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Texas Instruments UCC28019AD
- Part No.:
- UCC28019AD
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC28019AD.pdf
- Description:
- IC PFC CTRLR CCM 65KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,611
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Product details
Overview
UCC28019AD from Texas Instruments is an 8-pin continuous conduction mode (CCM) active power factor correction (PFC) controller for boost topology pre-regulators. It delivers fixed 65 kHz switching, 98% max duty cycle, and integrated 1.5-A source / 2.0-A sink gate driver - enabling high-efficiency PFC stages in 100 W to >2 kW AC-DC supplies for digital TVs and server PSUs.
For engineers reviewing the UCC28019AD datasheet, UCC28019AD pinout, UCC28019AD application, or UCC28019AD equivalent, key selection considerations include its input brown-out protection (0.82 V threshold), output over/undervoltage detection (5.25 V OVP / 4.75 V UVD), and average current-mode control without line voltage sensing - all critical for universal-input, EN61000-3-2-compliant designs.
Technical Context
The UCC28019AD implements dual-loop average current-mode control: the inner current loop uses transconductance amplifier (gmi = 0.95 mS typ.) with ISENSE input and ICOMP output for ripple-averaged inductor current regulation; the outer voltage loop employs a 5-V reference-based error amplifier (gmv = –42 μS typ., enhanced to –440 μS under EDR) driving VCOMP to set current-loop gain.
Its protection architecture integrates cycle-by-cycle peak current limiting (–1.08 V threshold), soft over-current (–0.73 V), open-loop detection (VSENSE < 0.82 V), and UVLO (10.5 V turn-on / 9.5 V turn-off), with fast VCOMP discharge (<150 ms) during VCC loss to prevent inrush on line recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching frequency | 65 kHz ±5% at 25°C; ensures fundamental and 2nd harmonic EMI remain below 150 kHz EN55022 conducted limit |
| Max duty cycle | 98% typical; enables high step-up ratio operation across universal AC input (85–265 VAC) |
| Voltage reference | 5.0 V ±2% over –40°C to +125°C; provides stable regulation setpoint for VSENSE feedback network |
| GATE drive strength | 1.5-A source / 2.0-A sink; directly drives MOSFET gates without external buffers in ≤2 kW designs |
| Input brown-out threshold | 0.82 V (low-to-high enable), 0.76 V (high-to-low disable); sets reliable AC line dropout detection independent of VCC supply |
| Output OVP/UVD | OVP at 5.25 V (105% of 5 V ref), UVD at 4.75 V (95% of 5 V ref); latches off GATE to protect bulk capacitor and downstream converters |
| Standby entry | VSENSE < 0.8 V disables controller and discharges VCOMP; supports low-power user-controlled standby mode |
Pinout & Package
UCC28019AD is available in SOIC-8 (3.91 mm × 4.9 mm) and PDIP-8 (6.35 mm × 9.81 mm) packages. Both variants share identical pinout and electrical functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Device substrate and signal return; must be low-impedance connection to power ground plane |
| ICOMP (Pin 2) | Current loop compensation output | Transconductance amplifier output; capacitor to GND sets current-loop stability; <0.6 V disables controller |
| ISENSE (Pin 3) | Inductor current sense input | Accepts voltage across sense resistor; internal 1.5-μA pull-up forces shutdown if open; supports SOC (–0.73 V) and PCL (–1.08 V) |
| VINS (Pin 4) | Rectified AC line sense input | Resistor-divider interface to bridge output; enables IBOP with 0.82 V brown-out and 1.5 V enable thresholds |
| VCOMP (Pin 5) | Voltage loop compensation output | Error amplifier output; RC network to GND sets voltage-loop stability; precharged to ~1.9 V at startup |
| VSENSE (Pin 6) | Output voltage feedback input | Resistor-divider from PFC output; 5-V reference comparison enables regulation, OVP, UVD, and standby |
| VCC (Pin 7) | Bias supply input | UVLO activation at 10.5 V; requires ≥0.1 μF ceramic bypass cap; powers internal logic and gate driver |
| GATE (Pin 8) | Integrated MOSFET gate driver | Pull-push output clamped to 12.5 V; drives external switch with 1.5-A source / 2.0-A sink capability |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates need for AC line voltage sensing - reduces component count and improves THD performance across universal input range |
| Enhanced Dynamic Response (EDR) | Doubles voltage-loop transconductance (to –440 μS) when VSENSE falls below 4.75 V, enabling rapid recovery from line/load transients |
| Soft-start with pre-charge | VCOMP rapidly pre-charged to ~1.9 V, then ramped linearly by 30 μA current; prevents inrush and ensures controlled output rise |
| Open-pin protection | Internal 100-nA pull-down on VSENSE and 1.5-μA pull-up on ISENSE detect floating pins and force safe shutdown |
| Fast VCOMP discharge | Active discharge path engages when VCC drops below 9.5 V, draining VCOMP to <1.2 V within 150 ms to avoid post-fault surge |
Applications
| Digital TV Power Supply | Server PSU Front-End |
|---|---|
Use Scenario: 200–500 W PFC stage in slim-profile LCD/LED TV with universal AC input and strict Class-D harmonic compliance. IC Role / Device Role / Timing Role: Primary CCM boost PFC controller regulating 380–400 V DC bus; manages average input current waveform shaping via dual-loop control. Use Value: Enables single-stage PFC with <5% THD at full load and 85–265 VAC, meeting EN61000-3-2 without auxiliary line-sensing circuitry. | Use Scenario: 80 PLUS Titanium-certified 1.5 kW server PSU requiring high efficiency (>96%), low standby power, and robust brown-out handling. IC Role / Device Role / Timing Role: Fixed-frequency CCM PFC controller coordinating with downstream LLC resonant converter; provides regulated 385 V DC bus with tight OVP/UVD. Use Value: Delivers 98% peak efficiency and <0.3 W no-load consumption using low ICCSTBY (2.2 mA typ.) and programmable standby entry at VSENSE < 0.8 V. |
| Industrial Motor Drive Input Stage | White Goods Appliance PSU |
Use Scenario: 1–2 kW variable-speed drive with wide input voltage tolerance (85–305 VAC) and immunity to line sags in factory environments. IC Role / Device Role / Timing Role: Active PFC controller managing boost inductor current and output voltage regulation; interfaces with isolated gate drivers via GATE pin. Use Value: Input brown-out protection (0.82 V VINS threshold) prevents nuisance tripping during 10%–15% RMS line dips, ensuring uninterrupted operation. | Use Scenario: Energy-efficient refrigerator or washing machine PSU requiring Class-D compliance, low EMI, and thermal robustness up to 105°C ambient. IC Role / Device Role / Timing Role: CCM PFC controller operating at 65 kHz to place EMI harmonics below 150 kHz; regulates bulk capacitor voltage against load steps. Use Value: Enhanced Dynamic Response (EDR) reduces output voltage dip to <1.5% during 50% load step, maintaining stable DC bus for inverter stage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCM boost PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28070D | Two-phase interleaved CCM controller; 65 kHz per phase; higher integration (dual gate drivers, phase sync); no standalone VINS brown-out comparator | Targeted for >1 kW high-efficiency, low-ripple PFC where interleaving reduces input/output ripple and EMI filter size | Select UCC28070D only when interleaved architecture is required; not drop-in compatible due to different pinout and dual-channel logic |
| L6562ATDTR | Single-phase CCM PFC controller; 65 kHz; lower gate drive (0.6-A sink/0.3-A source); no EDR or VCOMP rapid discharge | Suitable for cost-sensitive <500 W applications where transient response and fault recovery speed are less critical | UCC28019AD offers superior gate drive, faster transient recovery, and more robust protection - choose when reliability and dynamic performance are prioritized |
Compared with UCC28070D and L6562ATDTR, the UCC28019AD provides the optimal balance of single-phase simplicity, strong gate drive, and comprehensive protection - making it ideal for mainstream 100 W–2 kW PFC designs where board space, BOM count, and system-level safety are tightly constrained.
Availability
UCC28019AD is available at Aetrix Electronics and suitable for digital TV power supplies, server front-end converters, and industrial motor drive input stages requiring stable component supply and long-term design continuity.
Supply support for UCC28019AD 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 ICs, with decades of leadership in power conversion control solutions.
The UCC28019AD belongs to TI's active PFC controller product line, designed specifically for high-efficiency, universal-input, CCM boost pre-regulators targeting Class-D harmonic compliance and robust system-level protection in consumer, computing, and industrial power supplies.
FAQ
What is the primary function of the UCC28019AD in a power supply?
The UCC28019AD is an 8-pin continuous conduction mode (CCM) active power factor correction (PFC) controller used in boost topology pre-regulators. Its core function is to shape the input current waveform to match the sinusoidal AC line voltage, achieving high power factor and low THD while regulating a stable DC output bus - essential for meeting EN61000-3-2 Class-D requirements. The UCC28019AD performs this using average current-mode control without requiring direct AC line voltage sensing.
Does the UCC28019AD support universal AC input voltage ranges?
Yes, the UCC28019AD supports universal AC input voltage ranges from 85 VAC to 265 VAC. This is enabled by its input brown-out protection (IBOP) circuitry tied to the VINS pin, which uses user-configurable resistor dividers to set enable (1.5 V) and disable (0.82 V) thresholds corresponding to RMS line voltages. Combined with its 98% maximum duty cycle and 65 kHz fixed-frequency operation, the UCC28019AD maintains stable CCM PFC performance across the full universal input range.
How does the UCC28019AD implement output overvoltage and undervoltage protection?
The UCC28019AD monitors the PFC output voltage via the VSENSE pin using an internal 5.0 V reference. Output overvoltage protection (OVP) triggers when VSENSE exceeds 5.25 V (105% of reference), disabling the GATE output immediately. Undervoltage detection (UVD) activates at 4.75 V (95% of reference), initiating protective action such as reduced duty cycle or latch-off depending on system configuration. Both thresholds are trimmed and stable over temperature (–40°C to +125°C), ensuring reliable bus regulation in the UCC28019AD.
What protection features are built into the UCC28019AD?
The UCC28019AD integrates multiple system-level protections: cycle-by-cycle peak current limiting (–1.08 V on ISENSE), soft over-current (–0.73 V), input brown-out (VINS < 0.82 V), output over/undervoltage (5.25 V / 4.75 V on VSENSE), open-loop detection (VSENSE < 0.82 V), and under-voltage lockout (10.5 V turn-on / 9.5 V turn-off on VCC). It also includes open-pin protection on ISENSE and VSENSE, plus fast VCOMP discharge during VCC loss - all implemented in hardware without external components.
Can the UCC28019AD enter a low-power standby mode?
Yes, the UCC28019AD supports user-controlled low-power standby mode. When the voltage on the VSENSE pin falls below 0.8 V, the controller disables itself and actively discharges the VCOMP compensation capacitor to zero, reducing supply current to 2.2 mA typical. This feature allows systems to meet stringent no-load power requirements (e.g., <0.5 W) in digital TVs and appliances. Standby exit occurs automatically when VSENSE rises above 0.8 V and VINS exceeds 1.5 V, initiating a new soft-start sequence in the UCC28019AD.
UCC28019AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Mode:
- Continuous Conduction (CCM)
- Frequency - Switching:
- 65kHz
- Current - Startup:
- 100 µA
- Voltage - Supply:
- 10V ~ 21V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UCC28019AD FAQ
1.How can I place an order for UCC28019AD through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28019AD 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 UCC28019AD reliable?
The price and inventory of UCC28019AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28019AD is usually 5 days.
3.What payment methods are accepted for UCC28019AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28019AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28019AD?
UCC28019AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28019AD 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 UCC28019AD?
For technical support, including UCC28019AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28019AD requirements.
6.How does Aetrix verify that UCC28019AD is sourced from the original manufacturer or authorized distributors?
All UCC28019AD 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 UCC28019AD meets industry standards.
7.What is the process for return or replacement of UCC28019AD?
All UCC28019AD units undergo pre-shipment inspection (PSI). If there is an issue with UCC28019AD, 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 UCC28019AD part is unused and in its original packaging.
Return procedure for UCC28019AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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