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Texas Instruments UCC2818DWTRG4
- Part No.:
- UCC2818DWTRG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC2818DWTRG4.pdf
- Description:
- IC PFC CTR AVERAGE 220KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,074
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Product details
Overview
UCC2818DWTRG4 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, 93–99% max duty cycle, and integrated gate driver with 0.2-A continuous sink/source capability - used in IEC61000-3-2-compliant sub-300-W AC/DC supplies.
For engineers reviewing the UCC2818DWTRG4 datasheet, UCC2818DWTRG4 pinout, UCC2818DWTRG4 application, or UCC2818DWTRG4 equivalent, key selection criteria include its 10.5 V turn-on UVLO, 7.5-V precision reference, soft-start charge current of –10 µA, peak current limit threshold at 0 V on PKLMT, and compatibility with 6–220 kHz oscillator frequency range via RT/CT programming.
Technical Context
The UCC2818DWTRG4 integrates an analog multiplier with three inputs (VAOUT, IAC, VFF) to generate a current-mode command signal (IMOUT), enabling accurate feed-forward line regulation and constant-power operation across universal input ranges. Its zero-power comparator monitors VAOUT and latches DRVOUT low below 0.33 V, supporting light-load efficiency optimization.
It employs leading-edge PWM modulation synchronized to the boost switch's zero-current crossing, reducing bulk capacitor ripple current. The current amplifier features ±2-mV offset and >90 dB CMRR, while the voltage error amplifier delivers 50–90 dB open-loop gain and 5.3–5.6 V high-level output for stable output voltage regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Turn-On Threshold | 10.5 V - enables operation only after stable VCC rail reaches minimum safe level for internal biasing |
| Voltage Reference Output | 7.5 V ±1.5% - powers external circuitry and serves as precision reference for sense networks |
| Oscillator Frequency Range | 6–220 kHz - set by RT/CT values; supports optimized EMI filtering and magnetics sizing |
| Max Duty Cycle | 99% - ensures sufficient conduction time for high-step-up boost operation at low-line conditions |
| Gate Driver Sink/Source | 0.2 A continuous / 1.2 A peak - directly drives medium-power MOSFET gates without external buffers |
| Soft-Start Charge Current | –10 µA - controls ramp rate of SS capacitor to limit inrush current during startup |
| Current Amp Offset Voltage | ±2 mV - minimizes line current distortion at light loads by preserving accuracy down to millivolt-level signals |
Pinout & Package
UCC2818DWTRG4 is housed in a 16-pin SOIC (DW) package measuring 7.5 mm × 10.3 mm, with standard JEDEC MS-013 footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Power and signal reference ground | Common return for all analog and power circuits; requires direct 0.1-µF ceramic bypass to VCC/VREF |
| PKLMT (2) | Peak current limit input | Threshold at 0 V; connects to current-sense resistor divider to trigger overcurrent shutdown |
| CAOUT (3) | Current amplifier output | Drives PWM latch via compensation network between CAOUT and MOUT; wide bandwidth for fast current loop response |
| CAI (4) | Current amp non-inverting input | Connects to GND-side of current sense resistor; operates down to and below GND for bidirectional sensing |
| MOUT (5) | Multiplier output / current amp inverting input | High-impedance node combining multiplier current and differential amplifier input; enables leading-edge modulation |
| IAC (6) | Line voltage proportional current input | Accepts up to 500 µA current representing rectified AC line; enables distortion-free feed-forward control |
| VAOUT (7) | Voltage error amplifier output | Limited to 5.5 V max; regulates boost output voltage via feedback divider connected to VSENSE |
| VFF (8) | Feed-forward RMS voltage | Generated from mirrored IAC; 1.4 V at low line, scales with VRMS2 to maintain constant power |
| VREF (9) | 7.5-V precision reference output | Supplies 20 mA; disabled below UVLO; used for biasing sense networks and external ICs |
| OVP/EN (10) | Overvoltage protection / enable input | Window comparator: disables DRVOUT if boost voltage exceeds VREF+0.5 V or pulls pin <1.9 V to reset SS |
| VSENSE (11) | Voltage error amplifier inverting input | Connected to output voltage divider; sets regulated output level (e.g., 385 V for universal input) |
| RT (12) | Oscillator timing resistor input | Charging current source; 10–100 kΩ resistor sets oscillator frequency with CT |
| SS (13) | Soft-start control | Charged by –10 µA current; voltage ramps to set initial error signal and prevent output overshoot |
| CT (14) | Oscillator timing capacitor input | Capacitor to GND sets frequency per f ≈ 0.6/(RT × CT); short trace required for stability |
| VCC (15) | Positive supply input | Operates from 10–17 V; must deliver ≥20 mA; inhibited below UVLO thresholds |
| DRVOUT (16) | Integrated MOSFET gate driver output | Totem-pole output with 5–12 Ω pullup/pulldown; drives boost switch gate with controlled rise/fall times |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Enables stable, low-distortion sinusoidal line current draw across universal AC input (85–265 VAC) |
| Leading-edge PWM modulation | Synchronizes switching to zero-current crossing, reducing bulk capacitor ripple current and extending lifetime |
| 7.5-V ±1.5% reference with 20-mA drive | Powers external circuitry and provides stable bias for precision current/voltage sensing networks |
| Zero-power detection at 0.33 V on VAOUT | Latches DRVOUT low under no-load conditions to eliminate standby power loss in PFC stage |
| Integrated 1.2-A peak gate driver | Directly drives MOSFET gates without external drivers, simplifying layout and reducing component count |
| Programmable 6–220 kHz oscillator | Allows EMI optimization and flexible magnetics design via simple RT/CT resistor-capacitor selection |
Applications
| PC Power Supplies | Consumer Electronics Adapters |
|---|---|
Use Scenario: 200–300 W ATX power supply meeting IEC61000-3-2 Class D limits. IC Role / Device Role / Timing Role: Controls boost preregulator to shape AC input current waveform matching voltage waveform. Use Value: Achieves >0.99 power factor and <10% THD at full load, enabling compliance without passive filters. | Use Scenario: Universal-input 90 W laptop adapter with active PFC front-end. IC Role / Device Role / Timing Role: Regulates boost output to 385 V DC while maintaining sinusoidal input current. Use Value: Enables compact design with single-stage PFC + LLC topology and reduced EMI filter size. |
| Industrial LED Drivers | IEC61000-3-2 Compliant Lighting |
Use Scenario: 150 W constant-current LED driver for street lighting with universal AC input. IC Role / Device Role / Timing Role: Provides regulated high-voltage DC bus for downstream buck-boost LED current regulation. Use Value: Ensures consistent lumen output across input voltage variations while meeting harmonic current limits. | Use Scenario: Commercial fluorescent replacement ballast with digital control and PFC. IC Role / Device Role / Timing Role: Implements average current mode control with feed-forward line regulation. Use Value: Delivers <5% current THD at 230 VAC, satisfying EN61000-3-2 Annex B requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28019DR | Fixed-frequency CCM controller; higher 16-V UVLO; no zero-power detection; 500-kHz max frequency | Better suited for high-power (>350 W), fixed-frequency designs requiring tighter regulation over wide load range | Select UCC28019DR when designing for >350 W with strict output voltage regulation and no need for light-load efficiency optimization |
| FAN4803SJX | CMOS-based; 12-V UVLO; lower 1.5-mA operating current; no integrated gate driver - requires external driver | Targeted at cost-sensitive, lower-power (<150 W) applications where board space allows discrete driver stage | Select FAN4803SJX when optimizing BOM cost in sub-150 W designs and external gate drive is acceptable |
Compared with UCC2818DWTRG4, UCC28019DR offers higher frequency capability and tighter regulation but lacks zero-power mode and integrated driver; FAN4803SJX reduces system cost but increases layout complexity and component count due to external driver requirement.
Availability
UCC2818DWTRG4 is available at Aetrix Electronics and suitable for PC power supplies, consumer electronics adapters, and industrial LED drivers requiring stable component supply with long-term lifecycle support.
Supply support for UCC2818DWTRG4 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs and industrial-grade controllers.
The UCC2818DWTRG4 belongs to TI's BiCMOS PFC controller product line, designed specifically for cost-effective, high-efficiency active power factor correction in sub-300-W universal-input AC/DC power supplies.
FAQ
What is the UVLO behavior of the UCC2818DWTRG4?
The UCC2818DWTRG4 features an asymmetric undervoltage lockout with 10.5 V turn-on and 9.7 V turn-off thresholds, providing 0.5 V hysteresis. This ensures reliable startup after input stabilization and prevents oscillatory operation near dropout. The UVLO circuit remains active during operation, disabling DRVOUT if VCC falls below 9.7 V - a critical safeguard during brownout conditions in the UCC2818DWTRG4.
How does the UCC2818DWTRG4 implement zero-power detection?
The UCC2818DWTRG4 monitors the voltage error amplifier output (VAOUT) and triggers zero-power mode when VAOUT drops below 0.33 V. This causes the internal latch to force DRVOUT low, halting switching and eliminating idle power consumption in the PFC stage. The threshold is factory-trimmed and temperature-stable, ensuring consistent no-load efficiency across the –40°C to +85°C operating range of the UCC2818DWTRG4.
Can the UCC2818DWTRG4 be used in discontinuous conduction mode (DCM)?
No - the UCC2818DWTRG4 is designed exclusively for continuous conduction mode (CCM) boost PFC operation. Its average current mode architecture, fixed-frequency oscillator, and internal compensation structure assume CCM operation. Attempting DCM operation results in unstable current loop behavior and loss of power factor correction. For DCM or transition-mode PFC, TI recommends the UCC28051 or UCC28070 instead of the UCC2818DWTRG4.
What is the maximum recommended gate resistance for the UCC2818DWTRG4 DRVOUT pin?
The UCC2818DWTRG4 DRVOUT pin requires an external series gate resistor to damp ringing and limit peak current. Based on typical pulldown resistance of 4 Ω and maximum sink current of 1.2 A, TI specifies a minimum gate resistance of 11 Ω for VCC = 18 V. Using less than this value risks excessive overshoot and potential MOSFET gate oxide stress. The exact value should be verified with layout parasitics and MOSFET Qg in the final UCC2818DWTRG4 design.
Does the UCC2818DWTRG4 support programmable overvoltage protection?
Yes - the UCC2818DWTRG4 implements OVP via the OVP/EN pin, which functions as a window comparator. The upper threshold is VREF + 0.50 V (≈8.0 V), with 500 mV hysteresis. By scaling the boost output voltage with a resistive divider into OVP/EN, designers can set custom OVP levels from ~30 V to >400 V. Pulling OVP/EN below 1.9 V also disables the controller and discharges SS, enabling use as an external enable signal in the UCC2818DWTRG4.
UCC2818DWTRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
UCC2818DWTRG4 FAQ
1.How can I place an order for UCC2818DWTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2818DWTRG4 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 UCC2818DWTRG4 reliable?
The price and inventory of UCC2818DWTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2818DWTRG4 is usually 5 days.
3.What payment methods are accepted for UCC2818DWTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2818DWTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2818DWTRG4?
UCC2818DWTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2818DWTRG4 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 UCC2818DWTRG4?
For technical support, including UCC2818DWTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2818DWTRG4 requirements.
6.How does Aetrix verify that UCC2818DWTRG4 is sourced from the original manufacturer or authorized distributors?
All UCC2818DWTRG4 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 UCC2818DWTRG4 meets industry standards.
7.What is the process for return or replacement of UCC2818DWTRG4?
All UCC2818DWTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC2818DWTRG4, 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 UCC2818DWTRG4 part is unused and in its original packaging.
Return procedure for UCC2818DWTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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