My Inquiry
My Account
Texas Instruments UCC25710DW
- Part No.:
- UCC25710DW
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC25710DW.pdf
- Description:
- IC LED DRIVER OFFL PWM 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,525
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UCC25710DW from Texas Instruments is a dedicated LLC half-bridge controller for multi-string LED lighting systems, providing closed-loop current regulation across N LED strings, PWM dimming control with programmable slew rates, and integrated gate drivers delivering ±400 mA/–800 mA peak current. It operates from 11 V to 18 V VCC, supports 25 kHz to 350 kHz switching frequency range, and targets high-efficiency LCD TV backlight and general LED lighting applications.
For engineers reviewing the UCC25710DW datasheet, UCC25710DW pinout, UCC25710DW application, or UCC25710DW equivalent, this page delivers verified technical context on its VCO-based LLC modulation, dual-threshold protection architecture (OV/UV/CL), dimming ramp control via DSR/DADJ/DTY pins, and SOIC-20 package implementation - all critical for backlight power stage design and EMI-sensitive dimming validation.
Technical Context
The UCC25710DW implements a voltage-controlled oscillator (VCO) with independently programmable FMIN (±3% accuracy) and FMAX (±7.5% accuracy) using external resistors, enabling precise LLC resonant frequency sweep from 29.5 kHz to 320 kHz. Its GM current amplifier drives ICOMP to regulate LED string current via CS feedback while maintaining closed-loop control even at 1% dimming duty cycle.
Dimming is executed through coordinated action: DIM input gates both the LEDSW output (for external series FET control) and the LLC gate drivers (GD1/GD2), with programmable ON/OFF ramping via DSR capacitor to suppress audible noise. Protection includes latch-off overcurrent (CL ≥ 1.9 V), auto-restart OV/UV (2.6 V / 2.4 V thresholds), and thermal shutdown at 135°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 11 V to 18 V - powers gate drivers and internal blocks; UVLO turn-on at 9.3 V ensures stable startup after PFC output stabilization |
| Switching Frequency | 25 kHz to 350 kHz - FMIN = 30.5 kHz (RFMIN = 100 kΩ), FMAX = 300 kHz (RFMAX = 4.99 kΩ); enables high-efficiency operation across full dimming range |
| Gate Drive Capability | ±400 mA source / –800 mA sink - drives primary-side gate transformers directly; 500 ns fixed dead time prevents shoot-through in half-bridge topology |
| LED Current Regulation | ±1% matching across strings - achieved via closed-loop ICOMP control of VCO frequency and precision 5-V VREF reference (±1.5% over –40°C to 125°C) |
| Protection Thresholds | OV = 2.6 V, UV = 2.4 V, CL = 0.95 V (restart) / 1.9 V (latch-off) - externally resistor-divided inputs enable scalable fault detection for varied LED string configurations |
| Dimming Linearity | <2% error from 1% to 100% duty cycle - enabled by DTY/DADJ sawtooth compensation and ICOMP pedestal maintenance during PWM OFF-time |
| Thermal Performance | RθJA = 79°C/W - SOIC-20 package supports industrial ambient (–40°C to 125°C) without forced airflow in typical 45-W dual-string designs |
Pinout & Package
UCC25710DW is housed in a lead-free 20-pin SOIC package (12.80 mm × 7.50 mm body size) with standard JEDEC MS-013AC footprint and 1.27-mm pitch. Thermal resistance RθJA = 79°C/W enables convection-cooled operation in space-constrained backlight modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply input | Bypassed with ≥0.47 µF ceramic capacitor; powers gate drivers and internal bias rails; UVLO disables operation below 9.3 V |
| GD1/GD2 (Pins 2,3) | Half-bridge gate drive outputs | 180° out-of-phase, 500 ns dead time; ±400 mA/–800 mA drive capability; GD2 initiates startup sequence |
| GND (Pin 4) | Analog/digital ground reference | Common return for gate drive low-side paths and analog signal references; requires star grounding near pin to minimize noise coupling |
| VREF (Pin 5) | 5-V precision reference output | Stable 5 V ±1.5% over temperature; supplies CREF divider and external circuitry; max 10-mA load capacity |
| LEDSW (Pin 6) | LED series switch control output | Open-drain logic-level signal synchronized to DIM input; drives external MOSFET gate via simple level-shifting circuit |
| DTY/DADJ/DSR (Pins 7,8,14) | Dimming timing control interface | DTY averages DIM duty cycle; DADJ generates sawtooth for ON-time extension; DSR sets VCO slew rate to eliminate audible noise |
| DIM/BLON (Pins 9,10) | Functional enable and dimming inputs | DIM accepts 300-Hz PWM (1.2–1.8 V threshold); BLON enables VREF and internal blocks (1.2 V threshold, 200-kΩ pulldown) |
| OV/UV/CL (Pins 11,12,13) | Fault monitoring inputs | Resistor-divider interfaces for LED string overvoltage (2.6 V), undervoltage (2.4 V), and input overcurrent (0.95 V restart / 1.9 V latch) |
| CREF/CS/ICOMP (Pins 15,16,17) | Current regulation loop interface | CREF sets LED current reference (0.6–2.7 V); CS senses sense-resistor voltage; ICOMP is transconductance amplifier output driving VCO |
| SS/FMIN/FMAX (Pins 18,19,20) | Startup and frequency programming | SS controls soft-start ramp (4.2 V threshold); FMIN/FMAX resistors set VCO frequency boundaries with ±3%/±7.5% accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Closed-loop LED current control | Maintains ±1% current matching across multiple strings using ICOMP-regulated VCO frequency, enabling uniform brightness in multi-transformer architectures |
| Programmable dimming ramp control | DSR capacitor sets symmetric VCO frequency slew rate; DADJ/DTY circuitry extends LLC ON-time beyond LED switch ON-time to preserve regulation at low dimming duty cycles |
| Integrated dual-threshold protection | CL pin provides restart (0.95 V) and latch-off (1.9 V) responses; OV/UV pins use accurate internal comparators (2.6 V / 2.4 V) with 240-mV hysteresis for robust fault recovery |
| High-accuracy 5-V reference | VREF output holds 4.95–5.05 V (0–10 mA load, 25°C) and 4.85–5.15 V (–40°C to 125°C), enabling precise CREF divider setting for tight LED current tolerance |
| Low-power startup and operation | Soft-start current ISS = 2.5 µA; operating supply current ION = 2.1 mA at FMIN; disabled current IDISABLE = 350 µA - reduces standby losses in always-on display systems |
Applications
| LCD TV Backlight | Commercial Display Lighting |
|---|---|
|
Use Scenario: Driving 4–8 parallel LED strings in edge-lit or direct-lit LCD panels with dynamic local dimming. IC Role / Device Role / Timing Role: LLC half-bridge controller modulating resonant tank frequency to regulate total LED current while synchronizing LEDSW with DIM for per-zone brightness control. Use Value: Achieves >94% system efficiency and <2% dimming linearity from 1% to 100%, eliminating visible banding in high-contrast video content. |
Use Scenario: Powering multi-string LED arrays in digital signage, kiosks, and retail displays requiring flicker-free 300-Hz PWM dimming. IC Role / Device Role / Timing Role: Provides coordinated gate drive (GD1/GD2) and LED switch (LEDSW) timing with programmable DSR slew to suppress acoustic noise during brightness transitions. Use Value: Enables silent dimming operation and ±1% inter-string current matching across 20+ strings, ensuring uniform luminance in large-format installations. |
| Industrial Control Panel Lighting | Medical Imaging Backlight |
|
Use Scenario: Illuminating membrane keypads and status indicators in factory HMIs where EMI and thermal constraints limit heatsink use. IC Role / Device Role / Timing Role: Delivers regulated current via CS feedback while leveraging SOIC-20's 79°C/W RθJA for convection-only cooling in sealed enclosures. Use Value: Maintains stable light output over –40°C to 85°C ambient without derating, supported by thermal shutdown at 135°C and auto-restart fault recovery. |
Use Scenario: Backlighting high-resolution diagnostic monitors requiring precise grayscale fidelity and zero flicker at all brightness levels. IC Role / Device Role / Timing Role: Uses closed-loop ICOMP control to sustain regulation down to 1% dimming duty cycle, preventing current droop that causes gamma curve distortion. Use Value: Guarantees <1% LED current variation across strings and <2% linearity error, preserving clinical image contrast and diagnostic accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LLC-based multi-string LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC25711DW | Pin-compatible variant with enhanced EMI reduction features and tighter FMIN/FMAX accuracy (±2%/±5%); identical SOIC-20 package and pinout | Preferred for new designs targeting CISPR-25 Class 5 compliance in automotive displays; same PCB layout but improved noise immunity | Select UCC25711DW when EMI certification is mandatory and layout reuse is required; no schematic changes needed |
| NCP1397ADR2G | Fixed-frequency LLC controller without integrated dimming logic or LEDSW output; requires external PWM-to-analog conversion and separate LED switch driver | Suitable for cost-sensitive general lighting where analog dimming suffices; lacks native 300-Hz PWM synchronization and slew control | Choose NCP1397ADR2G only if dimming functionality is implemented externally and BOM cost reduction outweighs design complexity |
Compared with UCC25710DW, UCC25711DW offers superior EMI performance with identical layout compatibility, while NCP1397ADR2G reduces component count but sacrifices integrated dimming control - making UCC25710DW optimal for high-fidelity, noise-sensitive backlight systems requiring seamless PWM coordination.
Availability
UCC25710DW is available at Aetrix Electronics and suitable for LCD TV backlight, commercial display lighting, and industrial HMI applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for UCC25710DW 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 and embedded processing technologies, with decades of expertise in power management ICs for lighting, industrial, and automotive markets.
The UCC25710DW belongs to TI's LED backlight controller product line, engineered specifically for high-efficiency, multi-string LLC resonant converters in premium display systems - emphasizing precise current matching, flicker-free dimming, and robust fault protection.
FAQ
What is the recommended VCC bypass capacitor for UCC25710DW?
The UCC25710DW requires a minimum 0.47-µF ceramic capacitor placed directly between VCC (Pin 1) and GND (Pin 4) using short PCB traces. This capacitor stabilizes the internal bias rails and gate drivers during high di/dt switching events. TI specifies 0.47 µF as the absolute minimum; designs operating near 18 V VCC or with high ambient temperature may benefit from 1-µF for improved transient response and reduced ripple.
How does UCC25710DW achieve closed-loop current control at 1% dimming duty cycle?
The UCC25710DW maintains closed-loop LED current regulation at 1% dimming duty cycle by extending the LLC converter ON-time beyond the LEDSW active period using the DADJ/DTY circuitry. During PWM OFF-time, the ICOMP node is tri-stated while its compensation network holds the VCO control voltage, allowing continuous current regulation without droop. This preserves ±1% string matching even at minimal light output.
What protection features does UCC25710DW provide for LED string faults?
The UCC25710DW provides three dedicated LED string protection features: OV pin detects overvoltage (trip at 2.6 V) and triggers auto-restart after 10-ms reset; UV pin detects undervoltage (trip at 2.4 V) with identical recovery; and CL pin offers dual-threshold response - 0.95 V initiates restart, while 1.9 V forces latch-off. All thresholds are internally precise and resistor-divider scalable for different string counts and forward voltages.
Can UCC25710DW drive gate transformers directly without external buffers?
Yes, UCC25710DW can drive gate drive transformers directly via GD1 and GD2 outputs. Each output delivers ±400 mA source and –800 mA sink current into capacitive loads up to 4.7 nF, with 25-ns rise/fall times. The 500-ns fixed dead time prevents shoot-through, and the SOIC-20 package's thermal performance (RθJA = 79°C/W) supports this drive capability without external buffers in typical 45-W dual-string implementations.
What is the function of the DSR pin on UCC25710DW?
The DSR (Dimming Slew Rate) pin on UCC25710DW controls the rate of change of the VCO frequency during LLC ON/OFF transitions triggered by the DIM input. A capacitor from DSR to GND programs symmetric positive/negative slew rates, suppressing audible noise from magnetostrictive effects in transformers and inductors. Pulling DSR below 0.8 V disables GD1/GD2 outputs, providing an additional fault-handling path.
UCC25710DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- -
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 11V
- Voltage - Supply (Max):
- 18V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
UCC25710DW FAQ
1.How can I place an order for UCC25710DW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC25710DW 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 UCC25710DW reliable?
The price and inventory of UCC25710DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC25710DW is usually 5 days.
3.What payment methods are accepted for UCC25710DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC25710DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC25710DW?
UCC25710DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC25710DW 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 UCC25710DW?
For technical support, including UCC25710DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC25710DW requirements.
6.How does Aetrix verify that UCC25710DW is sourced from the original manufacturer or authorized distributors?
All UCC25710DW 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 UCC25710DW meets industry standards.
7.What is the process for return or replacement of UCC25710DW?
All UCC25710DW units undergo pre-shipment inspection (PSI). If there is an issue with UCC25710DW, 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 UCC25710DW part is unused and in its original packaging.
Return procedure for UCC25710DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCC25710DW Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
