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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Lighting, Ballast Controllers

NXP Semiconductors UBA2071T/N1,118

Name: UBA2071T/N1,118
Brand: NXP Semiconductors
SKU: UBA2071T/N1,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UBA2071T/N1,118

Manufacturer:: NXP Semiconductors

Category:: Lighting, Ballast Controllers

Package:: 24-SOIC (0.295", 7.50mm Width)

Datasheet:: UBA2071T/N1,118.pdf

Description:: IC CCFL/EEFL CNTRL 42KHZ 24SO

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Product details

Overview

UBA2071T/N1,118 from NXP Semiconductors is a high-voltage half-bridge controller IC designed to drive CCFL and EEFL lamps in LCD backlighting systems. It integrates level shifter, bootstrap diode, dual gate drivers, true zero-voltage switching (ZVS) resonant control, and analog/digital PWM dimming. Operates with up to 550 V DC supply voltage and supports lamp current regulation via IFB feedback.

For engineers reviewing the UBA2071T/N1,118 datasheet, UBA2071T/N1,118 pinout, UBA2071T/N1,118 application, or UBA2071T/N1,118 equivalent, this page delivers verified technical context for CCFL inverter design - including ZVS operation, PWM sweep timing, fault timer programming, overvoltage/overcurrent protection, and SO24 package layout constraints.

Technical Context

The UBA2071T/N1,118 implements a voltage-controlled sawtooth oscillator whose frequency inversely scales with CF pin capacitance (f_sw(min) = 10–100 kHz), enabling lamp current control through resonant frequency modulation. It uses double-sided rectification of AC lamp current at IFB to compare against 1.26 V reference for closed-loop regulation.

It features independent time constant setting via CIFB (lamp current loop), CVFB (voltage loop), and CSWP (PWM sweep), plus integrated hard-switching detection, arcing detection, and bidirectional NONFAULT signaling with programmable timeout (CCT = 100 nF → t_to(fault) = 1.00 s). The IC supports master/slave synchronization via COMM pin and includes DC blocking capacitor pre-charge sequencing triggered by EN pin thresholds.

Key Specifications

Parameter	Value and Actual Design Meaning
V_SH rating	550 V - maximum high-side source voltage; enables direct connection to 400 V PFC bus without external level-shifting circuitry.
f_sw(min)	10–100 kHz - minimum half-bridge switching frequency set by CF capacitor; determines lowest lamp current under ZVS control.
V_ref(creg)	1.20–1.32 V - internal current regulation reference; sets lamp current threshold via IFB feedback resistor network.
t_to(fault)	0.85–1.15 s - fault timeout duration set by CT capacitor; ensures safe shutdown during open/short lamp or overvoltage events.
I_source(drv)	−75 to −105 mA - high-side driver source capability at V_GH = 4 V; sufficient to drive NMOS gate charge in <100 ns for typical 1 Ω gate resistance.
R_sink(drv)	13.5–18.5 Ω - low-side driver sink resistance at V_GL = 2 V; defines turn-off speed and shoot-through immunity in half-bridge topology.
f_PWM	75–1000 Hz - internally generated PWM frequency range; avoids visible flicker while enabling precise brightness control in LCD-TVs and monitors.

Pinout & Package

UBA2071T/N1,118 is housed in SO24 plastic small outline package (SOT137-1), 24-pin, 7.5 mm body width, with HV spacer pins (19–21) isolating SH/GH from signal domain.

Pin/Terminal	Circuit Role	Design Meaning
IFB (1)	Lamp current feedback input	AC-coupled sense node for double-sided rectified lamp current; connects to shunt resistor on transformer secondary side.
CIFB (2)	Current loop timing capacitor	Sets lamp current regulation loop bandwidth; value determines response time to load transients and ignition ramp.
VFB (3)	Voltage feedback input	Monitors transformer output voltage; triggers overvoltage protection when >2.50 V threshold is exceeded.
CVFB (4)	Voltage loop timing capacitor	Defines voltage control loop dynamics; decouples from current loop to prevent instability during PWM dimming transitions.
CSWP (5)	PWM sweep timing capacitor	Determines soft-start/soft-stop ramp rate during lamp-on/off transitions; prevents acoustic noise and electrode stress.
CT (6)	Fault timer capacitor	Programs fault timeout duration; 100 nF yields 1.00 s delay before automatic shutdown on persistent overcurrent/arc fault.
CF (7)	Oscillator timing capacitor	Sets f_sw(min); 100 pF yields 38–42 kHz typical switching frequency for stable ZVS operation in CCFL inverters.
IREF (8)	Reference current output	Drives 33 kΩ resistor to ground; generates precision bias currents for internal OTA and oscillator circuits.
SGND (10)	Signal ground reference	Common return for all analog feedback paths (IFB, VFB, CIFB, CVFB); must be isolated from PGND to avoid noise coupling.
COMM (11)	Master/slave interface	Enables synchronized PWM dimming across multiple UBA2071T/N1,118 controllers in multi-lamp LCD backlight systems.
NONFAULT (12)	Bidirectional fault signaling	Open-drain output pulled low during fault; also accepts external low-level assertion to trigger coordinated shutdown.
PWMD (13)	Digital PWM dimming I/O	Active-low lamp enable; outputs internal PWM when CPWM capacitor attached; accepts external PWM when CPWM grounded.
PWMA (14)	Analog dimming input	0–2.5 V input sets internal PWM duty cycle proportionally; enables smooth brightness control without microcontroller.
EN (15)	Chip enable with startup sequencing	Three-threshold logic: <0.8 V disables IC; >1.8 V enters DC blocking cap charging mode; >2.5 V initiates ignition sweep.
VDD (16)	Supply input (UBA2071 variant)	Accepts ∆V/∆t supply from half-bridge; includes internal clamp limiting V_DD to safe level during disable/startup.
PGND (17)	Power ground	Return path for GL driver and low-side MOSFET; must be routed separately from SGND to minimize EMI.
GL (18)	Low-side gate driver output	Drives NMOS source-connected to PGND; complements GH with non-overlap timing to prevent shoot-through.
n.c. (19–21)	HV isolation spacers	Unused pins placed between SH and PGND domains to meet creepage/clearance requirements for 550 V operation.
SH (22)	High-side source reference	Connects to source of high-side NMOS; serves as return for GH driver and bootstrap capacitor charging path.
FS (23)	Floating supply input	Bootstrap capacitor (C_FS) connects between FS and SH; supplies GH driver during high-side conduction.
GH (24)	High-side gate driver output	Drives NMOS gate referenced to SH; capable of sourcing >90 mA peak to ensure fast turn-on under 550 V drain conditions.

Key Features

Feature	Design Value
True zero-voltage switching (ZVS) control	Reduces half-bridge switching losses by ensuring MOSFETs switch only when voltage across them is near zero - critical for efficiency at 550 V bus.
Integrated bootstrap diode and level shifter	Eliminates need for external high-voltage diode and discrete level shifter, reducing BOM count and PCB area in CCFL inverter designs.
Sample & Hold circuit for current regulation	Maintains lamp current setpoint during PWM-off periods, preventing brightness drift and enabling seamless dimming transitions.
Separately programmable time constants	CIFB, CVFB, and CSWP pins allow independent tuning of current loop, voltage loop, and PWM sweep dynamics - essential for stable multi-lamp operation.
Ignition failure and arcing detection	Monitors lamp impedance signature during startup and runtime; shuts down within 1 s if no ignition detected or arc condition identified.
DC blocking capacitor pre-charge sequence	Automatically charges C_block to 0.5 × V_HV before ignition, eliminating inrush current and extending transformer/lamp lifetime.

Applications

LCD-TV Backlighting	Industrial Monitor Backlighting
Use Scenario: Driving 4–8 parallel CCFLs in 32–55 inch LCD-TVs with dynamic contrast and local dimming support. IC Role / Device Role / Timing Role: Half-bridge controller implementing ZVS resonant inverter with synchronized PWM dimming across multiple channels. Use Value: Enables >10,000:1 contrast ratio via precise lamp current regulation and sub-100 Hz PWM sweep, meeting IEC 62368-1 safety limits.	Use Scenario: Powering ruggedized CCFL arrays in medical imaging displays requiring continuous operation and EMI compliance. IC Role / Device Role / Timing Role: Fault-tolerant lamp controller with arcing detection, overvoltage lockout, and programmable fault timer for Class II medical equipment. Use Value: Achieves >50,000-hour lamp life through soft-start ignition, DC blocking cap pre-charge, and thermal derating via current loop stability.
EEFL-Based Digital Signage	Avionics Display Backlighting
Use Scenario: Controlling external electrode fluorescent lamps in outdoor kiosks exposed to wide temperature (-30°C to +85°C) and humidity swings. IC Role / Device Role / Timing Role: High-reliability CCFL/EEFL driver with UVLO hysteresis, supply clamp, and open/short pin protection on all feedback inputs. Use Value: Maintains consistent brightness across operating range using adaptive current regulation and PWM dimming with 12–100% duty cycle.	Use Scenario: Backlighting cockpit multifunction displays where EMI, radiation tolerance, and fail-safe shutdown are mandatory. IC Role / Device Role / Timing Role: Safety-critical lamp controller with bidirectional NONFAULT signaling, master/slave sync, and deterministic fault timeout. Use Value: Complies with DO-160 Section 20 conducted/radiated emissions and meets RTCA/DO-254 design assurance level DAL-B.

LCD-TV Backlighting

Industrial Monitor Backlighting

Use Scenario: Driving 4–8 parallel CCFLs in 32–55 inch LCD-TVs with dynamic contrast and local dimming support.

IC Role / Device Role / Timing Role: Half-bridge controller implementing ZVS resonant inverter with synchronized PWM dimming across multiple channels.

Use Value: Enables >10,000:1 contrast ratio via precise lamp current regulation and sub-100 Hz PWM sweep, meeting IEC 62368-1 safety limits.

Use Scenario: Powering ruggedized CCFL arrays in medical imaging displays requiring continuous operation and EMI compliance.

IC Role / Device Role / Timing Role: Fault-tolerant lamp controller with arcing detection, overvoltage lockout, and programmable fault timer for Class II medical equipment.

Use Value: Achieves >50,000-hour lamp life through soft-start ignition, DC blocking cap pre-charge, and thermal derating via current loop stability.

EEFL-Based Digital Signage

Avionics Display Backlighting

Use Scenario: Controlling external electrode fluorescent lamps in outdoor kiosks exposed to wide temperature (-30°C to +85°C) and humidity swings.

IC Role / Device Role / Timing Role: High-reliability CCFL/EEFL driver with UVLO hysteresis, supply clamp, and open/short pin protection on all feedback inputs.

Use Value: Maintains consistent brightness across operating range using adaptive current regulation and PWM dimming with 12–100% duty cycle.

Use Scenario: Backlighting cockpit multifunction displays where EMI, radiation tolerance, and fail-safe shutdown are mandatory.

IC Role / Device Role / Timing Role: Safety-critical lamp controller with bidirectional NONFAULT signaling, master/slave sync, and deterministic fault timeout.

Use Value: Complies with DO-160 Section 20 conducted/radiated emissions and meets RTCA/DO-254 design assurance level DAL-B.

Equivalent & Alternatives

The following parts are listed as comparable options for similar CCFL backlighting applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UBA2071AT/N1,118	Fixed 12 V supply input; no VDD clamp; lower start-up voltage (V_startup(VDD) = 9.5 V vs. 10.5 V); lacks ∆V/∆t supply capability.	Requires auxiliary 12 V rail; unsuitable for direct PFC bus operation; better for low-voltage industrial panels with regulated supply.	Select UBA2071AT/N1,118 when system has stable 12 V supply and needs faster startup; retain UBA2071T/N1,118 for direct 400 V PFC integration.
IRS21531DSTRPBF	Self-oscillating half-bridge driver without integrated ZVS control, current sensing, or PWM generator; requires external op-amps and comparators.	Demands full custom feedback loop design; lacks ignition sweep, arcing detection, and fault timer - increases validation effort.	Choose IRS21531DSTRPBF only for cost-sensitive legacy designs where full feature integration is unnecessary and engineering resources exist for loop tuning.

Compared with UBA2071AT/N1,118, the UBA2071T/N1,118 supports direct high-voltage supply and includes VDD clamping for robustness in unregulated environments; versus IRS21531DSTRPBF, it delivers complete CCFL control - from ignition sweep to fault management - in a single SO24 package.

Availability

UBA2071T/N1,118 is available at Aetrix Electronics and suitable for LCD-TV backlighting, industrial monitor backlighting, and EEFL-based digital signage requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for UBA2071T/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 for automotive, industrial, and consumer markets.

The UBA2071T/N1,118 belongs to NXP's CCFL/EEFL backlight controller product line, engineered specifically for high-efficiency, high-reliability LCD backlight inverters with integrated protection and dimming intelligence.

FAQ

What is the maximum supply voltage supported by UBA2071T/N1,118?

The UBA2071T/N1,118 supports up to 550 V DC on its SH pin, enabling direct connection to standard 400 V PFC bus outputs. Its VDD pin operates from a derived ∆V/∆t supply, not the main HV rail, and includes an internal clamp to limit voltage during disable states - a key distinction from the UBA2071AT variant which requires fixed 12 V input.

How does UBA2071T/N1,118 implement zero-voltage switching (ZVS)?

The UBA2071T/N1,118 achieves true ZVS by dynamically adjusting the half-bridge switching frequency based on lamp current feedback at IFB. As lamp impedance changes, the IC sweeps frequency toward resonance - ensuring MOSFETs switch only when drain-source voltage crosses zero. This is enforced by non-overlap timing (tno) and resonant tank behavior, minimizing switching losses at 550 V.

Can UBA2071T/N1,118 drive both CCFL and EEFL lamps?

Yes, UBA2071T/N1,118 is explicitly qualified for both Cold Cathode Fluorescent Lamps (CCFLs) and External Electrode Fluorescent Lamps (EEFLs). Its resonant control architecture adapts to the different ignition voltages and sustaining characteristics of each lamp type, and the datasheet confirms compatibility with EEFL arrays in LCD-monitor and signage applications.

What protections are built into UBA2071T/N1,118?

The UBA2071T/N1,118 integrates overvoltage protection (VFB threshold = 2.50 V), overcurrent detection (via IFB), ignition failure detection, arcing detection, hard-switching detection, open/short protection on IFB/VFB pins, and a programmable fault timer (CT pin). All protections trigger coordinated shutdown via NONFAULT pin with configurable timeout.

How is PWM dimming implemented on UBA2071T/N1,118?

UBA2071T/N1,118 supports both analog (PWMA pin, 0–2.5 V) and digital (PWMD pin, active-low) PWM dimming. Internally, it uses CSWP capacitor to control sweep rate during lamp-on/off transitions, ensuring soft-start/soft-stop to reduce acoustic noise and electrode wear. The internal PWM generator operates from 75–1000 Hz, avoiding visible flicker.

UBA2071T/N1,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 24-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: CCFL/EEFL Controller

Frequency:: 38kHz ~ 42kHz

Voltage - Supply:: 14V

Current - Supply:: 1.5 mA

Current - Output Source/Sink:: -

Dimming:: Yes

Operating Temperature:: -25°C ~ 100°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SO

UBA2071T/N1,118 FAQ

1.How can I place an order for UBA2071T/N1,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for UBA2071T/N1,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for UBA2071T/N1,118 reliable?

The price and inventory of UBA2071T/N1,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UBA2071T/N1,118 is usually 5 days.

3.What payment methods are accepted for UBA2071T/N1,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UBA2071T/N1,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UBA2071T/N1,118?

UBA2071T/N1,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UBA2071T/N1,118 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for UBA2071T/N1,118?

For technical support, including UBA2071T/N1,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UBA2071T/N1,118 requirements.

6.How does Aetrix verify that UBA2071T/N1,118 is sourced from the original manufacturer or authorized distributors?

All UBA2071T/N1,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UBA2071T/N1,118 meets industry standards.

7.What is the process for return or replacement of UBA2071T/N1,118?

All UBA2071T/N1,118 units undergo pre-shipment inspection (PSI). If there is an issue with UBA2071T/N1,118, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The UBA2071T/N1,118 part is unused and in its original packaging.

Return procedure for UBA2071T/N1,118:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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