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Texas Instruments UC2854BJ
- Part No.:
- UC2854BJ
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- -
- Datasheet:
-
UC2854BJ.pdf
- Description:
- UC2854BM ENHANCED HIGH POWER FAC
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Product details
Overview
UC2854BJ from Texas Instruments is a high-power-factor preregulator IC implementing average current-mode control for boost-type active PFC stages. It integrates a 7.5-V precision voltage reference, analog multiplier/divider, voltage and current error amplifiers, fixed-frequency PWM, and 1-A totem-pole gate driver. Designed for universal-input (75–275 VAC) offline AC/DC supplies, it achieves 0.99 power factor and <5% line-current distortion in telecom and industrial power supplies.
For engineers reviewing the UC2854BJ datasheet, UC2854BJ pinout, UC2854BJ application, or UC2854BJ equivalent, key selection considerations include its 55 kHz typical oscillator frequency (RSET = 15 kΩ), –4 mV to +4 mV current amplifier offset, 70–100 dB voltage amplifier gain, 14.5 V max gate drive output, and SOIC-16 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The UC2854BJ employs average current-mode control-eliminating slope compensation and minimizing noise sensitivity-by comparing the sensed inductor current (via ISENSE/MULTOUT differential pair) against a sinusoidal reference derived from VRMS and VAOUT through the analog multiplier. Its feedforward line regulation uses VRMS input (1.5–3.5 V range) to dynamically scale the current command, maintaining stable output under wide input-voltage variation.
Internally, the device combines a 7.5-V reference (±15 mV load regulation), 1-A GTDRV output clamped to 15 V, and soft-start via SS pin (14 mA internal current source). The RSET pin programs both oscillator charging current and multiplier output limit, while PKLMT provides cycle-by-cycle peak current limiting at 0 V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator frequency | 55 kHz typical (RSET = 15 kΩ); sets fixed PWM switching frequency for EMI control and inductor sizing. |
| Voltage reference | 7.5 V ±0.15 V over temperature; powers external circuitry and serves as soft-start and error amplifier reference. |
| Gate driver output | 14.5 V max (18 V VCC); drives N-channel MOSFET gates directly with 1-A peak current and 35 ns rise/fall time. |
| Current amplifier offset | ±4 mV; ensures accurate zero-current detection during light-load or crossover conditions in average current mode. |
| Input voltage range (VRMS) | 1.5–3.5 V; enables feedforward line regulation to maintain constant output power across 75–275 VAC inputs. |
| Operating temperature | –40°C to +85°C; qualified for industrial-grade power supply environments without derating. |
| Supply voltage (VCC) | 10–20 V recommended; UVLO turn-on at 16 V typical, hysteresis 1 V - prevents erratic startup during brownout. |
Pinout & Package
UC2854BJ is housed in a 16-pin SOIC (DW package), 7.50 mm × 10.30 mm body size, with GND on Pin 1 and GTDRV on Pin 16. Thermal resistance RθJA = 71.5°C/W supports convection-cooled industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Reference ground | Common return for VCC, VREF bypass, CT discharge, and all analog/digital signals; requires low-inductance 0.1 µF ceramic capacitor. |
| PKLMT (2) | Peak current limit input | 0 V threshold comparator input; connects to negative side of current-sense resistor for cycle-by-cycle overcurrent shutdown. |
| CAOUT (3) | Current amplifier output | Emitter-follower output driving PWM comparator; swings to near GND to force zero duty cycle when needed. |
| ISENSE (4) | Current-sense inverting input | Differential input (with MULTOUT) for sensing boost inductor current; operates down to –0.3 V to reject ground noise. |
| MULTOUT (5) | Multiplier output / current-sense non-inverting input | High-impedance current output feeding CAOUT; also serves as +IN for current amplifier to enable differential sensing. |
| IAC (6) | AC line voltage feedforward input | Current-mode input (nominal 6 V bias) for RMS line sensing; cancels crossover distortion when biased via VREF. |
| VAOUT (7) | Voltage amplifier output | Regulated error amplifier output (0.5–5.8 V swing); feeds multiplier and remains active during disable for fast recovery. |
| VRMS (8) | RMS line voltage input | Analog feedforward input (1.5–3.5 V) scaling multiplier gain to maintain constant output power across line variations. |
| VREF (9) | 7.5 V reference output | Stable, short-circuit protected reference powering external circuits and internal soft-start/clamp functions. |
| ENA (10) | Enable logic input | Active-high TTL/CMOS input (2.55 V threshold); enables oscillator, reference, and PWM; not for high-speed shutdown. |
| VSENSE (11) | Voltage feedback inverting input | Connects to output divider network; senses regulated DC bus (e.g., 400 V) for closed-loop voltage control. |
| RSET (12) | Oscillator & multiplier limit set | Resistor-to-GND sets oscillator frequency and maximum multiplier output current (IMAX = 3.75 V / RSET). |
| SS (13) | Soft-start timing node | Internal 14 mA current source charges external capacitor; ramps VAOUT reference to prevent output overshoot at startup. |
| CT (14) | Oscillator timing capacitor | Capacitor-to-GND sets oscillator ramp amplitude (0.8–1.3 V valley, 4.9–5.9 V peak) and frequency stability. |
| VCC (15) | Positive supply input | 10–20 V operating range; powers all internal blocks; requires local 0.1 µF ceramic bypass to GND. |
| GTDRV (16) | Gate driver output | Totem-pole MOSFET driver (1 A peak); internally clamped to 15 V to protect gate oxide; needs ≥5 Ω series resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables stable, low-distortion sinusoidal line current without slope compensation across CCM/DCM transitions. |
| Feedforward line regulation | VRMS input scales multiplier gain in real time, maintaining constant output power over 75–275 VAC input range. |
| Integrated 7.5 V reference | ±0.15 V accuracy over temperature; supplies external bias and internal soft-start, reducing BOM count by one regulator. |
| 1-A totem-pole gate driver | Drives 10 nF gate capacitance with 35 ns edges; 15 V internal clamp prevents MOSFET gate overvoltage at high VCC. |
| Low-noise analog multiplier | –0.9 to –1.1 gain tolerance; accepts IAC current and VRMS/VSENSE-derived signals to generate precise current command. |
| Soft-start with SS pin | 14 mA internal current source charges external capacitor, controlling VAOUT ramp rate to eliminate output voltage overshoot. |
Applications
| Telecom Rectifier Systems | Industrial AC/DC Power Supplies |
|---|---|
|
Use Scenario: 3 kW telecom rectifier converting 85–264 VAC to –48 VDC with EN61000-3-2 Class D compliance. IC Role / Device Role / Timing Role: UC2854BJ serves as the active PFC controller in the front-end boost stage, regulating input current waveform to match sinusoidal voltage. Use Value: Achieves 0.99 PF and 3.81% THD at full load, enabling compliance with harmonic standards and reducing upstream transformer and cable losses. |
Use Scenario: 1.5 kW industrial PLC power supply requiring robust operation from –40°C to +85°C ambient. IC Role / Device Role / Timing Role: UC2854BJ implements average current-mode control with feedforward line regulation to maintain stable 400 VDC bus across wide input and load transients. Use Value: Delivers consistent performance without slope compensation or external noise filtering, reducing design iteration time and component count. |
| Medical Equipment Power Modules | Uninterruptible Power Supplies (UPS) |
|
Use Scenario: UL/IEC 60601-certified diagnostic imaging system power supply with strict EMI and reliability requirements. IC Role / Device Role / Timing Role: UC2854BJ controls the PFC boost stage to minimize harmonic injection into facility wiring, supporting clean downstream DC-DC conversion. Use Value: Low 4 mV current amplifier offset and high PSRR ensure accurate current regulation under noisy hospital electrical environments. |
Use Scenario: Online double-conversion UPS with bidirectional AC/DC and DC/AC stages requiring high-efficiency input rectification. IC Role / Device Role / Timing Role: UC2854BJ manages the input PFC stage to deliver regulated 400 VDC bus, enabling efficient inverter operation and battery charging. Use Value: 1-A gate driver and 55 kHz fixed frequency simplify magnetics design and thermal management in compact UPS enclosures. |
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 |
|---|---|---|---|
| UCC2854A | Lower VCC UVLO (10.5 V turn-on), 5 MHz current amplifier bandwidth vs. UC2854BJ's 1 MHz, 3 V VSENSE max vs. 7.5 V. | Optimized for lower-cost, higher-bandwidth designs where tighter current loop response is prioritized over wide VSENSE range. | Select UCC2854A when designing new industrial supplies targeting improved transient response and reduced VCC overhead. |
| ICE2PCS01 | Fixed-frequency CCM PFC controller with integrated 650 V startup circuit; no external RSET/CT required; 7.5 V reference absent. | Targets cost-sensitive consumer/IT power supplies; lacks UC2854BJ's analog multiplier flexibility and feedforward line regulation. | Choose ICE2PCS01 only for simplified, single-chip PFC solutions where programmability and precision line feedforward are not required. |
Compared with UCC2854A and ICE2PCS01, UC2854BJ offers broader VSENSE range (7.5 V), proven industrial temperature qualification, and full analog multiplier configurability-making it preferred for high-reliability, wide-input industrial and telecom PFC designs where design reuse and margin are critical.
Availability
UC2854BJ is available at Aetrix Electronics and suitable for telecom rectifiers, industrial AC/DC power supplies, medical equipment modules, and uninterruptible power supplies requiring stable component supply and long-term industrial temperature support.
Supply support for UC2854BJ 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 deep expertise in power conversion and industrial control ICs.
The UC2854BJ belongs to TI's UCx854 family of high-power-factor preregulators, designed specifically for average current-mode boost PFC in universal-input offline power supplies demanding >0.99 PF and EN61000-3-2 compliance.
FAQ
What is the operating temperature range of the UC2854BJ?
The UC2854BJ is rated for industrial operation from –40°C to +85°C junction temperature. This range is explicitly specified in the Recommended Operating Conditions table of the SLUS336A datasheet and distinguishes it from the military-grade UC1854 (–55°C to +125°C) and commercial UC3854 (0°C to +70°C). Designers must ensure PCB layout and airflow maintain junction temperature within this window under full-load conditions.
How does the UC2854BJ implement feedforward line regulation?
The UC2854BJ implements feedforward line regulation via the VRMS pin (Pin 8), which accepts a voltage proportional to the RMS input line voltage (1.5–3.5 V range). This signal scales the analog multiplier's gain in real time, causing the current command to increase or decrease proportionally with line voltage-thereby maintaining constant output power and minimizing output voltage deviation during line sags or surges. This function is independent of the voltage feedback loop.
What is the purpose of the RSET pin on the UC2854BJ?
The RSET pin (Pin 12) on the UC2854BJ serves a dual function: it sets the oscillator charging current (determining CT ramp rate and thus switching frequency) and limits the maximum multiplier output current. As specified in the datasheet, the multiplier output current does not exceed 3.75 V divided by the RSET-to-GND resistor value. For example, a 15 kΩ resistor yields ~250 µA max multiplier output and a 55 kHz oscillator frequency.
Can the UC2854BJ be used in discontinuous conduction mode (DCM)?
Yes, the UC2854BJ supports both continuous and discontinuous conduction mode (DCM) operation without performance degradation. Its average current-mode control architecture inherently maintains sinusoidal line current and stable regulation across mode transitions-unlike peak current-mode controllers that require slope compensation in DCM. This flexibility simplifies design for variable-load or wide-input applications where inductor current may naturally cross zero.
What is the maximum gate drive voltage provided by the UC2854BJ's GTDRV pin?
The UC2854BJ's GTDRV pin (Pin 16) provides a maximum gate drive voltage of 14.5 V under typical conditions (VCC = 15 V, –200 mA load), with an internal clamp limiting output to approximately 15 V regardless of VCC up to 35 V. This clamp protects N-channel MOSFET gates from overvoltage stress while allowing direct drive of standard logic-level FETs without external level-shifting circuitry.
UC2854BJ 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:
- -
UC2854BJ FAQ
1.How can I place an order for UC2854BJ through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2854BJ 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 UC2854BJ reliable?
The price and inventory of UC2854BJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2854BJ is usually 5 days.
3.What payment methods are accepted for UC2854BJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2854BJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2854BJ?
UC2854BJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2854BJ 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 UC2854BJ?
For technical support, including UC2854BJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2854BJ requirements.
6.How does Aetrix verify that UC2854BJ is sourced from the original manufacturer or authorized distributors?
All UC2854BJ 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 UC2854BJ meets industry standards.
7.What is the process for return or replacement of UC2854BJ?
All UC2854BJ units undergo pre-shipment inspection (PSI). If there is an issue with UC2854BJ, 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 UC2854BJ part is unused and in its original packaging.
Return procedure for UC2854BJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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