NXP Semiconductors TEA1611T/N1,518

Overview

TEA1611T/N1,518 from NXP Semiconductors is a high-voltage DMOS IC controller for zero-voltage switching (ZVS) resonant half-bridge converters, driving two external power MOSFETs. It integrates a level-shift circuit, current-controlled oscillator with programmable frequency range (156–485 kHz bridge), transconductance error amplifier (gm = 330 µA/mV), and latched shutdown for OVP/OCP/OTP. Used in TV and monitor auxiliary power supplies requiring high-efficiency, low EMI, and stable regulation under varying mains.

For engineers reviewing the TEA1611T/N1,518 datasheet, TEA1611T/N1,518 pinout, TEA1611T/N1,518 application, or TEA1611T/N1,518 equivalent, key selection criteria include its 600 V high-side driver capability, adjustable non-overlap time (0.58–0.68 µs), soft-start timing via CSS pin, UVLO (13.4 V startup / 9.4 V stop), and integrated bootstrap diode (VF = 1.6 V typ).

Technical Context

The TEA1611T/N1,518 implements a current-controlled sawtooth oscillator where bridge frequency is precisely halved via internal ÷2 flip-flop to guarantee 50 % duty cycle. Frequency tuning uses external capacitor Cf (100 pF typical) and three resistors: Rf(min) sets minimum frequency (156 kHz), R∆f sets maximum frequency (440 kHz typ), and Rno defines non-overlap time.

Its transconductance error amplifier (330 µA/mV, 70 dB open-loop gain) feeds current directly into the IRS pin to modulate oscillator charge current, enabling ultra-high-impedance feedback regulation. Protection logic includes latched OCP (via CT timer), OTP (135 °C activation), and 2.33 V threshold shut-down input with internal 12 V clamp during latch.

Key Specifications

Pinout & Package

TEA1611T/N1,518 is housed in a plastic SO20 package (SOT163-1), 7.5 mm body width, 20-pin small outline format with gull-wing leads. Pin 1 is index-marked; pin 7 is not connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar resonant half-bridge controller applications.

Compared with TEA1611T/N1,518, UCC256301DR trades programmability for integration density, while ICE2HS01G sacrifices regulation precision and auxiliary supply flexibility for lower system cost - making TEA1611T/N1,518 optimal for designs requiring tunable ZVS timing and robust multi-rail regulation.

Availability

TEA1611T/N1,518 is available at Aetrix Electronics and suitable for TV power supplies, monitor auxiliary PSUs, and universal-input resonant converters requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TEA1611T/N1,518 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 TEA1611T/N1,518 belongs to NXP's GreenChip™ resonant controller product line, designed specifically for high-efficiency, low-EMI ZVS half-bridge topologies in display and industrial power supplies.

FAQ

What is the function of the VAUX pin on the TEA1611T/N1,518?

The VAUX pin on the TEA1611T/N1,518 accepts an auxiliary supply voltage (0–20 V) to power the internal series regulator that maintains VDD(reg) at 12.6 V during normal operation. This decouples the IC's supply from the main VDD rail, ensuring stable gate drive and oscillator performance even when the primary supply fluctuates or drops during transient load conditions. VAUX is essential when the start-up resistor cannot deliver sufficient current once oscillation begins.

How does the TEA1611T/N1,518 achieve zero-voltage switching (ZVS)?

The TEA1611T/N1,518 achieves ZVS by controlling the half-bridge switching frequency to match the resonant frequency of the external Lr-Cr tank. Its current-controlled oscillator dynamically adjusts bridge frequency (156–485 kHz) based on feedback from the transconductance error amplifier, allowing the voltage across the switches to fall to near zero before turn-on. The integrated non-overlap time (0.63 µs typical) and precise 50 % duty cycle (enforced by internal ÷2 flip-flop) further ensure safe ZVS transitions and prevent shoot-through.

Can the TEA1611T/N1,518 drive both high-side and low-side MOSFETs directly?

Yes, the TEA1611T/N1,518 directly drives both MOSFETs: the GL pin sources/sinks up to 580 mA for the low-side switch, and the GH pin sources/sinks up to 480 mA for the high-side switch. Its integrated high-voltage level shifter and bootstrap diode enable direct high-side gate drive referenced to the SH pin (rated for 600 V), eliminating the need for external level-shifting circuitry or discrete bootstrap diodes in standard half-bridge configurations.

What protections are built into the TEA1611T/N1,518?

The TEA1611T/N1,518 integrates latched OverVoltage Protection (OVP), OverCurrent Protection (OCP) with CT-based timer, UnderVoltage LockOut (UVLO), and OverTemperature Protection (OTP) activating at 135 °C. All protection functions trigger a latched shutdown state, holding GL HIGH and GH LOW to preserve bootstrap charge. Recovery requires either VDD dropping below 5.3 V or asserting the active-low RESET pin - ensuring safe, controlled restart after fault clearance.

What is the purpose of the CSS pin on the TEA1611T/N1,518?

The CSS (soft-start capacitor) pin on the TEA1611T/N1,518 controls the frequency ramp-up during startup. At power-on, it is charged to 2.5 V, setting initial oscillator frequency to ~80 % of maximum. After startup, an internal 15 µA current discharges the external CSS capacitor, causing the VCO pin voltage-and thus bridge frequency-to sweep downward until regulation is achieved. This gradual frequency reduction prevents inrush current and ensures smooth, controlled converter startup.