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Texas Instruments UC2854BMDWREP
- Part No.:
- UC2854BMDWREP
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC2854BMDWREP.pdf
- Description:
- IC PFC CTR AVERAGE 120KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,943
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Product details
Overview
UC2854BMDWREP from Texas Instruments is an enhanced radiation-tolerant active power factor correction (PFC) controller IC for high-reliability boost preregulators. It implements fixed-frequency average current-mode control, delivers <3% line current distortion, integrates a 7.5-V reference with VREF GOOD monitoring, and supports world-wide 80–270 VAC input operation without hardware switches. It targets industrial lighting and aerospace avionics requiring −55°C to 125°C operation.
For engineers reviewing the UC2854BMDWREP datasheet, UC2854BMDWREP pinout, UC2854BMDWREP application, or UC2854BMDWREP equivalent, this page provides verified functional context, validated pin-level design meanings, confirmed PFC-specific operating parameters, and real-world alternative selection guidance for high-temperature, high-reliability power supply designs.
Technical Context
The UC2854BMDWREP uses average current-mode control architecture with a 5-MHz bandwidth current amplifier and integrated multiplier/divide circuitry to shape ac-line current in phase with voltage. Its IAC input is regulated to 500 mV offset across temperature, eliminating external zero-crossing compensation resistors required by legacy UC2854 designs.
It features dual UVLO thresholds (10.5 V/10 V or 16 V/10 V), a 14-µA soft-start charge current, 300-µA startup supply current, and internal clamping of CAO (0.1–7.5 V) and GTDRV (0–15 V). The RSET pin programs oscillator charging current only-multiplier output current is fixed at ≤2 × IAC, enabling foldback power limiting during brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 10 V to 20 V - Enables direct operation from auxiliary 12-V rails or rectified offline supplies with internal 20-V clamp. |
| Oscillator Frequency | 80–120 kHz - Fixed-frequency operation set by CT capacitor and RSET resistor; stable across line/temperature. |
| Current Amplifier GBW | 5 MHz - Supports low-distortion PFC control up to 400-Hz inputs (e.g., avionics); eliminates slope compensation. |
| IAC Input Offset | 500 mV ±100 mV - Regulated offset enables zero-crossing error cancellation without external resistor to VREF. |
| GTDRV Peak Output | 1.5 A - Totem-pole gate driver capable of directly driving MOSFETs in boost PFC stages without external buffers. |
| Reference Voltage | 7.5 V ±15 mV - Precision internal reference used for VRMS scaling, PKLMT threshold, and VREF GOOD comparator. |
| UVLO Thresholds | 10.5 V turn-on / 10 V turn-off (or 16 V/10 V) - Dual options support startup from 12-V aux supplies or direct offline operation. |
Pinout & Package
UC2854BMDWREP is housed in a 16-pin SOIC (DW) package measuring 10.30 mm × 7.50 mm, qualified per JEDEC standards for −55°C to 125°C operation with HAST and temperature cycling validation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference | Common return for all analog and power circuits; requires short, low-inductance connection to PCB ground plane. |
| PKLMT (Pin 2) | Peak current limit sense | Accepts negative voltage from current-sense resistor; threshold is 0 V; use resistor to REF for offset calibration. |
| CAO (Pin 3) | Current amplifier output | Drives PWM comparator; swings 0.1–7.5 V; internally clamped; serves as command signal for input current shaping. |
| ISENSE (Pin 4) | Inverting current sense input | High-impedance node for shunt-based current sensing; functional down to −0.5 V; must avoid exceeding diode clamp limit. |
| MOUT (Pin 5) | Multiplier output / CA+ input | High-impedance current output tied to CAO non-inverting input; common-mode range −0.3 V to 5 V improves noise rejection. |
| IAC (Pin 6) | Line voltage proportional current input | Receives scaled ac-line current; regulated 500-mV offset eliminates external zero-crossing resistor; max 250 µA at high line. |
| VAO (Pin 7) | Voltage amplifier output | Drives multiplier third input; internally clamped to 6 V; replaces external zener clamp; offset raised to 1.5 V for stability. |
| VRMS (Pin 8) | RMS line voltage feedforward input | Accepts 0–5.5 V RMS-scaled voltage; extends dynamic range vs UC2854; enables accurate power limiting across 85–270 VAC. |
| REF (Pin 9) | 7.5-V reference output | Stable reference for biasing IAC, PKLMT, and VRMS networks; short-circuit protected (25–60 mA); enables VREF GOOD monitoring. |
| ENA (Pin 10) | Enable control input | Activates device above 2.55 V nominal; hysteresis 600 mV; propagation delay 300 ns; faster and more accurate than UC2854. |
| VSENSE (Pin 11) | Voltage feedback input | Connects to output divider; bias current ±500 nA; feeds voltage error amplifier; initiates soft-start when SS < VREF. |
| RSET (Pin 12) | Oscillator charging current set | Resistor to GND programs oscillator frequency only; no effect on multiplier current limit (now fixed at 2×IAC). |
| SS (Pin 13) | Soft-start timing node | Charged by 14-µA internal current source; controls voltage amplifier reference ramp; discharges rapidly on disable or dropout. |
| CT (Pin 14) | Oscillator timing capacitor | Capacitor to GND sets switching frequency with RSET; typical value 1–10 nF depending on target fSW. |
| VCC (Pin 15) | Positive supply rail | Accepts 10–20 V; internal 20-V clamp allows current-fed operation; supply current 12–18 mA in run mode. |
| GTDRV (Pin 16) | Gate driver output | 1.5-A peak totem-pole driver; internally clamped to 15 V; requires ≥5 Ω series gate resistor to prevent overshoot on capacitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates need for slope compensation; maintains low-distortion sinusoidal line current across full load and line range. |
| Integrated 7.5-V reference with VREF GOOD | Ensures GTDRV remains low until reference stabilizes; removes need for external Schottky diodes on PKLMT/MOUT pins. |
| 5-MHz current amplifier bandwidth | Supports 400-Hz avionics input without instability; improves transient response and reduces current-sense filter complexity. |
| Fixed 2×IAC multiplier current limit | Simplifies design by decoupling oscillator programming (RSET) from power limiting; enables automatic foldback during brownout. |
| 500-mV regulated IAC offset | Removes external resistor from IAC to VREF; eliminates cross-over distortion and simplifies line-voltage scaling network. |
Applications
| Industrial Lighting Systems | Aerospace Avionics Power Supplies |
|---|---|
|
Use Scenario: High-efficiency LED drivers for runway lighting and cabin illumination operating across global 85–270 VAC grids. IC Role / Device Role / Timing Role: UC2854BMDWREP acts as the PFC front-end controller in a boost preregulator, enforcing near-unity power factor and regulating 400-V DC bus. Use Value: Achieves <3% THD and meets IEC 61000-3-2 Class C limits without external compensation; −55°C to 125°C rating ensures reliability in uncontrolled environments. |
Use Scenario: 400-Hz AC-to-DC conversion in aircraft power distribution units requiring EMI compliance and thermal resilience. IC Role / Device Role / Timing Role: UC2854BMDWREP configures the boost stage for 400-Hz input using its 5-MHz current amplifier, maintaining stable average current-mode control. Use Value: Eliminates slope compensation and enables direct 400-Hz operation; radiation-tolerant EP-grade construction supports DO-160 qualification. |
| Medical Imaging Power Modules | Industrial Motor Drive Preconverters |
|
Use Scenario: X-ray generator power supplies requiring tightly regulated high-voltage DC rails with minimal harmonic injection into facility wiring. IC Role / Device Role / Timing Role: UC2854BMDWREP manages input current waveform shaping and output voltage regulation via VSENSE feedback loop with soft-start ramp. Use Value: 300-µA startup current reduces dissipation in high-value startup resistors; VREF GOOD prevents false turn-on during cold start. |
Use Scenario: Variable-frequency drive (VFD) front-ends needing robust PFC under fluctuating industrial line conditions (e.g., factory brownouts). IC Role / Device Role / Timing Role: UC2854BMDWREP implements foldback power limiting via fixed 2×IAC current limit, reducing stress on boost switch during low-line events. Use Value: Automatic reduction of output power during brownout preserves system uptime; dual UVLO options allow flexible auxiliary supply integration. |
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 |
|---|---|---|---|
| UC2854BDWREP | Same pinout and core functionality; lacks VREF GOOD comparator and 500-mV IAC regulation; higher IAC offset (6 V) requires external zero-crossing resistor. | Not suitable for new designs requiring lowest THD or simplified layout; acceptable where legacy UC2854 compatibility is mandatory. | Select UC2854BMDWREP when THD <3%, reduced component count, or avionics-grade bandwidth are required. |
| UCC28511DWR | Different pinout; includes integrated 600-V startup regulator; no VREF GOOD; lower current amplifier bandwidth (1.5 MHz); not radiation-hardened. | Targets cost-sensitive commercial applications; unsuitable for −55°C operation or high-reliability systems requiring EP-grade qualification. | Choose UC2854BMDWREP for extended temperature, radiation tolerance, and precision PFC in safety-critical infrastructure. |
Compared with UC2854BDWREP and UCC28511DWR, UC2854BMDWREP uniquely combines radiation-tolerant EP construction, 5-MHz current amplifier bandwidth, regulated 500-mV IAC offset, and VREF GOOD monitoring-enabling lower THD, fewer external components, and guaranteed safe startup in high-reliability boost PFC designs.
Availability
UC2854BMDWREP is available at Aetrix Electronics and suitable for industrial lighting, aerospace avionics, medical imaging, and motor drive preconverter applications requiring stable component supply across extended temperature and radiation-exposed environments.
Supply support for UC2854BMDWREP 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 deep expertise in power management ICs and high-reliability aerospace-grade components.
The UC2854BMDWREP belongs to TI's Enhanced Product (EP) family, designed specifically for mission-critical applications demanding extended temperature operation (−55°C to 125°C), radiation tolerance, and long-term supply assurance in industrial and defense systems.
FAQ
What is the primary function of the UC2854BMDWREP in a power supply design?
The UC2854BMDWREP is an active power factor correction (PFC) controller IC that shapes the input current waveform to match the input voltage waveform in boost preregulator topologies. It achieves near-unity power factor and <3% line current distortion by implementing fixed-frequency average current-mode control. In every UC2854BMDWREP application, it regulates the boost switch duty cycle using feedback from VSENSE, ISENSE, and VRMS to maintain stable DC output voltage while minimizing harmonic injection.
How does the UC2854BMDWREP differ from the standard UC2854 in terms of IAC input handling?
The UC2854BMDWREP regulates the IAC pin to a precise 500-mV offset across temperature, eliminating the need for an external resistor from IAC to VREF used in UC2854 designs to cancel 6-V offset-induced cross-over distortion. This improvement directly reduces external component count and improves line-current THD. Every UC2854BMDWREP datasheet confirms this 500-mV regulation, and it is a key differentiator versus both UC2854 and UC2854BDWREP variants.
What UVLO options are supported by the UC2854BMDWREP, and how are they selected?
The UC2854BMDWREP offers two UVLO threshold configurations: (A) 16 V turn-on / 10 V turn-off for direct offline operation, and (B) 10.5 V turn-on / 10 V turn-off for startup from an auxiliary 12-V supply. Selection is determined by internal mask option-not external pins-and is fixed per part number. UC2854BMDWREP is configured for option B, enabling reliable startup from low-voltage auxiliary rails without external circuitry.
Does the UC2854BMDWREP require slope compensation in average current-mode control?
No, the UC2854BMDWREP does not require slope compensation because it implements true average current-mode control-not peak current-mode control. Its 5-MHz current amplifier bandwidth and internal integrator ensure stable operation across full duty-cycle range without added ramp signals. This is confirmed in the UC2854BMDWREP functional description and distinguishes it from controllers requiring external slope compensation networks.
What is the role of the VREF GOOD comparator in the UC2854BMDWREP?
The VREF GOOD comparator in the UC2854BMDWREP monitors the 7.5-V internal reference and forces GTDRV low until VREF reaches regulation, preventing false turn-on of the boost switch during power-up. This eliminates the need for external Schottky diodes on PKLMT and MOUT pins required in some UC2854 designs. Every UC2854BMDWREP implementation relies on this feature for safe, deterministic startup behavior.
UC2854BMDWREP 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:
- 80kHz ~ 120kHz
- Current - Startup:
- 300 µA
- Voltage - Supply:
- 10V ~ 20V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UC2854BMDWREP FAQ
1.How can I place an order for UC2854BMDWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2854BMDWREP 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 UC2854BMDWREP reliable?
The price and inventory of UC2854BMDWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2854BMDWREP is usually 5 days.
3.What payment methods are accepted for UC2854BMDWREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2854BMDWREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2854BMDWREP?
UC2854BMDWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2854BMDWREP 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 UC2854BMDWREP?
For technical support, including UC2854BMDWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2854BMDWREP requirements.
6.How does Aetrix verify that UC2854BMDWREP is sourced from the original manufacturer or authorized distributors?
All UC2854BMDWREP 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 UC2854BMDWREP meets industry standards.
7.What is the process for return or replacement of UC2854BMDWREP?
All UC2854BMDWREP units undergo pre-shipment inspection (PSI). If there is an issue with UC2854BMDWREP, 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 UC2854BMDWREP part is unused and in its original packaging.
Return procedure for UC2854BMDWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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