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Texas Instruments UC2854DWTRG4
- Part No.:
- UC2854DWTRG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC2854DWTRG4.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
UC2854DWTRG4 from Texas Instruments is a high-power-factor preregulator IC implementing average current-mode control for boost-type active PFC stages. It delivers 0.99 power factor, <5% line-current distortion, fixed 46–62 kHz PWM frequency (RSET-programmable), and integrates a 7.5-V precision reference, 1-A totem-pole gate driver, analog multiplier/divider, voltage/current amplifiers, and feedforward line regulation - used in offline AC/DC supplies delivering up to 400 VDC output.
For engineers reviewing the UC2854DWTRG4 datasheet, UC2854DWTRG4 pinout, UC2854DWTRG4 application, or UC2854DWTRG4 equivalent, key selection considerations include its average current-mode architecture (no slope compensation required), RMS line-voltage feedforward (VRMS input), soft-start control (SS pin), peak current limit (PKLMT), and SOIC-16 packaging with industrial temperature range (–40°C to +85°C).
Technical Context
The UC2854DWTRG4 implements full analog average current-mode control: the voltage amplifier (VAOUT) sets the current command via the analog multiplier, whose inputs are VRMS (feedforward), VAOUT (voltage error), and IAC (line-current sense); the resulting MULTOUT current drives the current amplifier, which compares against ISENSE to generate CAOUT for PWM timing. This architecture eliminates need for slope compensation and provides stable operation across continuous/discontinuous conduction modes.
Its oscillator uses RSET and CT to set frequency (46–62 kHz typical), while GTDRV delivers 1-A peak drive clamped to 14.5 V, enabling direct interface with power MOSFETs. The 7.5-V VREF supports external biasing, and ENA enables/disables PWM, reference, and oscillator with 2.55-V threshold and 0.25-V hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Power Factor | 0.99 - enables compliance with EN61000-3-2 Class D for >75 W equipment |
| Line Current Distortion | <5% - ensures low harmonic injection into AC mains |
| Oscillator Frequency | 46–62 kHz - programmable via RSET resistor; supports EMI filtering and core loss optimization |
| Voltage Reference | 7.5 V ±0.15 V - stable, temperature-compensated reference for feedback and bias networks |
| Gate Driver Output | 1 A peak, 14.5 V max - directly drives MOSFET gates without external buffers in most 250–500 W designs |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade power supply environments |
| Supply Voltage Range | 10–20 V - supports wide-input auxiliary supplies with UVLO at 10 V turn-off |
Pinout & Package
UC2854DWTRG4 is housed in a 16-pin SOIC (DW) package measuring 7.50 mm × 10.30 mm, optimized for surface-mount assembly and thermal performance (RθJA = 71.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return for all analog and power circuits; requires direct 0.1-µF ceramic bypass to minimize noise coupling |
| PKLMT (Pin 2) | Peak current limit input | Threshold at 0 V; connects to negative side of current-sense resistor to enable cycle-by-cycle overcurrent shutdown |
| CAOUT (Pin 3) | Current amplifier output | Drives PWM comparator; swings near GND to force zero duty cycle; remains active during disable |
| ISENSE (Pin 4) | Current-sense inverting input | Accepts differential current-sense signal down to –0.3 V; paired with MULTOUT for noise-rejecting current sensing |
| MULTOUT (Pin 5) | Multiplier output / current-sense non-inverting input | High-impedance node carrying scaled line-current command; also serves as CA+ input for differential sensing |
| IAC (Pin 6) | AC current input | Current-mode input for instantaneous line voltage sensing; nominal 6 V offset cancels crossover distortion when biased correctly |
| VAOUT (Pin 7) | Voltage amplifier output | Regulates boost output voltage; internally clamped to 5.8 V; remains active during disable to preserve loop stability |
| VRMS (Pin 8) | RMS line voltage input | Accepts 1.5–3.5 V proportional to input RMS voltage; enables feedforward line regulation for fast transient response |
| VREF (Pin 9) | 7.5-V reference output | Supplies 10 mA; disabled when VCC < 10 V or ENA low; requires 0.1-µF ceramic bypass for stability |
| ENA (Pin 10) | Enable input | Logic-level enable (2.55 V threshold); releases SS clamp and activates reference/oscillator/PWM when high |
| VSENSE (Pin 11) | Voltage amplifier inverting input | Connects to resistive divider from boost output; sets regulated DC bus voltage (e.g., 400 VDC) |
| RSET (Pin 12) | Oscillator charge current set | Resistor to GND programs oscillator frequency and limits maximum multiplier output current |
| SS (Pin 13) | Soft-start control | Internal 14-mA current source ramps SS; controls voltage amplifier reference to limit inrush current during startup |
| CT (Pin 14) | Oscillator timing capacitor | Capacitor to GND sets PWM frequency; CT ramp amplitude is 4.9–5.9 V peak-to-valley |
| VCC (Pin 15) | Positive supply input | Requires ≥20 mA at 17–20 V; bypassed directly to GND; inhibits operation below 10 V UVLO threshold |
| GTDRV (Pin 16) | Gate driver output | Totem-pole MOSFET driver; 1-A peak; clamped to 14.5 V; requires ≥5 Ω series gate resistor to prevent overshoot |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables stable, distortion-free sinusoidal line current without slope compensation across CCM/DCM transitions |
| Feedforward line regulation (VRMS) | Compensates for input voltage variations in real time, reducing output voltage deviation during line transients | Integrated 7.5-V reference | Provides precise, low-drift bias for feedback dividers and external circuitry; eliminates need for external reference IC |
| 1-A totem-pole gate driver | Directly drives power MOSFET gates in 250–500 W boost stages without buffer stages or level shifters |
| Soft-start with SS pin | Programmable ramp-up of voltage reference prevents output overvoltage and inrush current during startup |
Applications
| Server Power Supply | Industrial Motor Drive Input Stage |
|---|---|
Use Scenario: 80 PLUS Titanium-certified 1.5 kW AC/DC front-end supplying 12 V/48 V rails to CPU/GPU and storage subsystems. IC Role / Device Role / Timing Role: UC2854DWTRG4 acts as the active PFC controller in a continuous-conduction-mode boost preregulator, regulating 400 VDC bus while maintaining >0.99 PF across 90–264 VAC input. Use Value: Enables compliance with EN61000-3-2 Class D and reduces RMS input current by ~40% vs passive PFC, lowering upstream breaker sizing and transformer losses. | Use Scenario: 3-phase rectified input stage feeding a 30 kW variable-frequency drive with regenerative braking capability. IC Role / Device Role / Timing Role: UC2854DWTRG4 controls single-phase boost PFC on each phase leg to maintain unity PF and reduce harmonic injection into factory distribution system. Use Value: Limits THD to <4% at full load, avoiding utility penalties and preventing interference with sensitive PLC and sensor networks. |
| Medical Imaging Power System | Telecom Rectifier Shelf |
Use Scenario: High-reliability 3 kW power system for MRI gradient coil drivers requiring ultra-low EMI and zero downtime. IC Role / Device Role / Timing Role: UC2854DWTRG4 manages boost PFC with VRMS feedforward and soft-start sequencing to ensure clean, stable 400 VDC bus under rapid load steps. Use Value: Achieves 0.999 PF and 3.81% THD per EN61000-3-2 testing, meeting IEC 60601-1-2 immunity requirements for diagnostic equipment. | Use Scenario: -48 VDC telecom rectifier shelf with hot-swappable modules supporting 20 A per slot in central office environments. IC Role / Device Role / Timing Role: UC2854DWTRG4 implements universal-input (90–264 VAC) PFC in each 1.2 kW module, enabling consistent efficiency across global grid voltages. Use Value: Eliminates manual voltage-select switches and supports automatic 50/60 Hz operation, reducing field service errors and inventory SKUs. |
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), higher current amplifier bandwidth (5 MHz), 3 V VSENSE max vs 11 V | Better suited for low-input-voltage or high-bandwidth designs; not drop-in compatible due to VSENSE and UVLO differences | Select UCC2854A only if designing new systems requiring tighter line regulation or faster transient response - verify VSENSE divider and startup sequence. |
| ICE2PCS01 | Fixed-frequency CCM/DCM hybrid controller; integrated MOSFET driver; no VRMS feedforward; different pinout and multiplier architecture | Targets cost-sensitive consumer/IT PSUs; lacks feedforward line regulation and analog multiplier flexibility of UC2854DWTRG4 | Choose ICE2PCS01 for simplified BOM and lower gate count where 0.98 PF suffices; avoid if EN61000-3-2 Class D compliance or wide input range is mandatory. |
Compared with UCC2854A and ICE2PCS01, UC2854DWTRG4 offers superior line feedforward accuracy and proven 0.99 PF performance in industrial/medical designs, but requires more external components and careful layout for noise immunity - making it ideal for applications where reliability and regulatory margin outweigh BOM cost.
Availability
UC2854DWTRG4 is available at Aetrix Electronics and suitable for server power supplies, industrial motor drive input stages, medical imaging systems, and telecom rectifier shelves requiring stable component supply and long-term industrial temperature support.
Supply support for UC2854DWTRG4 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 over 50 years of innovation in power conversion ICs.
The UCx854 product line was designed specifically for high-efficiency, high-power-factor active PFC in offline AC/DC converters - targeting industrial, medical, telecom, and enterprise computing applications demanding strict harmonic compliance and robust thermal performance.
FAQ
What is the operating temperature range for UC2854DWTRG4?
The UC2854DWTRG4 is rated for industrial operation from –40°C to +85°C junction temperature. This range is confirmed in Section 7.3 (Recommended Operating Conditions) of the SLUS336A datasheet and distinguishes it from the UC1854 (–55°C to 125°C) and UC3854 (0°C to 70°C). Thermal derating must follow RθJA = 71.5°C/W for the SOIC-16 (DW) package.
Does UC2854DWTRG4 support universal AC input (90–264 VAC)?
Yes, UC2854DWTRG4 supports universal AC input via its VRMS feedforward input and average current-mode architecture. The device maintains >0.99 power factor and <5% THD across 75–275 VAC line voltages and 50–400 Hz frequencies, as validated in TI's typical application circuits and EN61000-3-2 test reports for UC2854DWTRG4-based 250 W designs.
What is the function of the RSET pin on UC2854DWTRG4?
The RSET pin on UC2854DWTRG4 programs both the oscillator charging current (setting PWM frequency between 46–62 kHz) and the maximum multiplier output current. A resistor from RSET to GND determines oscillator frequency via fOSC ≈ 1/(1.25 × RRSET × CCT) and caps multiplier output at 3.75 V / RRSET, preventing overdrive of the current amplifier.
Can UC2854DWTRG4 be used in discontinuous conduction mode (DCM)?
Yes, UC2854DWTRG4 operates stably in both continuous and discontinuous conduction modes due to its average current-mode control architecture. Unlike peak current-mode controllers, it requires no slope compensation in DCM and maintains low line-current distortion and stable regulation - as documented in Section 8.1 and Figure 9 of the UC2854DWTRG4 datasheet.
Is UC2854DWTRG4 pin-compatible with UC3854 or UC1854?
Yes, UC2854DWTRG4 shares identical pinout, functionality, and electrical specifications with UC1854 and UC3854 in the same SOIC-16 package. All three variants use the same DW footprint and pin assignments per Table 6 (Pin Configuration and Functions) in SLUS336A - differing only in temperature grade and minor parameter tolerances (e.g., UC2854DWTRG4 specifies –40°C to +85°C operation).
UC2854DWTRG4 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:
- 200kHz
- Current - Startup:
- 1.5 mA
- Voltage - Supply:
- 14.5V ~ 30V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UC2854DWTRG4 FAQ
1.How can I place an order for UC2854DWTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2854DWTRG4 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 UC2854DWTRG4 reliable?
The price and inventory of UC2854DWTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2854DWTRG4 is usually 5 days.
3.What payment methods are accepted for UC2854DWTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2854DWTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2854DWTRG4?
UC2854DWTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2854DWTRG4 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 UC2854DWTRG4?
For technical support, including UC2854DWTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2854DWTRG4 requirements.
6.How does Aetrix verify that UC2854DWTRG4 is sourced from the original manufacturer or authorized distributors?
All UC2854DWTRG4 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 UC2854DWTRG4 meets industry standards.
7.What is the process for return or replacement of UC2854DWTRG4?
All UC2854DWTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC2854DWTRG4, 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 UC2854DWTRG4 part is unused and in its original packaging.
Return procedure for UC2854DWTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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