My Inquiry
My Account
Texas Instruments UCC3819AD
- Part No.:
- UCC3819AD
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC3819AD.pdf
- Description:
- IC PFC CTR AVERAGE 250KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,826
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UCC3819AD 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 world-wide line operation with over-voltage protection.
For engineers reviewing the UCC3819AD datasheet, UCC3819AD pinout, UCC3819AD application, or UCC3819AD equivalent, this page provides verified technical context, confirmed pin functions, real-world PFC design implications of its tracking boost capability, and validated alternative options for industrial and telecom power supply development.
Technical Context
The UCC3819AD integrates a voltage error amplifier with externally accessible non-inverting input (VAI), a current amplifier with CAI/MOUT differential sensing, and an analog multiplier with IAC/VFF feed-forward inputs to shape line current. Its leading-edge modulation reduces bulk capacitor ripple, while zero-power comparator enables low-line efficiency optimization.
It uses a resistor-capacitor oscillator (RT/CT) to set switching frequency (typ. 100 kHz), includes UVLO with 10.2 V turn-on threshold and 0.5 V hysteresis, and delivers regulated 7.5 V reference (±13 mV accuracy) capable of sourcing 20 mA. The gate driver features 9 Ω pull-up and 4 Ω pull-down resistances for robust MOSFET interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 10.8 V to 17 V - ensures stable operation across universal AC input-derived bias rails |
| Gate Drive Peak Current | ±1.2 A - directly drives medium-power MOSFETs without external buffers in <2 kW PFC stages |
| Reference Voltage | 7.5 V ±13 mV - precision internal reference for feedback loop stability and accurate OVP thresholds |
| Oscillator Frequency | 80–120 kHz - programmable via RT/CT; supports EMI filtering and inductor size optimization |
| Start-Up Current | 150 µA typical - enables low-loss auxiliary startup circuits in high-efficiency offline supplies |
| UVLO Threshold | 10.2 V turn-on / 9.7 V turn-off - prevents erratic operation during brownout or cold-start conditions |
| Output Voltage Programming | VAI pin accepts 0–7.5 V - enables dynamic tracking boost where output scales with RMS line voltage |
Pinout & Package
UCC3819AD is housed in a 16-pin SOIC (D) package with standard 1.27 mm pitch, 10.3 mm × 6.5 mm body, and 1.75 mm max height per JEDEC MO-153. Thermal resistance is θJA = 40–70 °C/W on FR4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Power and signal reference ground | Common return for all analog and power sections; must be low-impedance star point |
| PKLMT (2) | Peak current limit threshold input | Sets instantaneous boost switch current limit by comparing sense resistor voltage to 0 V reference |
| CAOUT (3) | Current amplifier output | Drives PWM latch; connects to compensation network and MOUT for loop stability |
| CAI (4) | Current amplifier non-inverting input | Connects to low-side current-sense resistor; functional down to GND for bidirectional sensing |
| MOUT (5) | Multiplier output / current amp inverting input | High-impedance node combining multiplier current and CAI feedback; enables leading-edge modulation |
| IAC (6) | Line voltage proportional current input | Accepts up to 500 µA current representing instantaneous AC line voltage for distortion-free shaping |
| VAOUT (7) | Voltage error amplifier output | Regulates boost output voltage; clamped at ~5.5 V to prevent overshoot during transients |
| VFF (8) | Feed-forward RMS voltage output | Provides scaled line voltage signal to multiplier; sets VFF roll to 14 V at low line for gain stability |
| VREF (9) | 7.5 V precision reference output | Sources up to 20 mA; disabled below UVLO; bypassed with ≥0.1 µF ceramic for noise immunity |
| OVP/EN (10) | Over-voltage protection and enable input | Window comparator: disables driver above programmed OVP level or below 1.9 V enable threshold |
| VSENSE (11) | Voltage amplifier inverting input | Connects to output divider network; forms feedback path with VAI for closed-loop regulation |
| RT (12) | Oscillator timing resistor input | Programs charging current; 10–100 kΩ recommended; nominal 3 V bias for frequency accuracy |
| VAI (13) | Voltage amplifier non-inverting input | Enables tracking boost: tie to VFF to scale output voltage with line RMS, reducing inductor stress |
| CT (14) | Oscillator timing capacitor input | Capacitor to GND sets frequency; short direct trace required to minimize noise coupling |
| VCC (15) | Positive supply input | Requires ≥20 mA capability; bypassed directly to GND with ≥0.1 µF ceramic to absorb gate charge spikes |
| DRVOUT (16) | Gate driver output | Totem-pole MOSFET driver; series gate resistor (e.g., 11 Ω) recommended to damp ringing |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Enables low-distortion sinusoidal line current draw with inherent stability and wide bandwidth |
| Programmable tracking boost via VAI | Allows output voltage to scale with line RMS-reducing boost inductor size and MOSFET conduction losses at low line |
| Leading-edge modulation | Reduces ripple current in bulk capacitor, lowering thermal stress and enabling smaller electrolytic selection |
| Low 150 µA start-up current | Minimizes auxiliary supply losses during cold start, improving no-load efficiency in energy-sensitive designs |
| Integrated 7.5 V reference with 20 mA drive | Eliminates need for external reference; powers OVP circuitry, bias networks, and divider strings reliably |
| Over-voltage protection with hysteresis | Protects downstream converters by disabling DRVOUT when output exceeds safe threshold (±500 mV hysteresis) |
Applications
| Server Power Supply Front-End | Industrial AC-DC Rectifier |
|---|---|
Use Scenario: 1 kW redundant power supply in data center rack requiring >98% efficiency and EN 61000-3-2 Class A compliance. IC Role / Device Role / Timing Role: UCC3819AD acts as the primary PFC controller, regulating boost stage to achieve near-unity power factor and low THD. Use Value: Tracking boost configuration lowers MOSFET conduction loss at 90 VAC input, improving full-load efficiency by 0.4% versus fixed-output PFC. |
Use Scenario: 800 W motor drive power module operating from 3-phase 400 VAC industrial mains. IC Role / Device Role / Timing Role: UCC3819AD controls single-phase boost preregulator feeding DC link; handles wide input range and transient surges. Use Value: Over-voltage protection prevents damage during regenerative braking events; 10.2 V UVLO ensures reliable restart after brownouts. |
| Telecom Rectifier Shelf | Medical Imaging Power System |
Use Scenario: -48 VDC telecom rectifier with hot-swap capability and strict hold-up time requirements. IC Role / Device Role / Timing Role: UCC3819AD manages boost converter to generate stable 380 VDC bus from 85–264 VAC input. Use Value: Low 150 µA start-up current allows use of high-value startup resistor, extending hold-up time during AC dropout. |
Use Scenario: CT scanner power subsystem requiring ultra-low EMI and high reliability under continuous duty cycle. IC Role / Device Role / Timing Role: UCC3819AD implements average current mode PFC with feed-forward line regulation to suppress harmonic injection. Use Value: Improved noise immunity and feed-forward line regulation reduce conducted EMI by 8 dBµV in 150 kHz–30 MHz band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2819AD | Same architecture but rated for −40°C to 85°C; VREF tolerance tighter (±13.1 mV vs ±13 mV); identical pinout and function | Required for extended temperature industrial or outdoor deployments; not suitable for commercial 0°C–70°C only designs | Select UCC2819AD when ambient operating temperature exceeds 70°C or falls below 0°C |
| UC3854A | Different process (bipolar vs BiCMOS); higher start-up current (300 µA); no VAI pin; requires external reference; 16-pin DIP/SOIC compatible | Lacks tracking boost capability; less efficient at light load due to higher quiescent current; used in legacy telecom designs | Choose UC3854A only for drop-in replacement in existing UC3854-based boards with no VAI dependency |
Compared with UCC3819AD, UCC2819AD extends temperature range without sacrificing performance, while UC3854A offers legacy compatibility at the cost of higher power consumption and reduced feature set-making UCC3819AD optimal for new commercial-grade PFC designs prioritizing efficiency and dynamic output control.
Availability
UCC3819AD is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC rectifiers, telecom rectifier shelves, and medical imaging power systems requiring stable component supply and long-term design continuity.
Supply support for UCC3819AD 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 innovation in power conversion ICs.
The UCC3819AD belongs to TI's BiCMOS PFC controller product line, engineered specifically for high-efficiency, low-THD active power factor correction in universal-input AC-DC power supplies up to 2 kW.
FAQ
What is the operating temperature range for the UCC3819AD?
The UCC3819AD is specified for operation from 0°C to 70°C ambient temperature. This commercial-grade rating is confirmed in the Available Options Table and Absolute Maximum Ratings section of the SLUS579 datasheet. Operation outside this range may result in parametric deviation or functional failure; for extended temperature use, the UCC2819AD (−40°C to 85°C) is the qualified alternative. The UCC3819AD thermal characteristics assume standard SOIC-D mounting on FR4 PCB.
Does the UCC3819AD support tracking boost output voltage?
Yes, the UCC3819AD supports tracking boost 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 differentiates UCC3819AD from earlier UCC3818 and enables dynamic output regulation not possible with fixed-reference controllers like UC3854A. The UCC3819AD datasheet Figure 1 confirms this implementation.
What is the purpose of the PKLMT pin on the UCC3819AD?
The PKLMT (peak current limit) pin on the UCC3819AD serves as the threshold input for instantaneous boost switch current limiting. It compares the voltage across the current-sense resistor to a 0 V reference-triggering current foldback when the sensed voltage drops below 0 V. This allows precise, temperature-stable peak current control using a simple resistor divider from the sense resistor's negative side to VREF. The UCC3819AD datasheet Pin Descriptions section explicitly defines PKLMT as "threshold for peak limit is 0 V."
Can the UCC3819AD replace the UCC3819 in existing designs?
Yes, the UCC3819AD is pin-for-pin compatible with the legacy UCC3819, as stated in the datasheet: "The UCC3819A is directly pin for pin compatible with the UCC3819." The only modification is an enhanced output stage enabling lower external gate drive resistor values-improving robustness in high-current gate drive scenarios. No PCB changes are required, and all peripheral components (RT, CT, compensation networks) remain unchanged. The UCC3819AD maintains identical electrical specifications except for improved noise immunity and feed-forward line regulation.
What packaging options are available for the UCC3819AD?
The UCC3819AD is offered exclusively in the 16-pin SOIC (D) package, as confirmed in the Available Options Table and PACKAGE OPTION ADDENDUM. It is supplied in tubes of 40 units; tape-and-reel ordering requires the R-suffixed variant UCC3819ADR (2500 per reel). The D package has JEDEC MO-153 outline, 1.27 mm lead pitch, and RoHS-compliant NiPdAu (NIPDAU) finish with MSL Level-1 rating. No TSSOP (PW) or PDIP (N) variants exist for the UCC3819AD-those are reserved for UCC2819A and UCC3819A family members with different temperature grades.
UCC3819AD 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UCC3819AD FAQ
1.How can I place an order for UCC3819AD through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3819AD 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 UCC3819AD reliable?
The price and inventory of UCC3819AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3819AD is usually 5 days.
3.What payment methods are accepted for UCC3819AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3819AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3819AD?
UCC3819AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3819AD 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 UCC3819AD?
For technical support, including UCC3819AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3819AD requirements.
6.How does Aetrix verify that UCC3819AD is sourced from the original manufacturer or authorized distributors?
All UCC3819AD 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 UCC3819AD meets industry standards.
7.What is the process for return or replacement of UCC3819AD?
All UCC3819AD units undergo pre-shipment inspection (PSI). If there is an issue with UCC3819AD, 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 UCC3819AD part is unused and in its original packaging.
Return procedure for UCC3819AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCC3819AD Tags
-
ICE2PCS01GXUMA1
Infineon Technologies
-
NCP1654BD133R2G
onsemi
-
MC33262DR2G
onsemi
-
ICE3PCS03GXUMA1
Infineon Technologies
-
NCP1631DR2G
onsemi
-
L4981BD013TR
STMicroelectronics
-
UCC28070DWR
Texas Instruments
-
UCC28070PWR
Texas Instruments
-
UC3854DWTR
Texas Instruments
-
L4981AD013TR
STMicroelectronics
-
UCC2817D
Texas Instruments
-
UC2854BDWTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
