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Texas Instruments UCC3819AN
- Part No.:
- UCC3819AN
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UCC3819AN.pdf
- Description:
- IC PFC CTR AV CURR 250KHZ 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,760
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Product details
Overview
UCC3819AN from Texas Instruments is a BiCMOS active power factor correction (PFC) controller IC designed for boost preregulators, delivering near-unity power factor via average current mode control, 10.8–17-V operation, 150-µA typical start-up current, and programmable output voltage via VAI pin - used in AC-DC front-end stages of industrial SMPS and server power supplies.
For engineers reviewing the UCC3819AN datasheet, UCC3819AN pinout, UCC3819AN application, or UCC3819AN equivalent, this page delivers verified technical context, confirmed pin functions, real-world PFC design implications, and validated alternative options for tracking-boost topology implementation.
Technical Context
The UCC3819AN implements average current mode (ACM) control with dual amplifiers: a voltage error amplifier (VAOUT) regulating output voltage and a current amplifier (CAOUT/MOUT) shaping line current to match line voltage waveform. Its analog multiplier accepts IAC current input and VFF feed-forward voltage to generate precise duty-cycle commands.
It features leading-edge PWM modulation, internal 7.5-V reference (±12 mV accuracy), over-voltage protection (OVP/EN window comparator), and zero-power detection (0.33-V threshold on VAOUT). The gate driver delivers ±1.2-A peak current with 9-Ω pull-up and 4-Ω pull-down resistance, optimized for MOSFET switching in high-efficiency PFC stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Control Method | Average current mode (ACM) - enables low-distortion sinusoidal line current with stable loop response. |
| Supply Voltage Range | 10.8 V to 17 V - supports wide-input bias supply; UVLO turn-on at 10.2 V (typ), hysteresis 0.5 V. |
| Oscillator Frequency | 80–120 kHz - set by RT/CT network; initial accuracy ±15% at 25°C; ramp peak 5 V (typ). |
| Voltage Reference | 7.5 V ±12 mV - stable internal reference capable of sourcing 20 mA; disabled below UVLO. |
| Gate Drive Capability | ±1.2 A peak sink/source - robust totem-pole output with 9 Ω pull-up / 4 Ω pull-down for direct MOSFET drive. |
| Start-Up Current | 150 µA (typ) - enables low-loss auxiliary startup in high-voltage PFC designs. |
| Output Voltage Programming | VIA VAI pin - allows dynamic tracking boost (e.g., VOUT ∝ VLINE²) without external DAC or microcontroller. |
Pinout & Package
Packaged in 16-pin PDIP (N package), the UCC3819AN provides full PFC controller functionality with dedicated pins for current sensing (CAI, PKLMT), voltage feedback (VSENSE, VAI), feed-forward (VFF), oscillator timing (RT, CT), gate drive (DRVOUT), and protection (OVP/EN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Reference ground | Common return for all analog and power circuits; bypass VCC/VREF directly to this pin. |
| PKLMT (Pin 2) | Peak current limit input | Threshold = 0 V; connects to current-sense resistor divider to set instantaneous PFC switch current limit. |
| CAOUT (Pin 3) | Current amplifier output | Drives PWM latch; compensation network placed between CAOUT and MOUT for loop stability. |
| CAI (Pin 4) | Current amplifier non-inverting input | Connects 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 output and CA−; enables differential current sensing. |
| IAC (Pin 6) | Line voltage proportional current input | Accepts up to 500 µA current representing RMS line voltage; key input to analog multiplier. |
| 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 | Generated by mirroring IAC through external RC filter; scales with line voltage to maintain constant power gain. |
| VREF (Pin 9) | 7.5-V reference output | Stable 20-mA-capable reference; used for biasing, scaling, and as VAI source in tracking configurations. |
| OVP/EN (Pin 10) | Over-voltage/enable input | Window comparator: disables DRVOUT if boost exceeds programmed level; also acts as enable/disable threshold (1.9 V typ). |
| VSENSE (Pin 11) | Voltage amplifier inverting input | Connects to resistive divider from boost output; sets regulated output voltage via feedback ratio. |
| RT (Pin 12) | Oscillator charging current input | Resistor to GND programs oscillator frequency; nominal voltage ≈ 3 V; recommended range 10–100 kΩ. |
| VAI (Pin 13) | Voltage amplifier non-inverting input | Externally accessible - enables programmable output voltage (e.g., tied to VFF for tracking boost). |
| CT (Pin 14) | Oscillator timing capacitor | Capacitor to GND sets switching frequency per f ≈ 0.6/(RT × CT); requires short, low-inductance trace. |
| VCC (Pin 15) | Positive supply input | Requires ≥20 mA supply; bypassed to GND with ≥0.1-µF ceramic capacitor; inhibits DRVOUT below UVLO. |
| DRVOUT (Pin 16) | Gate drive output | Totem-pole MOSFET driver; rise/fall times ≤50 ns (CL = 1 nF); series gate resistor recommended for damping. |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Enables low THD (<5%) line current with inherent stability and immunity to subharmonic oscillation. |
| Programmable output voltage via VAI | Supports tracking boost topologies where VOUT scales with VLINE², reducing inductor size and conduction losses. |
| Leading-edge PWM modulation | Reduces bulk capacitor ripple current vs. trailing-edge schemes, lowering ESR heating and capacitor stress. |
| Low 150-µA start-up current | Minimizes auxiliary supply losses during cold-start, improving system efficiency at light load and standby. |
| Integrated over-voltage protection | Dual-function OVP/EN pin provides fast shutdown if boost rail exceeds safe threshold, protecting downstream converters. |
| Improved noise immunity | Differential current sensing (CAI/MOUT), feed-forward compensation (VFF), and internal filtering suppress EMI-induced errors. |
Applications
| Server Power Supply Front-End | Industrial AC-DC Converters |
|---|---|
|
Use Scenario: 1–3 kW telecom/server PSUs requiring >98% efficiency and EN 61000-3-2 Class C compliance. IC Role / Device Role / Timing Role: Primary PFC controller managing boost stage; regulates output voltage while shaping input current waveform in real time. Use Value: Enables near-unity power factor (≥0.99) and <5% THD across universal AC input (85–265 VAC), meeting strict regulatory limits. |
Use Scenario: Motor drives, PLC power modules, and factory automation systems operating in harsh environments. IC Role / Device Role / Timing Role: Standalone PFC controller in two-stage conversion; interfaces with isolated DC-DC stage via regulated 380–400 V bus. Use Value: Delivers stable high-voltage bus under wide line/load variations, with OVP/EN ensuring safe shutdown during fault conditions. |
| LED Driver Input Stage | Medical Equipment Power Modules |
|
Use Scenario: High-bay LED luminaires and outdoor lighting systems with universal AC input and long lifetime requirements. IC Role / Device Role / Timing Role: Boost PFC controller setting regulated DC bus for downstream constant-current LED drivers. Use Value: Reduces input current stress and improves thermal performance via tracking boost (lower VOUT at low line), extending electrolytic capacitor life. |
Use Scenario: Diagnostic imaging equipment and patient monitors requiring ultra-low EMI and high reliability. IC Role / Device Role / Timing Role: Critical front-end PFC controller ensuring clean, regulated input to isolated DC-DC converters powering sensitive analog circuitry. Use Value: Low-noise design (differential sensing, feed-forward) minimizes conducted emissions; UVLO/OVP ensures fail-safe behavior during brownouts or surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC3819AD | Same die, SOIC-16 package; higher thermal resistance (θja = 40–70°C/W vs. PDIP's 25–50°C/W); no lead-free exemption noted. | Preferred for surface-mount assembly; less suitable for high-ambient or thermally constrained through-hole designs. | Select UCC3819AD only when board space or automated assembly mandates SOIC packaging. |
| UCC2819AN | Same pinout and function but rated for −40°C to +85°C (vs. UCC3819AN's 0°C to +70°C); tighter VREF tolerance (±13 mV vs. ±12 mV). | Required for extended temperature industrial or outdoor deployments; otherwise electrically identical in standard environments. | Choose UCC2819AN when operating ambient exceeds 70°C or when automotive-adjacent qualification is needed. |
Compared with UCC3819AD and UCC2819AN, the UCC3819AN offers optimal thermal performance in through-hole layouts and cost-effective qualification for commercial-temperature industrial PFC designs, balancing manufacturability, reliability, and thermal headroom.
Availability
UCC3819AN is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC converters, LED driver front-ends, and medical equipment power modules requiring stable component supply and long-term production continuity.
Supply support for UCC3819AN 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 ICs.
The UCC3819AN belongs to TI's BiCMOS PFC controller product line, engineered specifically for high-efficiency, low-THD active power factor correction in universal-input AC-DC power supplies.
FAQ
What is the operating temperature range of the UCC3819AN?
The UCC3819AN is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade rating makes it suitable for indoor industrial equipment, server power supplies, and consumer-grade high-power electronics where ambient conditions remain within this envelope. The UCC3819AN does not support extended temperature ranges - for −40°C to +85°C operation, the UCC2819AN is the qualified alternative. Thermal derating guidelines apply above 50°C ambient depending on PCB layout and airflow.
How does the VAI pin enable tracking boost functionality in the UCC3819AN?
The VAI pin on the UCC3819AN exposes the non-inverting input of the internal voltage error amplifier, allowing direct connection to a scaled version of the line voltage (e.g., via VFF or an external RMS-to-DC circuit). When VAI tracks VLINE, the regulated output voltage (VOUT) scales proportionally - for example, from ~350 V at 230 VAC to ~270 V at 115 VAC. This reduces boost inductor size, MOSFET conduction losses, and bulk capacitor stress. The UCC3819AN's VAI capability is absent in earlier UCC3818 variants.
What are the absolute maximum ratings for the DRVOUT pin of the UCC3819AN?
The DRVOUT pin of the UCC3819AN has an absolute maximum gate drive current rating of ±1.2 A peak and a continuous current limit of 0.2 A. It must not be subjected to voltages beyond the supply rails - specifically, no more than −0.5 V below GND. Exceeding these limits risks permanent damage to the totem-pole output stage. For reliable operation, a series gate resistor (typically 10–22 Ω) is recommended to damp ringing and limit peak current into capacitive MOSFET gates.
Does the UCC3819AN support pin-to-pin replacement with the UCC3819A?
Yes - the UCC3819AN is pin-for-pin compatible with the UCC3819A, sharing identical pinout, electrical specifications, and functional behavior. The sole difference is mechanical: UCC3819AN uses a PDIP-16 package, while UCC3819A refers generically to the part number family (including SOIC and TSSOP variants). No PCB changes are required when substituting UCC3819AN for UCC3819AD or UCC3819APW in existing designs, though thermal and mounting considerations differ by package type.
What is the purpose of the PKLMT pin on the UCC3819AN, and how is it configured?
The PKLMT pin on the UCC3819AN serves as the peak current limit threshold input, referenced to 0 V. It is configured using a resistor divider from the negative side of the current-sense resistor to VREF (7.5 V), generating a voltage that crosses 0 V when sensed current reaches the desired limit. Because PKLMT is a high-impedance input, the divider can use high-value resistors (e.g., 100 kΩ + 10 kΩ) to minimize power loss. This scheme allows precise, temperature-stable current limiting independent of VCC or load conditions - a core feature of the UCC3819AN's robust PFC control.
UCC3819AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
UCC3819AN FAQ
1.How can I place an order for UCC3819AN through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3819AN 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 UCC3819AN reliable?
The price and inventory of UCC3819AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3819AN is usually 5 days.
3.What payment methods are accepted for UCC3819AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3819AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3819AN?
UCC3819AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3819AN 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 UCC3819AN?
For technical support, including UCC3819AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3819AN requirements.
6.How does Aetrix verify that UCC3819AN is sourced from the original manufacturer or authorized distributors?
All UCC3819AN 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 UCC3819AN meets industry standards.
7.What is the process for return or replacement of UCC3819AN?
All UCC3819AN units undergo pre-shipment inspection (PSI). If there is an issue with UCC3819AN, 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 UCC3819AN part is unused and in its original packaging.
Return procedure for UCC3819AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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