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Texas Instruments UCC256601DDBR
- Part No.:
- UCC256601DDBR
- Manufacturer:
- Texas Instruments
- Category:
- Power Supply Controllers, Monitors
- Package:
- 16-SOIC (0.154", 3.90mm Width), 14 Leads
- Datasheet:
-
UCC256601DDBR.pdf
- Description:
- WIDE-VIN/VOUT 750-KHZ LLC CONTRO
- Quantity:
- Payment:
- Shipping:
Inventory:1,767
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Product details
Overview
UCC256601DDBR from Texas Instruments is a 750kHz Input-Power Proportional Control (IPPC) LLC resonant controller in SOIC-14 package with removed pins for high-voltage clearance, featuring 50–750kHz switching frequency range, integrated ±0.6/–1.2A gate drivers, and 50ns cycle-by-cycle over-current protection. It enables wide VIN/VOUT operation in TV power supplies and medical AC/DC adapters.
For engineers reviewing the UCC256601DDBR datasheet, UCC256601DDBR pinout, UCC256601DDBR application, or UCC256601DDBR equivalent, key selection criteria include HV startup capability, X-capacitor discharge support, light-load burst mode thresholds, OVP latch behavior, and resonant current sensing via ISNS with internal VCR synthesizer.
Technical Context
The UCC256601DDBR implements IPPC control to linearize input power vs. control signal across wide input/output voltage ranges, enabling stable WLLC operation without PFC in non-universal-input designs. Its internal VCR synthesizer integrates resonant capacitor voltage to generate robust timing references independent of external oscillator drift.
It features adaptive soft start with reverse recovery avoidance, automatic capacitive region detection using ISNS polarity and ZCS comparators, and dual-mode burst control-high-frequency pulse skip for light-load efficiency and low-frequency burst for sub-300µA standby current. The HV pin serves dual purpose: high-voltage startup (7.5–13.8mA charge current) and AC zero-crossing detection (8–11V threshold) with programmable X-cap discharge timing (360ms active duration).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 50kHz to 750kHz full-load range - supports high-power-density LLC topologies with minimal magnetics size. |
| Gate Drive Capability | Integrated +0.6A / –1.2A source/sink - directly drives 10nF gate capacitance with <55ns rise/fall times at 1nF load. |
| OCP Response Time | 50ns cycle-by-cycle current limit - protects half-bridge FETs during short-circuit events before thermal damage occurs. |
| VCCP UVLO & Clamp | 7.5V rising UVLO with 0.3V hysteresis; internally clamped at 19V - ensures reliable operation across bulk input variations and prevents overvoltage stress. |
| FB Pin Current Source | 80µA typical (±12µA) with 100kΩ internal pull-down - sets optocoupler bias for precise secondary-side regulation in isolated converters. |
| X-Cap Discharge | 11.5mA typical discharge current (8.7–13.5mA) - meets IEC 62368-1 safety requirements for Class I equipment without external circuitry. |
| Thermal Shutdown | 135°C typical trip point with 20°C hysteresis - provides fail-safe protection while allowing sustained operation up to 125°C ambient. |
Pinout & Package
UCC256601DDBR uses a SOIC-14 package (9.9mm × 3.9mm body) with pins 2 and 13 physically removed to ensure ≥8mm creepage distance between HV and LV sections per IEC 60950-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HV | High-voltage input | Supplies startup current (7.5–13.8mA) from rectified AC line; later enables X-cap discharge and AC presence detection. |
| BLK | Bulk voltage sense | Monitors input bulk capacitor via resistor divider to enable feedforward control and UVLO/OVLO protection. |
| OVP/OTP | Protection input | Accepts NTC thermistor or Zener diode for external overtemperature or output overvoltage latching shutdown. |
| FB | Feedback input | Sinks 80µA current into optocoupler collector; internal 100kΩ pull-down enables stable regulation with standard TL431 circuits. |
| ISNS | Resonant current sense | Receives differentiated resonant capacitor voltage; used for OCP, ZCS detection, and VCR synthesis to avoid capacitive conduction. |
| TSET | Timing configuration | Programs minimum switching frequency, deadtime limits, and VCR integrator time constant; also outputs PFC on/off in UCC256604. |
| V5P | Regulated 5V supply | Provides 5.0V ±2.5% at up to 10.2mA - powers auxiliary circuits like optocoupler LED or microcontroller logic without external LDO. |
| GNDP | Primary-side ground | Reference node for all primary-side signals; must be connected to bulk capacitor negative terminal for accurate BLK sensing. |
| LO / HO | Gate drive outputs | Drive LLC half-bridge low-side and high-side MOSFET gates with 0.12V low-level and 0.35V high-side drop at 20mA load. |
| HS | High-side return | Connects to LLC switch node; enables level-shifted high-side drive via bootstrap capacitor between HB and HS. |
Key Features
| Feature | Design Value |
|---|---|
| Input-Power Proportional Control (IPPC) | Linearizes control signal vs. input power across 90–264VAC input and 5–24VDC output ranges - eliminates compensator redesign when changing input/output specs. |
| Enhanced Light-Load Management | Combines HF pulse skip (efficiency >85% at 10% load), LF burst mode (<300µA VCC sleep current), and audible-noise skipping - meets Energy Star 8.0 and CoC Tier 2 standby requirements. |
| Capacitive Region Avoidance | Detects ISNS polarity reversal and ZCS absence in real time; forces immediate deadtime extension to prevent hard-switching and FET avalanche failure. |
| Integrated HV Startup & X-Cap Discharge | Eliminates external HV resistor network and X-cap bleeder circuit - reduces BOM count by ≥4 components and improves reliability in high-humidity environments. |
| Adaptive Soft Start | Adjusts ramp rate based on input voltage and resonant tank conditions; limits inrush current to <1.5× steady-state peak and avoids diode reverse recovery stress. |
Applications
| TV Power Supply | Medical AC/DC Adapter |
|---|---|
|
Use Scenario: 120W isolated LLC converter powering 4K UHD TV main board with universal 90–264VAC input. IC Role / Device Role / Timing Role: Primary-side LLC controller implementing IPPC-based frequency modulation and resonant current sensing for ZVS across full load range. Use Value: Achieves >93% peak efficiency and <150mW no-load consumption while meeting IEC 62368-1 touch-current and X-cap discharge safety mandates. |
Use Scenario: 65W patient-connected medical adapter requiring reinforced isolation, low leakage current (<100µA), and 2×MOPP compliance. IC Role / Device Role / Timing Role: Safety-certified LLC controller managing burst-mode transitions and OVP latching to prevent hazardous output overvoltage under single-fault conditions. Use Value: Enables certified design with single-chip HV startup, X-cap discharge, and external OTP via NTC - eliminating need for discrete safety monitoring ICs. |
| Industrial DC Power Module | Notebook Gaming Adapter |
|
Use Scenario: 200W industrial DIN-rail power supply operating from 300–800VDC input in factory automation systems. IC Role / Device Role / Timing Role: Wide-VIN LLC controller using BLK feedforward and IPPC to maintain regulation stability despite 2.7:1 input variation and 40–85°C ambient range. Use Value: Delivers consistent transient response and <±1% output regulation without re-tuning compensation network across input extremes. |
Use Scenario: 140W GaN-based notebook/gaming adapter with 100–240VAC input and 20V/7A USB PD 3.1 output. IC Role / Device Role / Timing Role: High-frequency (750kHz) LLC controller synchronizing with GaN FETs via fast gate drivers and minimizing deadtime uncertainty. Use Value: Enables compact 45mm × 45mm × 25mm form factor with 1.2W/cm³ power density and <10mVpp output ripple at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LLC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC256604DDBR | Includes PFC on/off control signal and extended gain range; same HV startup and X-cap discharge. | Required when system-level PFC stage must be disabled during LF burst to meet <100mW standby targets. | Select UCC256604DDBR only if PFC coordination is needed; otherwise UCC256601DDBR reduces design complexity. |
| UCC256301DDBT | Lacks HV startup and X-cap discharge; max 500kHz switching; no OVP latch; 160µA FB current source. | Suitable for cost-sensitive, non-safety-critical applications where external HV bias and X-cap bleed are acceptable. | Choose UCC256301DDBT only for lower-cost, lower-performance designs without safety certification requirements. |
Compared with UCC256604DDBR and UCC256301DDBT, the UCC256601DDBR uniquely balances safety integration (HV startup + X-cap discharge), light-load optimization (HF/LF burst), and design simplicity - making it optimal for certified AC/DC power supplies targeting <300mW standby and >92% efficiency.
Availability
UCC256601DDBR is available at Aetrix Electronics and suitable for TV power supplies, medical AC/DC adapters, and industrial DC power modules requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical production.
Supply support for UCC256601DDBR 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 UCC25660x product line was designed specifically for high-efficiency, wide-input-range LLC resonant converters in consumer, medical, and industrial power supplies - emphasizing safety integration, light-load optimization, and design robustness.
FAQ
What is the maximum switching frequency supported by the UCC256601DDBR?
The UCC256601DDBR supports a full-load switching frequency range of 50kHz to 750kHz. This upper limit enables high-power-density LLC designs with reduced magnetic size and improved transient response, verified across temperature and line/load conditions per TI SLUSES3B datasheet Section 6.6.
Does the UCC256601DDBR include integrated high-voltage startup functionality?
Yes, the UCC256601DDBR integrates high-voltage startup circuitry on the HV pin, delivering 7.5–13.8mA charging current to VCCP during initial power-up from rectified AC line. This eliminates the need for external HV resistors and reduces no-load power loss in the startup network.
How does the UCC256601DDBR handle X-capacitor discharge for safety compliance?
The UCC256601DDBR provides integrated X-capacitor discharge via the HV pin, sourcing 11.5mA (typical) for 360ms after AC removal. This meets IEC 62368-1 Class I discharge requirements without external circuitry, ensuring <60V residual voltage within 1 second.
What protection features are built into the UCC256601DDBR?
The UCC256601DDBR includes 50ns cycle-by-cycle OCP, input/VCCP UVLO with 19V clamp, latched OVP on FB pin, external OVP/OTP via dedicated pin, and automatic capacitive region avoidance using ISNS polarity detection - all confirmed in Sections 4, 6.4, and 7.4 of the official datasheet.
Is the UCC256601DDBR pin-compatible with other members of the UCC25660x family?
No - the UCC256601DDBR shares the same SOIC-14 (DDB) package and pinout with UCC256602DDBR and UCC256604DDBR, but functional differences exist: UCC256601DDBR includes both HV startup and X-cap discharge, while UCC256602DDBR lacks X-cap discharge and UCC256604DDBR adds PFC on/off signaling on TSET.
UCC256601DDBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width), 14 Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Applications:
- LLC, Resonant Converter Controller
- Voltage - Input:
- 640V
- Voltage - Supply:
- 9V ~ 18.5V
- Current - Supply:
- 15 mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
UCC256601DDBR FAQ
1.How can I place an order for UCC256601DDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC256601DDBR 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 UCC256601DDBR reliable?
The price and inventory of UCC256601DDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC256601DDBR is usually 5 days.
3.What payment methods are accepted for UCC256601DDBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC256601DDBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC256601DDBR?
UCC256601DDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC256601DDBR 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 UCC256601DDBR?
For technical support, including UCC256601DDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC256601DDBR requirements.
6.How does Aetrix verify that UCC256601DDBR is sourced from the original manufacturer or authorized distributors?
All UCC256601DDBR 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 UCC256601DDBR meets industry standards.
7.What is the process for return or replacement of UCC256601DDBR?
All UCC256601DDBR units undergo pre-shipment inspection (PSI). If there is an issue with UCC256601DDBR, 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 UCC256601DDBR part is unused and in its original packaging.
Return procedure for UCC256601DDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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