NXP Semiconductors UBA2024AP/N1,112

Overview

UBA2024AP/N1,112 from NXP Semiconductors is a monolithic high-voltage half-bridge power IC designed for compact fluorescent lamp (CFL) electronic ballasts operating from 230 V mains. It integrates dual MOSFETs (R_DS(on) = 6.5 Ω HS / 5.7 Ω LS), an adjustable internal oscillator (41.32 kHz typ.), soft-start, and high-voltage level shifting up to 550 V. It delivers accurate 50 % duty cycle via internal divide-by-2 logic and supports lamps up to 23 W.

For engineers reviewing the UBA2024AP/N1,112 datasheet, UBA2024AP/N1,112 pinout, UBA2024AP/N1,112 application, or UBA2024AP/N1,112 equivalent, this device serves as a fully integrated CFL driver requiring no external low-voltage supply, offering design simplification for self-ballasted lamp modules with sweep-mode ignition and thermal-safe operation.

Technical Context

The UBA2024AP/N1,112 implements a self-oscillating 555-timer-based architecture with external ROSC/COSC timing components, where the oscillator output is divided by two to ensure precise 50 % bridge duty cycle. Its high-side driver incorporates a DC reset circuit with floating supply undervoltage lockout (V_float(UVLO) = 4.2 V typ.) and integrated bootstrap diode (V_F = 1.0 V typ.).

During start-up, the IC enters a controlled sweep mode: the SW pin capacitor charges at 280 nA typ., generating a frequency sweep from 2.5× nominal down to resonance (e.g., ~41 kHz → ~16 kHz), enabling reliable lamp ignition without external preheat control. Non-overlap time is fixed internally at 1.35 μs typ. to prevent shoot-through.

Key Specifications

Pinout & Package

DIP8 plastic dual in-line package (SOT97-1), 300 mil width, 8 leads, through-hole mount. Thermal resistance R_th(j-c) = 16 K/W; suitable for PCBs with moderate copper pour and natural convection cooling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CFL driver applications.

Compared with UBA2024P/N1,112, the UBA2024AP/N1,112 delivers 30 % lower conduction loss and 50 % higher saturation current for 23 W operation; versus UBA2024AT/N1,118, it offers identical electrical performance in through-hole form factor-ideal for prototyping and legacy manufacturing lines.

Availability

UBA2024AP/N1,112 is available at Aetrix Electronics and suitable for compact fluorescent lamp ballasts, 230 V mains-powered lighting modules, and energy-efficient retrofit lamp designs requiring stable component supply and long-term lifecycle support.

Supply support for UBA2024AP/N1,112 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 UBA2024 family was developed specifically for high-efficiency, low-component-count electronic ballasts targeting compact fluorescent lamps - emphasizing integration, reliability, and compliance with international mains surge standards.

FAQ

What is the maximum lamp power supported by the UBA2024AP/N1,112?

The UBA2024AP/N1,112 is rated for driver applications up to 23 W, provided the junction temperature remains within −40 °C to +150 °C limits. This rating assumes proper heatsinking in the DIP8 package and adherence to thermal derating curves in the datasheet. The IC's 6.5 Ω high-side R_DS(on) and 1350 mA saturation current enable stable operation at this power level under 230 V mains conditions. UBA2024AP/N1,112 must not be operated beyond its specified thermal and voltage limits.

Does the UBA2024AP/N1,112 require an external low-voltage supply?

No. The UBA2024AP/N1,112 derives its internal low-voltage supply (VDD ≈ 12.5 V) directly from the high-voltage mains input applied to the HV pin. An integrated regulator eliminates the need for auxiliary windings, linear regulators, or external DC-DC converters. This self-powered architecture simplifies CFL ballast design and improves system efficiency. UBA2024AP/N1,112 operates reliably across the full 100–373 V HV input range.

How does the sweep-mode function work in the UBA2024AP/N1,112?

The UBA2024AP/N1,112 uses an internal 280 nA current source to charge the external capacitor on the SW pin, generating a controlled voltage ramp that sweeps the oscillator frequency from 2.5× nominal down to resonance. This preheats lamp filaments and ensures reliable ignition without external timing components. The sweep time is programmable (e.g., 350 ms with 33 nF). UBA2024AP/N1,112 implements this entirely on-die with no firmware or external control required.

What is the purpose of the FS pin on the UBA2024AP/N1,112?

The FS (floating supply) pin provides the gate drive voltage for the high-side MOSFET via an external bootstrap capacitor. It features an integrated undervoltage lockout (UVLO) with 4.2 V threshold to prevent erroneous high-side conduction during low-voltage conditions. The FS pin supports up to 564 V absolute maximum, enabling robust operation during 230 V mains transients. UBA2024AP/N1,112 integrates the bootstrap diode, eliminating the need for an external component.

Can the UBA2024AP/N1,112 be used with 120 V mains input?

No - the UBA2024AP/N1,112 is optimized for 230 V mains operation and rated for 550 V transients. For 120 V applications, NXP specifies the UBA2024B variant (e.g., UBA2024BP/N1,112), which has lower R_DS(on) (2.0 Ω), higher saturation current (2500 mA), and reduced HV rating (300 V). Using UBA2024AP/N1,112 on 120 V systems would result in suboptimal efficiency and potential overvoltage stress on internal nodes. Always match the UBA2024 variant to the target mains voltage.