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Texas Instruments UCC2818APW
- Part No.:
- UCC2818APW
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC2818APW.pdf
- Description:
- IC PFC CTRLR AVER 220KHZ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,295
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Product details
Overview
UCC2818APW 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 <300 W IEC 61000-3-2-compliant AC/DC supplies.
For engineers reviewing the UCC2818APW datasheet, UCC2818APW pinout, UCC2818APW application, or UCC2818APW 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 layout constraints for industrial PFC stages.
Technical Context
The UCC2818APW implements average current-mode control using a high-gain (90 dB) current amplifier and a precision 7.5 V reference (±1.5% over temperature), enabling low-distortion sinusoidal line current shaping. Its multiplier accepts feed-forward voltage (VFF), error amplifier output (VAOUT), and line-current-proportional current (IAC) to generate duty-cycle commands.
It integrates leading-edge PWM modulation synchronized to the boost switch zero-current crossing, reducing bulk capacitor ripple current. The device supports world-wide line operation (85–265 VAC) via VFF scaling and includes overvoltage protection (OVP/EN pin with 1.07% reference accuracy and 500 mV hysteresis) and accurate power limiting via PKLMT input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Turn-on | 10.2 V - ensures reliable start-up from fixed supply without bootstrap circuitry |
| Reference Voltage | 7.5 V ±1.5% - stable bias for external compensation networks and sensing |
| Gate Drive Peak Current | ±1.2 A - drives MOSFET gates directly with minimal external buffering |
| Oscillator Frequency Range | 6 kHz to 220 kHz - programmable via RT/CT for optimal EMI and efficiency trade-offs |
| Current Amplifier Offset | –3.5 mV to +2.5 mV - minimizes light-load current distortion in average-mode control |
| Soft-Start Charge Current | –6 µA to –16 µA - controls ramp rate of SS pin voltage to limit inrush during startup |
| Zero-Power Threshold | 0.2 V to 0.5 V on VAOUT - disables switching when output regulation fails or load drops |
Pinout & Package
TSSOP-16 package (5.00 mm × 4.40 mm body size), thermally optimized for surface-mount PFC stage integration with exposed pad option not supported.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power and signal reference | Common return for VCC bypass, current sense, and analog blocks; requires low-inductance ceramic decoupling |
| 2 PKLMT | Peak current limit input | Accepts level-shifted voltage from current-sense resistor; triggers shutdown when below 0 V |
| 3 CAOUT | Current amplifier output | Drives PWM latch; connects to MOUT for compensation network placement |
| 4 CAI | Current amplifier non-inverting input | Connects to ground side of current-sense resistor; operates down to below GND |
| 5 MOUT | Multiplier output / current amp inverting input | High-impedance node combining VAOUT, IAC, and VFF signals; sets current command |
| 6 IAC | Line-voltage proportional current input | Accepts up to 500 µA; defines multiplier gain and feed-forward scaling |
| 7 VAOUT | Voltage amplifier output | Regulates boost output voltage; clamped at ~5.5 V to prevent overshoot |
| 8 VFF | Feed-forward voltage input | Derived from IAC mirror; sets 1.4 V at low line, 4.7 V at high line for RMS compensation |
| 9 VREF | 7.5 V reference output | Supplies bias to external circuits; short-circuit protected; disabled below UVLO |
| 10 OVP/EN | Overvoltage/enable input | Window comparator: disables DRVOUT above programmed threshold or below 1.9 V |
| 11 SSENSE | Voltage amplifier inverting input | Connected to output divider; forms feedback loop with VAOUT for output regulation |
| 12 RT | Oscillator timing current input | Sets charging current for CT; nominal 3 V; 10 kΩ–100 kΩ recommended |
| 13 SS | Soft-start control | Charged by internal current source; modulates PWM duty cycle during startup |
| 14 CT | Oscillator timing capacitor | Defines switching frequency with RT; requires short, low-inductance GND trace |
| 15 VCC | Positive supply input | 12–18 V operation; bypass directly to GND with ≥0.1 µF ceramic capacitor |
| 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 | Stable, low-distortion line current shaping across universal AC input (85–265 VAC) |
| Leading-edge PWM modulation | Reduces bulk capacitor ripple current and extends electrolytic capacitor lifetime |
| Accurate 7.5 V reference | ±1.5% tolerance over –40°C to +85°C enables precise voltage feedback and sensing |
| Integrated overvoltage protection | 1.07% OVP reference with 500 mV hysteresis prevents boost output overvoltage damage |
| Low start-up current | 150 µA typical allows direct connection to fixed VCC without auxiliary winding |
| World-wide line operation support | VFF scaling and feed-forward architecture maintain regulation and PF >0.95 from 85–265 VAC |
Applications
| PC Power Supply | LED Driver Input Stage |
|---|---|
Use Scenario: 250 W ATX-compatible front-end with active PFC stage before LLC resonant converter. IC Role / Device Role / Timing Role: UCC2818APW configures boost converter to shape input current waveform matching AC line voltage phase. Use Value: Achieves >0.98 power factor and meets IEC 61000-3-2 Class D harmonic limits without passive filtering. |
Use Scenario: Constant-power LED driver for commercial lighting with universal AC input and dimmable output. IC Role / Device Role / Timing Role: UCC2818APW regulates boost output to stable 400 V DC bus feeding downstream buck or flyback LED controller. Use Value: Enables single-stage design with <3% THD and >92% efficiency at full load under 230 VAC input. |
| Industrial AC/DC Adapter | Appliance Motor Drive Pre-regulator |
Use Scenario: 150 W sealed enclosure adapter for factory automation sensors requiring wide temperature operation. IC Role / Device Role / Timing Role: UCC2818APW provides regulated DC bus while maintaining conduction through –40°C to +85°C ambient. Use Value: Eliminates need for derating or thermal margining; supports extended temperature qualification per IEC 60730. |
Use Scenario: Variable-speed motor control system with integrated PFC for HVAC blower module. IC Role / Device Role / Timing Role: UCC2818APW delivers stable 380 V DC bus to inverter stage, synchronized to zero-crossing detection. Use Value: Reduces input filter size by 40% vs passive PFC and enables compliance with EN 61000-3-12. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2817APW | 16 V UVLO turn-on threshold; shunt regulator integrated for bootstrap supply use | Preferred where no fixed VCC rail exists; requires external Zener or auxiliary winding | Select UCC2817APW only if bootstrap operation is required; otherwise UCC2818APW simplifies supply design |
| UCC3818APW | 0°C to 70°C operating range; identical pinout and electrical specs except temperature grade | Restricted to commercial-temperature environments; lower cost for non-industrial designs | Choose UCC3818APW for cost-sensitive consumer applications with ambient <70°C; UCC2818APW required for industrial deployment |
Compared with UCC2817APW and UCC3818APW, the UCC2818APW uniquely combines extended temperature rating (–40°C to +85°C), fixed-supply optimization (10.2 V UVLO), and TSSOP-16 packaging-making it the sole choice for ruggedized, fixed-rail PFC stages in industrial and outdoor equipment.
Availability
UCC2818APW is available at Aetrix Electronics and suitable for PC power supplies, LED driver input stages, and industrial AC/DC adapters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for UCC2818APW 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 design.
The UCC2818APW belongs to TI's UCCx81xA BiCMOS PFC controller family, engineered specifically for high-efficiency, low-distortion active power factor correction in universal-input, sub-300 W AC/DC systems.
FAQ
What is the operating temperature range of the UCC2818APW?
The UCC2818APW is rated for operation from –40°C to +85°C ambient temperature, making it suitable for industrial, outdoor, and automotive-adjacent power supply applications where extended thermal performance is required. This distinguishes it from the UCC3818APW (0°C to 70°C) and aligns with the UCC2817APW's temperature grade but not its UVLO architecture. All specifications in the datasheet are guaranteed across this full range.
How does the UCC2818APW differ from the UCC2817APW in terms of supply configuration?
The UCC2818APW is designed for fixed VCC supply operation with a 10.2 V UVLO turn-on threshold, eliminating the need for a bootstrap or auxiliary winding. In contrast, the UCC2817APW integrates an on-chip shunt regulator and uses a 16 V UVLO, enabling direct connection to rectified AC lines. Both share identical pinout and functional blocks, but their supply architectures are mutually exclusive-UCC2818APW cannot replace UCC2817APW in bootstrap designs without circuit redesign.
What is the purpose of the VFF pin on the UCC2818APW?
The VFF (voltage feed-forward) pin on the UCC2818APW accepts a scaled RMS representation of the AC input voltage, generated externally from the IAC current source. At low line (85 VAC), VFF ≈ 1.4 V; at high line (265 VAC), VFF ≈ 4.7 V. This signal dynamically adjusts the multiplier gain to maintain constant power delivery and near-unity power factor across universal input ranges-critical for meeting IEC 61000-3-2 harmonic standards.
Can the UCC2818APW be used in critical conduction mode (CRM) applications?
Yes-the UCC2818APW supports both continuous conduction mode (CCM) and critical conduction mode (CRM) operation. Its average current-mode architecture, combined with the MOUT/CAI interface and zero-power comparator, enables stable CRM control in sub-300 W designs. TI application note SLUA357 confirms CRM implementation using UCC2818APW with valley-switching gate drive synchronization and appropriate RT/CT selection for variable-frequency operation.
What is the maximum recommended gate resistor value for the DRVOUT pin of the UCC2818APW?
TI recommends a series gate resistor between 10 Ω and 22 Ω for the UCC2818APW DRVOUT pin when driving typical 600 V MOSFETs. This value balances rise/fall time control (25–50 ns typical) against overshoot suppression and driver thermal dissipation. With a typical pulldown resistance of 4 Ω and pullup of 9 Ω, a 11 Ω external resistor yields ~1.2 A peak sink current at 18 V VCC-matching the device's specified drive capability without exceeding SOA limits.
UCC2818APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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-TSSOP
UCC2818APW FAQ
1.How can I place an order for UCC2818APW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2818APW 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 UCC2818APW reliable?
The price and inventory of UCC2818APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2818APW is usually 5 days.
3.What payment methods are accepted for UCC2818APW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2818APW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2818APW?
UCC2818APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2818APW 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 UCC2818APW?
For technical support, including UCC2818APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2818APW requirements.
6.How does Aetrix verify that UCC2818APW is sourced from the original manufacturer or authorized distributors?
All UCC2818APW 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 UCC2818APW meets industry standards.
7.What is the process for return or replacement of UCC2818APW?
All UCC2818APW units undergo pre-shipment inspection (PSI). If there is an issue with UCC2818APW, 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 UCC2818APW part is unused and in its original packaging.
Return procedure for UCC2818APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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