My Inquiry
My Account
Texas Instruments UC2854J
- Part No.:
- UC2854J
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- -
- Datasheet:
-
UC2854J.pdf
- Description:
- UC2854M HIGH POWER FACTOR PREREG
- Quantity:
- Payment:
- Shipping:
Inventory:2,666
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UC2854J from Texas Instruments is a high-performance active power factor correction (PFC) controller IC designed for average current-mode boost preregulators. It delivers near-unity power factor, <3% line current distortion, fixed-frequency operation up to 200 kHz, 5 MHz current amplifier bandwidth, and integrated 7.5 V reference - enabling offline AC/DC front-end designs in industrial and telecom power supplies.
For engineers reviewing the UC2854J datasheet, UC2854J pinout, UC2854J application, or UC2854J equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain-ready availability details - all grounded in TI's SLUS329E datasheet and official ordering information.
Technical Context
The UC2854J implements average current-mode control using a precision analog multiplier with improved linearity (±1.0 A/A gain constant), VRMS input range extended to 0–5.5 V, and MOUT common-mode output swing of –0.3 V to 5.0 V - eliminating external zero-crossing compensation and zener clamps required by legacy UC3854 designs. Its current amplifier features 0 V typical input offset and 5 MHz bandwidth, enabling low-distortion 50/60 Hz and 400 Hz avionics PFC.
It integrates a 14 µA soft-start current source, 300 ns enable propagation delay, 1.5 A peak gate driver with 35 ns rise/fall times, and dual UVLO thresholds (10.5 V turn-on / 10 V turn-off) optimized for auxiliary 12-V startup. The RSET pin controls only oscillator charging current - decoupling timing from multiplier current limiting, which is now fixed at ≤2 × IAC for robust brownout foldback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO | 10.5 V turn-on / 10 V turn-off - enables reliable startup from 12-V auxiliary rails without external bias winding. |
| Oscillator Freq | 80–120 kHz typical - sets fixed switching frequency via RSET/CT; stable across line/temperature (±1%). |
| Current Amp BW | 5 MHz typical - ensures fast response to current transients and supports 400 Hz aerospace PFC applications. |
| Reference Voltage | 7.5 V ±1.5% - precision internal reference for voltage feedback, multiplier scaling, and PKLMT offset. |
| Gate Driver Output | 1.5 A peak, 12.8 V VOH @ 15 V VCC - drives MOSFET gates directly with minimal external components. |
| Startup Current | 250 µA typical - reduces power loss and resistor stress in high-voltage offline startup networks. |
| MULT Gain Const | –1.0 A/A typical - defines precise current command scaling between VRMS, VAO, and IAC inputs per K = –(VAO × VRMS²)/IAC. |
Pinout & Package
UC2854J is supplied in a 16-pin Ceramic Dual In-line Package (CDIP-J), rated for –40°C to +85°C operation, with SNPB lead finish and no RoHS compliance. Thermal resistance θJA = 80–120°C/W on FR4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power & signal reference | Common return for all analog/digital circuits; requires short, low-inductance connection to minimize noise coupling. |
| PKLMT (Pin 2) | Peak current limit threshold | Accepts negative-sense voltage from current shunt; 0 V threshold enables accurate overcurrent protection without external op-amp. |
| CAO (Pin 3) | Current amplifier output | Drives PWM comparator; 0.1–7.5 V swing allows full duty-cycle control while rejecting ground noise in differential configuration. |
| ISENSE (Pin 4) | Inverting current sense input | Connects to shunt low-side; functional down to –0.5 V, enabling direct sensing without level-shifting circuitry. |
| MOUT (Pin 5) | Multiplier output / CA+ input | High-impedance node combining multiplier result and current amp non-inverting input; IMOUT ≤ 2 × IAC ensures predictable foldback. |
| IAC (Pin 6) | Line voltage proportional current | Accepts 100 µA nominal current from VRMS divider; 500 mV internal offset eliminates external zero-crossing resistor. |
| VAO (Pin 7) | Voltage amplifier output | Clamped to 6.0 V internally; forms third multiplier input and replaces external zener clamp in UC3854 designs. |
| VRMS (Pin 8) | RMS line voltage input | 0–5.5 V linear range supports 85–270 VAC inputs with 1.5 V low-line calibration; enables true squaring vs. linear approximation. |
| VREF (Pin 9) | 7.5 V reference output | Stable bandgap reference powering internal blocks; VREF GOOD comparator prevents GTDRV activation until reference stabilizes. |
| ENA (Pin 10) | Enable input | 2.55 V nominal threshold with 600 mV hysteresis; internal 10 V clamp allows direct connection to microcontroller GPIO. |
| VSENSE (Pin 11) | Voltage feedback input | Inverting input to error amplifier; accepts optocoupler or resistive divider feedback for regulated DC bus control. |
| RSET (Pin 12) | Oscillator charge current set | Resistor-to-GND programs CT charging current only - no effect on multiplier current limit, simplifying design. |
| SS (Pin 13) | Soft-start capacitor | Internally sourced 14 µA current charges external cap; slow ramp of SS voltage controls gradual PWM duty increase. |
| CT (Pin 14) | Oscillator timing capacitor | Capacitor-to-GND sets switching frequency with RSET; 4.9–5.9 V ramp amplitude ensures stable oscillator operation. |
| VCC (Pin 15) | Supply voltage input | 10–20 V operating range; 20 V internal clamp permits current-fed startup; 18 mA typical operating current. |
| GTDRV (Pin 16) | Gate driver output | 1.5 A peak totem-pole output; requires ≥5 Ω series gate resistor to prevent overshoot when driving capacitive MOSFET gates. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates slope compensation requirement and maintains low THD (<3%) across universal AC input range. |
| Integrated 7.5 V reference | Stable, temperature-compensated reference with 25–60 mA short-circuit capability - powers internal blocks and external circuitry. |
| VREF GOOD comparator | Prevents GTDRV activation until VREF reaches regulation, removing need for external Schottky diodes on PKLMT/MOUT pins. |
| Enhanced multiplier linearity | –1.0 A/A gain constant with 500 mV IAC offset and 0–5.5 V VRMS range - improves PFC accuracy and eliminates discontinuities. |
| Low-offset current amplifier | 0 V typical input offset and 5 MHz bandwidth - minimizes line current distortion and supports 400 Hz avionics PFC. |
Applications
| Server Power Supply | Industrial Motor Drive |
|---|---|
Use Scenario: 1 kW–3 kW AC/DC front-end in rack-mounted servers requiring 80 PLUS Titanium compliance. IC Role / Device Role / Timing Role: Primary PFC controller managing boost stage; regulates input current waveform to match sinusoidal line voltage at 100 kHz. Use Value: Achieves >0.99 PF and <3% THD across 90–264 VAC, reducing upstream transformer and filter sizing while meeting EN 61000-3-2 Class A limits. | Use Scenario: Variable-frequency drive with regenerative braking requiring stable DC bus under fluctuating grid conditions. IC Role / Device Role / Timing Role: Active PFC controller in three-phase rectifier front-end; maintains unity PF during motor acceleration/deceleration cycles. Use Value: Enables bidirectional energy flow and reduces harmonic injection into factory mains, avoiding penalties under IEEE 519-2014 standards. |
| Telecom Rectifier | Medical Imaging PSU |
Use Scenario: -48 V DC telecom rectifier operating from 85–305 VAC with hold-up time >20 ms. IC Role / Device Role / Timing Role: High-bandwidth PFC controller coordinating with downstream LLC resonant converter; operates at 120 kHz for EMI optimization. Use Value: Delivers 96% peak efficiency and meets IEC 61000-3-12 for equipment >16 A, supporting dense packaging in 19-inch rack systems. | Use Scenario: MRI or CT scanner power system requiring ultra-low EMI and zero line-current discontinuity during rapid load steps. IC Role / Device Role / Timing Role: Precision PFC controller with 5 MHz current amplifier ensuring sub-1% current tracking error at 400 Hz line frequency. Use Value: Prevents image artifacts caused by harmonic distortion; enables compliance with IEC 60601-1-2 Ed. 4 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active power factor correction controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC2854BDW | Same core architecture and pinout, but in SOIC-16 (DW) package with NIPDAU RoHS-compliant finish; 0.5 mA higher quiescent current. | Surface-mount assembly; suitable for automated production but lacks CDIP's hermetic sealing and high-temp reliability. | Select UC2854BDW for volume SMT manufacturing where RoHS compliance and board space are priorities over extended temperature or harsh environment operation. |
| UC3854BQ | PLCC-20 package variant with identical electrical specs; includes additional NC pins and different thermal resistance (θJA = 43–75°C/W). | Higher I/O count margin for future expansion; better thermal performance on aluminum PCBs but requires re-layout due to 20-pin footprint. | Select UC3854BQ when thermal management on metal-core boards is critical and layout flexibility allows 20-pin PLCC integration. |
Compared with UC2854BDW and UC3854BQ, UC2854J offers superior high-temperature stability (–40°C to +85°C), hermetic CDIP packaging for mission-critical environments, and lower startup current - making it optimal for industrial and telecom infrastructure where long-term reliability outweighs RoHS or SMT constraints.
Availability
UC2854J is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, and telecom rectifiers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for UC2854J 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 power management solutions with emphasis on reliability, precision, and industrial-grade performance.
The UC2854J belongs to TI's UCx854 family of active PFC controllers, engineered specifically for high-efficiency, low-distortion AC/DC conversion in enterprise, industrial, and communications power systems.
FAQ
What is the operating temperature range for UC2854J?
The UC2854J is rated for operation from –40°C to +85°C ambient temperature, as confirmed in TI's SLUS329E datasheet Section "RECOMMENDED OPERATING CONDITIONS". This range applies specifically to the CDIP-J package version and supports deployment in industrial and telecom environments where thermal cycling and extended ambient extremes are common. The UC2854J's thermal resistance (θJA = 80–120°C/W) is specified for mounting on standard FR4 PCBs.
Does UC2854J require external slope compensation?
No, UC2854J does not require external slope compensation because it uses average current-mode control - a fundamental architectural difference from peak current-mode controllers. As stated in the datasheet's "FEATURES" section, average current mode "maintains stable, low distortion sinusoidal line current without the need for slope compensation". This eliminates two external op-amps and associated passive components traditionally needed with UC3854-based designs.
How does the UC2854J handle brownout conditions?
The UC2854J handles brownout conditions through fixed 2×IAC multiplier output current limiting and dual-threshold UVLO (10.5 V turn-on / 10 V turn-off). When line voltage drops, the reduced VRMS causes the multiplier output to scale down proportionally, while the hard clamp at 2×IAC ensures foldback power limiting - preventing excessive MOSFET conduction and thermal runaway. This behavior is explicitly documented in the "FUNCTIONAL DESCRIPTION" section of SLUS329E.
Can UC2854J be used in 400 Hz avionics PFC applications?
Yes, UC2854J is qualified for 400 Hz avionics PFC applications due to its 5 MHz current amplifier bandwidth and 0 V typical input offset voltage - both explicitly cited in the "FUNCTIONAL DESCRIPTION" section as enhancements over UC3854. These features ensure accurate current tracking and minimal THD even at 400 Hz line frequency, making UC2854J suitable for MIL-STD-704F compliant aircraft power systems.
What is the purpose of the RSET pin on UC2854J?
The RSET pin on UC2854J programs only the oscillator charging current - unlike UC3854, where RSET also affected multiplier current limiting. As clarified in the "FUNCTIONAL DESCRIPTION", this decoupling simplifies design: RSET now solely determines CT ramp rate and thus switching frequency, while multiplier output current is clamped independently to ≤2×IAC. This change improves brownout robustness and removes a key source of interaction between timing and current control loops.
UC2854J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Mode:
- -
- Frequency - Switching:
- -
- Current - Startup:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
UC2854J FAQ
1.How can I place an order for UC2854J through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2854J 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 UC2854J reliable?
The price and inventory of UC2854J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2854J is usually 5 days.
3.What payment methods are accepted for UC2854J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2854J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2854J?
UC2854J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2854J 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 UC2854J?
For technical support, including UC2854J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2854J requirements.
6.How does Aetrix verify that UC2854J is sourced from the original manufacturer or authorized distributors?
All UC2854J 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 UC2854J meets industry standards.
7.What is the process for return or replacement of UC2854J?
All UC2854J units undergo pre-shipment inspection (PSI). If there is an issue with UC2854J, 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 UC2854J part is unused and in its original packaging.
Return procedure for UC2854J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UC2854J 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…
