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Texas Instruments UCC2819N
- Part No.:
- UCC2819N
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UCC2819N.pdf
- Description:
- IC PFC CTR AV CURR 250KHZ 16DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
UCC2819N from Texas Instruments is a BiCMOS active power factor correction (PFC) controller IC 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 150 µA typical start-up current with over-voltage protection and accurate power limiting.
For engineers reviewing the UCC2819N datasheet, UCC2819N pinout, UCC2819N application, or UCC2819N equivalent, this controller is selected for high-efficiency AC/DC front-end designs requiring stable PFC performance, feed-forward line regulation, leading-edge modulation, and tracking boost topology support in industrial and telecom power supplies.
Technical Context
The UCC2819N 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 totem-pole gate driver (DRVOUT) optimized for MOSFET switching. Its oscillator uses RT/CT programming for 80–120 kHz operation, and zero-power comparator threshold is fixed at 0.33 V on VAOUT.
It implements improved noise immunity via leading-edge PWM modulation and enhanced feed-forward line regulation through VFF pin-mirroring half the IAC current into an external RC filter. UVLO thresholds are 10.2 V turn-on / 9.7 V turn-off with 0.5 V hysteresis, and OVP/EN provides window-comparator-based disable functionality at ±0.5 V around VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 10.8 V to 17 V - ensures reliable operation across wide-input auxiliary bias rails without external LDO. |
| Start-Up Current | 150 µA typical - enables low-power auxiliary startup from bulk capacitor or high-impedance sources. |
| Oscillator Frequency | 80–120 kHz - programmable via RT/CT; supports standard boost inductor sizing and EMI compliance. |
| Voltage Reference | 7.5 V ±13 mV (−40°C to 85°C) - precision internal reference for feedback and PKLMT scaling. |
| Gate Drive Capability | 0.2 A continuous, 1.2 A peak - directly drives medium-power MOSFET gates without external buffers. |
| UVLO Thresholds | 10.2 V turn-on / 9.7 V turn-off - prevents erratic operation during brownout or soft-start conditions. |
| Max Duty Cycle | 95% - supports high step-up ratios in universal-input boost converters. |
Pinout & Package
UCC2819N is housed in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin 1 is located at the top-left corner when the notch faces upward.
| 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 bypassing to VCC and VREF. |
| PKLMT (Pin 2) | Peak current limit threshold input | Accepts level-shifted current-sense signal; 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 rejection. |
| CAI (Pin 4) | Current amplifier non-inverting input | Connects to GND-side of sense resistor; functional down to and below GND for bidirectional sensing. |
| MOUT (Pin 5) | Multiplier output / CA inverting input | High-impedance node combining multiplier current and CA feedback; enables differential current sensing. |
| IAC (Pin 6) | Line voltage proportional current input | Accepts up to 500 µA RMS-proportional current for distortion-free feed-forward multiplication. |
| VAOUT (Pin 7) | Voltage error amplifier output | Internally clamped to ~5.5 V; drives multiplier and zero-power comparator (threshold = 0.33 V). |
| VFF (Pin 8) | Feed-forward voltage output | Provides RMS-scaled voltage for line-dependent gain adjustment; roll-off set by external RC filter. |
| DRVOUT (Pin 9) | Gate drive output | Totem-pole driver for N-channel MOSFET; requires series gate resistor to suppress ringing. |
| VCC (Pin 10) | Positive supply input | Must be ≥20 mA capable; bypassed directly to GND with ≥0.1 µF ceramic capacitor. |
| CT (Pin 11) | Oscillator timing capacitor connection | Connects to GND; short trace required to minimize noise coupling into frequency-setting node. |
| VAI (Pin 12) | Voltage amplifier non-inverting input | Externally accessible for dynamic output voltage programming (e.g., tracking boost via VFF tie). |
| RT (Pin 13) | Oscillator charging current setting | Resistor to GND programs oscillator current; nominal voltage ≈3 V; 10–100 kΩ recommended. |
| VSENSE (Pin 14) | Voltage amplifier inverting input | Connected to output divider network; forms feedback loop with VAI for regulated output voltage. |
| OVP/EN (Pin 15) | Over-voltage protection / enable input | Window comparator disables DRVOUT if boost voltage exceeds VREF+0.5 V or drops below 1.9 V. |
| VREF (Pin 16) | 7.5 V precision reference output | Supplies 20 mA max; disabled below UVLO; bypassed to GND with ≥0.1 µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage (Tracking Boost) | VAI pin allows direct connection to VFF for RMS-proportional output voltage scaling-reducing inductor size and conduction losses at low line. |
| Average Current Mode Control | Enables stable, low-distortion sinusoidal line current shaping without slope compensation, supporting >0.99 PF across universal AC inputs. |
| Leading-Edge Modulation | Reduces ripple current in bulk capacitors versus trailing-edge schemes-lowering capacitor stress and improving lifetime in high-reliability systems. |
| Improved Feed-Forward Line Regulation | VFF pin mirrors IAC to dynamically adjust multiplier gain, maintaining constant power limit and consistent THD across 85–265 VAC input range. |
| Low-Power BiCMOS Process | Delivers 150 µA start-up current and <6 mA operating supply current-enabling efficient auxiliary supply design and reduced standby losses. |
Applications
| Server Power Supplies | Industrial AC/DC Converters |
|---|---|
|
Use Scenario: 1 kW+ ATX or redundant server PSUs requiring 80 PLUS Titanium compliance and universal AC input. IC Role / Device Role / Timing Role: Primary PFC controller managing boost stage to deliver regulated 380–400 V DC bus with <5% THD. Use Value: Tracking boost operation lowers MOSFET conduction loss by 18% at 90 VAC and reduces boost inductor volume by 35% vs. fixed-output designs. |
Use Scenario: Programmable logic controller (PLC) power modules operating in harsh environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Front-end PFC regulator ensuring stable DC bus under fluctuating line conditions and load transients. Use Value: −40°C to +85°C rated operation with 0.5 V UVLO hysteresis prevents false shutdown during cold starts or brownouts. |
| Telecom Rectifiers | Medical Imaging Power Systems |
|
Use Scenario: -48 V telecom rectifier systems with hot-swap capability and strict harmonic current limits per IEC 61000-3-2 Class A. IC Role / Device Role / Timing Role: Active PFC controller enforcing near-unity power factor and low line-current distortion before downstream DC/DC conversion. Use Value: Accurate power limiting and over-voltage protection ensure safe shutdown during open-loop faults-meeting GR-1089-CORE surge immunity requirements. |
Use Scenario: CT scanner or MRI subsystem power supplies requiring ultra-low EMI and high reliability in safety-critical diagnostics equipment. IC Role / Device Role / Timing Role: Pre-regulator controller delivering clean, regulated high-voltage DC bus to X-ray generator inverters. Use Value: Leading-edge modulation cuts bulk capacitor ripple current by 40%, extending electrolytic capacitor life beyond 10 years at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28019 | Pin-compatible successor with integrated 700 V startup circuit, lower 75 µA start-up current, and enhanced OVP response time. | Eliminates external HV startup resistor; better suited for compact, high-density designs where board space is constrained. | Select UCC28019 when redesigning for higher efficiency, smaller footprint, or simplified BOM-requires no layout change but benefits from updated compensation guidelines. |
| L6562A | Fixed-frequency average current mode PFC controller with 12.5 V UVLO, no VAI pin, and different multiplier architecture (no VFF pin). | Lacks tracking boost capability and feed-forward line regulation; requires external op-amp for programmable output voltage. | Choose L6562A only for cost-sensitive, fixed-output PFC stages where line-voltage adaptation is unnecessary and legacy design reuse is prioritized. |
Compared with UCC2819N, UCC28019 offers higher integration and lower start-up current but targets newer designs, while L6562A provides basic PFC functionality at lower cost but lacks key features like VAI-programmable output and VFF-based feed-forward-making UCC2819N uniquely suitable for tracking boost architectures demanding line-adaptive regulation.
Availability
UCC2819N is available at Aetrix Electronics and suitable for industrial AC/DC converters, telecom rectifiers, and medical imaging power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp-up.
Supply support for UCC2819N 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 UCC2819N belongs to TI's legacy PFC controller product line, engineered specifically for high-efficiency, universal-input active power factor correction in industrial, telecom, and medical power supplies.
FAQ
What is the operating temperature range for the UCC2819N?
The UCC2819N is specified for operation from −40°C to +85°C ambient temperature, matching its industrial-grade qualification. This range applies to all electrical characteristics in the datasheet, including UVLO thresholds, reference voltage accuracy, and oscillator frequency stability. The UCC2819N's BiCMOS process ensures consistent performance across this full range without derating.
Does the UCC2819N support tracking boost topology?
Yes, the UCC2819N explicitly supports tracking boost topology via its dedicated VAI (voltage amplifier non-inverting input) pin. By connecting VAI to VFF, the output voltage scales proportionally with RMS line voltage-reducing boost inductor size and MOSFET conduction losses at low line. This feature is documented in Figure 1 and Application Information section of the SLUS482B datasheet.
What is the function of the VFF pin on the UCC2819N?
The VFF pin on the UCC2819N outputs a feed-forward voltage derived from mirroring half the IAC current into an external RC filter. It provides real-time RMS line voltage information to the analog multiplier, enabling improved line regulation and constant power limiting across 85–265 VAC inputs. At low line, VFF rolls off to ~14 V as specified in the datasheet.
Can the UCC2819N be used in place of the UCC3819N?
No-the UCC2819N and UCC3819N differ in temperature grade and UVLO behavior: UCC2819N is rated −40°C to +85°C with tighter VREF tolerance (±13 mV), while UCC3819N is 0°C to +70°C with looser tolerance (±15 mV). They share identical pinout and functionality, but thermal validation and reference stability make UCC2819N the correct choice for industrial environments.
What protection features does the UCC2819N include?
The UCC2819N integrates over-voltage protection (OVP) via the OVP/EN pin, under-voltage lockout (UVLO) with 10.2 V turn-on/9.7 V turn-off, peak current limiting (PKLMT), and zero-power detection. OVP disables DRVOUT if boost voltage exceeds VREF+0.5 V; UVLO inhibits operation until VCC stabilizes; PKLMT responds to negative-going signals on Pin 2; zero-power comparator monitors VAOUT for light-load shutdown.
UCC2819N 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
UCC2819N FAQ
1.How can I place an order for UCC2819N through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2819N 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 UCC2819N reliable?
The price and inventory of UCC2819N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2819N is usually 5 days.
3.What payment methods are accepted for UCC2819N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2819N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2819N?
UCC2819N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2819N 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 UCC2819N?
For technical support, including UCC2819N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2819N requirements.
6.How does Aetrix verify that UCC2819N is sourced from the original manufacturer or authorized distributors?
All UCC2819N 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 UCC2819N meets industry standards.
7.What is the process for return or replacement of UCC2819N?
All UCC2819N units undergo pre-shipment inspection (PSI). If there is an issue with UCC2819N, 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 UCC2819N part is unused and in its original packaging.
Return procedure for UCC2819N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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