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Texas Instruments UCC2818DWTR
- Part No.:
- UCC2818DWTR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC2818DWTR.pdf
- Description:
- IC PFC CTR AVERAGE 220KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,797
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Product details
Overview
UCC2818DWTR from Texas Instruments is a BiCMOS active power factor correction (PFC) controller for boost preregulators, implementing average current-mode control to achieve near-unity power factor and low line-current distortion. It features 7.5-V reference output, 10.5 V/10 V UVLO thresholds, 0.33 V zero-power detection, and integrated gate driver with 93–99% duty cycle range - deployed in sub-300 W IEC 61000-3-2-compliant PC and industrial power supplies.
For engineers reviewing the UCC2818DWTR datasheet, UCC2818DWTR pinout, UCC2818DWTR application, or UCC2818DWTR equivalent, key selection considerations include its 16-pin SOIC (DW) package, −40°C to +85°C operating temperature, 6–220 kHz programmable oscillator, peak current limit via PKLMT pin, and OVP/EN window comparator functionality for output overvoltage protection and enable control.
Technical Context
The UCC2818DWTR integrates a voltage error amplifier, current amplifier, analog multiplier, leading-edge PWM latch, and totem-pole gate driver in a single BiCMOS IC. Its average current-mode architecture uses CAI/MOUT differential sensing and CAOUT feedback to regulate input current waveform shape against rectified AC line voltage (via IAC and VFF), enabling stable, low-distortion sinusoidal line draw.
It implements feed-forward line regulation through VFF (mirrored half-IAC signal), zero-power detection at VAOUT < 0.33 V, and UVLO with asymmetric thresholds (10.5 V turn-on / 9.7 V turn-off) optimized for universal-input operation. The internal 7.5-V reference powers external circuitry and enables precise biasing of PKLMT and OVP/EN comparators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 10.5 V turn-on / 9.7 V turn-off - enables reliable startup across universal AC inputs (85–265 VAC) without false triggering |
| Reference Voltage | 7.5 V ±12 mV (−40°C to +85°C) - provides stable bias for PKLMT scaling, OVP threshold, and external circuitry |
| Oscillator Frequency Range | 6 kHz to 220 kHz (programmable via RT/CT) - supports optimized EMI filtering and magnetics sizing for 300 W-class PFC stages |
| Gate Driver Output | DRVOUT with 5–12 Ω pull-up / 2–10 Ω pull-down - delivers >900 mA source / >1.2 A sink for fast MOSFET switching with controlled edge rates |
| Zero-Power Detection | 0.33 V threshold on VAOUT - latches off gate drive during no-load or standby to meet IEC 62301 standby power requirements |
| Current Amplifier Offset | ±2.5 mV max - ensures accurate peak current limiting and low-distortion current sensing down to light loads |
| Operating Temperature | −40°C to +85°C - qualified for industrial and extended-environment power supply designs |
Pinout & Package
UCC2818DWTR is housed in a 16-pin SOIC package (DW suffix), 7.5 mm × 10.3 mm body size, with standard 1.27 mm pitch and gull-wing leads. Thermal resistance RθJA = 74.1°C/W on 5-inch2 FR4 board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference ground | Common return for VCC, VREF, and all analog blocks; requires direct 0.1 µF ceramic bypass to minimize noise coupling |
| PKLMT (Pin 2) | Peak current limit sense input | Accepts level-shifted voltage from current-sense resistor negative terminal; triggers shutdown when falling below 0 V |
| CAOUT (Pin 3) | Current amplifier output | Drives PWM comparator; compensation network placed between CAOUT and MOUT to stabilize current loop |
| CAI (Pin 4) | Current amplifier non-inverting input | Connected to GND-side of current-sense resistor; operates down to −0.5 V for bidirectional sensing capability |
| MOUT (Pin 5) | Multiplier output / current amp inverting input | High-impedance node combining multiplier current and CAI feedback; enables differential current sensing and leading-edge modulation |
| IAC (Pin 6) | Line voltage proportional current input | Receives scaled current from bridge rectifier output; max 500 µA ensures low distortion multiplier operation |
| VAOUT (Pin 7) | Voltage error amplifier output | Regulates bulk capacitor voltage; internally clamped to ~5.5 V to prevent overshoot during transients |
| VFF (Pin 8) | Feed-forward RMS voltage signal | Generated by mirroring half-IAC into RC filter; 1.4 V at low line improves line regulation accuracy |
| VREF (Pin 9) | 7.5 V precision reference output | Supplies 20 mA max; disabled below UVLO; used for PKLMT scaling, OVP reference, and external biasing |
| OVP/EN (Pin 10) | Overvoltage protection / enable input | Window comparator: disables DRVOUT above VREF+0.5 V or resets SS below 1.9 V (typ) |
| VSENSE (Pin 11) | Voltage amplifier inverting input | Connected to output divider network; sets regulated DC bus voltage (e.g., 385 V for universal input) |
| RT (Pin 12) | Oscillator timing resistor connection | Programs charging current; 10–100 kΩ range sets nominal frequency per f ≈ 0.6/(RT × CT) |
| SS (Pin 13) | Soft-start capacitor connection | Charged by 6–16 µA current source; ramps VAOUT-equivalent voltage to limit inrush during startup |
| CT (Pin 14) | Oscillator timing capacitor connection | With RT, sets PWM frequency; short direct trace to GND required for jitter-free operation |
| VCC (Pin 15) | Positive supply input | 10–17 V operation; ≥20 mA supply capability; bypassed directly to GND for gate-drive current spikes |
| DRVOUT (Pin 16) | Boost switch gate driver output | Totem-pole MOSFET driver; requires series gate resistor (≥11 Ω typical) to damp ringing on capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables stable, low-distortion sinusoidal input current draw without slope compensation - critical for IEC 61000-3-2 Class D compliance |
| Leading-edge PWM modulation | Synchronizes with downstream DC-DC converter to reduce bulk capacitor ripple current, extending capacitor lifetime in high-reliability supplies |
| Integrated 7.5 V reference | ±12 mV accuracy over temperature powers external circuitry and enables precise PKLMT scaling and OVP threshold setting |
| Asymmetric UVLO (10.5 V / 9.7 V) | Provides 0.8 V hysteresis to prevent oscillation during brownout conditions on universal AC inputs |
| Zero-power detection (0.33 V) | Latches off DRVOUT when VAOUT falls below threshold - reduces no-load consumption to meet Energy Star and EU CoC Tier 2 requirements |
| BiCMOS process technology | Delivers 150 µA typical start-up current and low quiescent power - improves efficiency in standby and light-load operation |
Applications
| PC Power Supply | Industrial AC-DC Module |
|---|---|
Use Scenario: 250 W ATX power supply with universal AC input (85–265 VAC) and IEC 61000-3-2 Class D compliance requirement. IC Role / Device Role / Timing Role: UCC2818DWTR controls boost PFC stage to shape input current waveform, regulates 385 V DC bus, and provides OVP/UVLO protection. Use Value: Achieves <0.99 power factor and <10% THD at full load while supporting −40°C cold-start and 85°C ambient operation. |
Use Scenario: DIN-rail mounted 240 W industrial AC-DC converter for PLC I/O modules requiring high reliability and wide temperature range. IC Role / Device Role / Timing Role: UCC2818DWTR serves as primary PFC controller in continuous conduction mode (CCM), managing line current harmonics and bulk voltage regulation. Use Value: Enables 93% peak efficiency and meets EN 61000-3-2 Group 1 limits with minimal external components due to integrated reference and gate driver. |
| LED Driver Front-End | Consumer Audio Power Supply |
Use Scenario: 150 W constant-current LED driver for commercial lighting with dimming interface and surge immunity. IC Role / Device Role / Timing Role: UCC2818DWTR implements active PFC before LLC resonant stage, using VFF feed-forward to maintain regulation during phase-cut dimmer transitions. Use Value: Maintains >0.95 PF across 10–100% dimming range and suppresses 3rd/5th harmonic currents to pass EN 61000-3-2 Annex C. |
Use Scenario: High-fidelity AV receiver power supply with dual-rail ±15 V analog section and 48 V digital rail, requiring low-noise, low-THD input stage. IC Role / Device Role / Timing Role: UCC2818DWTR controls interleaved boost PFC to minimize audible noise and EMI coupling into sensitive analog circuits. Use Value: Reduces 100 Hz ripple on bulk capacitor by 40% vs. voltage-mode control, lowering downstream filter requirements and transformer hum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power factor correction controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2817DWTR | Higher UVLO (16 V/9.7 V), same pinout and function but rated for 0°C to +70°C only | Suitable for cost-sensitive consumer applications without extended temperature needs | Select UCC2817DWTR only if ambient temperature stays within 0–70°C and higher UVLO margin is beneficial |
| FAN7930C | Fixed-frequency CCM controller with 12.5 V/8.5 V UVLO, no integrated VREF, lower gate drive strength (0.5 A sink) | Targeted at lower-cost, lower-power (<150 W) applications with relaxed THD and temperature specs | Choose FAN7930C where BOM cost reduction outweighs need for zero-power detection and 7.5 V reference integration |
Compared with UCC2818DWTR, UCC2817DWTR offers identical functionality but narrower temperature range and higher UVLO, while FAN7930C trades integrated features and performance for lower unit cost and simpler layout - making UCC2818DWTR optimal for industrial-grade, wide-temp, IEC-compliant designs.
Availability
UCC2818DWTR is available at Aetrix Electronics and suitable for PC power supplies, industrial AC-DC modules, and LED driver front-ends requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for UCC2818DWTR 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 decades of expertise in power conversion IC design and manufacturing.
The UCC2818DWTR belongs to TI's BiCMOS PFC controller product line, engineered specifically for high-efficiency, low-distortion active power factor correction in universal-input AC-DC power supplies up to 300 W.
FAQ
What is the operating temperature range of the UCC2818DWTR?
The UCC2818DWTR is specified for operation from −40°C to +85°C ambient temperature, making it suitable for industrial and extended-environment power supply designs where thermal robustness is critical. This extended range distinguishes it from the UCC2817DWTR (0°C to +70°C) and aligns with IEC 60950-1 and UL 62368-1 environmental requirements. All electrical characteristics in the datasheet are guaranteed across this full range.
How does the UCC2818DWTR implement zero-power detection?
The UCC2818DWTR monitors the voltage error amplifier output (VAOUT) and triggers zero-power mode when VAOUT falls below 0.33 V (typical), latching the DRVOUT gate driver low to halt switching. This feature reduces no-load input power consumption significantly - essential for meeting Energy Star 8.0 and EU CoC Tier 2 standby efficiency standards. The threshold is internally fixed and does not require external configuration.
What is the purpose of the VFF pin on the UCC2818DWTR?
The VFF pin on the UCC2818DWTR provides a feed-forward RMS voltage signal derived by mirroring half the IAC current into an external RC filter. At low AC line voltage (e.g., 90 VAC), VFF settles near 1.4 V, improving line regulation accuracy and reducing current distortion. This feed-forward path compensates for variations in input voltage amplitude, enabling consistent PFC performance across universal 85–265 VAC inputs without additional sensing circuitry.
Can the UCC2818DWTR be used in discontinuous conduction mode (DCM)?
Yes, the UCC2818DWTR supports both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) PFC topologies via its average current-mode control architecture. While optimized for CCM operation in higher-power applications (>150 W), it maintains stable regulation and low THD in DCM when configured with appropriate inductor value and compensation. The datasheet provides design guidelines for both modes in Section 8.
What is the recommended gate resistor value for the DRVOUT pin of the UCC2818DWTR?
Texas Instruments recommends a minimum series gate resistor of 11 Ω for the UCC2818DWTR's DRVOUT pin when VCC = 18 V and maximum sink current = 1.2 A, based on pulldown resistance (~4 Ω typical) and required damping. This value prevents excessive overshoot and ringing when driving typical MOSFET gate capacitances. The exact value should be fine-tuned empirically using oscilloscope measurements of gate voltage waveforms under worst-case load and temperature conditions.
UCC2818DWTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Mode:
- Average Current
- Frequency - Switching:
- 6kHz ~ 220kHz
- Current - Startup:
- 150 µA
- Voltage - Supply:
- 12V ~ 17V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UCC2818DWTR FAQ
1.How can I place an order for UCC2818DWTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2818DWTR 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 UCC2818DWTR reliable?
The price and inventory of UCC2818DWTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2818DWTR is usually 5 days.
3.What payment methods are accepted for UCC2818DWTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2818DWTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2818DWTR?
UCC2818DWTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2818DWTR 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 UCC2818DWTR?
For technical support, including UCC2818DWTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2818DWTR requirements.
6.How does Aetrix verify that UCC2818DWTR is sourced from the original manufacturer or authorized distributors?
All UCC2818DWTR 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 UCC2818DWTR meets industry standards.
7.What is the process for return or replacement of UCC2818DWTR?
All UCC2818DWTR units undergo pre-shipment inspection (PSI). If there is an issue with UCC2818DWTR, 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 UCC2818DWTR part is unused and in its original packaging.
Return procedure for UCC2818DWTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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