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Texas Instruments UCC2819APW
- Part No.:
- UCC2819APW
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC2819APW.pdf
- Description:
- IC PFC CTRLR AVER 250KHZ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:167
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Product details
Overview
UCC2819APW from Texas Instruments is a BiCMOS active power factor correction (PFC) controller for boost preregulators, operating from 10.8 V to 17 V with 150 µA typical start-up current and −40°C to +85°C temperature range. It implements average current mode control with leading-edge modulation, programmable output voltage via VAI pin, and integrated over-voltage protection - enabling tracking-boost PFC in industrial AC/DC front-ends.
For engineers reviewing the UCC2819APW datasheet, UCC2819APW pinout, UCC2819APW application, or UCC2819APW equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, and two confirmed alternative PFC controllers with documented functional and application differences.
Technical Context
The UCC2819APW uses an analog multiplier with feed-forward (VFF) and voltage error amplifier (VAOUT) to shape line current for near-unity power factor. Its current amplifier (CAI/MOUT) supports average current mode control with zero-power comparator threshold at 0.33 V and peak current limit sensing via PKLMT pin referenced to GND.
It integrates a 100 kHz oscillator (±15% initial accuracy), ±1.2 A peak gate driver (DRVOUT), 7.5 V reference (VREF), and UVLO with 10.2 V turn-on/9.7 V turn-off thresholds. The VAI pin enables dynamic output voltage programming - critical for RMS-tracking boost topologies that reduce inductor size and MOSFET conduction losses at low line voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | −40°C to +85°C - qualified for industrial-grade AC/DC power supplies requiring extended thermal margin. |
| Supply Voltage Range | 10.8 V to 17 V - supports stable operation across wide bias rail variations; UVLO hysteresis ensures clean startup/shutdown. |
| Oscillator Frequency | 80–120 kHz - set by RT/CT; enables optimized EMI filtering and core loss trade-offs in 100–200 W PFC stages. |
| Gate Drive Capability | ±1.2 A peak - drives MOSFET gates directly with fast rise/fall times (25 ns/10 ns into 1 nF), minimizing switching losses. |
| Voltage Reference | 7.5 V ±13 mV - high-accuracy internal reference powers external circuitry and sets feedback divider ratios. |
| Power Limit Accuracy | PKLMT threshold = 0 V - enables precise peak current limiting using resistor-divider level-shifting from sense resistor. |
| Start-Up Current | 150 µA typical - reduces auxiliary supply burden and enables efficient high-voltage startup circuits. |
Pinout & Package
TSSOP-16 (PW) package: 5.0 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, moisture sensitivity level 2 (260°C reflow, 1-year floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return for all analog and power signals; requires low-inductance 0.1 µF ceramic bypass to VCC/VREF. |
| PKLMT (Pin 2) | Peak current limit input | Sense resistor voltage level-shifted to 0 V threshold; triggers current limit when signal falls below 0 V. |
| CAOUT (Pin 3) | Current amplifier output | Drives PWM latch; compensation network placed between CAOUT and MOUT for stability in average current mode. |
| CAI (Pin 4) | Current amplifier non-inverting input | Connected to GND-side of current-sense resistor; operates down to and below GND for bidirectional sensing. |
| MOUT (Pin 5) | Multiplier output / CA inverting input | High-impedance node combining multiplier current and CA feedback; enables differential configuration for noise immunity. |
| IAC (Pin 6) | Line voltage proportional current input | Accepts up to 500 µA current proportional to instantaneous line voltage; defines multiplier gain and distortion performance. |
| VAOUT (Pin 7) | Voltage error amplifier output | Regulates boost output voltage; internally clamped to ~5.5 V to prevent overshoot during transients. |
| VFF (Pin 8) | Feed-forward RMS voltage | Generated by mirroring IAC through external RC filter; scales VAOUT reference for line-voltage tracking. |
| VREF (Pin 9) | 7.5 V reference output | Supplies 20 mA; disabled below UVLO; used for biasing dividers, PKLMT level-shifting, and VAI reference. |
| OVP/EN (Pin 10) | Over-voltage / enable input | Window comparator: disables DRVOUT above programmed OVP threshold or resets SS if pulled below 1.9 V. |
| VSENSE (Pin 11) | Voltage amplifier inverting input | Connected to output voltage divider; forms feedback loop with VAOUT and VAI to regulate boost output. |
| RT (Pin 12) | Oscillator timing current | Resistor to GND programs charging current; nominal 3 V on pin; 10–100 kΩ range recommended. |
| VAI (Pin 13) | Voltage amplifier non-inverting input | Externally accessible reference point - tied to VFF for tracking boost or to fixed voltage for constant output. |
| CT (Pin 14) | Oscillator timing capacitor | Capacitor to GND sets frequency per f ≈ 0.6/(RT×CT); short, direct trace required for stability. |
| VCC (Pin 15) | Positive supply input | Requires ≥20 mA supply; bypassed directly to GND; inhibits DRVOUT until UVLO threshold is exceeded. |
| DRVOUT (Pin 16) | Gate drive output | Totem-pole MOSFET driver; series gate resistor recommended to damp ringing with capacitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Enables low-distortion sinusoidal line current shaping for >0.99 power factor across universal AC input (85–265 VAC). |
| Programmable output voltage (VAI pin) | Allows RMS-tracking boost topology - output voltage scales with line voltage, reducing inductor size and MOSFET stress at low line. |
| Leading-edge modulation | Reduces ripple current in bulk capacitor compared to trailing-edge schemes, lowering capacitor RMS current and extending lifetime. |
| Over-voltage protection (OVP) | Dedicated OVP/EN pin with window comparator prevents damage from output overvoltage events without external circuitry. |
| Low start-up current (150 µA) | Minimizes auxiliary supply loading and enables cost-effective high-voltage startup networks using large-value resistors. |
Applications
| Industrial AC/DC Power Supplies | Server & Telecom Rectifiers |
|---|---|
|
Use Scenario: 300–800 W front-end with universal AC input and high-efficiency requirements. IC Role / Device Role / Timing Role: Primary PFC controller managing boost switch duty cycle via average current mode to enforce sinusoidal line current. Use Value: Achieves >0.99 PF across 85–265 VAC while supporting tracking-boost to reduce conduction losses and component stress at low line. |
Use Scenario: High-density 48 V telecom rectifier with strict THD and efficiency targets. IC Role / Device Role / Timing Role: Active PFC controller implementing feed-forward line regulation and accurate power limiting. Use Value: Delivers tight output voltage regulation (±1%) and robust OVP response, meeting GR-1089 Class 5 surge immunity requirements. |
| Medical Equipment Power Modules | LED Driver Front-Ends |
|
Use Scenario: IEC 60601-1 compliant 250 W medical AC/DC module requiring low leakage and high reliability. IC Role / Device Role / Timing Role: PFC controller with isolated feedback interface and UVLO hysteresis for safe startup under brownout conditions. Use Value: Supports 2×MOPP isolation designs via optocoupler-coupled VSENSE path and meets EN 61000-3-2 Class C harmonic limits. |
Use Scenario: 150 W outdoor LED streetlight with wide input range and high PF mandate (≥0.9). IC Role / Device Role / Timing Role: Boost PFC controller driving discrete MOSFET with programmable output voltage for downstream buck converter headroom optimization. Use Value: Enables 30 V–42 V adjustable output via VAI pin, improving system efficiency by 1.2% at nominal line versus fixed-output alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2818APW | Lacks VAI pin; non-inverting input of voltage amplifier not exposed - no output voltage tracking capability. | Fixed-output boost only; unsuitable for RMS-tracking or adaptive output voltage schemes. | Select UCC2819APW when dynamic output scaling is required; choose UCC2818APW for simpler, lower-cost fixed-output designs. |
| UCC28070PW | Dual-channel interleaved PFC controller; higher integration (no external multiplier needed); 65–300 kHz programmable frequency. | Supports >1 kW interleaved topologies; requires different compensation and layout due to dual-phase operation. | Choose UCC28070PW for higher power or lower EMI; retain UCC2819APW for cost-sensitive single-phase ≤800 W designs with tracking needs. |
Compared with UCC2818APW, UCC2819APW adds VAI-based output voltage programmability essential for tracking boost, while UCC28070PW replaces discrete multiplier architecture with dual-channel interleaving - making UCC2819APW the optimal choice for mid-power, adaptive-output PFC where layout simplicity and BOM cost are prioritized.
Availability
UCC2819APW is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, server rectifiers, and medical equipment power modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UCC2819APW 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 UCC2819APW belongs to TI's BiCMOS PFC controller product line, engineered specifically for high-performance active power factor correction in universal-input AC/DC front-ends targeting industrial, telecom, and medical applications.
FAQ
What is the operating temperature range of the UCC2819APW?
The UCC2819APW is rated for −40°C to +85°C ambient operation, qualifying it for industrial-grade power supplies where thermal robustness is critical. This range is confirmed in the "Available Options Table" and electrical characteristics section of SLUS579, specifying test conditions for UCC2819A variants. The TSSOP-16 (PW) package supports this full range with θja of 123–147°C/W on standard FR4 PCBs.
How does the VAI pin function in the UCC2819APW?
The VAI pin on the UCC2819APW is the non-inverting input of the internal voltage error amplifier, externally accessible to enable programmable output voltage. When tied to VFF, it implements RMS-tracking boost - scaling the regulated output proportionally with line voltage. This reduces inductor size and MOSFET conduction losses at low line, as detailed in Figure 1 and Application Information section of SLUS579.
What is the purpose of the PKLMT pin on the UCC2819APW?
The PKLMT pin on the UCC2819APW serves as the peak current limit threshold input, referenced to 0 V. A resistor divider from the negative side of the current-sense resistor to VREF level-shifts the sensed voltage so that PKLMT falls below 0 V at the desired peak current. This triggers immediate current limiting, ensuring precise control of boost switch conduction time per cycle.
Does the UCC2819APW support over-voltage protection?
Yes, the UCC2819APW provides dedicated over-voltage protection via the OVP/EN pin - a window comparator that disables DRVOUT when the boost output exceeds a user-programmed threshold (VREF + 0.48 V to VREF + 0.52 V). It also offers enable functionality, resetting soft-start if pulled below 1.9 V, as specified in the Electrical Characteristics table under "Over Voltage Protection and Enable".
What package type is used for the UCC2819APW?
The UCC2819APW uses the TSSOP-16 (PW) package: 5.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm maximum height, and moisture sensitivity level 2 (260°C reflow, 1-year floor life). This is explicitly stated in the "AVAILABLE OPTIONS TABLE", "PACKAGE OPTION ADDENDUM", and "PACKAGE OUTLINE" sections of SLUS579 and TI's packaging documentation.
UCC2819APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Mode:
- Average Current
- Frequency - Switching:
- 250kHz
- Current - Startup:
- 150 µA
- Voltage - Supply:
- 10.8V ~ 17V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
UCC2819APW FAQ
1.How can I place an order for UCC2819APW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2819APW 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 UCC2819APW reliable?
The price and inventory of UCC2819APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2819APW is usually 5 days.
3.What payment methods are accepted for UCC2819APW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2819APW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2819APW?
UCC2819APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2819APW 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 UCC2819APW?
For technical support, including UCC2819APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2819APW requirements.
6.How does Aetrix verify that UCC2819APW is sourced from the original manufacturer or authorized distributors?
All UCC2819APW 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 UCC2819APW meets industry standards.
7.What is the process for return or replacement of UCC2819APW?
All UCC2819APW units undergo pre-shipment inspection (PSI). If there is an issue with UCC2819APW, 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 UCC2819APW part is unused and in its original packaging.
Return procedure for UCC2819APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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