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Texas Instruments UCC2818DG4
- Part No.:
- UCC2818DG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC2818DG4.pdf
- Description:
- IC PFC CTR AVERAGE 220KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,436
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Product details
Overview
UCC2818DG4 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, leading-edge PWM modulation, and integrated gate driver with 0.2-A continuous sink capability - deployed in sub-300 W IEC61000-3-2-compliant AC/DC supplies.
For engineers reviewing the UCC2818DG4 datasheet, UCC2818DG4 pinout, UCC2818DG4 application, or UCC2818DG4 equivalent, this page delivers verified functional identity, confirmed SOIC-16 package mapping, validated 16-pin terminal roles, exact UVLO hysteresis (0.3–0.5 V), oscillator frequency range (6–220 kHz), and two confirmed alternative PFC controllers with documented technical and application differences.
Technical Context
The UCC2818DG4 integrates a high-accuracy 7.5-V reference, dual error amplifiers (voltage and current), analog multiplier with feed-forward (VFF) input, and a totem-pole gate driver delivering up to 1.2-A peak sink current. Its average current mode architecture uses CAI/MOUT differential sensing and CAOUT-driven PWM latch to enforce sinusoidal line current tracking.
UVLO operates at 10.5 V turn-on / 9.7 V turn-off with only 0.3–0.5 V hysteresis - distinct from UCC2817's 16 V/10 V UVLO - enabling reliable startup under brownout conditions. The zero-power comparator triggers at 0.33 V on VAOUT, latching DRVOUT low during no-load or fault conditions to minimize standby loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Threshold | 10.5 V turn-on / 9.7 V turn-off; enables stable operation across wide input voltage sags without false shutdown |
| Reference Voltage | 7.5 V ±1.5% over –40°C to +85°C; powers external circuitry and serves as precision bias for PKLMT and VSENSE networks |
| Oscillator Range | 6 kHz to 220 kHz via RT/CT; supports flexible switching frequency selection for EMI optimization and magnetics sizing |
| Gate Drive Capability | 0.2 A continuous / 1.2 A peak sink; directly drives MOSFET gates without external buffers in ≤300 W designs |
| Current Sense Input | CAI and MOUT support differential sensing down to GND; enables accurate current measurement with minimal offset (±2 mV) |
| Overvoltage Protection | OVP/EN window comparator with 1.9 V enable threshold and 300–600 mV hysteresis; disables DRVOUT and resets soft-start on overvoltage |
| Soft-Start Current | –6 to –16 µA SS charge current; controls ramp rate of duty cycle during startup to limit inrush current |
Pinout & Package
UCC2818DG4 is housed in a 16-pin SOIC (D) package measuring 3.91 mm × 9.9 mm, optimized for thermal performance (RθJA = 73.9°C/W) and PCB layout simplicity in compact AC/DC front-end designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Power and signal reference | Common return for VCC, VREF, and all analog inputs; requires direct 0.1-µF ceramic bypass to minimize noise coupling |
| PKLMT (2) | Peak current limit input | Accepts level-shifted current sense signal; triggers current limiting when voltage falls below 0 V |
| CAOUT (3) | Current amplifier output | Drives PWM latch with wide-bandwidth error signal; compensation network placed between CAOUT and MOUT |
| CAI (4) | Current amplifier noninverting input | Connects to ground side of current sense resistor; operates down to and below GND for full-cycle sensing |
| MOUT (5) | Multiplier output / current amp inverting input | High-impedance node combining multiplier current and CAI feedback; enables differential configuration and leading-edge modulation |
| IAC (6) | Line voltage proportional current input | Accepts up to 500 µA current representing instantaneous rectified AC line; primary feed-forward path for distortion reduction |
| VAOUT (7) | Voltage amplifier output | Regulates bulk capacitor voltage; clamped at ~5.5 V to prevent overshoot; feeds zero-power comparator at 0.33 V threshold |
| VFF (8) | Feed-forward RMS voltage | Generated by mirroring ½ IAC through external RC filter; sets 1.4 V at low line to scale power limit and improve line regulation |
| VREF (9) | 7.5-V precision reference output | Supplies 20 mA max; disabled below UVLO; used for biasing PKLMT divider and VSENSE scaling networks |
| OVP/EN (10) | Overvoltage/enable window comparator | Disables DRVOUT if boost output exceeds programmed threshold; pulls below 1.9 V to reset soft-start and halt operation |
| VSENSE (11) | Voltage amplifier inverting input | Connected to output voltage divider; sets regulated bulk voltage level (e.g., 385 V DC for universal input) |
| RT (12) | Oscillator timing resistor input | Programs charging current for CT; 10–100 kΩ recommended; nominal 3 V bias enables precise frequency setting |
| SS (13) | Soft-start control | Charges external capacitor with –10 µA typical current; used as voltage error signal during startup to ramp duty cycle gradually |
| CT (14) | Oscillator timing capacitor | Defines switching frequency per f ≈ 0.6/(RT × CT); requires short, direct GND connection to minimize jitter |
| VCC (15) | Supply voltage input | Operates from 10–17 V; requires ≥20 mA supply and local 0.1-µF ceramic bypass to sustain gate drive transients |
| DRVOUT (16) | Integrated gate driver output | Totem-pole MOSFET driver with 5–12 Ω pullup / 2–10 Ω pulldown; requires series gate resistor to damp ringing on capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Enables stable, low-distortion sinusoidal line current without slope compensation; reduces THD vs voltage-mode alternatives |
| Leading-edge PWM modulation | Synchronizes with downstream DC-DC stage to reduce bulk capacitor ripple current, extending capacitor lifetime in 300 W systems |
| 7.5-V ±1.5% reference | Powers external circuitry and provides precision bias for PKLMT and VSENSE; maintains accuracy across –40°C to +85°C |
| Low 150-µA start-up current | Reduces auxiliary supply burden during initial power-up; supports high-impedance VCC sourcing in energy-efficient designs |
| Integrated OVP/EN window comparator | Provides programmable overvoltage protection and system enable/disable control using single pin - simplifies fault management |
| Zero-power detection | Latches DRVOUT low when VAOUT falls below 0.33 V, eliminating standby power draw in no-load or light-load conditions |
Applications
| PC Power Supply | LED Driver Front-End |
|---|---|
|
Use Scenario: 200–300 W ATX-compatible power supply meeting IEC61000-3-2 Class D limits. IC Role / Device Role / Timing Role: Controls boost converter to shape AC input current waveform, maintaining >0.99 PF and <10% THD. Use Value: Enables compliance with global harmonic standards without external analog compensation or digital controller overhead. |
Use Scenario: Constant-voltage LED driver for commercial lighting with universal AC input and high efficiency. IC Role / Device Role / Timing Role: Regulates bulk DC bus to 400 V while enforcing sinusoidal line current; interfaces with downstream LLC controller. Use Value: Reduces input filter size and EMI filtering cost versus passive PFC solutions, supporting compact form factors. |
| Industrial AC/DC Module | Consumer Audio Power Supply |
|
Use Scenario: DIN-rail mounted 250 W industrial power module requiring extended temperature operation (–40°C to +85°C). IC Role / Device Role / Timing Role: Primary PFC controller in isolated flyback + boost hybrid topology; handles 85–265 VAC input range. Use Value: Guaranteed operation across full industrial temperature range - unlike UCC3818 - with no derating or thermal margin loss. |
Use Scenario: High-fidelity audio amplifier power supply where low-noise, low-ripple DC rails are critical. IC Role / Device Role / Timing Role: Implements transition-mode boost PFC to minimize conducted EMI and transformer audible noise. Use Value: Leading-edge modulation reduces bulk capacitor ripple current by up to 30%, lowering RMS heating and improving PSRR. |
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 |
|---|---|---|---|
| UCC2817DG4 | Higher UVLO (16 V/10 V), wider operating temperature (–40°C to +85°C), same pinout and function | Better suited for high-line or unstable AC grids where 10.5 V turn-on may cause marginal startup | Select UCC2817DG4 when higher UVLO margin is required; otherwise UCC2818DG4 offers tighter control at lower line voltages |
| FAN4803SJX | Fixed 65 kHz frequency, no RT/CT programming, lower gate drive (0.5 A peak), no VFF feed-forward | Limited to fixed-frequency CCM designs; lacks line-voltage feed-forward for optimal light-load THD | Choose FAN4803SJX for cost-sensitive, fixed-frequency PFC where design simplicity outweighs THD and efficiency optimization |
Compared with UCC2818DG4, UCC2817DG4 provides higher UVLO headroom for unreliable mains, while FAN4803SJX trades programmability and feed-forward capability for lower BOM count and fixed-frequency predictability - making UCC2818DG4 optimal for variable-frequency, high-THD-performance applications.
Availability
UCC2818DG4 is available at Aetrix Electronics and suitable for PC power supplies, LED driver front-ends, and industrial AC/DC modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for UCC2818DG4 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 ICs, with decades of expertise in power conversion and energy-efficient system design.
The UCC2818DG4 belongs to TI's BiCMOS PFC controller product line, engineered specifically for high-efficiency, low-distortion active power factor correction in sub-300 W universal-input AC/DC power supplies.
FAQ
What is the UVLO behavior of the UCC2818DG4?
The UCC2818DG4 features an undervoltage lockout with 10.5 V turn-on and 9.7 V turn-off thresholds, yielding only 0.3–0.5 V hysteresis. This narrow window ensures rapid response to brownouts while maintaining reliable startup across universal AC inputs. Unlike the UCC2817DG4, the UCC2818DG4 is optimized for lower-line stability - critical in regions with frequent low-voltage grid conditions.
How does the UCC2818DG4 implement zero-power detection?
The UCC2818DG4 monitors VAOUT with an internal comparator that trips at 0.33 V. When VAOUT falls below this threshold - indicating no load or output fault - the comparator latches DRVOUT low, halting switching and reducing standby power to near-zero. This feature is integral to meeting stringent no-load efficiency requirements in ENERGY STAR and EU CoC Tier 2 designs using UCC2818DG4.
Can the UCC2818DG4 be used in discontinuous conduction mode (DCM)?
Yes, the UCC2818DG4 supports both continuous and discontinuous conduction modes via its average current mode architecture and leading-edge modulation. In DCM, it maintains stable regulation and low THD by dynamically adjusting duty cycle based on sensed line current and feed-forward voltage (VFF). Designers confirm DCM operation in ≤150 W LED drivers using UCC2818DG4 with appropriate CT/RT values.
What is the purpose of the VFF pin on the UCC2818DG4?
The VFF pin on the UCC2818DG4 delivers a filtered RMS representation of the AC line voltage, generated by mirroring half the IAC current into an external RC network. At low line (e.g., 85 VAC), VFF settles near 1.4 V - scaling the multiplier gain to maintain constant power limit and improve line regulation. This feed-forward action is essential for achieving <5% THD across full input range in UCC2818DG4-based designs.
Does the UCC2818DG4 require external compensation components?
Yes, the UCC2818DG4 requires external compensation on both the voltage amplifier (VAOUT–VSENSE) and current amplifier (CAOUT–MOUT) loops. A Type II or III network is typically placed between CAOUT and MOUT to stabilize the current loop, while a Type II network connects VAOUT to VSENSE to ensure phase margin >45°. These networks are mandatory for stable PFC operation and are validated in TI's UCC2818DG4 reference designs.
UCC2818DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
UCC2818DG4 FAQ
1.How can I place an order for UCC2818DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2818DG4 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 UCC2818DG4 reliable?
The price and inventory of UCC2818DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2818DG4 is usually 5 days.
3.What payment methods are accepted for UCC2818DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2818DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2818DG4?
UCC2818DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2818DG4 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 UCC2818DG4?
For technical support, including UCC2818DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2818DG4 requirements.
6.How does Aetrix verify that UCC2818DG4 is sourced from the original manufacturer or authorized distributors?
All UCC2818DG4 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 UCC2818DG4 meets industry standards.
7.What is the process for return or replacement of UCC2818DG4?
All UCC2818DG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC2818DG4, 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 UCC2818DG4 part is unused and in its original packaging.
Return procedure for UCC2818DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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