UCC256403ADDBR Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments UCC256403ADDBR is an LLC resonant controller with ultra-low-power and ultra-quiet standby, operating from 11.25 V to 30 V supply in a 14-pin SOIC package. It uses current-mode resonant control and covers -40°C to 125°C for demanding industrial and server PSU applications. Available from stock worldwide with competitive pricing.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 14
- Lifecycle
- ACTIVE
- Datasheet
- UCC256403ADDBR Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.2700(MOQ 100)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Ultra-low standby power with ultra-quiet operation reduces EMI and meets Energy Star no-load requirements in AC-DC power supplies
- LLC resonant control technique enables zero-voltage switching (ZVS) for high efficiency at full load in server and industrial PSU designs
- -40°C to 125°C operating temperature range qualifies UCC256403ADDBR for harsh industrial and automotive auxiliary power applications
Applications
The UCC256403ADDBR is designed for high-efficiency AC-DC power supplies in server, telecom, and industrial equipment where LLC resonant topology minimizes switching losses and EMI. Its ultra-quiet standby mode meets stringent Energy Star and ErP Lot 6 no-load power limits below 300 mW, making it suitable for desktop adapters and off-line ATX power supplies with eco-mode requirements. The wide 11.25 V to 30 V bias supply range also accommodates auxiliary winding supplies from a wide variety of transformer designs.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | RESONANT CONTROL |
| Input Voltage-Max | 30V |
| Input Voltage-Min | 11.25V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-PDSO-G14 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1.2A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP14/16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Supply Current-Max (Isup) | 2.7mA |
| Supply Voltage-Max (Vsup) | 30V |
| Supply Voltage-Min (Vsup) | 11.25V |
| Surface Mount | YES |
| Switching Frequency-Max | 99.7kHz |
| Technology | BICMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What efficiency advantage does the LLC resonant control technique in UCC256403ADDBR provide over traditional PWM controllers?
The LLC resonant control in UCC256403ADDBR achieves zero-voltage switching (ZVS) on the primary-side MOSFETs across a wide load range, eliminating capacitive switching losses that dominate in hard-switched PWM topologies above 100 kHz. In typical 400 W server PSU designs, this can push full-load efficiency above 94%, compared to 88–91% achievable with conventional PWM control at the same switching frequency.
How does the ultra-quiet standby feature of UCC256403ADDBR help a design meet ErP Lot 6 no-load power requirements?
The UCC256403ADDBR's ultra-quiet standby mode dramatically reduces the controller's own quiescent current and burst-mode switching frequency during no-load and light-load conditions. This allows a well-designed 300 W AC-DC power supply to achieve no-load input power below 100 mW, comfortably meeting the ErP Lot 6 limit of 300 mW and Energy Star Level VI requirements, without sacrificing transient response when full load is applied.
What bias supply voltage range does UCC256403ADDBR require, and how does this affect transformer auxiliary winding design?
The UCC256403ADDBR operates from a VCC bias supply between 11.25 V and 30 V, with a nominal of 15 V. Transformer designers can wind an auxiliary bias winding targeting 15 V regulated output across a ±30% input range, giving significant margin without needing a dedicated secondary regulator. This 11.25 V lower limit also ensures the IC stays operational during input voltage brownout conditions common in industrial environments.
For an industrial power supply needing -40°C cold-start capability, is UCC256403ADDBR a suitable controller choice?
Yes. The UCC256403ADDBR is specified over the full -40°C to 125°C industrial temperature range, verifying all key parameters — oscillator frequency accuracy, gate drive current, and protection thresholds — across both cold-start and elevated ambient conditions. Cold-start at -40°C is particularly important for outdoor industrial equipment such as outdoor base station power supplies and substation UPS systems where the controller must initiate LLC resonant switching with predictable behavior from power-up.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 100+ | $1.6639 | $166.39 |
| 250+ | $1.5729 | $393.22 |
| 500+ | $1.5376 | $768.82 |
| 1000+ | $1.3700 | $1370.00 |
| 2500+ | $1.2900 | $3225.00 |
| 5000+ | $1.2700 | $6350.00 |
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