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Texas Instruments UC3854BDWTRG4
- Part No.:
- UC3854BDWTRG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC3854BDWTRG4.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,470
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Product details
Overview
UC3854BDWTRG4 from Texas Instruments is a high-performance active power factor correction (PFC) controller IC designed for average current-mode boost preregulators. It delivers near-unity power factor, limits line current distortion to <3%, features a 7.5-V reference, fixed-frequency oscillator, and integrated voltage/current amplifiers with output clamps - enabling single-stage AC/DC front-end designs in industrial SMPS and server power supplies.
For engineers reviewing the UC3854BDWTRG4 datasheet, UC3854BDWTRG4 pinout, UC3854BDWTRG4 application, or UC3854BDWTRG4 equivalent, key selection criteria include its 0–5 V VRMS input range, 5 MHz current amplifier bandwidth, 10.5 V/10 V UVLO thresholds, 1.5-A peak gate driver, and SOIC-16 package compatibility with legacy UC3854 designs.
Technical Context
The UC3854BDWTRG4 implements average current-mode control using an analog multiplier with improved linearity and 500 mV IAC offset, eliminating external zero-crossing compensation resistors. Its multiplier accepts VRMS (0–5 V), IAC (current input), and VAO (voltage amplifier output) to generate MOUT current command, with IMOUT ≤ 2 × IAC enforced for foldback power limiting during brownout.
It integrates a high-bandwidth (5 MHz) current amplifier with ±3 mV offset and –0.3 V to 5.0 V common-mode input range, plus a voltage amplifier with 6.0 V internal clamp and soft-start via SS pin. The GTDRV output drives external MOSFET gates with 1.5-A peak sink/source capability and 35 ns rise/fall times into 1 nF loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 10 V to 20 V - supports direct offline startup or auxiliary 12-V supply operation |
| Oscillator Freq | 80–120 kHz - fixed-frequency operation set by RSET/CT; stable over line/temperature |
| Current Amp BW | 5 MHz typical - enables low-distortion PFC at 400 Hz avionics inputs and fast transient response |
| VRMS Input Range | 0 V to 5.0 V - accommodates wide AC input ranges (85–270 VAC) without external scaling |
| IAC Offset | 500 mV nominal - eliminates need for external resistor from IAC to VREF for zero-crossing compensation |
| GTDRV Output | 1.5-A peak sink/source - directly drives MOSFET gates without external buffer in most 300–500 W designs |
| UVLO Thresholds | 10.5 V turn-on / 10 V turn-off - optimized for startup from auxiliary 12-V rail |
Pinout & Package
UC3854BDWTRG4 is housed in a 16-pin SOIC (DW) package with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and MSL Level-2 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference ground | Common return for all analog and power circuits; requires short, low-inductance PCB connection |
| PKLMT (Pin 2) | Peak current limit threshold input | Accepts negative voltage from current-sense resistor; 0 V threshold enables precise overcurrent protection |
| CAO (Pin 3) | Current amplifier output | Drives PWM comparator; 0.1–7.5 V swing enables full-duty-cycle control in boost topologies |
| ISENSE (Pin 4) | Inverting current sense input | Accepts differential current-sense signal down to –0.5 V; works with MOUT to form noise-rejecting transconductance amplifier |
| MOUT (Pin 5) | Multiplier output / current amp non-inverting input | High-impedance current output (≤2×IAC); shared node enables accurate average-current sensing without slope compensation |
| IAC (Pin 6) | Line voltage proportional current input | Receives scaled AC line current as 100 µA typical; 500 mV regulated offset improves zero-crossing accuracy |
| VAO (Pin 7) | Voltage amplifier output | Internally clamped to 6.0 V; eliminates external zener diode and reduces compensation capacitor charge |
| VRMS (Pin 8) | RMS line voltage input | 0–5.0 V linear range supports 85–270 VAC inputs with no external attenuation network |
| VREF (Pin 9) | 7.5-V precision reference output | Stable 7.5 V ±1% reference; powers internal circuits and serves as feedback reference for VSENSE |
| ENA (Pin 10) | Enable/disable control input | 2.55 V nominal threshold with 600 mV hysteresis; allows system-level PFC sequencing and fault shutdown |
| VSENSE (Pin 11) | Output voltage feedback input | Connects to optocoupler or resistor divider; 2.9–3.1 V input range ensures stable regulation at 3.0 V nominal |
| RSET (Pin 12) | Oscillator charging current set | Resistor to GND programs oscillator frequency only - decoupled from multiplier current limiting |
| SS (Pin 13) | Soft-start timing capacitor node | Internal 14 µA current source ramps SS to >3 V; controls voltage amplifier reference ramp for controlled startup |
| CT (Pin 14) | Oscillator timing capacitor node | Capacitor to GND sets oscillator frequency; ramp valley at 0.8–1.3 V and peak at 4.9–5.9 V |
| VCC (Pin 15) | Positive supply input | 10–20 V operating range; 20 V clamp protects against overvoltage transients |
| GTDRV (Pin 16) | Gate driver output | 1.5-A peak totem-pole output; requires ≥5 Ω series gate resistor to prevent overshoot on capacitive MOSFET gates |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates slope compensation requirement and maintains low THD (<3%) across universal AC input range |
| Integrated 7.5-V reference | ±1% accuracy over temperature; powers internal blocks and provides stable feedback reference for VSENSE |
| 5 MHz current amplifier | Enables clean PFC operation at 400 Hz aircraft inputs and rapid recovery from line dropouts |
| 0–5 V VRMS input range | Supports direct connection of standard 85–270 VAC dividers without external op-amp scaling |
| VREF GOOD comparator | Prevents GTDRV activation until 7.5-V reference stabilizes - removes need for external Schottky diodes on PKLMT/MOUT |
| 10.5 V/10 V UVLO option | Enables reliable startup from 12-V auxiliary supplies while maintaining brownout immunity |
Applications
| Industrial Server Power Supplies | Medical AC/DC Front-Ends |
|---|---|
Use Scenario: 80 PLUS Titanium-certified 1 kW server PSU requiring >98% efficiency and <5% THD at full load. IC Role / Device Role / Timing Role: Primary PFC controller implementing average current-mode boost stage with 100 kHz switching. Use Value: Near-unity power factor and <3% line current distortion meet EN 61000-3-2 Class A limits without additional filtering. | Use Scenario: Isolated 48 V/20 A medical power module needing reinforced insulation and low EMI emissions. IC Role / Device Role / Timing Role: Active PFC controller driving 600 V MOSFET in continuous conduction mode (CCM) boost stage. Use Value: 5 MHz current amplifier bandwidth ensures stable regulation during rapid load steps and 400 Hz input transients. |
| Telecom Rectifiers | Industrial Motor Drive Front-Ends |
Use Scenario: -48 V telecom rectifier with universal AC input (90–264 VAC) and hold-up time >15 ms. IC Role / Device Role / Timing Role: High-efficiency PFC controller managing boost converter with digital supervision interface. Use Value: 10.5 V/10 V UVLO enables seamless handoff from battery backup to AC input without output glitch. | Use Scenario: 3-phase VFD with regenerative braking requiring low-harmonic input current per IEEE 519. IC Role / Device Role / Timing Role: Single-phase PFC stage feeding DC bus for inverter section in modular drive architecture. Use Value: 0–5 V VRMS input range simplifies AC sensing circuitry and improves RMS accuracy over temperature. |
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 |
|---|---|---|---|
| UC3854ADWTRG4 | 16 V/10 V UVLO thresholds; higher turn-on voltage requires larger startup resistor or auxiliary supply redesign | Preferred for offline-only designs where 16 V startup margin is needed; not suitable for 12-V auxiliary start | Select when primary supply is direct rectified AC and brownout immunity above 16 V is required |
| L6562A | Fixed 12.5 V UVLO; lower gate drive (1 A peak); no VREF GOOD comparator; different multiplier architecture | Better suited for cost-sensitive consumer PSUs; lacks VREF GOOD and 5 MHz bandwidth for high-reliability systems | Choose for simpler, lower-cost PFC where 400 Hz operation and strict THD compliance are not required |
Compared with UC3854ADWTRG4 and L6562A, UC3854BDWTRG4 offers superior startup flexibility via 10.5 V UVLO, enhanced noise immunity through VREF GOOD, and higher current amplifier bandwidth - making it optimal for industrial and medical power supplies demanding robustness and wide input range compliance.
Availability
UC3854BDWTRG4 is available at Aetrix Electronics and suitable for industrial server power supplies, medical AC/DC front-ends, telecom rectifiers, and motor drive front-ends requiring stable component supply and long-term design continuity.
Supply support for UC3854BDWTRG4 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 logic solutions for industrial, automotive, and communications markets.
The UC3854B product line was engineered specifically for high-efficiency active PFC in universal-input AC/DC power supplies, emphasizing low THD, wide operating temperature range (0°C to 70°C), and pin compatibility with legacy UC3854 designs.
FAQ
What is the UVLO threshold configuration for UC3854BDWTRG4?
The UC3854BDWTRG4 features a 10.5 V turn-on and 10 V turn-off UVLO threshold, optimized for reliable startup from a 12-V auxiliary supply. This differs from the UC3854ADWTRG4's 16 V/10 V configuration and avoids excessive power dissipation in startup resistors. The hysteresis of 0.5 V ensures stable operation during line sags. This UVLO setting is factory-trimmed and does not require external components to configure.
Does UC3854BDWTRG4 require external slope compensation?
No, UC3854BDWTRG4 does not require external slope compensation because it uses average current-mode control instead of peak current-mode. Its current amplifier compares the sensed inductor current (via ISENSE and MOUT) to a continuous command signal, inherently stabilizing the control loop across all duty cycles and line conditions. This eliminates the need for ramp injection circuits and simplifies PCB layout compared to peak-mode controllers.
What is the maximum recommended IAC input current for UC3854BDWTRG4?
The maximum recommended IAC input current for UC3854BDWTRG4 is 250 µA at peak line voltage (270 VAC), ensuring optimal linearity and zero-crossing accuracy. At this level, the internal 500 mV offset remains stable over temperature, avoiding distortion introduced by external compensation networks. Exceeding 250 µA may degrade THD performance and reduce effective input voltage range due to saturation effects in the multiplier front-end.
How does the VREF GOOD comparator function in UC3854BDWTRG4?
The VREF GOOD comparator in UC3854BDWTRG4 monitors the 7.5-V reference and holds GTDRV low until VREF reaches regulation, preventing premature MOSFET switching during power-up. This eliminates the need for external Schottky diodes on PKLMT and MOUT pins used in UC3854 designs to block false triggering. The comparator has fast propagation delay (~300 ns) and is internally tied to the enable logic, ensuring safe, sequenced startup.
Can UC3854BDWTRG4 be used in 400 Hz avionics PFC applications?
Yes, UC3854BDWTRG4 is qualified for 400 Hz avionics PFC applications due to its 5 MHz current amplifier bandwidth and stable average current-mode control. The high bandwidth enables accurate current shaping at 400 Hz fundamental frequency and suppresses harmonic distortion up to the 10th order. Its –0.3 V to 5.0 V MOUT common-mode range also accommodates large-signal current sensing in high-dynamic-range aerospace converters.
UC3854BDWTRG4 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:
- 250 µA
- Voltage - Supply:
- 10V ~ 20V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UC3854BDWTRG4 FAQ
1.How can I place an order for UC3854BDWTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3854BDWTRG4 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 UC3854BDWTRG4 reliable?
The price and inventory of UC3854BDWTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3854BDWTRG4 is usually 5 days.
3.What payment methods are accepted for UC3854BDWTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3854BDWTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3854BDWTRG4?
UC3854BDWTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3854BDWTRG4 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 UC3854BDWTRG4?
For technical support, including UC3854BDWTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3854BDWTRG4 requirements.
6.How does Aetrix verify that UC3854BDWTRG4 is sourced from the original manufacturer or authorized distributors?
All UC3854BDWTRG4 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 UC3854BDWTRG4 meets industry standards.
7.What is the process for return or replacement of UC3854BDWTRG4?
All UC3854BDWTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3854BDWTRG4, 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 UC3854BDWTRG4 part is unused and in its original packaging.
Return procedure for UC3854BDWTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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