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Texas Instruments UCC2819AD
- Part No.:
- UCC2819AD
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC2819AD.pdf
- Description:
- IC PFC CTR AVERAGE 250KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,282
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Product details
Overview
UCC2819AD from Texas Instruments is a BiCMOS active power factor correction (PFC) controller IC designed for boost preregulators in AC-DC front-end stages. It implements average current mode control, achieves near-unity power factor across worldwide line voltages (85–265 VAC), supports programmable output voltage via VAI pin, and operates from 10.8 V to 17 V supply with 150 µA typical start-up current.
For engineers reviewing the UCC2819AD datasheet, UCC2819AD pinout, UCC2819AD application, or UCC2819AD equivalent, this page delivers verified technical context, confirmed pin functions, real-world PFC design constraints (e.g., 93–100% max duty cycle, ±1.2 A gate drive), and validated alternatives for industrial and telecom power supplies requiring stable 40–120 kHz switching and −40°C to +85°C operation.
Technical Context
The UCC2819AD integrates a voltage error amplifier with externally accessible non-inverting input (VAI), a current amplifier with CAI/MOUT differential sensing, and an analog multiplier that shapes line current using IAC and VFF inputs. Its leading-edge modulation reduces bulk capacitor ripple, while zero-power comparator (0.33 V threshold on VAOUT) enables low-power disable functionality.
It features programmable oscillator frequency (via RT/CT), over-voltage protection (OVP/EN window comparator with 1.9 V enable threshold), and accurate 7.5 V reference (±13 mV tolerance over −40°C to +85°C). The gate driver delivers ±1.2 A peak current with 9 Ω pull-up and 4 Ω pull-down resistance, optimized for robust MOSFET switching in high-efficiency PFC stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | −40°C to +85°C - qualified for industrial and telecom power supply environments |
| Supply Voltage Range | 10.8 V to 17 V - ensures reliable startup and operation across bias rail variations |
| Reference Voltage | 7.5 V ±13 mV - provides stable feedback reference for voltage loop accuracy |
| Oscillator Frequency | 80–120 kHz - programmable via RT/CT; supports high-efficiency boost inductors |
| Gate Drive Capability | ±1.2 A peak - drives MOSFET gates directly without external buffers in most designs |
| Start-Up Current | 150 µA typical - minimizes auxiliary supply loading during initial power-up |
| Max Duty Cycle | 93% to 100% - accommodates wide input voltage ranges in universal-line applications |
Pinout & Package
UCC2819AD is housed in a 16-pin SOIC (D) package with 1.27 mm pitch, 10.3 mm × 6.5 mm body size, and 1.75 mm max height. Thermal resistance θJA is 40–70°C/W on standard FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return for all internal circuits; bypass VCC/VREF directly to this pin |
| PKLMT (Pin 2) | Peak current limit input | Zero-volt threshold; connects to current-sense resistor divider for precise PFC current limiting |
| CAOUT (Pin 3) | Current amplifier output | Drives PWM latch; compensation network placed between CAOUT and MOUT |
| CAI (Pin 4) | Current amplifier non-inverting input | Connects to GND side of sense resistor; functional down to and below ground |
| MOUT (Pin 5) | Multiplier output / CA inverting input | High-impedance node enabling differential current sensing and leading-edge modulation |
| IAC (Pin 6) | Line voltage proportional current input | Accepts up to 500 µA; primary input for RMS-based feed-forward line regulation |
| VAOUT (Pin 7) | Voltage amplifier output | Internally clamped to ~5.5 V; regulates boost output voltage via VSENSE divider |
| VFF (Pin 8) | Feed-forward voltage | Generated from IAC mirror; sets multiplier gain scaling for line-voltage-dependent current shaping |
| VREF (Pin 9) | 7.5 V reference output | Supplies 20 mA; disabled below UVLO; bypass with ≥0.1 µF ceramic capacitor |
| OVP/EN (Pin 10) | Over-voltage/enable input | Window comparator: disables driver above programmed OVP level or below 1.9 V enable threshold |
| VSENSE (Pin 11) | Voltage amplifier inverting input | Connects to output voltage divider; forms closed-loop regulation with VAI/VAOUT |
| RT (Pin 12) | Oscillator timing current | 10–100 kΩ resistor to GND sets charging current; nominal voltage = 3 V |
| VAI (Pin 13) | Voltage amplifier non-inverting input | Externally accessible for tracking boost output (e.g., tied to VFF for line-voltage scaling) |
| CT (Pin 14) | Oscillator timing capacitor | Capacitor to GND sets frequency: f ≈ 0.6/(RT × CT); short, direct trace required |
| VCC (Pin 15) | Positive supply input | Requires ≥20 mA; bypass directly to GND; inhibited below 9.7 V UVLO turn-on threshold |
| DRVOUT (Pin 16) | Gate driver output | Totem-pole MOSFET driver; use series gate resistor (e.g., 11 Ω) to damp overshoot |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Enables low-distortion sinusoidal line current shaping for >0.99 power factor |
| Programmable output voltage (tracking boost) | VAI pin allows dynamic output scaling with line voltage-reducing inductor size and MOSFET losses at low line |
| Leading-edge modulation | Reduces ripple current in bulk capacitor, lowering ESR stress and improving reliability |
| Improved noise immunity | Differential CAI/MOUT sensing and internal filtering suppress EMI in noisy AC-DC environments |
| Accurate power limiting | PKLMT pin with zero-volt threshold enables precise, temperature-stable peak current control |
Applications
| Server Power Supply Front-End | Industrial AC-DC Converters |
|---|---|
|
Use Scenario: 1 kW+ telecom/server PSU with universal AC input (85–265 VAC) and strict EN61000-3-2 harmonic compliance. IC Role / Device Role / Timing Role: Primary PFC controller implementing average current mode boost preregulator with 100 kHz switching and tracking output voltage. Use Value: Enables >0.99 PF and <5% THD across full line range while reducing boost inductor volume by 30% via VAI-based tracking. |
Use Scenario: Programmable logic controller (PLC) power module requiring −40°C to +85°C operation and high reliability under brownout conditions. IC Role / Device Role / Timing Role: Active PFC controller managing input current waveform in conjunction with downstream LLC resonant converter. Use Value: UVLO hysteresis (0.3–0.5 V) and robust 150 µA start-up ensure reliable restart after deep sags; OVP/EN window prevents overvoltage damage during load transients. |
| Medical Imaging Power Systems | LED Streetlight Drivers |
|
Use Scenario: CT scanner power system needing low EMI, high efficiency, and fail-safe shutdown under overvoltage fault. IC Role / Device Role / Timing Role: PFC stage controller with integrated OVP/EN monitoring and zero-power comparator for standby disable. Use Value: 7.5 V reference stability (±13 mV) ensures consistent voltage loop performance; OVP hysteresis (300–600 mV) prevents nuisance tripping during transient surges. |
Use Scenario: Outdoor LED streetlight with wide-input-range offline driver and thermal derating requirements. IC Role / Device Role / Timing Role: Boost PFC controller operating at 65 kHz with programmable output voltage to match downstream buck-boost stage. Use Value: VAI pin enables adaptive output voltage (e.g., 380 V at high line, 320 V at low line), reducing MOSFET conduction loss by 22% and improving overall system efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2819APW | TSSOP-16 package (4.4 mm × 5.0 mm), lower θJA (123–147°C/W), MSL Level-2 vs Level-1 | Better suited for space-constrained, thermally dense PCB layouts with automated reflow | Select when board area is limited and thermal management requires finer pitch packaging |
| UCC3819AD | 0°C to +70°C temp range, no VAI pin access, identical pinout and core functionality | Targeted for commercial-grade applications where extended temperature range and output voltage tracking are not required | Choose for cost-sensitive, non-industrial designs where −40°C operation and programmable VAI are unnecessary |
Compared with UCC2819APW, the UCC2819AD offers higher thermal margin in SOIC packaging but larger footprint; versus UCC3819AD, it adds industrial temperature rating and VAI-based tracking capability-critical for adaptive PFC in variable-line applications.
Availability
UCC2819AD is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC converters, medical imaging systems, and outdoor LED drivers requiring stable component supply across extended temperature and long product lifecycles.
Supply support for UCC2819AD 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 high-reliability power conversion ICs.
The UCC2819AD belongs to TI's UCCx81x family of BiCMOS PFC controllers, 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 of the UCC2819AD?
The UCC2819AD is rated for −40°C to +85°C ambient operation, making it suitable for industrial and telecom power supplies where extended thermal performance is required. This range is explicitly specified in the Electrical Characteristics table and distinguishes it from the commercial-grade UCC3819AD (0°C to +70°C).
How does the VAI pin function in the UCC2819AD?
The VAI pin on the UCC2819AD is the externally accessible non-inverting input of the voltage error amplifier. It enables programmable output voltage-commonly tied to VFF for line-voltage tracking-allowing dynamic adjustment of the boost output (e.g., 320 V at low line, 380 V at high line) to reduce component stress and improve efficiency.
What is the maximum gate drive current capability of the UCC2819AD?
The UCC2819AD DRVOUT pin delivers ±1.2 A peak source/sink current, with 9 Ω typical pull-up and 4 Ω typical pull-down resistance. This enables direct driving of medium-power MOSFET gates without external buffers, provided appropriate series gate resistance (e.g., 11 Ω) is used to damp ringing.
Does the UCC2819AD include over-voltage protection?
Yes, the UCC2819AD includes integrated over-voltage protection via the OVP/EN pin-a window comparator that disables the gate driver if the boost output exceeds a user-programmed threshold. It also enables full system disable when pulled below 1.9 V, supporting safe shutdown and sequencing.
What package options are available for the UCC2819AD?
The UCC2819AD is offered exclusively in the 16-pin SOIC (D) package per TI's official packaging addendum. Alternate variants like UCC2819APW use TSSOP, but the "AD" suffix denotes SOIC packaging-confirmed by orderable part numbers UCC2819AD, UCC2819AD.A, UCC2819ADR, and UCC2819ADR.A.
UCC2819AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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-SOIC
UCC2819AD FAQ
1.How can I place an order for UCC2819AD through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2819AD 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 UCC2819AD reliable?
The price and inventory of UCC2819AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2819AD is usually 5 days.
3.What payment methods are accepted for UCC2819AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2819AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2819AD?
UCC2819AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2819AD 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 UCC2819AD?
For technical support, including UCC2819AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2819AD requirements.
6.How does Aetrix verify that UCC2819AD is sourced from the original manufacturer or authorized distributors?
All UCC2819AD 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 UCC2819AD meets industry standards.
7.What is the process for return or replacement of UCC2819AD?
All UCC2819AD units undergo pre-shipment inspection (PSI). If there is an issue with UCC2819AD, 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 UCC2819AD part is unused and in its original packaging.
Return procedure for UCC2819AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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