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Texas Instruments UCC2818DTR
- Part No.:
- UCC2818DTR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC2818DTR.pdf
- Description:
- IC PFC CTR AVERAGE 220KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
UCC2818DTR from Texas Instruments is a BiCMOS active power factor correction (PFC) controller for boost preregulators, implementing average current mode control with leading-edge PWM modulation. It features 7.5-V reference output, 10.5 V/10 V UVLO thresholds, 0.33-V zero-power comparator threshold, and supports IEC 61000-3-2 compliance for sub-300-W supplies.
For engineers reviewing the UCC2818DTR datasheet, UCC2818DTR pinout, UCC2818DTR application, or UCC2818DTR equivalent, key selection criteria include UVLO hysteresis (0.3–0.5 V), soft-start charge current (−6 to −16 µA), gate driver pullup/pulldown resistance (5–12 Ω / 2–10 Ω), peak current limit reference (±15 mV), and multiplier gain constant (0.5–1.5 V⁻¹).
Technical Context
The UCC2818DTR integrates a voltage error amplifier (90 dB open-loop gain, 5.3–5.6 V high-level output), current amplifier (−3.5 to +2.5 mV input offset, 90 dB gain), analog multiplier (three-input: VAOUT, IAC, VFF), and totem-pole gate driver (1.2-A peak sink, 900-mA source). Its oscillator uses RT/CT programming (f ≈ 0.6/(RT × CT)) with ramp amplitude of 3.5–4.5 Vpp.
It implements zero-power detection via VAOUT monitoring (threshold 0.20–0.50 V), overvoltage protection with 300–600 mV hysteresis referenced to VREF+0.5 V, and feed-forward line regulation using VFF (1.4 V at low line, up to 4.7 V at high line). The PKLMT pin enables precise peak current limiting with level-shifted sensing referenced to VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Turn-on/Off | 10.2 V / 9.7 V - Enables operation only within stable supply range; 0.5 V hysteresis prevents chatter during brownout |
| Voltage Reference | 7.5 V ±12 mV - High-accuracy internal reference for all internal comparators and biasing; load-regulated to ≤10 mV deviation |
| Oscillator Frequency | 80–120 kHz - Programmable via RT/CT; initial accuracy ±15% at 25°C ensures predictable switching timing |
| Gate Driver Output | 1.2 A sink / 900 mA source - Drives MOSFET gates directly; pulldown resistance 2–10 Ω minimizes turn-off delay |
| Current Amplifier Offset | −3.5 to +2.5 mV - Low offset maintains line-current waveform fidelity at light loads, reducing THD |
| Multiplexer Gain Constant K | 0.5–1.5 V⁻¹ - Sets scaling between VAOUT, VFF, and IAC for accurate instantaneous power calculation |
| Zero-Power Threshold | 0.33 V - Latches gate drive low when VAOUT falls below this level, enabling efficient no-load shutdown |
Pinout & Package
UCC2818DTR is housed in a 16-pin SOIC (D) package measuring 3.91 mm × 9.9 mm, optimized for surface-mount assembly and thermal dissipation (RθJA = 73.9°C/W on standard FR4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Power and signal reference | All internal voltages referenced to this node; requires direct 0.1-µF ceramic bypass to minimize noise coupling |
| PKLMT (2) | Peak current limit input | Sense signal level-shifted to 0 V threshold; falling below 0 V disables PWM to prevent inductor saturation |
| CAOUT (3) | Current amplifier output | Drives PWM latch via compensation network between CAOUT and MOUT; wide bandwidth enables fast current loop response |
| CAI (4) | Current amplifier noninverting input | Connected to ground-side of current sense resistor; operates down to and below GND for bidirectional sensing |
| MOUT (5) | Multiplier output / CA inverting input | High-impedance node combining multiplier current and CA feedback; enables differential configuration for noise immunity |
| IAC (6) | Line voltage proportional current input | Accepts up to 500 µA current representing rectified AC line; tailored for low distortion across universal input range |
| VAOUT (7) | Voltage error amplifier output | Regulates bulk capacitor voltage; clamped at ~5.5 V to prevent overshoot; feeds zero-power and multiplier blocks |
| VFF (8) | Feed-forward RMS voltage | Generated by mirroring ½ IAC through external RC filter; scales multiplier gain to maintain constant power across line |
| VREF (9) | 7.5-V precision reference output | Supplies bias to external circuitry (20 mA capable); disabled below UVLO; requires local 0.1-µF ceramic bypass |
| OVP/EN (10) | Overvoltage protection / enable | Window comparator: disables driver above VREF+0.5 V or resets SS below 1.9 V (typical) for safe shutdown |
| VSENSE (11) | Voltage error amplifier inverting input | Connected to output divider network; sets regulated bulk voltage via feedback ratio; bias current <200 nA |
| RT (12) | Oscillator charging current input | Resistor to GND programs oscillator frequency; nominal 3 V bias; 10–100 kΩ range recommended |
| SS (13) | Soft-start control | Charges external capacitor with −10 µA (typ) current; used as startup error signal to ramp duty cycle gradually |
| CT (14) | Oscillator timing capacitor | Capacitor to GND sets switching frequency per f ≈ 0.6/(RT × CT); short GND trace required for stability |
| VCC (15) | Supply voltage input | Operates from 10–17 V; >20 mA capability; bypassed directly to GND to absorb gate-drive current spikes |
| DRVOUT (16) | Gate driver output | Totem-pole MOSFET driver; requires series gate resistor (≥11 Ω typical) to damp ringing when driving capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Enables stable, low-distortion sinusoidal line current without slope compensation; improves EMI and THD performance |
| Leading-edge PWM modulation | Synchronizes with downstream DC-DC stage to reduce bulk capacitor ripple current, extending capacitor lifetime |
| Accurate 7.5-V reference | ±12 mV tolerance over −40°C to +85°C enables precise threshold setting for OVP, UVLO, and current sensing |
| Low start-up current | 150 µA typical allows direct bootstrapping from rectified AC line, eliminating auxiliary supply in many designs |
| Integrated zero-power detection | Monitors VAOUT to disable gate drive when output power drops below threshold, reducing no-load losses |
Applications
| PC Power Supplies | Industrial AC-DC Adapters |
|---|---|
|
Use Scenario: 200–300 W ATX-compliant power supplies requiring IEC 61000-3-2 Class D compliance. IC Role / Device Role / Timing Role: Primary PFC controller shaping AC input current to match voltage waveform using average current mode control. Use Value: Achieves near-unity power factor (>0.99) and THD <5% across universal input (90–264 VAC), meeting regulatory limits without passive filtering. |
Use Scenario: Enclosed industrial AC-DC power modules rated 150–250 W for PLCs and motor drives. IC Role / Device Role / Timing Role: Boost preregulator controller managing input current harmonics and regulating 380–400 VDC bus under variable load and line conditions. Use Value: UVLO hysteresis (0.5 V) and extended temperature rating (−40°C to +85°C) ensure reliable startup and operation in harsh environments. |
| LED Lighting Drivers | Consumer Electronics SMPS |
|
Use Scenario: High-efficiency LED drivers for commercial lighting with dimmable 0–10 V or DALI interfaces. IC Role / Device Role / Timing Role: Front-end PFC stage preceding LLC or flyback secondary; maintains regulation during phase-cut dimmer conduction angle variation. Use Value: Feed-forward (VFF) and multiplier architecture adapt gain dynamically, sustaining power factor >0.95 even at 10% dimming level. |
Use Scenario: Universal-input wall adapters and set-top box power supplies targeting Energy Star Tier 2 efficiency. IC Role / Device Role / Timing Role: Active PFC controller enabling high efficiency (>88%) and low standby power (<300 mW) via zero-power detection. Use Value: Soft-start charge current (−10 µA typ) and controlled minimum duty cycle (2%) prevent inrush and enable smooth light-load transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2817DTR | Higher UVLO (16 V/9.7 V vs. 10.2 V/9.7 V); same pinout and functional block diagram | Better suited for high-line industrial systems where VCC is derived from higher-voltage auxiliary winding | Select UCC2817DTR when primary-side VCC exceeds 12 V; UCC2818DTR preferred for universal-input designs with lower auxiliary rails |
| ICE3PCS01G | Fixed-frequency CCM controller; no VFF feed-forward; different pin assignment and compensation structure | Targets cost-sensitive consumer applications; lacks zero-power detection and leading-edge modulation | Choose ICE3PCS01G only if design prioritizes BOM cost over THD performance and light-load efficiency |
Compared with UCC2817DTR and ICE3PCS01G, the UCC2818DTR delivers superior light-load efficiency via zero-power detection, tighter line regulation via VFF feed-forward, and lower THD via average current mode-making it optimal for IEC 61000-3-2-compliant, universal-input, medium-power PFC stages.
Availability
UCC2818DTR is available at Aetrix Electronics and suitable for PC power supplies, industrial AC-DC adapters, and LED lighting drivers requiring stable component supply, long-term lifecycle support, and full traceability.
Supply support for UCC2818DTR 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.
The UCC2818DTR belongs to TI's BiCMOS PFC controller product line, engineered specifically for high-efficiency, low-THD active power factor correction in universal-input, sub-300-W AC-DC power supplies.
FAQ
What is the operating temperature range of the UCC2818DTR?
The UCC2818DTR is specified for operation from −40°C to +85°C ambient temperature, making it suitable for industrial and outdoor-rated power supplies where thermal extremes are encountered. This extended range distinguishes it from the UCC3818 (0°C to +70°C) and aligns with automotive-adjacent and ruggedized equipment requirements. All electrical characteristics in the datasheet are guaranteed across this full range.
How does the UCC2818DTR implement overvoltage protection?
The UCC2818DTR implements overvoltage protection via the OVP/EN pin, which functions as a window comparator. When the sensed output voltage exceeds VREF + 0.50 V (typical), the controller disables DRVOUT to halt switching. Hysteresis of 300–600 mV prevents oscillation near the trip point. Additionally, pulling OVP/EN below 1.9 V (typical) forces an immediate soft-start reset and PWM disable-enabling use as an external enable/shutdown input.
Can the UCC2818DTR be used in discontinuous conduction mode (DCM)?
Yes-the UCC2818DTR supports both continuous conduction mode (CCM) and transition mode (CRM), but it is not designed for pure DCM operation. Its average current mode architecture and internal oscillator are optimized for CRM/CCM boost topologies. For true DCM PFC, TI recommends dedicated controllers such as the UCC28056. Attempting DCM with UCC2818DTR may result in unstable current loop behavior and poor THD.
What is the purpose of the VFF pin on the UCC2818DTR?
The VFF (feed-forward voltage) pin on the UCC2818DTR provides a scaled RMS representation of the AC input voltage, generated by mirroring half the IAC current into an external RC filter. This signal dynamically adjusts the multiplier gain to maintain constant power delivery across universal input ranges (90–264 VAC), improving line regulation and reducing current waveform distortion-especially critical for IEC 61000-3-2 compliance at low line.
Does the UCC2818DTR require external compensation components?
Yes-the UCC2818DTR requires external compensation networks on two critical loops: (1) between CAOUT and MOUT for the current amplifier, and (2) between VSENSE and VAOUT for the voltage error amplifier. These networks stabilize the dual-loop control system and must be designed per TI's application notes (e.g., SLUA146) using measured gain/phase margins. No internal compensation is provided; all poles/zeros are user-configurable.
UCC2818DTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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
UCC2818DTR FAQ
1.How can I place an order for UCC2818DTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2818DTR 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 UCC2818DTR reliable?
The price and inventory of UCC2818DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2818DTR is usually 5 days.
3.What payment methods are accepted for UCC2818DTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2818DTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2818DTR?
UCC2818DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2818DTR 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 UCC2818DTR?
For technical support, including UCC2818DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2818DTR requirements.
6.How does Aetrix verify that UCC2818DTR is sourced from the original manufacturer or authorized distributors?
All UCC2818DTR 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 UCC2818DTR meets industry standards.
7.What is the process for return or replacement of UCC2818DTR?
All UCC2818DTR units undergo pre-shipment inspection (PSI). If there is an issue with UCC2818DTR, 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 UCC2818DTR part is unused and in its original packaging.
Return procedure for UCC2818DTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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