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Texas Instruments UC3854DWTR-F
- Part No.:
- UC3854DWTR-F
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC3854DWTR-F.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,691
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Product details
Overview
UC3854DWTR-F from Texas Instruments is a high-power-factor preregulator controller IC for active PFC boost converters, implementing average current-mode control with 7.5-V precision reference, 55-kHz fixed-frequency PWM, and 1-A totem-pole gate driver. It achieves 0.99 power factor and <5% line-current distortion in universal-input (75–275 VAC) offline AC/DC supplies delivering up to 400 VDC output.
For engineers reviewing the UC3854DWTR-F datasheet, UC3854DWTR-F pinout, UC3854DWTR-F application, or UC3854DWTR-F equivalent, key selection considerations include its SOIC-16 package, VCC UVLO threshold of 16 V, 70°C operating junction temperature, feedforward line regulation via VRMS, and compatibility with boost topologies requiring stable average-current control without slope compensation.
Technical Context
The UC3854DWTR-F integrates a voltage amplifier (100-dB gain, 0.5–5.8 V output swing), analog multiplier/divider with programmable IAC input and RSET-limited output, and a wideband current amplifier (1-MHz bandwidth, ±4-mV offset) that remains active during disable cycles. Its oscillator uses CT and RSET to set frequency (46–62 kHz), while GTDRV delivers clamped 14.5-V gate drive with 35-ns rise/fall time into 1-nF load.
It employs feedforward RMS line sensing (VRMS input, 1.5–3.5 V range) and soft-start via SS pin (14-mA internal current source), enabling controlled ramp-up of duty cycle. The device supports world-wide operation (50–400 Hz line frequency) and maintains sinusoidal input current without slope compensation due to true average current-mode architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 10–20 V - powers internal circuitry and gate driver; UVLO turn-on at 16 V ensures reliable startup after bulk capacitor charging. |
| Oscillator Frequency | 55 kHz typical (RSET = 15 kΩ) - sets fixed switching frequency for EMI filtering and inductor sizing in boost PFC stages. |
| Voltage Reference | 7.5 V ±0.15 V over temperature - provides stable bias for feedback networks, multiplier, and soft-start; delivers 10 mA. |
| Gate Driver Output | 14.5 V max, 1-A peak - directly drives N-channel MOSFET gates in boost switch position; internally clamped to prevent overvoltage. |
| Current Amplifier BW | 1 MHz typical - enables fast response to line-current transients while maintaining stability in average current-mode control loop. |
| Power Factor | 0.99 typical - achieved via feedforward line regulation and precise analog multiplier, meeting EN61000-3-2 Class D limits. |
| THD | <5% - low harmonic distortion ensures compliance in medical, telecom, and industrial power supplies ≥75 W. |
Pinout & Package
UC3854DWTR-F is housed in a 16-pin SOIC (DW) package measuring 7.50 mm × 10.30 mm, with GND on Pin 1, GTDRV on Pin 16, and VREF on Pin 9. Thermal resistance RθJA is 71.5°C/W, suitable for moderate-power PFC designs with standard PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Reference ground | Common return for VCC, VREF, CT, and timing capacitor discharge path; requires short, low-inductance trace to minimize noise coupling. |
| PKLMT (Pin 2) | Peak current limit input | Accepts negative voltage from current-sense resistor; triggers immediate PWM shutdown when pulled below 0 V to protect MOSFET during overload. |
| CAOUT (Pin 3) | Current amplifier output | Drives PWM comparator; swings to near-GND to force zero duty cycle; remains active during disable for fast recovery. |
| ISENSE (Pin 4) | Current-sense inverting input | Connects to low-side current-sense resistor; accepts signals down to –0.3 V; differential use with MULTOUT rejects ground noise. |
| MULTOUT (Pin 5) | Multiplier output / current-sense non-inverting input | Outputs scaled line-current command; also serves as CA+ input; high-impedance node requiring careful layout to avoid noise pickup. |
| IAC (Pin 6) | AC line current input | Current-mode input to analog multiplier; nominal 6-V bias enables zero-crossing distortion cancellation when referenced to VREF. |
| VAOUT (Pin 7) | Voltage amplifier output | Regulates boost output voltage; clamped to ~5.8 V; remains active during disable to preserve feedback capacitor charge. |
| VRMS (Pin 8) | RMS line voltage feedforward | Compensates for input line variations; must be held between 1.5 V and 3.5 V to maintain stable output regulation across universal AC input. |
| VREF (Pin 9) | 7.5-V precision reference output | Stable bias for external resistors (e.g., VRMS divider, PKLMT offset); disabled when VCC < UVLO or ENA = low. |
| ENA (Pin 10) | Enable logic input | Active-high enable for PWM, oscillator, and reference; releases SS clamp when asserted; not intended for high-speed shutdown. |
| VSENSE (Pin 11) | Voltage amplifier inverting input | Connects to output voltage divider; high-impedance node (±25 nA bias current); sets regulated output voltage via feedback ratio. |
| RSET (Pin 12) | Oscillator/Multiplier set resistor | Resistor to GND programs both oscillator frequency and maximum multiplier output current (IMAX = 3.75 V / RRSET). |
| SS (Pin 13) | Soft-start timing node | Internally sourced 14-mA current charges external capacitor; controls ramp rate of voltage reference to VAOUT, preventing output overshoot. |
| CT (Pin 14) | Oscillator timing capacitor | Capacitor to GND sets oscillator frequency; CT ramp amplitude is 4.9–5.9 V peak-to-valley, driving PWM comparator threshold. |
| VCC (Pin 15) | Positive supply input | Requires ≥20 mA supply above 17 V; bypassed with ≥0.1 µF ceramic cap to GND; inhibits operation if below UVLO threshold. |
| GTDRV (Pin 16) | Gate driver output | Drives boost MOSFET gate; clamped to 15 V; requires ≥5 Ω series resistor to damp ringing and prevent overshoot on capacitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables stable, low-distortion sinusoidal line current without slope compensation-critical for EN61000-3-2 compliance in 75–250 W systems. |
| Feedforward line regulation (VRMS) | Reduces output voltage variation caused by AC line fluctuations, improving transient response and reducing need for large output capacitance. |
| 1-A totem-pole gate driver | Directly drives medium-size MOSFETs in boost switch position without external driver, simplifying layout and reducing component count. |
| 7.5-V precision reference (VREF) | Provides accurate, temperature-stable bias for all internal analog blocks and external feedback networks-eliminates need for external reference. |
| Soft-start with SS pin | Prevents inrush current and output overshoot via controlled ramp of voltage amplifier reference; internal 14-mA current source simplifies design. |
Applications
| Industrial Power Supplies | Medical AC/DC Converters |
|---|---|
Use Scenario: 250-W universal-input front-end for DIN-rail mounted PLC power modules operating from 85–264 VAC. IC Role / Device Role / Timing Role: UC3854DWTR-F acts as the active PFC controller in continuous-conduction-mode boost stage, regulating 400 VDC bus while enforcing sinusoidal input current. Use Value: Achieves 0.999 PF and 3.81% THD per EN61000-3-2 Class D, enabling compact thermal design and eliminating need for passive harmonic filters. |
Use Scenario: Offline power supply for diagnostic imaging equipment requiring low EMI and high reliability under variable line conditions. IC Role / Device Role / Timing Role: UC3854DWTR-F implements feedforward-regulated average current-mode control to maintain tight output regulation and low harmonic injection into hospital mains. Use Value: Delivers stable 400 VDC bus with <5% THD across 50–400 Hz line frequencies, supporting critical safety-critical downstream DC/DC conversion. |
| Telecom Rectifiers | Uninterruptible Power Supplies |
Use Scenario: 3 kW telecom rectifier system using interleaved boost PFC stages where each UC3854DWTR-F controls one phase. IC Role / Device Role / Timing Role: UC3854DWTR-F serves as the dedicated PFC controller per boost leg, coordinating with master clock for interleaving and minimizing input ripple. Use Value: Enables high-efficiency (>95%) front-end with minimal line-current distortion, reducing upstream transformer and breaker sizing requirements. |
Use Scenario: Line-interactive UPS with bidirectional PFC capability, where UC3854DWTR-F manages boost-mode charging and regeneration. IC Role / Device Role / Timing Role: UC3854DWTR-F regulates boost converter during AC-line mode, ensuring unity power factor and clean input current during battery recharge cycles. Use Value: Supports seamless transition between line and battery modes while maintaining EN61000-3-2 compliance and minimizing generator loading harmonics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active power factor correction applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC3854D | Same SOIC-16 footprint and pinout; improved VCC UVLO (10.5 V turn-on), lower quiescent current (400 µA vs 2 mA), and higher current amplifier bandwidth (5 MHz). | Preferred for low-power or energy-sensitive designs where faster transient response and lower standby loss are required. | Select UCC3854D when upgrading legacy UC3854DWTR-F designs for efficiency or wider input-voltage startup range. |
| ICE3PCS01G | Fixed-frequency CCM PFC controller in PG-DSO-16; includes integrated 650-V startup circuit and zero-crossing detector; no external VREF or RSET needed. | Targets cost-sensitive consumer/IT power supplies; lacks UC3854DWTR-F's analog multiplier flexibility and feedforward VRMS input. | Choose ICE3PCS01G for simplified BOM and reduced external components in non-critical industrial applications where full analog control is unnecessary. |
Compared with UCC3854D and ICE3PCS01G, UC3854DWTR-F offers superior analog signal fidelity and design flexibility for high-accuracy PFC in medical and telecom systems, but requires more external components and has higher startup current than newer alternatives.
Availability
UC3854DWTR-F is available at Aetrix Electronics and suitable for industrial power supplies, medical AC/DC converters, telecom rectifiers, uninterruptible power supplies, and appliance front-ends requiring stable component supply and long-term manufacturability.
Supply support for UC3854DWTR-F 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 power conversion ICs.
The UC3854DWTR-F belongs to TI's legacy UCx854 family of high-power-factor preregulator controllers, designed specifically for average current-mode boost PFC in universal-input offline power supplies targeting EN61000-3-2 compliance.
FAQ
What is the operating temperature range for the UC3854DWTR-F?
The UC3854DWTR-F is rated for an operating junction temperature range of 0°C to 70°C, making it suitable for commercial and industrial ambient environments where thermal management is controlled via PCB copper and airflow. This differs from the UC2854 (–40°C to 85°C) and UC1854 (–55°C to 125°C) variants, confirming its intended use in non-extended-temperature applications. Always verify thermal design margins using RθJA = 71.5°C/W.
How does the UC3854DWTR-F achieve power factor correction without slope compensation?
The UC3854DWTR-F uses average current-mode control-not peak current-mode-so it inherently avoids subharmonic oscillation and eliminates the need for slope compensation. Its current amplifier continuously measures and regulates the average inductor current waveform, forcing it to track the sinusoidal shape of the rectified AC line voltage. This architecture, combined with feedforward VRMS input, enables stable 0.99 PF operation across universal input ranges without external compensation networks.
Can the UC3854DWTR-F be used in discontinuous conduction mode (DCM) boost PFC?
Yes-the UC3854DWTR-F supports both continuous and discontinuous conduction mode boost topologies. Its average current-mode architecture maintains stable control and low THD regardless of conduction mode transitions, unlike peak current-mode controllers that require re-tuning or slope compensation when crossing the boundary. Designers can select inductor value based on power level and efficiency targets without compromising UC3854DWTR-F's core functionality.
What is the purpose of the VRMS pin on the UC3854DWTR-F?
The VRMS pin on the UC3854DWTR-F provides feedforward line-voltage regulation by accepting a DC voltage proportional to the RMS input line voltage (1.5–3.5 V range). This signal is squared internally and applied to the analog multiplier's divider input, allowing the UC3854DWTR-F to dynamically adjust current reference magnitude in real time-reducing output voltage variation during line sags or surges and improving transient response without increasing output capacitance.
Is the UC3854DWTR-F pin-compatible with the UC3854D or UCC3854D?
No-UC3854DWTR-F (SOIC-16, DW package) shares identical pinout and function mapping with UC3854D and UCC3854D in the same DW package, but electrical differences exist: UC3854DWTR-F has 2-mA OFF supply current and 16-V VCC UVLO, while UCC3854D specifies 400-µA OFF current and 10.5-V UVLO. Direct substitution requires validation of startup behavior and quiescent power in the target system.
UC3854DWTR-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Mode:
- Average Current
- Frequency - Switching:
- 200kHz
- Current - Startup:
- 1.5 mA
- Voltage - Supply:
- 14.5V ~ 30V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UC3854DWTR-F FAQ
1.How can I place an order for UC3854DWTR-F through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3854DWTR-F 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 UC3854DWTR-F reliable?
The price and inventory of UC3854DWTR-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3854DWTR-F is usually 5 days.
3.What payment methods are accepted for UC3854DWTR-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3854DWTR-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3854DWTR-F?
UC3854DWTR-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3854DWTR-F 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 UC3854DWTR-F?
For technical support, including UC3854DWTR-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3854DWTR-F requirements.
6.How does Aetrix verify that UC3854DWTR-F is sourced from the original manufacturer or authorized distributors?
All UC3854DWTR-F 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 UC3854DWTR-F meets industry standards.
7.What is the process for return or replacement of UC3854DWTR-F?
All UC3854DWTR-F units undergo pre-shipment inspection (PSI). If there is an issue with UC3854DWTR-F, 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 UC3854DWTR-F part is unused and in its original packaging.
Return procedure for UC3854DWTR-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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