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Texas Instruments UCC2976PW
- Part No.:
- UCC2976PW
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC2976PW.pdf
- Description:
- IC TRNSFRMR CNTLR 3-13.5V 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,393
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Product details
Overview
UCC2976PW from Texas Instruments is a half-bridge resonant piezoelectric transformer (PZT) controller IC for CCFL backlight power supplies, operating from 3 V to 13.5 V, featuring programmable voltage-controlled oscillator (VCO), dual MOSFET drivers (P-channel OUTP and N-channel OUTN), open lamp protection, and 15-µA shutdown current. It targets narrow-profile LCD enclosures in notebook computers and portable displays.
For engineers reviewing the UCC2976PW datasheet, UCC2976PW pinout, UCC2976PW application, or UCC2976PW equivalent, key selection criteria include its half-bridge topology support, 8-pin TSSOP package, 95–105 kHz nominal oscillator frequency (with ROSC = 24 kΩ, COSC = 470 pF), 50% duty cycle with anti-cross-conduction timing, and lamp current regulation via frequency sweep.
Technical Context
The UCC2976PW integrates a precision window comparator-based VCO, error amplifier with 1.5 V reference, and dual CMOS gate drivers optimized for out-of-phase P/N-MOSFET switching in resonant half-bridge topologies. Its startup sequence preconditioned COMP pin to 0 V enables maximum-frequency lamp striking, while open lamp detection uses 1.5 V threshold on OPEN/SD with 7-attempt retry logic.
Regulation is achieved by sweeping oscillator frequency from high to low until lamp current stabilizes; feedback is closed via FB pin referenced to 1.5 V, with COMP output controlling VCO frequency between 0.7 V and 1.7 V at OSC pin. The device includes UVLO (2.85 V turn-on, 200 mV hysteresis), dead-time generation (~250 ns), and no-lock detection when COMP exceeds 2.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 13.5 V - supports single-cell Li-ion and multi-cell alkaline inputs without external LDO |
| Oscillator Frequency | 95–105 kHz (typ.) with ROSC = 24 kΩ, COSC = 470 pF - sets resonant drive frequency for PZT primary-side LC tank |
| Driver Outputs | OUTP (P-channel driver), OUTN (N-channel driver) - complementary 50% duty cycle outputs with anti-cross-conduction timing |
| Open Lamp Threshold | 1.5 V on OPEN/SD pin - triggers lamp strike retry up to 7 times before error shutdown |
| Shutdown Current | 15 µA typical - enables ultra-low-power standby in battery-powered portable instruments |
| UVLO Threshold | 2.85 V (turn-on), 200 mV hysteresis - prevents erratic operation during brownout or cold-start conditions |
| Error Amplifier Reference | 1.500 V ±35 mV - precise internal reference for lamp current sensing via RCS/RFB network |
Pinout & Package
UCC2976PW is housed in an 8-pin TSSOP (PW) package with 0.65 mm pitch, optimized for compact CCFL inverter layouts. Pin functions are validated per TI SLUS497A datasheet Figure 6 (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OPEN/SD | Open lamp fault input / shutdown control | Dual-function pin: >1.5 V indicates lamp failure; >2.5 V forces 15-µA shutdown mode |
| 2: OSC | VCO timing node | Connects external ROSC/COSC to set center frequency and RANGE resistor to adjust sweep range |
| 3: COMP | Error amplifier output / VCO control voltage | Drives VCO frequency from 0 V (max freq) to 2.5 V (no-lock); slew rate set by external compensation |
| 4: FB | Inverting input of error amplifier | Compares lamp current sense voltage (via RCS/RFB) to 1.5 V reference for closed-loop regulation |
| 5: GND | Analog/digital ground reference | Common return for all internal circuitry; must be low-impedance star point for noise immunity |
| 6: OUTN | N-channel MOSFET gate driver output | Drives low-side N-MOSFET in half-bridge; slightly <50% duty cycle to prevent cross-conduction |
| 7: OUTP | P-channel MOSFET gate driver output | Drives high-side P-MOSFET in half-bridge; slightly <50% duty cycle for safe commutation |
| 8: VDD | Power supply input | Accepts 3–13.5 V; requires local 0.1 µF ceramic + 5–10 µF bulk capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Half-bridge topology optimization | Integrated anti-cross-conduction logic and matched OUTP/OUTN timing ensure safe P/N-MOSFET switching without external dead-time circuitry |
| Programmable VCO with wide sweep range | Frequency controlled by COMP voltage (0–2.5 V), enabling precise lamp strike-to-operate transition across PZT load variations |
| Open lamp protection with auto-retry | Hardware-based 7-attempt restart sequence eliminates need for microcontroller supervision in standalone inverters |
| Low-quiescent shutdown mode | 15-µA shutdown current extends battery life in portable instruments and notebook sleep states |
| UVLO with hysteresis | 2.85 V turn-on with 200 mV hysteresis prevents oscillation near supply dropout thresholds |
Applications
| Backlight Inverter for Notebook LCDs | Portable Medical Display Power |
|---|---|
Use Scenario: Driving cold cathode fluorescent lamps (CCFLs) in space-constrained 12–17-inch notebook displays using piezoelectric transformers. IC Role / Device Role / Timing Role: UCC2976PW acts as the resonant half-bridge controller, generating precisely timed gate drives to regulate lamp current via frequency sweep across PZT resonance. Use Value: Enables <10 mm profile backlight solutions by eliminating bulky magnetic transformers and supporting high-efficiency PZT operation at 95–105 kHz. | Use Scenario: Powering diagnostic-grade CCFL backlights in handheld ultrasound and patient monitor displays requiring stable luminance over wide temperature ranges. IC Role / Device Role / Timing Role: UCC2976PW serves as the lamp current regulator, using FB/COMP loop to maintain constant brightness despite battery voltage sag from 4.2 V to 3.0 V. Use Value: Delivers ±3% lamp current accuracy via 1.5 V internal reference and low-drift error amplifier, ensuring consistent image contrast in clinical environments. |
| Industrial Portable Instrument Backlight | Avionics Display Lighting Control |
Use Scenario: Illuminating ruggedized LCDs in field-deployable test equipment (e.g., multimeters, spectrum analyzers) operating from 3.3 V–12 V inputs. IC Role / Device Role / Timing Role: UCC2976PW functions as the core timing and protection controller, managing startup, open-lamp recovery, and thermal-safe shutdown in unattended operation. Use Value: Built-in 7-attempt open-lamp retry and error shutdown prevent latch-up during lamp aging or cold-temperature start, reducing field service calls. | Use Scenario: Providing EMI-optimized CCFL drive in certified cockpit displays where magnetic transformer emissions must be minimized. IC Role / Device Role / Timing Role: UCC2976PW operates as the resonant driver IC, using half-bridge topology and fixed 50% duty cycle to suppress even-order harmonics in critical avionics bands. Use Value: Achieves <10 dB lower conducted EMI versus flyback topologies due to balanced half-bridge current paths and absence of high-dV/dt transformer windings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCFL PZT controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC3976PW | Same pinout and function, but rated for 0°C to 70°C ambient (vs. UCC2976PW's –40°C to 85°C) | Targeted at commercial-grade portable electronics, not industrial or extended-temperature deployments | Select UCC3976PW only if operating environment stays within 0–70°C and cost sensitivity outweighs temperature margin |
| MAX8722A | Single-chip CCFL controller with integrated boost converter; no external MOSFET drivers; different topology support (flyback only) | Designed for simpler, lower-cost inverters without PZT or half-bridge requirements | Choose MAX8722A only when replacing magnetic-transformer-based designs and board space allows integrated boost stage |
Compared with UCC2976PW, UCC3976PW offers identical functionality at lower temperature grade and cost, while MAX8722A provides integrated power conversion but lacks PZT-optimized half-bridge timing and open-lamp retry logic essential for ceramic transformer reliability.
Availability
UCC2976PW is available at Aetrix Electronics and suitable for notebook computer backlight systems, portable medical display power supplies, and industrial handheld instrument lighting requiring stable component supply across extended temperature ranges.
Supply support for UCC2976PW 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in power conversion ICs.
The UCC2976PW belongs to TI's UCC397x family of piezoelectric transformer controllers, designed specifically to enable compact, efficient CCFL backlight solutions for portable electronics using resonant half-bridge topologies.
FAQ
What is the operating temperature range of the UCC2976PW?
The UCC2976PW is specified for operation from –40°C to +85°C ambient temperature. This extended industrial temperature range makes it suitable for deployment in portable instruments, automotive infotainment displays, and outdoor-rated handheld devices where thermal cycling is expected. The junction temperature limit remains at 125°C, consistent with TI's standard reliability qualification for this product family.
How does the UCC2976PW implement open lamp protection?
The UCC2976PW implements open lamp protection via the OPEN/SD pin, which monitors a peak-detect circuit tied to the CCFL. When voltage at this pin exceeds 1.5 V, the device interprets it as an open-lamp condition and initiates up to seven automatic restart attempts. If unsuccessful, UCC2976PW enters error shutdown mode until power is cycled or OPEN/SD is pulsed below 0.5 V after exceeding 2.5 V.
Can the UCC2976PW drive both N-channel and P-channel MOSFETs simultaneously?
Yes - the UCC2976PW integrates dedicated drivers for complementary half-bridge operation: OUTP drives a high-side P-channel MOSFET, while OUTN drives a low-side N-channel MOSFET. Both outputs operate at fixed 50% duty cycle with built-in anti-cross-conduction timing (~250 ns dead time), eliminating need for external gate-drive logic or discrete level-shifting circuits in the UCC2976PW design.
What oscillator components are required for nominal 100-kHz operation of the UCC2976PW?
For nominal 100-kHz oscillator frequency, the UCC2976PW requires ROSC = 24 kΩ and COSC = 470 pF connected to the OSC pin, per electrical characteristics table in SLUS499A. An additional RANGE resistor adjusts the frequency sweep range around this center point. Use NPO-type capacitors and 1% metal-film resistors for stable, temperature-invariant performance across the full operating range of the UCC2976PW.
Does the UCC2976PW support analog dimming control?
Yes - the UCC2976PW supports analog dimming through the FB pin. By injecting a variable voltage (e.g., 0–3 V) into the FB node via RCNT, lamp current - and thus brightness - is adjusted proportionally. The internal 1.5 V reference and error amplifier allow precise mapping of dimming voltage to lamp current, as demonstrated in application equations (12) and (13) of the UCC2976PW datasheet.
UCC2976PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Power Supplies
- Current - Supply:
- 1mA
- Voltage - Supply:
- 3V ~ 13.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
UCC2976PW FAQ
1.How can I place an order for UCC2976PW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2976PW 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 UCC2976PW reliable?
The price and inventory of UCC2976PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2976PW is usually 5 days.
3.What payment methods are accepted for UCC2976PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2976PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2976PW?
UCC2976PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2976PW 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 UCC2976PW?
For technical support, including UCC2976PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2976PW requirements.
6.How does Aetrix verify that UCC2976PW is sourced from the original manufacturer or authorized distributors?
All UCC2976PW 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 UCC2976PW meets industry standards.
7.What is the process for return or replacement of UCC2976PW?
All UCC2976PW units undergo pre-shipment inspection (PSI). If there is an issue with UCC2976PW, 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 UCC2976PW part is unused and in its original packaging.
Return procedure for UCC2976PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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