NXP Semiconductors TEA1611T/N2,518

Overview

TEA1611T/N2,518 from NXP Semiconductors is a high-voltage DMOS-based zero-voltage switching (ZVS) resonant converter controller IC for half-bridge topologies. It integrates high-side level-shifting, bootstrap diode, transconductance error amplifier, latched shutdown, and programmable oscillator with 156–485 kHz bridge frequency range. It drives two discrete MOSFETs in TV and monitor power supplies requiring high-efficiency, low EMI, and green-mode start-up.

For engineers reviewing the TEA1611T/N2,518 datasheet, TEA1611T/N2,518 pinout, TEA1611T/N2,518 application, or TEA1611T/N2,518 equivalent, key selection criteria include its 600 V high-side driver capability, adjustable non-overlap time, integrated OTP/OCP/UVLO protection, and ultra-high-ohmic feedback compatibility via transconductance amplifier - critical for stable ZVS operation under varying line conditions.

Technical Context

The TEA1611T/N2,518 implements a current-controlled sawtooth oscillator where bridge frequency is set by external CF capacitor and IFS/IRS currents, enabling precise min/max frequency tuning (156–485 kHz) and non-overlap time control via Rno. Its divide-by-two flip-flop ensures strict 50 % duty cycle at the output drivers.

It features dual supply handling: VDD(FLOAT) supports up to 600 V high-side gate drive, while VAUX accepts up to 20 V auxiliary input for regulated VDD generation. Protection functions include latched OVP via SD pin (2.33 V threshold), OCP with shut-down timer (CT pin), and OTP activation at 120–150 °C.

Key Specifications

Pinout & Package

TEA1611T/N2,518 is housed in SO20 package (SOT163-1), 20-pin plastic small outline, 7.5 mm body width, with exposed thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar zero-voltage switching resonant controller applications.

Compared with UCC256301DR and ICE2HS01G, the TEA1611T/N2,518 offers superior analog design flexibility via external resistor-capacitor oscillator tuning, precise non-overlap control, and ultra-high-ohmic feedback support - making it optimal for custom ZVS resonant supplies demanding reliability and layout adaptability.

Availability

TEA1611T/N2,518 is available at Aetrix Electronics and suitable for TV power supplies, monitor power supplies, and high-voltage industrial PSUs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TEA1611T/N2,518 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 leader specializing in secure connectivity solutions for automotive, industrial, and consumer applications, with core expertise in high-voltage analog and power management ICs.

The TEA1611T/N2,518 belongs to NXP's GreenChip™ resonant controller product line, designed specifically for high-efficiency, low-EMI ZVS power supplies targeting energy-conscious display and industrial markets.

FAQ

What is the maximum high-side voltage rating supported by the TEA1611T/N2,518?

The TEA1611T/N2,518 supports a maximum high-side driver voltage (Vdrv(hs)) of 600 V on pins VDD(FLOAT), GH, and SH, enabling direct integration into half-bridge resonant converters operating from universal AC mains without external level-shifting circuitry. This rating is specified per IEC 60134 limiting values and verified under continuous operation at Tamb ≤ 70 °C.

How does the TEA1611T/N2,518 achieve zero-voltage switching (ZVS) in practice?

The TEA1611T/N2,518 achieves ZVS by precisely controlling the half-bridge switching frequency (156–485 kHz) to match the resonant tank's natural frequency, allowing MOSFETs to turn on only when drain-source voltage crosses zero. Its current-controlled oscillator, non-overlap time adjustment, and 50 % duty cycle accuracy ensure reliable ZVS across load and line variations without requiring auxiliary sensing circuits.

Can the TEA1611T/N2,518 operate with only the VAUX supply and no VDD connection?

No - the TEA1611T/N2,518 requires VDD to be present during initial start-up (minimum 4 V) to activate the low-side driver and charge the bootstrap capacitor. Once oscillation begins, VAUX (0–20 V) can sustain VDD regulation, but VAUX alone cannot initiate operation. The datasheet specifies VDD(init) = 4–5 V and VDD(startup) = 12.9–13.9 V as mandatory thresholds.

What is the function of the n.c. pin (Pin 7) on the TEA1611T/N2,518?

Pin 7 on the TEA1611T/N2,518 is explicitly designated as "not connected" and serves as an internal high-voltage spacer. It must remain unconnected on the PCB layout - no trace, pad, or solder should contact this pin. Connecting it risks compromising internal isolation and may cause malfunction or premature failure under high dv/dt conditions.

Does the TEA1611T/N2,518 include built-in overtemperature protection?

Yes - the TEA1611T/N2,518 includes integrated OverTemperature Protection (OTP) that activates at junction temperatures between 120 °C and 150 °C (Totp(act)), forcing the IC into latched shutdown mode. Recovery requires either lowering VDD below 4.5–6.0 V or asserting the active-low RESET pin. This feature is confirmed in Section 7.10 and Table 5 of the official NXP datasheet.