NXP Semiconductors TEA1795T/N1,118

Overview

TEA1795T/N1,118 from NXP Semiconductors is a dual-channel synchronous rectifier (SR) controller IC for resonant and multi-output flyback power supplies. It drives two external SR MOSFETs on the secondary side of center-tapped transformer windings, features independent sensing per channel (DSA/SSA and DSB/SSB), operates from 8.5 V to 38 V supply, and delivers 10 V gate drive with 2.7 A sink current. It enables high-efficiency AC-DC adapters and server PSUs.

For engineers reviewing the TEA1795T/N1,118 datasheet, TEA1795T/N1,118 pinout, TEA1795T/N1,118 application, or TEA1795T/N1,118 equivalent, key selection criteria include dual independent SR timing control, −220 mV activation threshold, 520 ns minimum active time, UVLO with 8.5 V startup, and SO8 package compatibility for compact secondary-side layout.

Technical Context

The TEA1795T/N1,118 implements dual independent synchronous rectification channels using drain-source voltage sensing (DSA–SSA and DSB–SSB) to trigger and regulate gate drive timing. Each channel employs a dedicated comparator with −220 mV activation, −25 mV regulation, and −12 mV zero-current detection thresholds, plus blanking timers (520 ns active min, 400 ns off min) to suppress ringing-induced false turn-off.

Its SOI process enables robust operation up to 120 V drain sense voltage and supports fast switching up to 500 kHz. The gate drivers deliver 400 mA source / 2.7 A sink current with 10 V clamped output, ensuring low R_DS(on) conduction across diverse MOSFET brands while maintaining active low-state during UVLO.

Key Specifications

Pinout & Package

TEA1795T/N1,118 is housed in an SO8 plastic small outline package (SOT96-1), 3.9 mm body width, 1.27 mm lead pitch, JEDEC-standard footprint compatible with automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4303DR2G and SiHP12N50C-E3, TEA1795T/N1,118 provides integrated dual-channel timing, higher voltage robustness, and SOI-based noise immunity-making it uniquely suited for high-efficiency resonant and multi-output secondary-side rectification without added timing components.

Availability

TEA1795T/N1,118 is available at Aetrix Electronics and suitable for adapter power supplies, ATX/server PSUs, and LCD television power systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TEA1795T/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, automotive processors, and high-efficiency power management ICs.

The TEA1795T/N1,118 belongs to NXP's GreenChip family-designed specifically for energy-efficient AC-DC conversion in consumer, computing, and industrial power supplies, with emphasis on synchronous rectification and resonant topology optimization.

FAQ

What is the primary function of the TEA1795T/N1,118 in a power supply?

The TEA1795T/N1,118 is a dual-channel synchronous rectifier controller that replaces secondary-side diodes with MOSFETs in resonant and flyback converters. It senses drain-source voltage across each MOSFET to precisely time gate drive signals-reducing conduction loss and improving efficiency from no-load to full-load. Its independent channel architecture makes TEA1795T/N1,118 ideal for multi-output or center-tapped transformer designs.

Does the TEA1795T/N1,118 require external components for basic operation?

Yes-the TEA1795T/N1,118 requires two 1 kΩ resistors in series with each drain sense input (DSA and DSB) for overvoltage protection, plus local bypass capacitors on VCC and proper PCB layout for sense pins. No external timing components or feedback optocouplers are needed, as all timing and regulation are internal. This minimal external count is a core design advantage of TEA1795T/N1,118.

How does the TEA1795T/N1,118 handle zero-current detection?

The TEA1795T/N1,118 detects zero current by monitoring the voltage difference between its drain and source sense inputs (DSA–SSA and DSB–SSB). When this difference rises above −12 mV (typical), it initiates a 400 ns minimum off-timer before allowing the next conduction cycle. This ensures clean turn-off before reverse conduction occurs-critical for maintaining high efficiency in TEA1795T/N1,118-based resonant supplies.

What is the significance of the SOI process used in the TEA1795T/N1,118?

The Silicon-On-Insulator (SOI) process in TEA1795T/N1,118 provides inherent isolation between substrate and active devices, enabling higher voltage tolerance (120 V drain sense), improved noise immunity in high-dI/dt environments, and reduced latch-up risk. This makes TEA1795T/N1,118 especially robust in resonant converters where fast switching edges and transformer leakage induce large transient voltages.

Can the TEA1795T/N1,118 be used in non-resonant topologies like conventional flyback?

Yes-the TEA1795T/N1,118 supports both resonant (LLC) and multi-output flyback topologies, as confirmed in its application diagrams and functional description. Its wide 8.5–38 V supply range, independent channel timing, and −220 mV activation threshold allow reliable operation across varying duty cycles and voltage stresses encountered in flyback designs. TEA1795T/N1,118 is explicitly validated for such use in NXP's official documentation.