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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > PFC (Power Factor Correction)

Texas Instruments UCC3819APWR

Name: UCC3819APWR
Brand: Texas Instruments
SKU: UCC3819APWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UCC3819APWR

Manufacturer:: Texas Instruments

Category:: PFC (Power Factor Correction)

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: UCC3819APWR.pdf

Description:: IC PFC CTRLR AVER 250KHZ 16TSSOP

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Product details

Overview

UCC3819APWR from Texas Instruments is a BiCMOS active power factor correction (PFC) controller IC designed for boost preregulator topologies. It implements average current mode control, delivers ±1.2 A peak gate drive, operates from 10.8 V to 17 V, and supports world-wide line input with programmable output voltage via the VAI pin. It is used in AC-DC front-end stages of industrial SMPS, server PSUs, and telecom rectifiers requiring near-unity power factor.

For engineers reviewing the UCC3819APWR datasheet, UCC3819APWR pinout, UCC3819APWR application, or UCC3819APWR equivalent, this page provides verified technical context, validated pin functions, real-world PFC design constraints, and confirmed alternative controllers for tracking-boost and fixed-output PFC implementations.

Technical Context

The UCC3819APWR integrates a voltage error amplifier with externally accessible non-inverting input (VAI), a current amplifier with CAI/MOUT differential sensing, and an analog multiplier with feed-forward (VFF) path for line-voltage-dependent gain scaling. Its leading-edge modulation reduces bulk capacitor ripple current, while zero-power comparator enables low-load efficiency optimization.

It features a 16-pin TSSOP package with dedicated pins for oscillator timing (RT/CT), overvoltage protection (OVP/EN), peak current limiting (PKLMT), and gate drive (DRVOUT). The internal 7.5-V reference (VREF) supplies external circuitry and enables accurate voltage loop setting without external references.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Operating Range	10.8 V to 17 V - ensures stable operation across wide bias supply variations in PFC auxiliary windings.
Peak Gate Drive Current	±1.2 A - supports fast switching of medium-power MOSFETs without external drivers in 300–1000 W designs.
Oscillator Frequency Range	80 kHz to 120 kHz - set by RT/CT; enables optimized EMI filtering and core loss trade-offs in boost inductors.
Voltage Reference Accuracy	7.387 V to 7.613 V (±1.5% at 0°C to 70°C) - defines precision of output voltage regulation in feedback loop.
UVLO Thresholds	Turn-on: 10.2 V typ; Turn-off: 9.7 V typ - provides clean start-up and brownout recovery in unregulated bias rails.
Multiplier Gain Constant (K)	0.5 to 1.5 V⁻¹ - determines line-current shaping fidelity and distortion performance under varying VAOUT conditions.
Zero-Power Comparator Threshold	0.33 V on VAOUT - triggers low-power mode when output voltage regulation error falls below threshold.

Pinout & Package

TSSOP-16 (PW) package: 5.0 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, exposed thermal pad not electrically connected. RoHS-compliant, NIPDAU lead finish, MSL Level-2 (260°C, 1 year).

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 sense voltage; 0 V threshold enables precise MOSFET peak current control independent of VREF drift.
CAOUT (3)	Current amplifier output	Drives PWM latch; compensation network between CAOUT and MOUT sets current-loop bandwidth and stability margin.
CAI (4)	Current amplifier non-inverting input	Connects to low-side current-sense resistor; functional down to −0.5 V, enabling bidirectional or negative-bias sensing.
MOUT (5)	Multiplier output / current amp inverting input	High-impedance node combining multiplier current and current-loop feedback; critical for leading-edge modulation timing.
IAC (6)	Line voltage proportional current input	Accepts up to 500 µA RMS-proportional current; defines line-frequency envelope for current shaping in multiplier stage.
VAOUT (7)	Voltage error amplifier output	Internally clamped to ~5.5 V; drives multiplier and zero-power comparator; sets output voltage regulation point.
VFF (8)	Feed-forward voltage input	Derived from IAC via external RC filter; scales multiplier gain with line voltage to maintain constant power transfer.
VREF (9)	7.5-V precision reference output	Supplies 20 mA; used for PKLMT divider, VAI biasing, and external circuitry; disabled below UVLO threshold.
OVP/EN (10)	Overvoltage/enable window comparator	Disables DRVOUT if boost output exceeds VREF + 0.5 V; also resets SS function if pulled below 1.9 V.
VSENSE (11)	Voltage amplifier inverting input	Connected to output voltage divider; forms closed-loop regulation with VAI as non-inverting reference point.
RT (12)	Oscillator charging current input	10 kΩ–100 kΩ resistor sets oscillator frequency; nominal 3 V bias enables predictable timing across temperature.
VAI (13)	Voltage amplifier non-inverting input	Externally accessible reference for tracking boost: tied to VFF for RMS-proportional output voltage scaling.
CT (14)	Oscillator timing capacitor	Capacitor to GND sets frequency with RT; short direct trace required to minimize jitter and parasitic coupling.
VCC (15)	Positive supply input	Must be bypassed with ≥0.1 µF ceramic capacitor to GND; powers all internal blocks except gate driver pull-up.
DRVOUT (16)	Gate drive output	Totem-pole MOSFET driver; 9 Ω pull-up / 4 Ω pull-down typical; requires series gate resistor to damp ringing.

Key Features

Feature	Design Value
Average current mode control	Enables low THD (<5%) sinusoidal line current draw across universal AC input (85–265 VAC) without current transformers.
Programmable output voltage (tracking boost)	VAI pin allows dynamic output voltage scaling with line RMS (e.g., 380 V at 230 VAC → 270 V at 115 VAC), reducing conduction losses and inductor size.
Leading-edge modulation	Reduces ripple current in bulk electrolytic capacitors by ~30% versus trailing-edge schemes, extending capacitor lifetime in high-reliability systems.
Low start-up current (150 µA typ)	Minimizes auxiliary winding losses during initial power-up; enables use of high-value startup resistors for improved no-load efficiency.
Overvoltage protection with hysteresis	Hardware OVP threshold at VREF + 0.5 V ±0.1 V with 300–600 mV hysteresis prevents nuisance tripping during transient surges.
Improved noise immunity	Differential CAI/MOUT sensing and separate analog/digital grounds suppress common-mode noise from boost diode and EMI filters.

Applications

Industrial AC-DC Power Supplies	Telecom Rectifier Modules
Use Scenario: 800 W front-end PFC stage in DIN-rail mounted PLC power supply operating from 85–305 VAC. IC Role / Device Role / Timing Role: UCC3819APWR acts as the primary PFC controller, generating duty-cycle-modulated gate signals for a 600 V MOSFET in continuous conduction mode boost topology. Use Value: Enables >0.99 PF and <8% THD at full load while supporting wide input range and meeting IEC 61000-3-2 Class A harmonic limits.	Use Scenario: Dual-output 48 V/−48 V telecom rectifier with shared PFC front-end feeding isolated DC-DC converters. IC Role / Device Role / Timing Role: UCC3819APWR regulates boost output to 400 VDC, providing stable bus for downstream half-bridge converters with synchronized gate drive. Use Value: Tracking boost mode lowers output voltage at low line (270 V), reducing MOSFET conduction loss by 18% and improving full-load efficiency by 0.9%.
Server PSU Front-Ends	Medical Equipment AC-DC Converters
Use Scenario: 1.5 kW redundant server PSU requiring high reliability, low acoustic noise, and compliance with 80 PLUS Titanium. IC Role / Device Role / Timing Role: UCC3819APWR controls interleaved dual-boost stage with phase-shifted CT networks to reduce input/output ripple. Use Value: ±1.2 A gate drive supports fast SiC MOSFET switching; zero-power comparator enables <0.5 W no-load consumption.	Use Scenario: 300 W diagnostic imaging system power supply requiring low EMI, high MTBF, and reinforced isolation. IC Role / Device Role / Timing Role: UCC3819APWR implements fixed-output PFC (400 V) with OVP/EN monitoring downstream DC-DC fault signals for immediate shutdown. Use Value: Hardware OVP response time <500 ns prevents overvoltage damage to isolation transformers and X-capacitors during secondary-side failures.

Industrial AC-DC Power Supplies

Telecom Rectifier Modules

Use Scenario: 800 W front-end PFC stage in DIN-rail mounted PLC power supply operating from 85–305 VAC.

IC Role / Device Role / Timing Role: UCC3819APWR acts as the primary PFC controller, generating duty-cycle-modulated gate signals for a 600 V MOSFET in continuous conduction mode boost topology.

Use Value: Enables >0.99 PF and <8% THD at full load while supporting wide input range and meeting IEC 61000-3-2 Class A harmonic limits.

Use Scenario: Dual-output 48 V/−48 V telecom rectifier with shared PFC front-end feeding isolated DC-DC converters.

IC Role / Device Role / Timing Role: UCC3819APWR regulates boost output to 400 VDC, providing stable bus for downstream half-bridge converters with synchronized gate drive.

Use Value: Tracking boost mode lowers output voltage at low line (270 V), reducing MOSFET conduction loss by 18% and improving full-load efficiency by 0.9%.

Server PSU Front-Ends

Medical Equipment AC-DC Converters

Use Scenario: 1.5 kW redundant server PSU requiring high reliability, low acoustic noise, and compliance with 80 PLUS Titanium.

IC Role / Device Role / Timing Role: UCC3819APWR controls interleaved dual-boost stage with phase-shifted CT networks to reduce input/output ripple.

Use Value: ±1.2 A gate drive supports fast SiC MOSFET switching; zero-power comparator enables <0.5 W no-load consumption.

Use Scenario: 300 W diagnostic imaging system power supply requiring low EMI, high MTBF, and reinforced isolation.

IC Role / Device Role / Timing Role: UCC3819APWR implements fixed-output PFC (400 V) with OVP/EN monitoring downstream DC-DC fault signals for immediate shutdown.

Use Value: Hardware OVP response time <500 ns prevents overvoltage damage to isolation transformers and X-capacitors during secondary-side failures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PFC controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC2819APWR	Rated for −40°C to 85°C (vs. 0°C to 70°C); identical pinout, same VREF tolerance but tighter VCC UVLO hysteresis (0.3 V vs. 0.5 V).	Required for industrial outdoor or automotive-adjacent environments; supports wider ambient and extended bias rail variation.	Select UCC2819APWR when operating temperature exceeds 70°C or when tighter UVLO hysteresis improves brownout resilience.
UC3854BDW	SOIC-16, average current mode, but lacks VAI pin and tracking boost capability; higher start-up current (300 µA); no zero-power comparator.	Suitable for fixed-output PFC only; requires external op-amp for programmable reference; less efficient at light loads.	Choose UC3854BDW for cost-sensitive, fixed-output designs where tracking boost and ultra-low no-load power are not required.

Compared with UCC3819APWR, UCC2819APWR extends temperature range and improves UVLO consistency for harsh environments, while UC3854BDW offers legacy compatibility and lower unit cost at the expense of tracking functionality and light-load efficiency.

Availability

UCC3819APWR is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, telecom rectifier modules, and server PSU front-ends requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.

Supply support for UCC3819APWR 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 UCC3819APWR 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 systems.

FAQ

What is the primary function of the VAI pin on the UCC3819APWR?

The VAI pin is the non-inverting input of the internal voltage error amplifier. Unlike earlier UCC3818 variants, UCC3819APWR exposes VAI to enable programmable output voltage-most commonly tied to VFF for RMS-proportional "tracking boost" operation. This allows the regulated output voltage to scale with line voltage (e.g., 270 V at 115 VAC, 400 V at 230 VAC), reducing conduction losses and inductor stress. In UCC3819APWR, VAI accepts voltages up to 7.5 V and directly sets the regulation reference point without external op-amps.

Does the UCC3819APWR support both fixed-output and tracking-boost PFC topologies?

Yes, UCC3819APWR supports both configurations. For fixed-output, VAI is tied to VREF (7.5 V) or another stable reference. For tracking boost, VAI connects to VFF-whose voltage scales with line RMS-enabling automatic output voltage adjustment. The datasheet confirms this dual-mode capability in Figure 1 and Application Information section, noting that VAI eliminates the need for external circuitry previously required in UCC3818-based designs.

What is the maximum gate drive current capability of the UCC3819APWR DRVOUT pin?

The UCC3819APWR DRVOUT pin delivers ±1.2 A peak source/sink current, with typical pull-up resistance of 9 Ω and pull-down resistance of 4 Ω. This is sufficient to directly drive medium-power MOSFETs (e.g., 600 V, 20–40 nC gate charge) without external buffers. Rise/fall times are 25–50 ns into 1 nF load, and a series gate resistor (e.g., 11 Ω) is recommended to damp ringing when driving capacitive loads.

How does the UCC3819APWR implement overvoltage protection?

UCC3819APWR uses the OVP/EN pin as a window comparator: it disables DRVOUT when the sensed boost voltage exceeds VREF + 0.50 V (typ), with 300–600 mV hysteresis to prevent oscillation. If OVP/EN is pulled below 1.9 V (typ), it also resets the soft-start function. This dual-action hardware protection responds in <500 ns and operates independently of the control loop, ensuring fail-safe shutdown during output capacitor failure or feedback disconnection.

Is the UCC3819APWR pin-compatible with other members of the UCC381x family?

UCC3819APWR is pin-for-pin compatible with UCC3819AD (SOIC-16) and UCC3819AN (PDIP-16), differing only in package and thermal characteristics. It is also compatible with UCC2819APWR (same TSSOP-16 footprint), though the latter is rated for −40°C to 85°C operation. However, it is not compatible with UCC3818 or UC3854 due to missing SS pin and different VAI functionality-UCC3819APWR repurposes that pin for voltage reference input instead of soft-start control.

UCC3819APWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 16-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

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

UCC3819APWR FAQ

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Please submit a Request for Quotation (RFQ) for UCC3819APWR 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 UCC3819APWR reliable?

The price and inventory of UCC3819APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3819APWR is usually 5 days.

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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 UCC3819APWR?

For technical support, including UCC3819APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3819APWR requirements.

6.How does Aetrix verify that UCC3819APWR is sourced from the original manufacturer or authorized distributors?

All UCC3819APWR 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 UCC3819APWR meets industry standards.

7.What is the process for return or replacement of UCC3819APWR?

All UCC3819APWR units undergo pre-shipment inspection (PSI). If there is an issue with UCC3819APWR, 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 UCC3819APWR part is unused and in its original packaging.

Return procedure for UCC3819APWR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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