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Texas Instruments UCC2818APWR
- Part No.:
- UCC2818APWR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC2818APWR.pdf
- Description:
- IC PFC CTRLR AVER 220KHZ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,623
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Product details
Overview
UCC2818APWR from Texas Instruments is a BiCMOS average current-mode power factor correction (PFC) controller for boost preregulators, operating from 12 V to 18 V VCC, featuring 10.2 V UVLO turn-on threshold, 7.5 V reference output, and ±1.2 A peak gate drive capability. It enables near-unity power factor in sub-300 W IEC 61000-3-2-compliant AC/DC supplies.
For engineers reviewing the UCC2818APWR datasheet, UCC2818APWR pinout, UCC2818APWR application, or UCC2818APWR equivalent, key selection criteria include UVLO hysteresis (0.3–0.5 V), soft-start charge current (–6 to –16 µA), zero-power comparator threshold (0.2–0.5 V), and compatibility with TSSOP-16 packaging for high-density PFC stage layout.
Technical Context
The UCC2818APWR implements average current-mode control using a high-gain current amplifier (90 dB open-loop gain, ±2 mV offset) and a three-input analog multiplier (IAC, VAOUT, VFF) to shape line current. Its leading-edge PWM modulation reduces bulk capacitor ripple current when synchronized with downstream DC-DC stages.
It integrates a 7.5 V precision reference (±1.5% over temperature), UVLO with 10.2 V turn-on/9.7 V turn-off thresholds, and overvoltage protection triggered at VREF + 0.50 V with 500 mV hysteresis. The oscillator frequency (80–120 kHz typical) is set by RT and CT pins and supports stable operation across –40°C to 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Turn-on | 10.2 V - ensures reliable startup only after stable bias supply is established |
| VREF Output | 7.5 V ±1.5% - provides accurate, temperature-stable reference for voltage sensing and peripheral bias |
| Gate Drive Current | ±1.2 A peak - drives MOSFET gates directly without external buffers in medium-power designs |
| Oscillator Frequency | 80–120 kHz - balances EMI suppression and magnetics size for <300 W PFC stages |
| Zero-Power Threshold | 0.2–0.5 V on VAOUT - disables switching when output regulation collapses, preventing uncontrolled conduction |
| Current Amp Offset | ±2 mV - minimizes line-current distortion at light load by preserving accuracy in current-sense path |
| Soft-Start Charge | –6 to –16 µA - controls ramp rate of SS pin voltage to limit inrush current during power-up |
Pinout & Package
TSSOP-16 package (5.00 mm × 4.40 mm body), thermally enhanced for surface-mount PFC controller placement with exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power and signal reference | Return path for all internal circuits; must be low-impedance connection to PCB ground plane |
| 2 PKLMT | Peak current limit input | Accepts voltage derived from current-sense resistor; triggers shutdown when ≤0 V |
| 3 CAOUT | Current amplifier output | Drives MOUT node; used for compensation network between CAOUT and MOUT |
| 4 CAI | Current amplifier noninverting input | Connects to GND side of current-sense resistor; operates down to below GND |
| 5 MOUT | Multiplier output / current amp inverting input | High-impedance node combining multiplier output and current feedback; enables differential sensing |
| 6 IAC | Line voltage proportional current input | Accepts up to 500 µA current representing rectified AC line; sets feed-forward scaling |
| 7 VAOUT | Voltage amplifier output | Regulates boost output voltage; clamped to ~5.5 V to prevent overshoot |
| 8 VFF | Feed-forward voltage input | Accepts RMS-derived voltage (1.4 V at low line); improves line regulation and harmonic suppression |
| 9 VREF | 7.5 V reference output | Supplies bias for external circuits; short-circuit protected; disabled below UVLO |
| 10 OVP/EN | Overvoltage/enable input | Window comparator: disables DRVOUT if >VREF+0.50 V or <1.9 V (enables brownout protection) |
| 11 SSENSE | Voltage amplifier inverting input | Connects to output voltage divider; sets regulated output voltage level via feedback ratio |
| 12 RT | Oscillator timing current input | Sets charging current for CT capacitor; 10–100 kΩ recommended for 6–220 kHz range |
| 13 SS | Soft-start control | Charged by internal current source; modulates PWM duty cycle during startup to limit inrush |
| 14 CT | Oscillator timing capacitor | Connected to GND; sets switching frequency with RT; requires short, direct trace |
| 15 VCC | Supply voltage input | 12–18 V operation; bypass with ≥0.1 µF ceramic capacitor directly to GND |
| 16 DRVOUT | Gate driver output | Totem-pole MOSFET driver; pulldown resistance ~4 Ω, pullup ~9 Ω; requires series gate resistor |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Maintains low-distortion sinusoidal line current across universal AC input (85–265 VAC) without external current transformers |
| Leading-edge PWM modulation | Reduces bulk capacitor ripple current when synchronized with secondary-stage DC-DC converter, extending capacitor lifetime |
| Integrated 7.5 V reference | ±1.5% accuracy over –40°C to 85°C enables precise voltage feedback without external references |
| Overvoltage protection (OVP) | Hardware-based shutdown at VREF + 0.50 V with 500 mV hysteresis prevents catastrophic output overvoltage events |
| Low start-up current | 150 µA typical allows bootstrap startup from auxiliary winding without dedicated bias supply |
Applications
| PC Power Supplies | Consumer Electronics Adapters |
|---|---|
Use Scenario: 250 W ATX main power supply with active PFC stage meeting IEC 61000-3-2 Class D limits. IC Role / Device Role / Timing Role: Primary PFC controller regulating boost output to 385 VDC while shaping 85–265 VAC input current. Use Value: Enables compliance with harmonic current standards using single-chip solution with no external current sense transformer. |
Use Scenario: 120 W laptop adapter requiring >0.95 power factor and <10% THD across global line voltages. IC Role / Device Role / Timing Role: Average current-mode PFC controller driving 600 V MOSFET in continuous conduction mode boost stage. Use Value: Delivers stable regulation and low distortion even at 10% load due to ±2 mV current amplifier offset and feed-forward line compensation. |
| LED Driver Front-Ends | Industrial AC/DC Modules |
Use Scenario: 150 W constant-current LED driver with integrated PFC for streetlight applications. IC Role / Device Role / Timing Role: PFC controller managing boost stage before isolated flyback or LLC stage; interfaces with dimming control circuitry. Use Value: Supports wide ambient temperature range (–40°C to 85°C) and maintains <5% output voltage deviation under 30% line sag. |
Use Scenario: DIN-rail mounted 200 W industrial power module requiring long-term reliability and thermal robustness. IC Role / Device Role / Timing Role: Core PFC controller in sealed enclosure with limited airflow; relies on TSSOP-16 thermal metrics (RθJA = 98.9°C/W). Use Value: BiCMOS process delivers low quiescent power (4 mA typical operating current), reducing self-heating in confined spaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2817APWR | 16 V UVLO turn-on threshold; includes internal shunt regulator for bootstrap supply use | Better suited for designs lacking fixed VCC rail; higher UVLO enables operation with higher-voltage auxiliary windings | Select when primary-side bias is derived from boost output or auxiliary winding rather than dedicated supply |
| UCC3818AD | SOIC-16 package; same electrical specs but rated for 0°C to 70°C ambient | Limited to commercial-temperature environments; lower thermal resistance (RθJA = 73.9°C/W) aids board-level cooling | Choose for cost-sensitive, non-industrial applications where extended temperature range is unnecessary |
Compared with UCC2817APWR and UCC3818AD, the UCC2818APWR uniquely combines extended temperature rating (–40°C to 85°C), TSSOP-16 compact footprint, and 10.2 V UVLO optimized for fixed-bias systems-making it ideal for space-constrained, thermally demanding industrial PFC designs.
Availability
UCC2818APWR is available at Aetrix Electronics and suitable for PC power supplies, consumer electronics adapters, LED driver front-ends, and industrial AC/DC modules requiring stable component supply with full traceability and lifecycle support.
Supply support for UCC2818APWR 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 delivering analog and embedded processing solutions, with leadership in power management ICs and industrial-grade reliability.
The UCC2818APWR belongs to TI's UCCx81xA BiCMOS PFC controller family, designed specifically for high-efficiency, near-unity power factor correction in sub-300 W boost preregulators compliant with IEC 61000-3-2.
FAQ
What is the UVLO behavior of the UCC2818APWR?
The UCC2818APWR features an undervoltage lockout with 10.2 V turn-on threshold and 9.7 V turn-off threshold, yielding 0.3–0.5 V hysteresis. This ensures clean startup once VCC exceeds 10.2 V and prevents oscillation near the threshold. Below 9.7 V, the DRVOUT pin is disabled and the SS pin discharges rapidly to halt switching-protecting the system during brownout conditions. The UCC2818APWR does not include an internal shunt regulator like the UCC2817A variant.
How does the UCC2818APWR implement average current-mode control?
The UCC2818APWR uses a dedicated current amplifier with 90 dB open-loop gain and ±2 mV input offset to precisely compare sensed inductor current (via CAI and MOUT pins) against the multiplier output. This error signal directly modulates PWM duty cycle in real time, maintaining sinusoidal line current even under varying load and line conditions. The architecture eliminates need for slope compensation and supports stable operation without external current transformers.
Can the UCC2818APWR be used in critical conduction mode (CRM)?
No-the UCC2818APWR is explicitly designed for average current-mode control in continuous conduction mode (CCM) boost topologies. Its internal architecture-including fixed-frequency oscillator, multiplier-based current command generation, and CAOUT/MOUT compensation interface-is optimized for CCM operation. For CRM applications, TI recommends the UCC38050 or UCC3819 families instead.
What is the function of the VFF pin on the UCC2818APWR?
The VFF (voltage feed-forward) pin accepts a DC voltage proportional to the RMS value of the AC input (e.g., 1.4 V at low line, ~4.7 V at high line), generated externally via a resistor divider and RC filter from the rectified line. This signal scales the multiplier output to maintain constant power delivery across universal input voltage ranges, improving line regulation and reducing total harmonic distortion (THD) in the input current waveform.
Does the UCC2818APWR support overvoltage protection (OVP)?
Yes-the UCC2818APWR includes hardware-based overvoltage protection via the OVP/EN pin. When voltage at this pin exceeds VREF + 0.50 V (i.e., ~8.0 V), the controller immediately disables DRVOUT and resets the soft-start circuit. The 500 mV hysteresis prevents chatter during transient overvoltage events. Recovery requires VCC cycling or pulling OVP/EN below 1.9 V to re-enable operation.
UCC2818APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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-TSSOP
UCC2818APWR FAQ
1.How can I place an order for UCC2818APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2818APWR 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 UCC2818APWR reliable?
The price and inventory of UCC2818APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2818APWR is usually 5 days.
3.What payment methods are accepted for UCC2818APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2818APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2818APWR?
UCC2818APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2818APWR 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 UCC2818APWR?
For technical support, including UCC2818APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2818APWR requirements.
6.How does Aetrix verify that UCC2818APWR is sourced from the original manufacturer or authorized distributors?
All UCC2818APWR 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 UCC2818APWR meets industry standards.
7.What is the process for return or replacement of UCC2818APWR?
All UCC2818APWR units undergo pre-shipment inspection (PSI). If there is an issue with UCC2818APWR, 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 UCC2818APWR part is unused and in its original packaging.
Return procedure for UCC2818APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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