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Texas Instruments UC2854BDWG4
- Part No.:
- UC2854BDWG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC2854BDWG4.pdf
- Description:
- IC PFC CTR AVERAGE 120KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,201
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Product details
Overview
UC2854BDWG4 from Texas Instruments is a high-performance average current-mode power factor correction (PFC) controller IC designed for boost preregulator topologies. It delivers near-unity power factor, <3% line current distortion, fixed-frequency operation up to 200 kHz, and integrated 7.5-V reference with VREF GOOD monitoring - enabling robust PFC stages in AC/DC front-ends for industrial SMPS and server power supplies.
For engineers reviewing the UC2854BDWG4 datasheet, UC2854BDWG4 pinout, UC2854BDWG4 application, or UC2854BDWG4 equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, real-world soft-start behavior, and accurate alternative part comparisons for PFC controller selection.
Technical Context
The UC2854BDWG4 implements average current-mode control using a high-bandwidth (5 MHz) current amplifier and precision analog multiplier with improved linearity, eliminating slope compensation and reducing external component count. Its multiplier accepts IAC (line voltage proportional current), VRMS (RMS-sensed voltage), and VAO (voltage error amplifier output) to generate a sinusoidal current command.
It features dual UVLO thresholds (10.5 V turn-on / 10 V turn-off), internal 7.5-V reference with ±15 mV offset tolerance, 14-µA soft-start charge current, and a 1.5-A peak gate driver (GTDRV) optimized for MOSFET switching in continuous conduction mode (CCM) boost converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Turn-On/Off | 10.5 V / 10 V - enables startup from auxiliary 12-V rail without external bias supply |
| Reference Voltage | 7.5 V ±0.15 V - stable internal reference for multiplier scaling and fault detection |
| Oscillator Frequency | 80–120 kHz - fixed-frequency operation set by RSET/CT; supports 100 kHz nominal design |
| Current Amplifier GBW | 5 MHz - ensures low distortion at 400 Hz avionics inputs and fast transient response |
| Gate Driver Peak Current | 1.5 A - drives large MOSFET gates directly with minimal external buffering |
| Soft-Start Charge Current | 10–24 µA - controls ramp rate of SS pin to limit inrush during power-up |
| Input Offset Voltage (ISENSE) | ±5.5 mV max - minimizes line current harmonic distortion under full temperature range |
Pinout & Package
UC2854BDWG4 is housed in a 16-pin SOIC (DW) package with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and MSL Level-2 moisture sensitivity rating (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power & signal reference | Common return for all analog and power circuits; requires short, low-inductance PCB connection |
| 2 (PKLMT) | Peak current limit input | Accepts negative sense voltage from current-sense resistor; threshold = 0 V |
| 3 (CAO) | Current amplifier output | Drives PWM comparator; swings 0.1–7.5 V; serves as current command signal |
| 4 (ISENSE) | Inverting current sense input | High-impedance node for shunt-based current sensing; operates down to –0.5 V |
| 5 (MOUT) | Multiplier output / CA+ input | High-impedance current output; tied to CAO for differential current sensing; IMOUT ≤ 2×IAC |
| 6 (IAC) | Line voltage proportional current input | Accepts 0–250 µA current; internally regulated to 500 mV; eliminates zero-crossing compensation resistor |
| 7 (VAO) | Voltage amplifier output | Clamped to 6.0 V; third multiplier input; replaces external zener clamp |
| 8 (VRMS) | RMS line voltage input | 0–5.5 V linear range; enables accurate squaring for feedforward control |
| 9 (VREF) | 7.5-V reference output | Stable reference for internal circuits and external monitoring; sinks up to 60 mA |
| 10 (ENA) | Enable input | 2.35–2.80 V threshold; 600 mV hysteresis; disables device below 2.15 V |
| 11 (VSENSE) | Voltage feedback input | Connects to output divider; feeds voltage error amplifier; common-mode range includes GND |
| 12 (RSET) | Oscillator charging current set | Resistor to GND programs oscillator frequency; no effect on multiplier current limiting |
| 13 (SS) | Soft-start timing node | Internally charged at 14 µA; controls duty-cycle ramp; discharges rapidly on fault |
| 14 (CT) | Oscillator timing capacitor | Capacitor to GND sets frequency; ramp valley = 0.8–1.3 V, amplitude = 4.9–5.9 V |
| 15 (VCC) | Supply input | 10–20 V operating range; clamped at 22 V; 12–18 mA operating current |
| 16 (GTDRV) | Gate driver output | 1.5-A peak totem-pole output; rise/fall time ≤35 ns @ 1 nF; requires ≥5 Ω series gate resistor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VREF GOOD comparator | Prevents GTDRV activation until 7.5-V reference stabilizes - eliminates need for external Schottky diodes on PKLMT/MOUT |
| Enhanced multiplier linearity | Gain constant –1.1 to –0.9 A/A with <500 mV VRMS offset - reduces THD without external trimming |
| Low-offset current amplifier | ±5.5 mV max input offset over temperature - maintains <3% line current distortion across –40°C to +85°C |
| UVLO dual-threshold option | 10.5 V turn-on / 10 V turn-off - supports direct startup from 12-V auxiliary supply in offline systems |
| Internal 6-V clamp on VAO | Replaces external zener diode - simplifies compensation network and improves reliability |
| 250 µA typical start-up current | Reduces power loss in high-voltage startup resistors - extends hold-up time in brownout conditions |
Applications
| Industrial AC/DC Power Supplies | Server & Telecom Rectifiers |
|---|---|
Use Scenario: 3 kW CCM boost PFC stage in 3-phase rectified input system with 85–270 VAC universal input. IC Role / Device Role / Timing Role: Primary PFC controller generating sinusoidal input current via average current-mode control and RMS feedforward. Use Value: Achieves >0.99 PF and <3% THD at full load while supporting 100 kHz switching with minimal external components. |
Use Scenario: Front-end PFC module in 48 V telecom rectifier with active hold-up and dynamic line regulation. IC Role / Device Role / Timing Role: Voltage-mode referenced current shaper coordinating with downstream DC/DC controllers via shared VREF. Use Value: Enables seamless transition between AC and battery backup via VREF GOOD signaling and fast disable propagation (<300 ns). |
| Medical Equipment Power Modules | Avionics 400 Hz PFC Converters |
Use Scenario: EMI-sensitive diagnostic imaging power supply requiring low-noise, low-distortion input current. IC Role / Device Role / Timing Role: Precision current command generator using high-GBW current amplifier and clamped VAO path. Use Value: Delivers <2.5% line current distortion at 60 Hz and suppresses sub-harmonic noise through fixed-frequency averaging. |
Use Scenario: 400 Hz aircraft ground power interface with wide input voltage range and rapid transient response. IC Role / Device Role / Timing Role: High-bandwidth PFC controller leveraging 5 MHz current amplifier for 400 Hz fundamental tracking. Use Value: Maintains <3% THD and stable regulation even during 400 Hz line sags due to enhanced amplifier bandwidth and foldback limiting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power factor correction controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC2854ADWG4 | 16 V/10 V UVLO; higher turn-on threshold requires dedicated high-voltage startup circuit | Better suited for direct AC-line startup in offline designs without auxiliary supply | Select when primary supply is derived directly from rectified AC and no 12-V rail exists |
| UC3854BDWG4 | 0°C to 70°C operating range; identical pinout and electrical specs but lower temp grade | Targeted at commercial-grade equipment where extended industrial temperature is not required | Select for cost-sensitive telecom or consumer applications with ambient <70°C |
Compared with UC2854ADWG4, UC2854BDWG4 enables simpler auxiliary-supply startup and lower standby loss; compared with UC3854BDWG4, it supports wider industrial temperature operation critical for factory automation and outdoor power systems.
Availability
UC2854BDWG4 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, server rectifiers, and medical power modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for UC2854BDWG4 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 and embedded processing solutions with emphasis on power management, signal chain, and high-reliability ICs.
The UC2854B product line was engineered specifically for high-efficiency, low-distortion active power factor correction in industrial and enterprise power systems - emphasizing thermal stability, startup robustness, and integration to reduce bill-of-materials.
FAQ
What is the operating temperature range for UC2854BDWG4?
The UC2854BDWG4 is rated for –40°C to +85°C junction temperature, making it suitable for industrial environments including factory automation, outdoor power systems, and enclosed server chassis where ambient temperatures exceed commercial-grade limits. This range is confirmed in TI's SLUS329E datasheet Section 5, Recommended Operating Conditions.
Does UC2854BDWG4 require external slope compensation?
No, UC2854BDWG4 does not require external slope compensation because it uses average current-mode control architecture. The internal current amplifier directly senses and regulates inductor current waveform, inherently stabilizing the control loop without added ramp injection - a key differentiator from peak current-mode controllers.
How does the UC2854BDWG4 handle brownout conditions?
The UC2854BDWG4 implements foldback power limiting during brownout via automatic clamping of IMOUT to 2 × IAC, independent of RSET. This ensures controlled reduction of input current without oscillation or latch-up, preserving system stability when VCC drops near UVLO turn-off (10 V) - a feature explicitly documented in the Functional Description section of SLUS329E.
Can UC2854BDWG4 drive a 1000-pF gate capacitance directly?
Yes, UC2854BDWG4's GTDRV pin delivers 1.5-A peak current with ≤35 ns rise/fall times into 1 nF loads per datasheet Figure 2. For 1000-pF (1 nF), it meets timing requirements; however, a minimum 5-Ω series gate resistor is mandatory to prevent overshoot and ringing caused by trace inductance interacting with the driver's low output impedance.
What is the purpose of the VREF GOOD comparator in UC2854BDWG4?
The VREF GOOD comparator in UC2854BDWG4 monitors the 7.5-V internal reference and holds GTDRV low until VREF reaches regulation. This prevents premature MOSFET switching during power-up, eliminating the need for external Schottky diodes on PKLMT and MOUT pins - a documented reliability enhancement over UC3854 designs per SLUS329E Section 8.
UC2854BDWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Mode:
- Average Current
- Frequency - Switching:
- 80kHz ~ 120kHz
- Current - Startup:
- 250 µA
- Voltage - Supply:
- 10V ~ 20V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UC2854BDWG4 FAQ
1.How can I place an order for UC2854BDWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2854BDWG4 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 UC2854BDWG4 reliable?
The price and inventory of UC2854BDWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2854BDWG4 is usually 5 days.
3.What payment methods are accepted for UC2854BDWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2854BDWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2854BDWG4?
UC2854BDWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2854BDWG4 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 UC2854BDWG4?
For technical support, including UC2854BDWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2854BDWG4 requirements.
6.How does Aetrix verify that UC2854BDWG4 is sourced from the original manufacturer or authorized distributors?
All UC2854BDWG4 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 UC2854BDWG4 meets industry standards.
7.What is the process for return or replacement of UC2854BDWG4?
All UC2854BDWG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC2854BDWG4, 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 UC2854BDWG4 part is unused and in its original packaging.
Return procedure for UC2854BDWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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