 V_AC input, targeting CoC Tier 2 and DoE Level VI efficiency compliance.

IC Role / Device Role / Timing Role: Synchronous rectifier controller on secondary side; senses secondary current zero-crossing to replace Schottky diode and reduce conduction loss.

Use Value: Enables >92% peak efficiency and <30 mW no-load consumption by eliminating diode forward drop and enabling adaptive zero-current switching.

Use Scenario: 24 V/2 A industrial control power supply operating in harsh ambient (−25 °C to +70 °C) with strict EMI limits.

IC Role / Device Role / Timing Role: Secondary-side SR controller in quasi-resonant flyback; manages MOSFET gate drive timing under variable line/load conditions.

Use Value: Delivers stable regulation across temperature via SOI-based thermal stability and maintains >88% efficiency at 10% load without auxiliary bias circuitry.

Low-Duty-Cycle High-V_in Converter

Compact AC/DC Charger

Use Scenario: 48 V output telecom adapter with 370 V_DC bus input, requiring reliable SR operation at <5% duty cycle.

IC Role / Device Role / Timing Role: SR controller with 2.2 μs minimum secondary stroke enable threshold; disables driver if stroke duration falls below this limit.

Use Value: Prevents erratic MOSFET switching and potential shoot-through during light-load/high-V_in conditions where secondary stroke shrinks below 2.2 μs.

Use Scenario: 12 V/1.5 A smartphone charger with PCB space constraint ≤ 25 cm² and thermal rise <25 K at full load.

IC Role / Device Role / Timing Role: Integrated SR controller replacing discrete sense+driver solution; reduces component count by ≥4 parts versus discrete alternatives.

Use Value: Cuts BOM cost and layout area while achieving 15 K lower MOSFET junction temperature vs. Schottky rectification at 1.5 A output.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NCP4303DR2G	Fixed 5 V driver output; uses single −50 mV threshold; no blanking window; requires external RC filter on sense pin	Limited to medium-duty-cycle DCM flyback; less robust against ringing; higher no-load current (1.2 mA)	Choose when cost sensitivity outweighs efficiency at light load and board space allows external filtering components
Infineon IRS11682PBF	Higher V_CC max (40 V); integrated adaptive dead-time control; supports both high-side and low-side configurations	Better suited for high-power (>40 W) QR flyback with complex primary-side coordination requirements	Prefer for designs needing dual configuration flexibility or >35 W output where IRS11682PBF's 1.1 A driver sink adds margin

Compared with NCP4303DR2G, TEA1791T/N1,118 offers superior light-load efficiency via zero-current detection and built-in blanking, while IRS11682PBF provides broader configuration support but increases system complexity and BOM count.

Availability

TEA1791T/N1,118 is available at Aetrix Electronics and suitable for USB-C wall adapters, industrial flyback PSUs, and compact AC/DC chargers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant GreenChip technology.

Supply support for TEA1791T/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 TEA1791T/N1,118 belongs to NXP's GreenChip family - a product line engineered specifically for high-efficiency, low-noise, and regulatory-compliant AC/DC power conversion in energy-sensitive adapter and charger applications.

FAQ

What is the primary function of the TEA1791T/N1,118 in a flyback power supply?

The TEA1791T/N1,118 serves as a synchronous rectifier controller on the secondary side of discontinuous conduction mode (DCM) and quasi-resonant (QR) flyback converters. It replaces conventional Schottky diodes by precisely timing the gate drive of an external N-channel MOSFET using voltage thresholds on the SRSENSE pin - specifically −310 mV for activation, −55 mV for regulation, and −12 mV for zero-current deactivation - thereby reducing conduction losses and improving overall efficiency. This functionality is integral to the TEA1791T/N1,118's role in modern GreenChip power designs.

Does the TEA1791T/N1,118 support both high-side and low-side synchronous rectification configurations?

Yes, the TEA1791T/N1,118 supports both high-side and low-side SR configurations, as confirmed by Figures 4 and 5 in the official NXP datasheet - which explicitly show application diagrams for "high side rectification" and "low side rectification". The device operates identically in both topologies because its SRSENSE input senses voltage polarity across a sense resistor placed in series with the secondary winding, independent of MOSFET placement. This dual-configurability is a defined feature of the TEA1791T/N1,118 and enables flexible PCB layout in constrained adapter designs.

What is the purpose of the 2 μs blanking time in the TEA1791T/N1,118?

The 2 μs blanking time in the TEA1791T/N1,118 is a built-in timing window activated immediately after driver turn-on to ignore false signals on the SRSENSE pin caused by high-frequency transformer ringing at the start of the secondary stroke. This prevents premature or erratic turn-off of the SR MOSFET, ensuring reliable zero-current switching even in compact, high-density adapters where parasitic ringing is pronounced. The blanking interval is fixed at 2.0 μs (typical) and is an inherent part of the TEA1791T/N1,118's internal control logic - no external components or configuration are required to enable it.

Can the TEA1791T/N1,118 operate reliably at very low duty cycles, such as in high-input-voltage applications?

Yes, the TEA1791T/N1,118 includes a dedicated low-duty-cycle safeguard: if the secondary stroke duration falls below 2.2 μs (typical), the DRIVER output is automatically disabled to prevent unstable or undefined switching behavior. When the stroke exceeds 2.2 μs, the driver resumes normal operation. This feature ensures robust performance in high-V_in applications like 370 V_DC-input telecom supplies, where duty cycle can shrink below 5%. This behavior is specified in the TEA1791T/N1,118's functional description and confirmed in Table 5 of the datasheet.

What is the maximum allowable voltage on the SRSENSE pin of the TEA1791T/N1,118?

The absolute maximum voltage rating for the SRSENSE pin of the TEA1791T/N1,118 is 120 V, as stated in Table 3 ("Limiting values") of the NXP datasheet. This high withstand voltage - enabled by the Silicon-on-Insulator (SOI) fabrication process - allows direct connection to transformer secondary windings without additional clamping or attenuation networks in most DCM and QR flyback implementations. Engineers must ensure that transient spikes do not exceed this limit during surge or startup events, but steady-state operation remains safely within specification for typical adapter designs using the TEA1791T/N1,118.

TEA1791T/N1,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: GreenChip™

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Applications:: Secondary-Side Controller

Voltage - Input:: -

Voltage - Supply:: 8.5V ~ 38V

Current - Supply:: 950 µA

Operating Temperature:: -40°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO

TEA1791T/N1,118 FAQ

1.How can I place an order for TEA1791T/N1,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for TEA1791T/N1,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TEA1791T/N1,118 reliable?

The price and inventory of TEA1791T/N1,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TEA1791T/N1,118 is usually 5 days.

3.What payment methods are accepted for TEA1791T/N1,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TEA1791T/N1,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TEA1791T/N1,118?

TEA1791T/N1,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TEA1791T/N1,118 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TEA1791T/N1,118?

For technical support, including TEA1791T/N1,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TEA1791T/N1,118 requirements.

6.How does Aetrix verify that TEA1791T/N1,118 is sourced from the original manufacturer or authorized distributors?

All TEA1791T/N1,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TEA1791T/N1,118 meets industry standards.

7.What is the process for return or replacement of TEA1791T/N1,118?

All TEA1791T/N1,118 units undergo pre-shipment inspection (PSI). If there is an issue with TEA1791T/N1,118, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TEA1791T/N1,118 part is unused and in its original packaging.

Return procedure for TEA1791T/N1,118:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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