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Texas Instruments UCC2819D
- Part No.:
- UCC2819D
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC2819D.pdf
- Description:
- IC PFC CTR AVERAGE 250KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,491
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Product details
Overview
UCC2819D from Texas Instruments is a BiCMOS active power factor correction (PFC) controller for boost preregulators, implementing average current mode control to achieve near-unity power factor across worldwide AC line voltages (85–265 VAC). It operates from 10.8 V to 17 V VCC, features programmable output voltage via the VAI pin, and delivers 93–100% maximum duty cycle with leading-edge modulation for reduced bulk capacitor ripple. Used in industrial and telecom AC/DC front-end supplies.
For engineers reviewing the UCC2819D datasheet, UCC2819D pinout, UCC2819D application, or UCC2819D equivalent, key selection considerations include its −40°C to 85°C temperature rating, 7.5 V internal reference accuracy (±0.131 V), 150 µA typical start-up current, OVP/EN window comparator, and tracking boost topology support via VAI/VFF interface.
Technical Context
The UCC2819D employs an analog multiplier with feed-forward (VFF) and current-sense (IAC, CAI/MOUT) inputs to shape input current waveform proportionally to line voltage. Its voltage amplifier (VAOUT/VAI/VSENSE) regulates boost output with programmable setpoint, while the current amplifier (CAOUT/CAI/MOUT) drives PWM via a high-bandwidth error path.
It integrates UVLO with 10.2 V turn-on / 9.7 V turn-off thresholds, overvoltage protection referenced to VREF + 0.5 V (hysteresis 300–600 mV), and zero-power detection on VAOUT (0.20–0.50 V threshold). Oscillator frequency is set by RT/CT (typ. 100 kHz, ±15% total variation), and DRVOUT provides totem-pole gate drive with 5–12 Ω pullup and 2–10 Ω pulldown resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 10.8 V to 17 V - supports wide-input auxiliary bias supplies without external regulation |
| Reference Voltage | 7.5 V ±0.131 V (−40°C to 85°C) - stable precision reference for feedback and PKLMT scaling |
| Oscillator Frequency | 80–120 kHz - programmable via RT/CT; enables optimized EMI and magnetics design |
| Start-Up Current | 150 µA typical - minimizes pre-bias loss in high-efficiency PFC stages |
| Max Duty Cycle | 93–100% - ensures full boost range capability at low-line conditions |
| UVLO Thresholds | Turn-on: 10.2 V, Turn-off: 9.7 V - 0.5 V hysteresis prevents chatter during brownout recovery |
| OVP Reference | VREF + 0.50 V ±20 mV - precise overvoltage trip point for downstream converter protection |
Pinout & Package
UCC2819D is housed in a 16-pin SOIC (D) package with standard 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and JEDEC Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference ground | Common return for all analog and power circuits; requires low-inductance 0.1 µF ceramic bypass |
| PKLMT (Pin 2) | Peak current limit threshold input | Zero-volt-referenced comparator input; level-shifted via resistor divider from current-sense resistor |
| CAOUT (Pin 3) | Current amplifier output | High-bandwidth op-amp output driving PWM latch; connects to MOUT for compensation network |
| CAI (Pin 4) | Current amplifier non-inverting input | Connects to GND side of current-sense resistor; functional down to below GND for bidirectional sensing |
| MOUT (Pin 5) | Multiplier output & current amp inverting input | High-impedance node combining analog multiplier current and CAI feedback; enables leading-edge modulation |
| IAC (Pin 6) | Line voltage proportional current input | Accepts 150–500 µA current proportional to instantaneous AC line voltage; sets multiplier gain |
| VAOUT (Pin 7) | Voltage amplifier output | Internally clamped to ~5.5 V; drives multiplier and zero-power comparator; used for tracking boost control |
| VFF (Pin 8) | Feed-forward RMS voltage output | Generated by mirroring IAC through external RC filter; scales VAOUT setpoint for line-voltage tracking |
| DRVOUT (Pin 9) | Gate driver output | Totem-pole MOSFET driver; requires series gate resistor (≥8 Ω at 16 V VCC) to suppress overshoot |
| VCC (Pin 10) | Positive supply input | Must be ≥20 mA capable; bypassed directly to GND; inhibits DRVOUT until UVLO threshold is exceeded |
| CT (Pin 11) | Oscillator timing capacitor connection | Connects to GND via capacitor; sets fSW = 0.6/(RTCT); short trace required for stability |
| VAI (Pin 12) | Voltage amplifier non-inverting input | Externally accessible for dynamic output voltage programming (e.g., tied to VFF for tracking boost) |
| RT (Pin 13) | Oscillator charging current input | Connects to GND via 10–100 kΩ resistor; sets oscillator current and thus switching frequency |
| VSENSE (Pin 14) | Voltage amplifier inverting input | Connected to output voltage divider; forms feedback loop with VAOUT and VAI for output regulation |
| OVP/EN (Pin 15) | Overvoltage/enable window comparator | Disables DRVOUT if boost voltage exceeds VREF+0.5 V; also disables entire controller if pulled <1.9 V |
| VREF (Pin 16) | 7.5 V precision reference output | Supplies 20 mA max; disabled below UVLO; bypassed with ≥0.1 µF ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage (VAI Pin) | Enables line-voltage-tracking boost topology-reduces inductor size and MOSFET conduction losses at low line |
| Average Current Mode Control | Delivers low-distortion sinusoidal line current with inherent stability and immunity to subharmonic oscillation |
| Leading-Edge Modulation | Reduces ripple current in bulk electrolytic capacitors, extending lifetime and lowering RMS heating |
| Accurate Power Limiting (PKLMT) | Zero-reference peak current limit with 150–500 ns propagation delay ensures fast, consistent overcurrent response |
| Improved Feed-Forward Line Regulation | VFF-based multiplier input compensates for line voltage variations in real time, maintaining constant power delivery |
Applications
| Server Power Supply Front-End | Industrial Motor Drive Input Stage |
|---|---|
Use Scenario: 1 kW AC/DC rectifier in 1U server PSU with universal input (85–265 VAC). IC Role / Device Role / Timing Role: UCC2819D controls boost PFC stage to meet EN61000-3-2 Class A harmonic limits and deliver regulated 380 V DC bus. Use Value: 93–100% duty cycle and 150 µA start-up current enable reliable cold-start and high efficiency (>95%) across full line range. | Use Scenario: Input stage of 5 kW variable-frequency drive accepting 3-phase 380–480 VAC input. IC Role / Device Role / Timing Role: UCC2819D implements single-phase PFC on each leg to reduce input current THD and stabilize DC link voltage. Use Value: VAI/VFF tracking allows output voltage scaling (e.g., 650 V at 480 VAC, 540 V at 380 VAC), reducing stress on downstream IGBTs and snubbers. |
| Telecom Rectifier Module | Medical Imaging Power System |
Use Scenario: -48 V DC telecom rectifier with hot-swap and redundancy support, operating from 90–264 VAC. IC Role / Device Role / Timing Role: UCC2819D manages boost PFC to deliver tightly regulated +380 V DC for downstream LLC resonant converters. Use Value: OVP/EN window comparator provides fail-safe shutdown if output exceeds 395 V, protecting downstream isolation transformers and MOSFETs. | Use Scenario: High-reliability CT scanner power system requiring >99.99% uptime and strict EMI compliance. IC Role / Device Role / Timing Role: UCC2819D serves as primary PFC controller in dual-redundant front-end, enabling seamless switchover and harmonic suppression. Use Value: −40°C to 85°C rating and 7.5 V reference stability (±0.131 V) ensure consistent performance under thermal cycling and long-term operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2818D | Lacks VAI pin; no programmable output voltage; SS pin present instead | Fixed-output boost only; cannot implement tracking boost or dynamic voltage scaling | Select when fixed 385 V output is sufficient and cost optimization is prioritized over flexibility |
| L6562ATDTR | Operates up to 250 kHz; uses transconductance amplifier; no integrated VREF or VFF generator | Requires external reference and feed-forward circuitry; higher component count for same functionality | Select when higher switching frequency is needed for smaller magnetics and layout space is constrained |
Compared with UCC2819D, UCC2818D offers lower BOM cost but forfeits output voltage programmability, while L6562ATDTR provides higher frequency headroom but demands additional external components for reference and feed-forward generation-making UCC2819D optimal for robust, feature-complete, single-chip tracking PFC designs.
Availability
UCC2819D is available at Aetrix Electronics and suitable for industrial motor drives, telecom rectifiers, medical imaging systems, and server power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UCC2819D 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.
The UCC2819D belongs to TI's legacy PFC controller product line, designed specifically for high-performance active power factor correction in AC/DC front-end converters targeting industrial, telecom, and medical applications.
FAQ
What is the operating temperature range for the UCC2819D?
The UCC2819D is rated for −40°C to +85°C ambient operating temperature, matching its industrial-grade qualification and distinguishing it from the commercial-grade UCC3819D (0°C to 70°C). This extended range ensures reliable operation in demanding environments such as base station power supplies and factory automation equipment where thermal margins are critical. The UCC2819D maintains full specification compliance-including 7.5 V reference accuracy and 100 kHz oscillator stability-across this full range.
How does the VAI pin enable tracking boost functionality in the UCC2819D?
The VAI pin on the UCC2819D is the non-inverting input of the internal voltage error amplifier, externally accessible to allow dynamic setting of the boost output voltage. When tied to the VFF pin-which outputs a DC voltage proportional to RMS line voltage-the UCC2819D automatically scales its regulated output (e.g., from 380 V at 230 VAC to 320 V at 115 VAC). This reduces inductor size, MOSFET conduction losses, and bulk capacitor stress. The UCC2819D's VAI architecture eliminates need for external DACs or microcontrollers in tracking implementations.
What is the purpose of the OVP/EN pin on the UCC2819D?
The OVP/EN pin on the UCC2819D serves a dual function: it acts as a window comparator for overvoltage protection (trip point = VREF + 0.50 V ±20 mV) and as an enable/disable input (disable threshold <1.9 V). When boost output exceeds the programmed OVP threshold, DRVOUT is immediately disabled to protect downstream circuitry. If the pin is pulled below 1.9 V-such as during fault or standby-it resets the internal logic and halts all switching. This dual-role pin simplifies protection circuitry and improves system-level safety in the UCC2819D.
Can the UCC2819D be used in discontinuous conduction mode (DCM) PFC applications?
The UCC2819D is explicitly designed for continuous conduction mode (CCM) average current mode control in boost PFC topologies and does not support DCM operation. Its current amplifier architecture, multiplier transfer function, and PWM latch timing assume CCM waveforms. Attempting DCM use results in unstable current regulation and distorted line current. For DCM PFC, TI recommends alternatives like the UCC28019 or L6562 series. The UCC2819D's datasheet specifies CCM-only operation and provides design equations and compensation guidance exclusively for CCM boost converters.
What are the absolute maximum ratings for the DRVOUT pin of the UCC2819D?
The DRVOUT pin of the UCC2819D has an absolute maximum rating of 1.2 A peak source/sink current and a continuous rating of 0.2 A. Exceeding these values risks permanent damage to the internal totem-pole driver. Additionally, the pin must not be driven below −0.5 V relative to GND. Designers must select an external gate resistor that limits peak current within these bounds while controlling rise/fall times (25–50 ns typical) and suppressing overshoot-TI recommends ≥8 Ω for 16 V VCC per Figure 7 in the UCC2819D datasheet SLUS482B.
UCC2819D 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
UCC2819D FAQ
1.How can I place an order for UCC2819D through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2819D 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 UCC2819D reliable?
The price and inventory of UCC2819D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2819D is usually 5 days.
3.What payment methods are accepted for UCC2819D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2819D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2819D?
UCC2819D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2819D 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 UCC2819D?
For technical support, including UCC2819D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2819D requirements.
6.How does Aetrix verify that UCC2819D is sourced from the original manufacturer or authorized distributors?
All UCC2819D 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 UCC2819D meets industry standards.
7.What is the process for return or replacement of UCC2819D?
All UCC2819D units undergo pre-shipment inspection (PSI). If there is an issue with UCC2819D, 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 UCC2819D part is unused and in its original packaging.
Return procedure for UCC2819D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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