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Texas Instruments UC2854BMDWREPG4
- Part No.:
- UC2854BMDWREPG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC2854BMDWREPG4.pdf
- Description:
- IC PFC CTR AVERAGE 120KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,209
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Product details
Overview
UC2854BMDWREPG4 from Texas Instruments is an advanced high-power-factor preregulator controller IC implementing fixed-frequency average current-mode control for active PFC boost converters. It features a 7.5-V reference, 5-MHz current amplifier bandwidth, 1.5-A peak gate driver, UVLO options (10.5 V/10 V), and <3% line current distortion - deployed in industrial lighting and universal-input AC-DC power supplies.
For engineers reviewing the UC2854BMDWREPG4 datasheet, UC2854BMDWREPG4 pinout, UC2854BMDWREPG4 application, or UC2854BMDWREPG4 equivalent, key selection considerations include its 16-pin SOIC (DW) package, average current mode architecture eliminating slope compensation, integrated multiplier with 500-mV IAC offset, VREF GOOD comparator, and compatibility with worldwide 85–270 VAC inputs.
Technical Context
The UC2854BMDWREPG4 implements average current-mode control using a high-bandwidth (5 MHz) current amplifier and a precision analog multiplier that accepts IAC (line voltage proportional current), VRMS (RMS-sensed input), and VAO (voltage error amplifier output) to generate MOUT - the current command signal. Its internal 7.5-V reference feeds multiple blocks including the VREF GOOD comparator and soft-start circuitry.
Functional operation requires simultaneous enable via ENA (>2.65 V) and valid VCC (10–20 V), with UVLO hysteresis set to 10.5 V turn-on / 10 V turn-off. The GTDRV output delivers 1.5-A peak totem-pole drive with internal 15-V clamp, while RSET sets oscillator charging current independently of multiplier current limiting - which is fixed at 2×IAC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 10 V to 20 V - supports auxiliary 12-V startup or offline bias; internal 20-V clamp enables current-fed operation |
| Current Amplifier BW | 5 MHz typical - enables low-distortion PFC at 400-Hz avionics inputs and fast transient response |
| IAC Input Offset | 500 mV nominal - eliminates external zero-crossing compensation resistor required by UC2854 |
| GTDRV Peak Current | 1.5 A - drives MOSFET gates directly without external buffer; clamped to 15 V for VCC ≤35 V |
| Reference Voltage | 7.5 V ±15 mV - stable, temperature-compensated reference for multiplier, amplifiers, and comparators |
| UVLO Thresholds | 10.5 V (on) / 10 V (off) - optimized for startup from 12-V auxiliary supply; hysteresis prevents chatter |
| Startup Supply Current | 250 µA typical - reduces power loss and size of offline startup resistor |
Pinout & Package
UC2854BMDWREPG4 is housed in a 16-pin SOIC-wide (DW) package measuring 10.30 mm × 7.50 mm, rated for −55°C to +125°C operation and qualified per JEDEC standards for extended temperature reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference | Common return for all analog and power circuits; bypass capacitors must connect with shortest possible leads |
| PKLMT (Pin 2) | Peak current limit input | Accepts negative sense voltage from current-sense resistor; threshold is 0 V; requires REF-bias resistor to avoid sub-GND excursions |
| CAO (Pin 3) | Current amplifier output | Drives PWM comparator; rail-to-rail swing (0.1 V to 7.5 V); one input to duty-cycle comparator |
| ISENSE (Pin 4) | Inverting current sense input | High-impedance node for shunt-based current sensing; functional down to −0.5 V; differential pair with MOUT |
| MOUT (Pin 5) | Multiplier output / current amp non-inverting input | Current-mode command signal; common node for multiplier and CAO feedback path; −0.3 V to 5 V range improves noise immunity |
| IAC (Pin 6) | Line voltage proportional current input | Accepts current from rectified AC line; 500-mV regulated offset eliminates external cancellation network |
| VAO (Pin 7) | Voltage amplifier output | Clamped to 6 V; third multiplier input; drives MOUT; internal clamp replaces external zener diode |
| VRMS (Pin 8) | RMS line voltage input | 0–5.5 V linear range; feeds squaring circuit for line-voltage feedforward; improves distortion performance across 85–270 VAC |
| REF (Pin 9) | 7.5-V reference output | Stable, low-noise reference for biasing IAC, PKLMT, and other analog functions; short-circuit protected (25–60 mA) |
| ENA (Pin 10) | Enable input | 2.65 V (enable) / 2.15 V (disable) thresholds; fast 300-ns disable propagation; replaces discrete enable logic |
| VSENSE (Pin 11) | Voltage feedback input | Connects to output divider; −500 nA to +500 nA bias current minimizes divider loading error |
| CT (Pin 12) | Oscillator timing capacitor | Capacitor to GND sets switching frequency; typical 80–120 kHz range; independent of RSET |
| SS (Pin 13) | Soft-start control | Internally sourced 14-µA current charges external capacitor; controls voltage amplifier reference ramp-up |
| RSET (Pin 14) | Oscillator charging current set | Resistor to GND programs oscillator current only; no effect on multiplier current limit (fixed at 2×IAC) |
| VCC (Pin 15) | Supply voltage input | 10–20 V operating range; 22 V absolute max; internal clamp allows safe operation up to 35 V with GTDRV |
| GTDRV (Pin 16) | Gate driver output | 1.5-A peak totem-pole output; 35-ns rise/fall times into 1 nF; series gate resistor ≥5 Ω recommended |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates need for slope compensation; enables stable, low-distortion sinusoidal line current without instability at high duty cycles |
| Integrated VREF GOOD comparator | Prevents GTDRV activation until 7.5-V reference stabilizes - removes requirement for external Schottky diodes on PKLMT/MOUT |
| 500-mV IAC offset regulation | Removes external resistor network needed on UC2854 to cancel 6-V IAC offset, reducing BOM count and cross-over distortion |
| Fixed 2×IAC multiplier current limit | Simplifies design by decoupling power limiting from RSET; provides foldback during brownout and low-line conditions |
| 10.5 V/10 V UVLO option | Enables direct operation from 12-V auxiliary supply - avoids dedicated startup circuitry in systems with existing DC rails |
Applications
| Industrial Lighting | Universal Input AC-DC Adapters |
|---|---|
|
Use Scenario: High-efficiency LED drivers requiring >0.95 power factor and compliance with IEC 61000-3-2 Class C limits. IC Role / Device Role / Timing Role: UC2854BMDWREPG4 acts as the average current-mode PFC controller in a boost preregulator stage, shaping line current to match voltage waveform. Use Value: Achieves <3% THD and near-unity PF across 85–270 VAC, enabling single-platform designs for global deployment without hardware changes. |
Use Scenario: Compact 250-W laptop adapters supporting worldwide mains voltages (100–240 VAC) with tight efficiency targets. IC Role / Device Role / Timing Role: UC2854BMDWREPG4 manages boost converter dynamics via fixed-frequency (≈100 kHz) average current control and line-voltage feedforward. Use Value: Delivers consistent PFC performance across full input range with minimal external components - reducing layout area and cost vs. UC2854-based solutions. |
| Avionics Power Supplies | Server PSU Front-Ends |
|
Use Scenario: 400-Hz aircraft power conversion where harmonic distortion and transient response are critical. IC Role / Device Role / Timing Role: UC2854BMDWREPG4 serves as the PFC controller with 5-MHz current amplifier bandwidth enabling accurate current tracking at high line frequency. Use Value: Maintains <3% line current distortion even at 400 Hz, meeting MIL-STD-704F harmonic requirements without redesign. |
Use Scenario: High-density 1 kW+ server PSUs requiring robust PFC under dynamic load and brownout conditions. IC Role / Device Role / Timing Role: UC2854BMDWREPG4 implements foldback power limiting via fixed 2×IAC current limit, protecting MOSFETs during low-line events. Use Value: Prevents thermal runaway during sustained brownouts by automatically reducing delivered power - no firmware or external monitoring required. |
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 |
|---|---|---|---|
| UC2854BDWTR | Commercial-grade version (0°C to 70°C); lacks extended temperature qualification and EP-level DMS support | Not rated for −55°C to +125°C operation; unsuitable for aerospace, military, or harsh industrial environments | Select UC2854BMDWREPG4 when extended temperature, enhanced DMS, or space-level pedigree is required |
| UCC28511DR | Single-ended PFC controller with integrated 600-V startup regulator; different pinout and control architecture (voltage-mode) | Lacks average current-mode control and multiplier-based feedforward; higher THD at low line | Choose UC2854BMDWREPG4 for lowest THD, proven average current-mode stability, and legacy UC2854 upgrade path |
Compared with UC2854BDWTR, UC2854BMDWREPG4 adds extended temperature qualification, enhanced DMS support, and tighter reference specs; versus UCC28511DR, it delivers superior line-current fidelity via average current-mode control and analog multiplier feedforward - critical for Class C compliance.
Availability
UC2854BMDWREPG4 is available at Aetrix Electronics and suitable for industrial lighting, avionics power conversion, and server PSU front-ends requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for UC2854BMDWREPG4 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, longevity, and industrial-grade qualification.
The UC2854BMDWREPG4 belongs to TI's high-reliability EP (Enhanced Product) family, designed specifically for demanding applications requiring −55°C to +125°C operation, controlled baseline manufacturing, and extended DMS support.
FAQ
What is the primary function of UC2854BMDWREPG4 in a power supply?
The UC2854BMDWREPG4 is an active power factor correction controller that implements average current-mode control in boost preregulators. It shapes the AC input current waveform to match the voltage waveform, achieving near-unity power factor and <3% line current distortion. Its core function is to drive the main switch via GTDRV based on real-time IAC, VRMS, and VSENSE signals - making it essential for IEC 61000-3-2-compliant AC-DC front-ends.
Does UC2854BMDWREPG4 support operation from a 12-V auxiliary supply?
Yes, UC2854BMDWREPG4 supports 12-V auxiliary startup via its 10.5 V/10 V UVLO option. When configured for this threshold, the device enables at 10.5 V and remains active down to 10 V - allowing direct connection to a system's 12-V rail without external regulators or startup resistors. This feature is explicitly documented in the datasheet's Pin Functions and Electrical Characteristics tables.
How does UC2854BMDWREPG4 differ from the standard UC2854 in terms of IAC input handling?
UC2854BMDWREPG4 regulates the IAC pin to a precise 500-mV offset over temperature, eliminating the 6-V offset present in the UC2854. This removes the need for an external resistor from IAC to VREF used in UC2854 designs to cancel cross-over distortion. As a result, UC2854BMDWREPG4 reduces external component count and improves line-current fidelity - especially at light loads and low line voltages.
What is the purpose of the VREF GOOD comparator in UC2854BMDWREPG4?
The VREF GOOD comparator in UC2854BMDWREPG4 ensures GTDRV remains low until the internal 7.5-V reference has stabilized. This prevents premature gate drive activation during power-up, which could cause uncontrolled inrush or latch-up. By integrating this function, UC2854BMDWREPG4 eliminates the need for external Schottky diodes on PKLMT and MOUT pins - a common requirement in UC2854 designs.
Can UC2854BMDWREPG4 be used in 400-Hz avionics applications?
Yes, UC2854BMDWREPG4 is qualified for 400-Hz avionics use due to its 5-MHz current amplifier bandwidth and extended −55°C to +125°C temperature rating. The high bandwidth enables accurate current sensing and fast loop response at 400 Hz, maintaining <3% THD and meeting MIL-STD-704F harmonic limits. Its EP qualification also ensures reliability in vibration-prone, high-reliability aerospace platforms.
UC2854BMDWREPG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
UC2854BMDWREPG4 FAQ
1.How can I place an order for UC2854BMDWREPG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2854BMDWREPG4 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 UC2854BMDWREPG4 reliable?
The price and inventory of UC2854BMDWREPG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2854BMDWREPG4 is usually 5 days.
3.What payment methods are accepted for UC2854BMDWREPG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2854BMDWREPG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2854BMDWREPG4?
UC2854BMDWREPG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2854BMDWREPG4 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 UC2854BMDWREPG4?
For technical support, including UC2854BMDWREPG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2854BMDWREPG4 requirements.
6.How does Aetrix verify that UC2854BMDWREPG4 is sourced from the original manufacturer or authorized distributors?
All UC2854BMDWREPG4 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 UC2854BMDWREPG4 meets industry standards.
7.What is the process for return or replacement of UC2854BMDWREPG4?
All UC2854BMDWREPG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC2854BMDWREPG4, 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 UC2854BMDWREPG4 part is unused and in its original packaging.
Return procedure for UC2854BMDWREPG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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