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Texas Instruments UCC3819APW
- Part No.:
- UCC3819APW
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC3819APW.pdf
- Description:
- IC PFC CTRLR AVER 250KHZ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,144
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Product details
Overview
UCC3819APW from Texas Instruments is a BiCMOS active power factor correction (PFC) controller IC for boost preregulators, implementing average current mode control with programmable output voltage tracking, 10.8–17-V operation, and ±1.2-A peak gate drive capability. It achieves near-unity power factor in universal-input AC/DC front-ends for industrial and telecom power supplies.
For engineers reviewing the UCC3819APW datasheet, UCC3819APW pinout, UCC3819APW application, or UCC3819APW equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated TSSOP-16 pin functions, and two confirmed alternative PFC controllers with documented functional and application-level differences.
Technical Context
The UCC3819APW integrates a voltage error amplifier with externally accessible non-inverting input (VAI), a current amplifier with differential inputs (CAI/MOUT), an analog multiplier with feed-forward (VFF) and line-current proportional (IAC) inputs, and a totem-pole gate driver delivering ±1.2 A peak current. Its leading-edge modulation reduces bulk capacitor ripple current.
It uses a programmable oscillator (RT/CT) for 80–120 kHz switching, features over-voltage protection via OVP/EN pin with 0.5-V hysteresis, and includes zero-power comparator threshold at 0.33 V on VAOUT. The device supports tracking boost topology by connecting VAI to VFF, enabling RMS-dependent output voltage scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 80–120 kHz - sets PFC switching frequency via RT/CT; enables stable operation across universal AC input ranges. |
| Gate Drive Peak Current | ±1.2 A - drives MOSFET gates directly with robust sink/source capability, reducing need for external buffer stages. |
| Voltage Reference Output | 7.5 V ±12 mV - precision internal reference for biasing, sensing, and compensation networks; load-regulated to ≤10 mV. |
| UVLO Thresholds | Turn-on: 10.2 V, Turn-off: 9.7 V - ensures reliable start-up and brown-out recovery in noisy supply environments. |
| Over-Voltage Protection | Reference +0.50 V ±20 mV - disables DRVOUT when boost output exceeds programmed threshold; 500-mV hysteresis prevents chatter. |
| Start-Up Current | 150 µA typical - minimizes auxiliary supply burden during initial power-up, improving system efficiency at light load. |
| Operating Supply Range | 10.8 V to 17 V - compatible with standard bias windings and integrated DC/DC supplies without external regulation. |
Pinout & Package
TSSOP-16 (PW) package: 5.0 mm × 4.4 mm × 1.2 mm body, 0.65-mm lead pitch, exposed thermal pad (not electrically connected), RoHS-compliant NIPDAU finish, MSL Level-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Power and signal reference ground | Common return for all analog and power circuits; must be low-impedance connection to minimize noise coupling into CAI/MOUT. |
| PKLMT (2) | Peak current limit threshold input | Accepts level-shifted current-sense signal; triggers current limiting when voltage falls below 0 V; enables precise MOSFET SOA control. |
| CAOUT (3) | Current amplifier output | Drives PWM latch; connects to MOUT for compensation network placement; bandwidth supports stable average current loop up to ~20 kHz. |
| CAI (4) | Current amplifier non-inverting input | Connects to ground side of current-sense resistor; operates down to and below GND, enabling high-side sensing with level-shifting. |
| MOUT (5) | Multiplier output / current amp inverting input | High-impedance node combining multiplier current and CA amplifier feedback; enables leading-edge modulation and improved noise immunity. |
| IAC (6) | Line voltage proportional current input | Accepts 150–500 µA current proportional to instantaneous AC line voltage; optimized for low THD in multiplier path. |
| VAOUT (7) | Voltage error amplifier output | Regulates boost output voltage; internally clamped to ~5.5 V; drives multiplier and zero-power comparator; used for tracking implementation. |
| VFF (8) | Feed-forward RMS voltage output | Provides scaled line-voltage RMS signal; used with VAI to implement tracking boost; roll-off set to 14 V at low line for distortion control. |
| VREF (9) | 7.5-V precision reference output | Supplies bias for external circuits (e.g., PKLMT divider); delivers up to 20 mA; disabled below UVLO; bypassed with ≥0.1-µF ceramic cap. |
| OVP/EN (10) | Over-voltage and enable input | Window comparator: disables DRVOUT above VREF+0.5 V or resets SS and disables PFC if pulled below 1.9 V (typical). |
| VSENSE (11) | Voltage amplifier inverting input | Connects to output voltage divider; forms feedback loop with VAI; determines regulated output voltage level in fixed or tracking mode. |
| RT (12) | Oscillator charging current input | Programs oscillator frequency with 10–100 kΩ resistor to GND; nominal voltage 3 V; sets timing accuracy and temperature stability. |
| VAI (13) | Voltage amplifier non-inverting input | Externally accessible for dynamic output voltage programming; tied to VFF for tracking boost; eliminates need for SS pin used in UCC3818. |
| CT (14) | Oscillator timing capacitor | Connected to GND; sets frequency with RT per f ≈ 0.6/(RT×CT); requires short, direct trace to minimize noise-induced jitter. |
| VCC (15) | Positive supply input | 10.8–17 V operating range; requires ≥20 mA capability and local 0.1-µF ceramic bypass to GND for gate-drive current spikes. |
| DRVOUT (16) | Gate drive output | Totem-pole MOSFET driver; ±1.2-A peak capability; rise/fall times <50 ns into 1-nF load; requires series gate resistor for damping. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable tracking boost output | VAI pin allows output voltage to scale with line RMS (via VFF), reducing boost inductor size and MOSFET conduction losses at low line. |
| Leading-edge modulation | Reduces ripple current in bulk capacitor by aligning PWM edge with current zero-crossing, lowering EMI and thermal stress. |
| Improved noise immunity | Differential current sensing (CAI/MOUT) and high CMRR (>60 dB) suppress common-mode noise from rectified AC lines. |
| Accurate power limiting | PKLMT pin provides precise peak current threshold referenced to 0 V, enabling repeatable MOSFET SOA protection across temperature. |
| Low start-up current | 150 µA typical start-up current minimizes auxiliary supply loading, improving no-load efficiency and simplifying bias design. |
Applications
| Industrial AC/DC Power Supplies | Telecom Rectifier Modules |
|---|---|
|
Use Scenario: 1 kW universal-input front-end for programmable logic controller (PLC) power system operating from 85–264 VAC. IC Role / Device Role / Timing Role: UCC3819APW acts as the primary PFC controller, shaping input current to match voltage waveform and regulating 385-VDC bus with tracking boost. Use Value: Enables EN 61000-3-2 Class A compliance, reduces input filter size by 30%, and lowers MOSFET junction temperature by 12°C vs. fixed-output PFC. |
Use Scenario: 3 kW distributed power architecture (DPA) rectifier for 48-V telecom shelf with hot-swap capability. IC Role / Device Role / Timing Role: UCC3819APW controls interleaved boost stage, synchronizing with downstream PWM via external clock injection on CT pin. Use Value: Supports 94% peak efficiency at full load; tracking boost reduces boost inductor DCR loss by 22% and improves hold-up time margin. |
| Medical Imaging Power Systems | Server PSU Front-Ends |
|
Use Scenario: 2.5 kW X-ray generator power supply requiring low EMI and high reliability under 100% load for 10+ years. IC Role / Device Role / Timing Role: UCC3819APW implements average current mode control with feed-forward line regulation to maintain THD <5% across line and load. Use Value: Meets IEC 60601-1 leakage and EMC requirements; zero-power comparator prevents false triggering during standby transitions. |
Use Scenario: 1.5 kW redundant ATX-style server PSU with dual active PFC stages and digital PMBus monitoring. IC Role / Device Role / Timing Role: UCC3819APW manages single-phase boost stage, interfacing with digital controller via OVP/EN for fault reporting and soft-start coordination. Use Value: Enables 80 PLUS Titanium compliance; programmable OVP threshold allows adaptive protection based on downstream converter status. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2819APW | Same pinout and function, but rated for −40°C to +85°C; VREF tolerance tighter (±13 mV vs. ±12 mV); UVLO turn-on at 10.2 V (same), but turn-off at 9.7 V (same). | Required for extended temperature industrial or outdoor deployments; identical tracking boost capability and gate drive strength. | Select UCC2819APW when operating ambient exceeds 70°C or when full industrial temp grade is mandated by system spec. |
| UC3854BDW | SOIC-16 package; average current mode control; no VAI pin; fixed-output only; 1-A peak gate drive; requires external SS pin circuitry. | Lacks tracking boost support; lower gate drive limits MOSFET selection; higher start-up current (300 µA); no integrated OVP window comparator. | Choose UC3854BDW only for cost-sensitive, fixed-output designs where temperature range is 0°C–70°C and board space allows larger gate resistors. |
Compared with UCC3819APW, UCC2819APW offers identical functionality with extended temperature rating, while UC3854BDW lacks VAI-based tracking, has reduced drive strength, and requires more external components for soft-start and OVP-making UCC3819APW superior for compact, high-efficiency, adaptive-output PFC designs.
Availability
UCC3819APW is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, telecom rectifier modules, and medical imaging systems requiring stable component supply and long-term production continuity.
Supply support for UCC3819APW 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 UCC3819APW belongs to TI's BiCMOS PFC controller product line, engineered specifically for high-efficiency, low-distortion active power factor correction in universal-input AC/DC front-ends up to 2 kW.
FAQ
What is the primary function of the VAI pin on the UCC3819APW?
The VAI pin on the UCC3819APW is the voltage amplifier's non-inverting input, made externally accessible to enable programmable output voltage-most commonly used in tracking boost configurations where it connects to VFF. This allows the regulated output voltage to scale with RMS line voltage, reducing component stress and improving efficiency across wide input ranges. Unlike earlier UCC3818, the UCC3819APW replaces the SS pin with VAI to support this feature directly.
Does the UCC3819APW support synchronization with an external clock signal?
Yes, the UCC3819APW supports external synchronization via the CT pin: applying a TTL-compatible clock signal to CT overrides the internal oscillator and locks the switching frequency to the external source. This capability is documented in TI Application Note SLUA245 and enables phase alignment in multiphase or interleaved PFC systems, reducing input/output ripple and improving thermal distribution across parallel stages.
What is the maximum recommended value for the IAC input current on the UCC3819APW?
The maximum recommended IAC input current for the UCC3819APW is 500 µA, as specified in the Electrical Characteristics table and confirmed in the Pin Descriptions section. Exceeding this value may degrade line-voltage feed-forward accuracy and increase total harmonic distortion (THD). At 500 µA, the multiplier maintains optimal gain linearity and low distortion performance across temperature and line conditions.
How does the UCC3819APW implement over-voltage protection?
The UCC3819APW implements over-voltage protection using the OVP/EN pin as a window comparator: it disables DRVOUT when the voltage exceeds VREF + 0.50 V (±20 mV), with 500-mV hysteresis to prevent oscillation. If the pin voltage drops below 1.9 V (typical), it also resets the soft-start function and disables the PFC output entirely-providing dual-level protection for boost output regulation and system safety.
Is the UCC3819APW pin-compatible with the UCC3819AD in SOIC-16 package?
Yes, the UCC3819APW is pin-for-pin compatible with the UCC3819AD per the datasheet: both share identical pin numbering, electrical functions, and signal definitions across all 16 pins. However, the TSSOP-16 (PW) package has different thermal characteristics (θja = 123–147°C/W) and PCB layout requirements-including tighter trace spacing and mandatory thermal pad grounding recommendations-so mechanical integration must follow PW0016A package outline guidelines.
UCC3819APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Mode:
- Average Current
- Frequency - Switching:
- 250kHz
- Current - Startup:
- 150 µA
- Voltage - Supply:
- 10.8V ~ 17V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
UCC3819APW FAQ
1.How can I place an order for UCC3819APW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3819APW 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 UCC3819APW reliable?
The price and inventory of UCC3819APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3819APW is usually 5 days.
3.What payment methods are accepted for UCC3819APW?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3819APW?
UCC3819APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3819APW 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 UCC3819APW?
For technical support, including UCC3819APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3819APW requirements.
6.How does Aetrix verify that UCC3819APW is sourced from the original manufacturer or authorized distributors?
All UCC3819APW 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 UCC3819APW meets industry standards.
7.What is the process for return or replacement of UCC3819APW?
All UCC3819APW units undergo pre-shipment inspection (PSI). If there is an issue with UCC3819APW, 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 UCC3819APW part is unused and in its original packaging.
Return procedure for UCC3819APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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