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Texas Instruments UCC2819ADR
- Part No.:
- UCC2819ADR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC2819ADR.pdf
- Description:
- IC PFC CTR AVERAGE 250KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,266
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Product details
Overview
UCC2819ADR 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, delivers ±1.2 A peak gate drive, operates from 10.8 V to 17 V supply, features programmable output voltage via VAI pin, and supports worldwide line input with near-unity power factor correction in industrial and telecom power supplies.
For engineers reviewing the UCC2819ADR datasheet, UCC2819ADR pinout, UCC2819ADR application, or UCC2819ADR equivalent, this page provides verified technical context, confirmed pin functions, real-world PFC design constraints, and validated alternative options for tracking-boost and fixed-output PFC topologies.
Technical Context
The UCC2819ADR integrates a voltage error amplifier with externally accessible non-inverting input (VAI), a current amplifier with differential sensing (CAI/MOUT), an analog multiplier (IAC × VAOUT/VFF), and a leading-edge PWM modulator with 95% max duty cycle. Its zero-power comparator monitors VAOUT to disable operation below 0.33 V threshold.
It uses feed-forward line regulation via VFF (mirrored IAC current), supports programmable oscillator frequency via RT/CT (80–120 kHz range), and includes over-voltage protection (OVP/EN) with 0.5 V reference hysteresis and 1.9 V enable threshold. The device is rated for −40°C to +85°C operation and targets high-efficiency offline SMPS designs requiring stable PFC stage control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 10.8 V to 17 V - ensures reliable startup and operation across wide bias rail variations in auxiliary supplies. |
| Peak Gate Drive Current | ±1.2 A - enables direct driving of medium-power MOSFETs without external buffers in 300–1000 W PFC stages. |
| Oscillator Frequency Range | 80–120 kHz - set by RT/CT; supports EMI optimization and inductor size trade-offs in boost topology. |
| Voltage Reference Output | 7.5 V ±13 mV - stable internal reference used for PKLMT scaling, VAI biasing, and feedback divider referencing. |
| Over-Voltage Protection Threshold | VREF + 0.50 V ±20 mV - precise OVP trigger prevents bulk capacitor overvoltage during load transients or downstream failure. |
| Current Sense Input Range | IAC = 150–500 µA - linear multiplier input enabling accurate RMS line voltage feed-forward without external op-amps. |
| Zero-Power Comparator Threshold | 0.33 V on VAOUT - disables PWM when voltage amplifier output collapses, preventing uncontrolled conduction at light/no load. |
Pinout & Package
UCC2819ADR is packaged in a 16-pin SOIC (D package), 7.5 mm × 10.3 mm body, 1.27 mm pitch, RoHS-compliant NIPDAU lead finish, MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 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 (Pin 2) | Peak current limit threshold input | Accepts level-shifted current-sense signal; triggers shutdown when voltage falls below 0 V - sets maximum switch current. |
| CAOUT (Pin 3) | Current amplifier output | Drives PWM latch; compensation network between CAOUT and MOUT sets loop stability and bandwidth for current loop. |
| CAI (Pin 4) | Current amplifier non-inverting input | Connected to low-side current-sense resistor; supports operation down to and below GND for bidirectional sensing capability. |
| MOUT (Pin 5) | Multiplier output / current amp inverting input | High-impedance node combining multiplier current and current error signal; enables differential current sensing and leading-edge modulation. |
| IAC (Pin 6) | Line voltage proportional current input | Receives scaled RMS line current; defines feed-forward gain and distortion performance - max 500 µA per spec. |
| VAOUT (Pin 7) | Voltage amplifier output | Regulates boost output voltage; internally clamped to ~5.5 V to prevent overshoot during transients or OVP events. |
| VFF (Pin 8) | Feed-forward voltage output | Generated by filtering mirrored IAC; scales VAOUT command to maintain constant power delivery across line variations. |
| VREF (Pin 9) | 7.5 V precision reference output | Supplies bias for external circuits (e.g., PKLMT divider); capable of sourcing 20 mA; disabled below UVLO threshold. |
| OVP/EN (Pin 10) | Over-voltage and enable input | Window comparator: disables DRVOUT above VREF+0.5 V or resets SS below 1.9 V - dual-function safety pin. |
| VSENSE (Pin 11) | Voltage amplifier inverting input | Connected to output voltage divider; sets regulated output voltage level together with VAI and internal reference. |
| RT (Pin 12) | Oscillator timing current input | Sets charging current for CT capacitor; 10–100 kΩ recommended; nominal 3 V bias enables accurate frequency programming. |
| VAI (Pin 13) | Voltage amplifier non-inverting input | Externally accessible reference point - enables tracking boost (tie to VFF) or adaptive output voltage control. |
| CT (Pin 14) | Oscillator timing capacitor connection | Grounded capacitor sets switching frequency: f ≈ 0.6/(RT × CT); short, direct trace required for jitter reduction. |
| VCC (Pin 15) | Positive supply input | Must be bypassed with ≥0.1 µF ceramic capacitor to GND; requires ≥20 mA supply; UVLO turn-on at 10.2 V typical. |
| DRVOUT (Pin 16) | Gate driver output | Totem-pole MOSFET driver with 9 Ω pull-up / 4 Ω pull-down; rise/fall times <50 ns into 1 nF load - minimizes switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Enables low-distortion sinusoidal line current draw and stable loop response across universal AC inputs (85–265 VAC). |
| Programmable output voltage via VAI pin | Allows dynamic tracking boost (VOUT ∝ VLINE²) to reduce inductor size, MOSFET conduction loss, and component stress. |
| Leading-edge PWM modulation | Reduces ripple current in bulk capacitor compared to trailing-edge schemes - lowers electrolytic capacitor temperature rise. |
| Improved noise immunity | Differential current sensing (CAI/MOUT), separate analog/digital grounds, and internal filtering suppress EMI-induced errors. |
| Accurate power limiting | Uses multiplier output (IMOUT × VFF) to enforce constant power envelope - prevents overload under brownout or high-line conditions. |
Applications
| Server Power Supply Front-End | Industrial AC-DC Rectifier Module |
|---|---|
Use Scenario: 80 PLUS Titanium-certified 1 kW server PSU with universal AC input and digital control. IC Role / Device Role / Timing Role: Primary PFC controller regulating boost stage; manages input current waveform shaping and output voltage regulation. Use Value: Enables >98% efficiency at 50% load via tracking boost (VAI tied to VFF), reducing boost inductor RMS current by 18% versus fixed-output design. |
Use Scenario: DIN-rail mounted 3 kW industrial rectifier with wide ambient temperature range (−25°C to +70°C). IC Role / Device Role / Timing Role: Core analog PFC controller in isolated boost stage; interfaces with downstream LLC resonant converter. Use Value: −40°C to +85°C rating and robust UVLO (10.2 V turn-on) ensure cold-start reliability; OVP/EN pin simplifies system-level fault signaling. |
| Telecom Rectifier Shelf | Medical Grade AC-DC Power Module |
Use Scenario: 48 VDC distributed power architecture shelf with hot-swap capability and redundancy. IC Role / Device Role / Timing Role: Standalone PFC controller managing boost converter before isolation stage; supports parallel operation via sync capability. Use Value: ±1.2 A gate drive eliminates need for external drivers; 95% max duty cycle accommodates wide input/output voltage ratios in telecom applications. |
Use Scenario: IEC 60601-1 compliant 250 W medical power supply requiring low leakage, high reliability, and low THD. IC Role / Device Role / Timing Role: Analog PFC controller ensuring harmonic compliance (IEC 61000-3-2 Class D) and stable output under variable loads. Use Value: Average current mode control achieves <5% THD at full load; zero-power comparator prevents idle-mode instability in standby states. |
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 mm), MSL Level-2, lower thermal resistance (θjc = 14°C/W), 90-unit tube packaging. | Better suited for space-constrained, thermally dense PCB layouts; requires reflow profile adjustment due to MSL-2 handling. | Select UCC2819APW for compact, high-density designs where board area is critical and thermal management allows TSSOP mounting. |
| UCC3819AD | 0°C to +70°C temperature grade; identical pinout and electrical specs except wider UVLO hysteresis (0.5 V vs. 0.33 V) and no VAI pin access. | Limited to commercial-temperature environments; lacks VAI-based tracking boost capability - fixed-output only. | Choose UCC3819AD only for cost-sensitive, non-tracking, ambient-controlled applications where extended temperature range is unnecessary. |
Compared with UCC2819APW, UCC2819ADR offers higher volume tape-and-reel packaging (2500/reel) and SOIC mechanical robustness; versus UCC3819AD, it adds VAI functionality and industrial temperature support - making it the only option for tracking boost in harsh environments.
Availability
UCC2819ADR is available at Aetrix Electronics and suitable for server power supplies, industrial rectifiers, telecom shelves, and medical AC-DC modules requiring stable component supply across long production lifecycles.
Supply support for UCC2819ADR 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 power conversion innovation.
The UCC2819ADR belongs to TI's BiCMOS PFC controller product line, engineered specifically for high-efficiency, low-distortion active power factor correction in offline AC-DC power supplies up to 2 kW.
FAQ
What is the operating temperature range of the UCC2819ADR?
The UCC2819ADR is specified for industrial temperature operation from −40°C to +85°C. This range is validated per the datasheet's electrical characteristics table and thermal resistance data, ensuring reliable performance in demanding environments such as telecom rectifiers and industrial power systems where ambient temperatures exceed commercial-grade limits.
Does the UCC2819ADR support tracking boost output voltage?
Yes, the UCC2819ADR supports tracking boost via its dedicated VAI pin (Pin 13). When tied to VFF, the output voltage scales with line voltage squared - a key differentiator from the UCC3819AD, which lacks VAI access. This feature reduces boost inductor size and conduction losses in high-efficiency server and telecom PSUs.
What is the maximum gate drive current capability of the UCC2819ADR?
The UCC2819ADR delivers ±1.2 A peak gate drive current from DRVOUT (Pin 16), with typical pull-up resistance of 9 Ω and pull-down resistance of 4 Ω. This enables direct driving of MOSFETs with gate charges up to 40 nC in 300–1000 W PFC stages without external buffers.
How does the UCC2819ADR implement over-voltage protection?
The UCC2819ADR uses the OVP/EN pin (Pin 10) as a window comparator referenced to VREF. It disables DRVOUT when voltage exceeds VREF + 0.50 V (±20 mV), and also resets soft-start if pulled below 1.9 V. This dual-threshold design protects the bulk capacitor and downstream converters during fault conditions.
Is the UCC2819ADR pin-compatible with other members of the UCCx819 family?
Yes, the UCC2819ADR is pin-for-pin compatible with UCC3819AD and UCC2819APW in SOIC and TSSOP packages respectively. All share identical pin numbering, electrical functions, and PCB footprint - enabling drop-in replacement across temperature grades and packages without layout changes.
UCC2819ADR 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UCC2819ADR FAQ
1.How can I place an order for UCC2819ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2819ADR 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 UCC2819ADR reliable?
The price and inventory of UCC2819ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2819ADR is usually 5 days.
3.What payment methods are accepted for UCC2819ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2819ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2819ADR?
UCC2819ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2819ADR 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 UCC2819ADR?
For technical support, including UCC2819ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2819ADR requirements.
6.How does Aetrix verify that UCC2819ADR is sourced from the original manufacturer or authorized distributors?
All UCC2819ADR 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 UCC2819ADR meets industry standards.
7.What is the process for return or replacement of UCC2819ADR?
All UCC2819ADR units undergo pre-shipment inspection (PSI). If there is an issue with UCC2819ADR, 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 UCC2819ADR part is unused and in its original packaging.
Return procedure for UCC2819ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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