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Texas Instruments UCC3819ADR
- Part No.:
- UCC3819ADR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC3819ADR.pdf
- Description:
- IC PFC CTR AVERAGE 250KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
UCC3819ADR 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 supply, features programmable output voltage via VAI pin, and enables near-unity power factor in AC-DC front-end supplies for industrial and computing power systems.
For engineers reviewing the UCC3819ADR datasheet, UCC3819ADR pinout, UCC3819ADR application, or UCC3819ADR equivalent, this page provides verified technical context, confirmed pin functions, real-world PFC design constraints (e.g., 150 µA start-up current, 7.5 V reference accuracy, leading-edge modulation), and validated alternative options for tracking-boost PFC implementations.
Technical Context
The UCC3819ADR integrates a voltage error amplifier with externally accessible non-inverting input (VAI), a current amplifier with CAI/MOUT differential sensing, an analog multiplier with IAC/VFF feed-forward inputs, and a totem-pole gate driver delivering ±1.2 A peak current. Its oscillator uses RT/CT programming for 80–120 kHz operation, and zero-power comparator triggers at 0.33 V on VAOUT.
It supports tracking boost topology by connecting VAI to VFF, enabling line-voltage-scaled output regulation - reducing inductor size and MOSFET conduction losses at low-line conditions. Over-voltage protection (OVP/EN) disables DRVOUT when boost output exceeds VREF + 0.5 V, with 300–600 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 10.8 V to 17 V - ensures stable operation across wide bias rail variations in offline PFC stages |
| Gate Drive Peak Current | ±1.2 A - drives high-side MOSFETs directly with minimal external buffering in boost switch applications |
| Reference Voltage | 7.5 V ±12 mV - precision internal reference used for OVP threshold and VAI-based output programming |
| Oscillator Frequency Range | 80 kHz to 120 kHz - set by RT/CT; enables optimized EMI filtering and magnetics sizing for 50/60 Hz mains |
| Start-Up Current | 150 µA typical - minimizes auxiliary supply loading during initial power-up of PFC stage |
| UVLO Threshold | 10.2 V turn-on / 9.7 V turn-off - provides clean power sequencing and brown-out immunity |
| Zero-Power Comparator Threshold | 0.33 V - enables accurate detection of near-zero load condition to reduce standby losses |
Pinout & Package
UCC3819ADR is packaged in a 16-pin SOIC (D) package with 1.27 mm pitch, 10.3 mm × 6.5 mm body, and RoHS-compliant NIPDAU lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all internal analog and power circuits; must be low-impedance connection to PCB ground plane |
| PKLMT (Pin 2) | Peak current limit input | Accepts voltage-referenced signal from current-sense resistor divider; triggers shutdown when voltage falls below 0 V |
| CAOUT (Pin 3) | Current amplifier output | Drives PWM latch; connects to MOUT for compensation network placement and noise-immune current loop closure |
| CAI (Pin 4) | Current amplifier non-inverting input | Connects to GND side of current-sense resistor; supports operation down to and below ground potential |
| MOUT (Pin 5) | Multiplier output / CA inverting input | High-impedance node combining multiplier current and CA feedback; enables leading-edge modulation and differential sensing |
| IAC (Pin 6) | Line voltage proportional current input | Accepts up to 500 µA RMS-proportional current for distortion-free feed-forward scaling of PFC gain |
| VAOUT (Pin 7) | Voltage amplifier output | Regulates boost output voltage; internally clamped to ~5.5 V to prevent overshoot during transients |
| VFF (Pin 8) | Feed-forward voltage | Provides RMS-scaled voltage derived from IAC; used with VAI to implement line-tracking output voltage |
| VREF (Pin 9) | 7.5 V reference output | Stable 20 mA-capable reference for OVP, PKLMT divider, and external circuitry; disabled below UVLO |
| OVP/EN (Pin 10) | Over-voltage / enable input | Window comparator input: disables DRVOUT above VREF+0.5 V or resets control if pulled below 1.9 V |
| VSENSE (Pin 11) | Voltage amplifier inverting input | Connects to output voltage divider; forms feedback loop with VAOUT for closed-loop output regulation |
| RT (Pin 12) | Oscillator timing current input | Sets charging current for CT capacitor; 10 kΩ–100 kΩ resistor recommended for 80–120 kHz frequency range |
| VAI (Pin 13) | Voltage amplifier non-inverting input | Externally accessible reference point - tied to VFF for tracking boost or to fixed reference for constant output |
| CT (Pin 14) | Oscillator timing capacitor | Connects to GND; sets switching frequency with RT per f ≈ 0.6/(RT × CT); requires short, direct trace |
| VCC (Pin 15) | Positive supply input | Requires ≥20 mA capability and local 0.1 µF ceramic bypass to GND; inhibits DRVOUT until UVLO threshold is met |
| DRVOUT (Pin 16) | Gate drive output | Totem-pole driver for external MOSFET; recommends series gate resistor (e.g., 11 Ω) to damp ringing with capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Enables stable, low-distortion sinusoidal line current shaping for >0.99 power factor across universal AC input |
| Programmable output voltage via VAI | Allows dynamic output scaling (e.g., VAI = VFF) to reduce boost inductor size and MOSFET stress at low-line conditions |
| Leading-edge modulation | Reduces ripple current in bulk capacitor and improves transient response compared to trailing-edge schemes |
| 150 µA typical start-up current | Minimizes auxiliary supply burden during cold start, enabling smaller bias windings or startup resistors |
| Over-voltage protection with hysteresis | Shuts down DRVOUT when boost output exceeds VREF + 0.5 V (±100 mV hysteresis), protecting downstream converters |
| Improved noise immunity | Differential CAI/MOUT sensing and dedicated IAC current input reject common-mode noise in high-dV/dt PFC environments |
Applications
| Server Power Supply Front-End | Industrial AC-DC Rectifier |
|---|---|
Use Scenario: 1 kW+ ATX or redundant server PSU requiring >98% efficiency and EN61000-3-2 compliance. IC Role / Device Role / Timing Role: Primary PFC controller managing boost switch duty cycle, line current shaping, and output voltage regulation. Use Value: Enables tracking boost operation (via VAI–VFF tie) to maintain optimal inductor utilization and reduce conduction losses across 90–264 VAC input range. |
Use Scenario: Factory automation power module with wide input range and high reliability requirements. IC Role / Device Role / Timing Role: Active PFC controller ensuring stable DC bus generation under fluctuating grid conditions and harmonic distortion limits. Use Value: Delivers 150 µA start-up current and robust UVLO (10.2 V/9.7 V) for reliable cold-start performance in unregulated industrial mains environments. |
| Medical Equipment Power System | Telecom Rectifier Shelf |
Use Scenario: UL60601-certified diagnostic imaging system requiring low standby loss and precise OVP. IC Role / Device Role / Timing Role: PFC controller implementing zero-power detection (0.33 V threshold) and fast OVP response to protect sensitive downstream loads. Use Value: Integrates accurate 7.5 V reference (±12 mV) and 300–600 mV OVP hysteresis to meet stringent safety margin requirements for medical isolation barriers. |
Use Scenario: -48 V telecom rectifier with hot-swap capability and strict THD limits per GR-1089. IC Role / Device Role / Timing Role: Average current mode PFC controller synchronizing line current waveform to voltage with <5% THD at full load. Use Value: Uses IAC current input and VFF feed-forward to maintain low distortion across 40–70 Hz input frequency variation typical in generator-backed sites. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2819ADR | Same pinout and architecture; rated for −40°C to 85°C industrial temperature range vs. UCC3819ADR's 0°C to 70°C | Required for extended ambient operation in outdoor or uncooled enclosures | Select UCC2819ADR when operating temperature exceeds 70°C or when long-term industrial qualification is mandated |
| UC3854BDW | SOIC-16, average current mode, but lacks VAI pin and tracking boost capability; higher 2.5 mA operating current | Suitable for fixed-output PFC only; no line-voltage-scaled regulation | Choose UC3854BDW for cost-sensitive, fixed-output designs where VAI functionality is unnecessary and thermal headroom allows higher quiescent draw |
Compared with UCC3819ADR, UCC2819ADR extends temperature range without altering pinout or control behavior, while UC3854BDW offers legacy compatibility but omits programmable output voltage and zero-power detection - making UCC3819ADR uniquely suited for adaptive, low-loss tracking boost PFC designs.
Availability
UCC3819ADR is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC rectifiers, medical equipment power systems, telecom rectifier shelves, and embedded computing front-ends requiring stable component supply and long-lifecycle support.
Supply support for UCC3819ADR 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 over 50 years of innovation in power conversion ICs.
The UCC3819ADR 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 power supplies.
FAQ
What is the operating temperature range for the UCC3819ADR?
The UCC3819ADR is specified for operation from 0°C to 70°C ambient temperature. This rating applies to the SOIC (D) package variant with R-suffix tape-and-reel ordering. For extended temperature operation down to −40°C, the functionally identical UCC2819ADR should be selected instead, as confirmed in TI's official packaging addendum and electrical characteristics tables.
Does the UCC3819ADR support tracking boost topology?
Yes, the UCC3819ADR explicitly supports tracking boost topology through its dedicated VAI (voltage amplifier non-inverting input) pin. As documented in the SLUS579 datasheet Application Information section, tying VAI to VFF enables output voltage scaling with line voltage - reducing boost inductor size and MOSFET conduction losses at low-line conditions without compromising regulation accuracy.
What is the purpose of the PKLMT pin on the UCC3819ADR?
The PKLMT (peak current limit) pin on the UCC3819ADR serves as the threshold input for cycle-by-cycle current limiting in the boost switch. When the voltage at PKLMT falls below 0 V - typically achieved using a resistor divider from the negative side of the current-sense resistor to VREF - the controller terminates the current pulse to prevent MOSFET overcurrent. This is a core safety feature confirmed in the Pin Descriptions section of SLUS579.
Can the UCC3819ADR be used as a direct replacement for the UCC3819AD?
Yes, the UCC3819ADR is a tape-and-reel variant of the UCC3819AD - identical in electrical specification, pinout, and thermal characteristics. The "R" suffix denotes packaging only: 2500 units per reel in SOIC-D format. No circuit or layout changes are required when substituting UCC3819ADR for UCC3819AD in production, as verified in TI's PACKAGE OPTION ADDENDUM and ordering row documentation.
What gate drive capability does the UCC3819ADR provide?
The UCC3819ADR provides ±1.2 A peak gate drive current on the DRVOUT pin, with typical pull-up resistance of 9 Ω and pull-down resistance of 4 Ω. This enables direct driving of medium-power MOSFETs in boost configurations. The datasheet recommends adding a series gate resistor (e.g., 11 Ω) to damp ringing when driving capacitive loads - a design requirement confirmed in the DRVOUT pin description and Gate Driver electrical characteristics table.
UCC3819ADR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-SOIC
UCC3819ADR FAQ
1.How can I place an order for UCC3819ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3819ADR 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 UCC3819ADR reliable?
The price and inventory of UCC3819ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3819ADR is usually 5 days.
3.What payment methods are accepted for UCC3819ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3819ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3819ADR?
UCC3819ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3819ADR 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 UCC3819ADR?
For technical support, including UCC3819ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3819ADR requirements.
6.How does Aetrix verify that UCC3819ADR is sourced from the original manufacturer or authorized distributors?
All UCC3819ADR 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 UCC3819ADR meets industry standards.
7.What is the process for return or replacement of UCC3819ADR?
All UCC3819ADR units undergo pre-shipment inspection (PSI). If there is an issue with UCC3819ADR, 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 UCC3819ADR part is unused and in its original packaging.
Return procedure for UCC3819ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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