NXP Semiconductors TEA19161T/2Y

Overview

TEA19161T/2 from NXP Semiconductors is a fully digital LLC resonant controller IC for high-efficiency AC-DC power supplies, featuring primary-side capacitor voltage (V_Cr) regulation, three-mode operation (high-power/low-power/burst), integrated HV start-up, and 500 kHz max half-bridge switching frequency. It enables <75 mW no-load input power in combination with TEA19162T and TEA1995T for 90–500 W desktop, TV, and notebook adapter applications.

For engineers reviewing the TEA19161T/2 datasheet, TEA19161T/2 pinout, TEA19161T/2 application, or TEA19161T/2 equivalent, key selection considerations include V_Cr-based power regulation architecture, externally adjustable mode transition thresholds, integrated SOI-based high-voltage drivers, low-power mode duty-cycle control, and compliance with Energy Star, DoE Level VI, and EU Eco-design directives.

Technical Context

The TEA19161T/2 implements a digital control loop that regulates output power by directly sensing and controlling the divided voltage across the LLC resonant capacitor (SNSCAP), not by frequency modulation-enabling linear power-to-voltage relationship and constant-loop gain. It integrates dual-die architecture: a low-voltage digital core for logic, protection, and mode sequencing, and a high-voltage SOI controller for HV start-up (SUPHV), level shifting, gate driving, and capacitive mode regulation (CMR).

Operation spans three distinct modes: high-power mode (continuous switching, 50–500 kHz), low-power mode (3-half-cycle bursts with fixed 67% duty cycle and adaptive ΔV_SNSCAP), and burst mode (200–1600 Hz regulated burst frequency with extended hold periods). Mode transitions are set via external resistors on SNSSET and monitored using real-time V_Cr and optocurrent (SNSFB) feedback.

Key Specifications

Pinout & Package

TEA19161T/2 is housed in a plastic small outline package (SO16) with 16 leads and 3.9 mm body width (SOT109-1), optimized for surface-mount assembly and thermal performance in high-density power supply layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LLC resonant controller applications.

Compared with UCC256301 and ICE2HS01G, the TEA19161T/2 uniquely delivers V_Cr-based power regulation, factory-trimmed low-power mode timing, and integrated digital PFC coordination-enabling higher light-load efficiency, simpler compensation, and fewer external components in 90–500 W resonant systems.

Availability

TEA19161T/2 is available at Aetrix Electronics and suitable for desktop PC power supplies, LCD television PSUs, notebook adapters, and office printer power systems requiring stable component supply, long-term lifecycle support, and compliance with global energy regulations.

Supply support for TEA19161T/2 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 TEA19161T/2 belongs to NXP's GreenChip™ family of high-efficiency AC-DC controllers, designed specifically to meet stringent global energy efficiency standards-including DoE Level VI, EU Eco-design, and Energy Star-while simplifying resonant power supply design.

FAQ

What is the primary regulation method used by the TEA19161T/2?

The TEA19161T/2 uses primary-side resonant capacitor voltage (V_Cr) sensing-not frequency modulation-as its core regulation method. By continuously monitoring the divided voltage across the LLC resonant capacitor (SNSCAP pin), it calculates instantaneous output power and adjusts switching edges to maintain regulation. This approach provides linear power-to-voltage response, eliminates sensitivity to resonant component tolerances, and ensures stable loop gain across temperature and load, distinguishing TEA19161T/2 from conventional frequency-controlled LLC controllers.

How does the TEA19161T/2 achieve <75 mW no-load input power?

The TEA19161T/2 achieves <75 mW no-load input power through coordinated system-level optimization: regulated 85 µA optocurrent (SNSFB), V_Cr-based burst-mode activation, ultra-low quiescent current in non-switching states, and elimination of auxiliary supplies. When paired with TEA19162T and TEA1995T, the TEA19161T/2 dynamically disables PFC and enters extended hold periods during burst mode-reducing total system losses. Its integrated HV start-up and SUPIC regulation further minimize leakage paths, enabling compliance with strict global no-load requirements without external circuitry.

What are the key differences between high-power, low-power, and burst modes in the TEA19161T/2?

In high-power mode, the TEA19161T/2 operates continuously at 50–500 kHz, regulating power via ΔV_SNSCAP. In low-power mode, it executes 3-half-cycle bursts with 67% duty cycle and adaptive energy-per-cycle reduction-cutting magnetization losses by 33%. In burst mode, it alternates low-power periods with extended hold states at 200–1600 Hz regulated frequency. All modes use the same V_Cr sensing architecture, but differ in timing granularity, loss mechanisms addressed, and acoustic profile-enabling optimal efficiency from full load to standby.

Can the TEA19161T/2 be used without the TEA19162T PFC controller?

Yes, the TEA19161T/2 can operate standalone with an external PFC stage or non-PFC front-end, but full system benefits-including coordinated burst-mode activation, digital PFC disable signaling (via SNSBOOST), and optimized no-load performance-are only realized when used with the TEA19162T. The TEA19161T/2's SNSBOOST pin is designed to interface directly with TEA19162T for synchronized start-up and protection handshaking; standalone use requires external logic to replicate this signaling and may increase no-load power or reduce transient robustness.

What protection features are integrated into the TEA19161T/2?

The TEA19161T/2 integrates comprehensive hardware-based protections: overcurrent protection (OCP) on SNSCUR, overvoltage protection (OVP) on SNSFB, overpower protection (OPP) with adjustable timeout and latch/restart selection (SNSSET), on-chip overtemperature protection (OTP), capacitive mode regulation (CMR), supply undervoltage protection (UVP) on SUPIC/SUPREG, and maximum on-time limiting for both GATEHS and GATELS outputs. These operate independently of firmware, respond within nanoseconds, and require no external components-ensuring robust fault handling across line surges, short circuits, and thermal overload conditions.