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NXP Semiconductors UBA2072T/N1,518
- Part No.:
- UBA2072T/N1,518
- Manufacturer:
- NXP Semiconductors
- Category:
- Lighting, Ballast Controllers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UBA2072T/N1,518.pdf
- Description:
- IC CCFL/EEFL CNTRL 46.6KHZ 28SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,632
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Product details
Overview
UBA2072T/N1,518 from NXP Semiconductors is a low-voltage full-bridge control IC designed specifically for Cold Cathode Fluorescent Lamp (CCFL) backlighting in LCD displays. It integrates level-shifters, bootstrap diodes, and gate drivers for external MOSFETs; features an internal HF oscillator (43–47 kHz min), phase-shift control for lamp current regulation, and PWM dimming with 100–1000 Hz frequency range. It operates from 9 V to 30 V DC and drives resonant full-bridge inverters in LCD-TV and monitor backlight systems.
For engineers reviewing the UBA2072T/N1,518 datasheet, UBA2072T/N1,518 pinout, UBA2072T/N1,518 application, or UBA2072T/N1,518 equivalent, this page delivers verified functional architecture, SO28 package mapping, lamp current/voltage feedback loop design values, fault timing capacitor relationships, and real-world CCFL ignition and dimming behavior - all critical for inverter power stage layout and reliability validation.
Technical Context
The UBA2072T/N1,518 implements dual-loop control: a voltage feedback loop (via VFB/CVFB pins) regulates transformer output during ignition by modulating switching frequency, while a current feedback loop (via IFB/CIFB pins) maintains constant lamp current post-ignition using phase-shift adjustment between bridge halves A and B. The internal HF oscillator sets base frequency, and its output is swept from Fs(max) ≈ 105 kHz down to Fs(min) ≈ 44.8 kHz to match resonant load impedance.
Phase-shift control is executed via CSWP pin voltage (1–3 V range), which directly maps to ∆φ = 0°–180°; PWM dimming operates asynchronously to frequency sweep and uses either internal CPWM-timed generation or external digital signal on PWMd (active-low). Fault handling includes four independent protections - overvoltage, overcurrent, arcing, and ignition failure - each triggering a 15-cycle CT-pin timer before shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 9 V to 30 V DC - enables direct connection to inverter supply rails without external regulator; VDD regulated at 12 V ±0.7 V powers gate drivers. |
| Min Switching Frequency | 44.8 kHz (typ) - sets stable operating point for loaded CCFL resonance; determined by CF capacitor value. |
| Lamp Current Regulation | Voltage reference VIFB(reg) = 1.32 V (typ) - defines setpoint for double-side rectified IFB input; supports closed-loop control with <1% drift over temperature. |
| PWM Dimming Frequency | 324 Hz (typ) with 33 nF CPWM capacitor - provides flicker-free dimming; duty cycle mapped linearly to PWMa analog input (0–3.3 V). |
| Fault Timeout Duration | Tfault(timeout) = 15 × Tfault(delay) - controlled by CT capacitor; delay per cycle ≈ 100 µs, enabling adjustable fault hold-off up to ~1.5 ms. |
| Non-overlap Time | 0.55 µs (typ) - prevents shoot-through in external half-bridge MOSFETs; implemented internally per driver pair. |
| Driver Sourcing Current | −145 mA (typ) - sufficient to drive standard 10 nC gate charge MOSFETs at 44–105 kHz; sink resistance Rdriver(sink) = 7.3 Ω ensures fast turn-off. |
Pinout & Package
UBA2072T/N1,518 is packaged in SO28 (SOT136-1), a plastic small outline package with 28 leads and 7.5 mm body width. Pin assignment follows standard top-view orientation with SGND (pin 7) as signal ground reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IFB (1) | Lamp current feedback input | Accepts AC-coupled or DC voltage proportional to lamp current; feeds OTA-based regulation loop with 40 kΩ input impedance at 1 V. |
| CIFB (2) | Current regulation capacitor | Connects to SGND; sets time constant for lamp current control loop; stores regulation level during PWM off-time. |
| VFB (3) | Voltage feedback input | Monitors transformer secondary voltage; triggers overvoltage protection when exceeding 5 V peak (t < 1 ms). |
| CVFB (4) | Voltage regulation capacitor | Clamped at 2.5 V to limit Fs(min); charging/discharging current (−21 µA typ) controls frequency modulation during OV events. |
| IREF (5) | Reference current output | Requires 33 kΩ resistor to SGND; generates precise internal bias currents for OTA and oscillators. |
| CT (6) | Fault timing capacitor | Determines fault timeout duration; capacitor value scales 15-cycle counter period (≈100 µs/cycle) before STOP-state entry. |
| SGND (7) | Signal ground | Analog reference for IFB, VFB, CIFB, CVFB, CT, CF, CSWP, CPWM, PWMa, nonFAULT, EN - must be separated from PGND. |
| CF (8) | HF oscillator timing capacitor | Sets minimum switching frequency Fs(min); 100 pF yields 44.8 kHz (typ); tolerance directly impacts lamp brightness stability. |
| CSWP (9) | Phase-shift sweep capacitor | Charged/discharged to sweep ∆φ from 0° to 180° during PWM dimming; voltage range 1–3 V maps linearly to phase shift. |
| CPWM (10) | PWM timing capacitor | Configures internal PWM frequency; 33 nF yields 324 Hz (typ); grounding disables internal generator, enabling external PWMd control. |
| nonFAULT (12) | Bidirectional fault status I/O | Pulled low by IC on any internal fault; accepts external current sink (<100 µA) to signal external faults (e.g., overtemp, short). |
| PWMa (13) | Analog PWM dimming input | 0–3.3 V input sets internal PWM duty cycle linearly; 0 V = lamps off, 3.3 V = 100% on; used only in master mode. |
| PWMd (14) | Digital PWM dimming I/O | Active-low output (master) or input (slave); low = lamps on; synchronized across multiple UBA2072T/N1,518 ICs via shared bus. |
| GHB (15), FSB (16), SHB (17) | High-side driver B chain | GHB drives gate of high-side MOSFET B; FSB supplies floating bias via bootstrap cap to SHB (source node of same MOSFET). |
| EN (19) | Chip enable input | Low voltage (<0.8 V) forces standby: stops oscillation, resets internal logic, retains VDD regulation at reduced current. |
| VDC (20) | IC supply input | Main power input (9–30 V); must exceed VDD by ≥1.5 V; supplies internal LDO and gate drivers via VDD. |
| VDD (21) | Regulated 12 V output | 12 V ±0.7 V output sourcing up to −36 mA; powers low-side drivers directly and high-side drivers via bootstrap caps. |
| GLB (22), PGND (23), GLA (24) | Low-side driver outputs & return | GLA/GLB drive gates of low-side MOSFETs A/B; PGND is dedicated power ground return for both low-side drivers. |
| SHA (26), FSA (27), GHA (28) | High-side driver A chain | GHA drives gate of high-side MOSFET A; FSA supplies floating bias via bootstrap cap to SHA (source node of same MOSFET). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diodes | Eliminates 4 external diodes; enables self-biased high-side gate drive using FSA/FSB and SHA/SHB pins - reduces BOM count and layout area. |
| Asynchronous PWM dimming | Independent of ignition frequency sweep; preserves lamp current regulation level in CIFB capacitor during off-phase - ensures stable re-ignition at deep dim levels. |
| Four-fold fault protection | Dedicated circuits for overvoltage (VFB threshold), overcurrent (IFB threshold), arcing (IFB spike detection >100 ns), and ignition failure (IFB average <1.32 V after sweep) - each initiates same CT-based timeout sequence. |
| Resonant ignition sweep | Starts at Fs(max) ≈ 105 kHz and sweeps down to Fs(min) ≈ 44.8 kHz to match unloaded LC resonance - minimizes sensitivity to component tolerances and lamp aging. |
| Bidirectional nonFAULT signaling | IC pulls pin low on internal fault; external circuit sinks current to signal faults (e.g., thermal cutoff) - avoids bus contention via current-source vs. current-sink interface. |
Applications
| LCD-TV Backlight Inverter | Desktop Monitor CCFL Driver |
|---|---|
Use Scenario: Driving dual CCFL arrays in 32–42 inch LCD-TVs with dynamic brightness control and thermal derating. IC Role / Device Role / Timing Role: Full-bridge controller managing phase-shifted gate drive for 4 external MOSFETs; synchronizes PWM dimming across multiple UBA2072T/N1,518 ICs via daisy-chained PWMd pins. Use Value: Enables 1000:1 dimming ratio with no visible flicker; built-in arcing detection prevents catastrophic transformer failure during lamp end-of-life. | Use Scenario: Compact CCFL inverter for 19–24 inch desktop monitors requiring low EMI and high reliability over 50,000-hour lifetime. IC Role / Device Role / Timing Role: Primary timing and protection IC; uses CF = 100 pF for 44.8 kHz nominal operation and CT = 100 nF for 1.5 ms fault timeout - balances efficiency and safety margin. Use Value: Integrated level-shifters and bootstrap diodes reduce gate-drive component count by 8 parts per channel; non-overlap time of 0.55 µs prevents MOSFET shoot-through at full load. |
| EEFL Array Controller | Industrial Panel Display Backlight |
Use Scenario: Driving External Electrode Fluorescent Lamps (EEFLs) in medical imaging displays where uniform luminance and rapid startup are critical. IC Role / Device Role / Timing Role: Resonant inverter controller adapting CCFL topology to EEFL's higher capacitance load; leverages VFB loop for output voltage regulation during cold-start. Use Value: Ignition failure detection ensures lamps ignite within 500 ms; CVFB clamping at 2.5 V guarantees immediate frequency increase if output voltage exceeds safe limit. | Use Scenario: Harsh-environment backlight for factory HMIs operating from −25 °C to +70 °C ambient with wide-input 12–28 V DC supply. IC Role / Device Role / Timing Role: Robust CCFL controller surviving 100,000 thermal cycles; uses IREF resistor for stable biasing and SGND/PGND separation to reject ground noise in noisy industrial settings. Use Value: Junction temperature rating up to +125 °C and thermal resistance Rth(j-a) = 68 K/W (SO28) ensure reliable operation without forced air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCFL backlight control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UBA2071T/N1,518 | Single-channel variant; lacks PWMd I/O and CPWM timing capacitor input - supports only analog PWMa dimming. | Suitable for simpler, cost-sensitive CCFL designs without multi-IC synchronization or external PWM sources. | Select UBA2071T/N1,518 only if digital PWM control, master/slave dimming sync, or external PWM injection is not required. |
| IRS2153DSTRPBF | Half-bridge driver with integrated oscillator; no phase-shift control, lamp current regulation, or fault protection - requires external control logic. | Used in basic resonant inverters where microcontroller handles dimming and protection; not a drop-in replacement. | Choose IRS2153DSTRPBF only when full system-level control resides externally and CCFL-specific protections are implemented separately. |
Compared with UBA2072T/N1,518, the UBA2071T/N1,518 omits digital PWM capability and synchronization, limiting scalability, while the IRS2153DSTRPBF shifts protection and regulation burden to external circuitry - making UBA2072T/N1,518 the only solution integrating full CCFL-specific control, dimming, and fault management in a single SO28 package.
Availability
UBA2072T/N1,518 is available at Aetrix Electronics and suitable for LCD-TV backlight inverters, desktop monitor CCFL drivers, EEFL array controllers, and industrial panel display backlights requiring stable component supply and long-term production continuity.
Supply support for UBA2072T/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 UBA2072T/N1,518 belongs to NXP's backlight control IC product line, engineered specifically for energy-efficient, high-reliability CCFL and EEFL inverter systems in flat-panel displays - emphasizing integrated protection, resonant ignition, and flicker-free dimming.
FAQ
What is the recommended capacitor value for the CF pin on the UBA2072T/N1,518 to achieve nominal 44.8 kHz operation?
The UBA2072T/N1,518 achieves its typical minimum switching frequency of 44.8 kHz with a 100 pF capacitor connected between the CF pin and SGND. This value is specified in Table 5 of the datasheet under "Fs(min)" conditions. Deviations alter frequency linearly: ±10% capacitance change yields ±10% frequency shift. Always verify actual frequency with oscilloscope measurement at GLA/GLB outputs under load, as PCB stray capacitance affects final tuning.
How does the UBA2072T/N1,518 handle lamp ignition failure, and what design actions trigger it?
The UBA2072T/N1,518 detects ignition failure when the average double-side rectified voltage at the IFB pin remains below VIFB(lampon) = 1.32 V after the frequency sweep reaches Fs(min). Upon detection, it disables PWM dimming, activates the nonFAULT pin, and starts the CT-based fault timer. To prevent false triggers, ensure the current sense resistor value and IFB RC filter allow sufficient signal bandwidth to capture lamp conduction onset within the sweep window.
Can the UBA2072T/N1,518 drive both CCFL and EEFL loads, and what design adjustments are needed?
Yes, the UBA2072T/N1,518 explicitly supports External Electrode Fluorescent Lamps (EEFLs) per Section 3 of the datasheet. EEFLs present higher capacitance and lower ignition voltage than CCFLs, so adjust the VFB feedback network to lower the overvoltage threshold and increase CF value slightly (e.g., 120 pF) to reduce nominal frequency - ensuring resonance matching. No changes to CIFB, CSWP, or CT are required unless lamp count or transformer turns ratio differs significantly.
What is the purpose of separating SGND and PGND pins on the UBA2072T/N1,518, and how should they be routed?
SGND (pin 7) serves as the analog reference for all feedback, timing, and control pins (IFB, VFB, CT, CF, etc.), while PGND (pin 23) returns high-current low-side driver paths (GLA, GLB). Separating them prevents switching noise from corrupting sensitive regulation loops. Route SGND as a dedicated star-connected pour tied only to signal-side bypass capacitors (CIFB, CVFB, CT); connect PGND to main power ground plane with short, wide traces; join SGND and PGND at a single point near the VDD decoupling capacitor.
Does the UBA2072T/N1,518 support synchronization of PWM dimming across multiple ICs, and how is it implemented?
Yes, the UBA2072T/N1,518 supports synchronized PWM dimming via its PWMd pin. Configure one IC as master (CPWM capacitor installed) and others as slaves (CPWM grounded); tie all PWMd pins together. The master's active-low PWM signal propagates to slaves, ensuring identical on/off timing. Ensure total bus capacitance stays below 100 pF and use 10 kΩ pull-up resistors on each PWMd line to maintain logic integrity - verified in Figure 11 of the datasheet.
UBA2072T/N1,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- CCFL/EEFL Controller
- Frequency:
- 43kHz ~ 46.6kHz
- Voltage - Supply:
- 9V ~ 30V
- Current - Supply:
- 5 mA
- Current - Output Source/Sink:
- -
- Dimming:
- Yes
- Operating Temperature:
- -25°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SO
UBA2072T/N1,518 FAQ
1.How can I place an order for UBA2072T/N1,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for UBA2072T/N1,518 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 UBA2072T/N1,518 reliable?
The price and inventory of UBA2072T/N1,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UBA2072T/N1,518 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UBA2072T/N1,518 transactions.
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UBA2072T/N1,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UBA2072T/N1,518 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 UBA2072T/N1,518?
For technical support, including UBA2072T/N1,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UBA2072T/N1,518 requirements.
6.How does Aetrix verify that UBA2072T/N1,518 is sourced from the original manufacturer or authorized distributors?
All UBA2072T/N1,518 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 UBA2072T/N1,518 meets industry standards.
7.What is the process for return or replacement of UBA2072T/N1,518?
All UBA2072T/N1,518 units undergo pre-shipment inspection (PSI). If there is an issue with UBA2072T/N1,518, 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 UBA2072T/N1,518 part is unused and in its original packaging.
Return procedure for UBA2072T/N1,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UBA2072T/N1,518 Tags
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