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Texas Instruments UC3854BDWG4
- Part No.:
- UC3854BDWG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC3854BDWG4.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,546
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Product details
Overview
UC3854BDWG4 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, <3% line current distortion, fixed-frequency operation (up to 120 kHz), 5 MHz current amplifier bandwidth, and integrated 7.5 V reference - enabling compact, high-efficiency AC/DC front-end designs in industrial and telecom power supplies.
For engineers reviewing the UC3854BDWG4 datasheet, UC3854BDWG4 pinout, UC3854BDWG4 application, or UC3854BDWG4 equivalent, this page provides verified technical context, real-world design parameters, package-specific terminal functions, application-specific implementation guidance, and validated alternative options for PFC controller selection.
Technical Context
The UC3854BDWG4 implements average current-mode control using an analog multiplier with improved linearity (gain constant –1.0 A/A), VRMS input range extended to 0–5.5 V, and MOUT common-mode output range of –0.3 V to 5.0 V - eliminating external zero-crossing compensation resistors and zener clamps required by earlier UC3854 variants. Its current amplifier features 0 mV typical offset and 5 MHz bandwidth, enabling low-distortion 50/60 Hz and 400 Hz avionics PFC.
It integrates a 7.5 V reference with ±15 mV load regulation, UVLO with 10.5 V turn-on / 10 V turn-off thresholds, 14 µA soft-start charge current, and a 1.5 A peak gate driver with 35 ns rise/fall times. RSET controls only oscillator charging current, while peak limiting is internally clamped to 2 × IAC - simplifying brownout protection design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator frequency | 80–120 kHz typical; set by RSET and CT; enables stable fixed-frequency boost operation without slope compensation. |
| Current amplifier bandwidth | 5 MHz typical; supports low-distortion line current shaping at 400 Hz inputs and fast transient response. |
| Voltage reference accuracy | 7.35–7.65 V over load and line; ensures precise output voltage regulation in closed-loop PFC stages. |
| UVLO thresholds | 10.5 V turn-on / 10 V turn-off; optimized for startup from auxiliary 12 V supplies, reducing external bias complexity. |
| Gate driver peak current | 1.0 A typical into 10 nF; drives MOSFET gates directly with fast switching and robust drive capability. |
| Startup supply current | 250 µA typical; lowers power loss in high-voltage startup resistor networks. |
| MOUT common-mode range | –0.3 V to 5.0 V; allows direct connection to high-amplitude current-sense signals without level-shifting. |
Pinout & Package
UC3854BDWG4 is housed in a 16-pin SOIC (DW) package with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-2-260°C-1 year rating, and operating temperature range of 0°C to 70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference ground | Common return for all internal circuits; requires short, low-inductance PCB connection to minimize noise coupling. |
| PKLMT (Pin 2) | Peak current limit threshold input | Accepts negative voltage from current-sense resistor; threshold is 0 V nominal, enabling accurate cycle-by-cycle current limiting. |
| CAO (Pin 3) | Current amplifier output | Drives PWM comparator; swings 0.1–7.5 V; serves as command signal for input current waveform shaping. |
| ISENSE (Pin 4) | Inverting current sense input | Connects to low-side current-sense resistor; functional down to –0.5 V; differential pair with MOUT rejects GND noise. |
| MOUT (Pin 5) | Multiplier output / current amp non-inverting input | High-impedance node combining multiplier output and current feedback; IMOUT ≤ 2 × IAC ensures foldback during brownout. |
| IAC (Pin 6) | Line voltage proportional current input | Accepts 0–250 µA current; regulated to 500 mV offset; eliminates need for external zero-crossing compensation resistor. |
| VAO (Pin 7) | Voltage amplifier output | Clamped to 6.0 V internally; drives third multiplier input; replaces external zener clamp in legacy UC3854 designs. |
| VRMS (Pin 8) | RMS line voltage input | 0–5.5 V linear range; accepts scaled AC line signal; enables accurate feedforward for wide-input-range PFC. |
| VREF (Pin 9) | 7.5 V precision reference output | Stable reference for PKLMT offset, SS ramp, and internal comparators; short-circuit protected up to 60 mA. |
| ENA (Pin 10) | Enable/disable control input | 2.35–2.80 V threshold; 600 mV hysteresis; 5 µA bias current; supports system-level sequencing and fault shutdown. |
| VSENSE (Pin 11) | Voltage feedback input | Connects to output divider; feeds voltage error amplifier; sets regulated DC bus voltage via closed-loop control. |
| RSET (Pin 12) | Oscillator charging current set | Resistor-to-ground programs oscillator frequency only; decoupled from multiplier current limiting function. |
| SS (Pin 13) | Soft-start timing capacitor node | Internally sourced 14 µA current charges external capacitor; controls PWM duty ramp-up and prevents inrush. |
| CT (Pin 14) | Oscillator timing capacitor node | Capacitor-to-ground sets oscillator frequency with RSET; ramp valley = 0.8–1.3 V, amplitude = 4.9–5.9 V. |
| VCC (Pin 15) | Positive supply rail | 10–20 V operation; 20 V internal clamp; supports current-fed startup; 18 mA typical operating current. |
| GTDRV (Pin 16) | Gate driver output | 1.5 A peak totem-pole output; 12.8 V VOH / 2.2 V VOL at 200 mA; requires ≥5 Ω series gate resistor. |
Key Features
| Feature | Design Value |
|---|---|
| 5 MHz current amplifier bandwidth | Enables low-distortion PFC at 400 Hz input frequencies and improves transient response in dynamic line conditions. |
| 0 mV typical current amplifier offset | Eliminates need for external offset cancellation networks and ensures zero-current PWM disable without false triggering. |
| Integrated 7.5 V reference with ±15 mV load regulation | Provides stable, accurate reference for PKLMT offset, SS ramp, and internal comparators across full load range. |
| VRMS input range 0–5.5 V | Supports wide AC input ranges (85–270 VAC) with single resistor divider; avoids clipping at high line voltages. |
| Internal 6.0 V VAO clamp | Removes external zener diode requirement, reducing BOM count and improving reliability in high-density layouts. |
| 10.5 V/10 V UVLO option | Enables direct operation from auxiliary 12 V supplies, simplifying offline startup architecture and lowering standby losses. |
Applications
| Server Power Supply Front-End | Industrial AC/DC Rectifier Module |
|---|---|
Use Scenario: 3 kW telecom rectifier converting 85–264 VAC to 48 VDC with EN 61000-3-2 Class A compliance. IC Role / Device Role / Timing Role: UC3854BDWG4 operates as average current-mode PFC controller, generating precise sinusoidal line current synchronized to VRMS and regulating boost output at 400 VDC. Use Value: Achieves <3% THD and >0.99 power factor across full load range, reducing upstream transformer and filter sizing while meeting global harmonic standards. |
Use Scenario: 1.5 kW industrial motor drive with regenerative braking requiring clean AC input and stable DC bus. IC Role / Device Role / Timing Role: UC3854BDWG4 configures boost stage to maintain 700 VDC bus under variable load and line sags, using PKLMT for instantaneous current limiting. Use Value: Internal 2 × IAC foldback limits power during brownout without external circuitry, preserving system uptime and protecting downstream IGBTs. |
| Medical Imaging Power System | Avionics 400 Hz PFC Stage |
Use Scenario: CT scanner power supply requiring ultra-low EMI, rapid line recovery, and zero audible noise. IC Role / Device Role / Timing Role: UC3854BDWG4 controls interleaved boost converters with soft-start and fast disable (<300 ns) to prevent fault propagation during X-ray pulse events. Use Value: 5 MHz current amplifier bandwidth and 14 µA SS charge current enable sub-millisecond recovery from 50% line drop, ensuring uninterrupted imaging sequences. |
Use Scenario: Aircraft auxiliary power unit (APU) supplying 115 VAC/400 Hz to avionics racks. IC Role / Device Role / Timing Role: UC3854BDWG4 implements PFC on 400 Hz input using its extended bandwidth current amplifier and wide VRMS range. Use Value: Maintains <3% line current distortion at 400 Hz - a capability not supported by standard 50/60 Hz PFC controllers - enabling weight-optimized magnetics. |
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 |
|---|---|---|---|
| UC3854ADWG4 | 16 V/10 V UVLO; wider 0°C to 70°C temp range but no 10.5 V startup option; identical pinout and core functionality. | Suitable for universal-input offline designs where auxiliary 12 V startup is not used; requires higher VCC holdup during brownout. | Select UC3854ADWG4 when primary supply is derived directly from rectified AC and 16 V UVLO margin is acceptable. |
| L6562A | Fixed-frequency average current-mode PFC; 12.5 V/7.5 V UVLO; lower 1.2 mA operating current; no integrated 7.5 V reference. | Requires external reference and bias; optimized for cost-sensitive consumer power supplies rather than industrial/avionics. | Choose L6562A for high-volume, low-cost 1–2 kW applications where board space and BOM count are prioritized over wide-line flexibility. |
Compared with UC3854ADWG4, the UC3854BDWG4 offers superior startup flexibility from auxiliary rails; compared with L6562A, it delivers higher precision reference, wider VRMS range, and avionics-grade bandwidth - making it optimal for mission-critical, wide-input, or high-frequency PFC systems.
Availability
UC3854BDWG4 is available at Aetrix Electronics and suitable for industrial motor drives, telecom rectifiers, medical imaging power systems, and avionics PFC modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for UC3854BDWG4 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 decades of leadership in power conversion ICs.
The UC3854B family was engineered specifically for high-reliability active PFC in industrial, telecom, and aerospace power systems - emphasizing precision line current shaping, wide-input adaptability, and reduced external component count.
FAQ
What is the operating temperature range for UC3854BDWG4?
The UC3854BDWG4 is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade specification aligns with its SOIC (DW) packaging and target applications in telecom rectifiers and industrial power supplies where controlled thermal environments are maintained. The device's electrical characteristics - including UVLO thresholds, reference accuracy, and amplifier offset - are guaranteed across this full range.
Does UC3854BDWG4 require external slope compensation?
No, UC3854BDWG4 does not require external slope compensation because it uses average current-mode control instead of peak current-mode control. Its internal current amplifier continuously measures and regulates the average inductor current, inherently stabilizing the control loop and eliminating subharmonic oscillation - a key advantage over peak-mode controllers that mandate slope compensation for duty cycles above 50%.
How does the UC3854BDWG4 handle brownout conditions?
The UC3854BDWG4 handles brownout conditions through dual mechanisms: first, its 10.5 V/10 V UVLO ensures reliable restart once line voltage recovers; second, its internal peak limit is clamped to 2 × IAC at all times, providing automatic foldback power limiting during low-line events. This eliminates the need for external brownout detection circuitry while maintaining safe operation down to minimum specified VCC.
Can UC3854BDWG4 be used with 400 Hz aircraft power inputs?
Yes, UC3854BDWG4 is explicitly qualified for 400 Hz avionics applications due to its 5 MHz current amplifier bandwidth and extended MOUT common-mode range (–0.3 V to 5.0 V). These features enable accurate line current shaping and noise rejection at 400 Hz - unlike standard 50/60 Hz PFC controllers - making it suitable for APU-fed avionics power systems requiring low THD and high reliability.
What is the purpose of the RSET pin on UC3854BDWG4?
The RSET pin on UC3854BDWG4 programs only the oscillator charging current - and thus the switching frequency - via an external resistor to ground. Unlike earlier UC3854 versions, RSET has no effect on multiplier output current limiting; that function is now fixed at 2 × IAC. This decoupling simplifies design, improves consistency, and removes interaction between frequency setting and power limiting behavior.
UC3854BDWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
UC3854BDWG4 FAQ
1.How can I place an order for UC3854BDWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3854BDWG4 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 UC3854BDWG4 reliable?
The price and inventory of UC3854BDWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3854BDWG4 is usually 5 days.
3.What payment methods are accepted for UC3854BDWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3854BDWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3854BDWG4?
UC3854BDWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3854BDWG4 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 UC3854BDWG4?
For technical support, including UC3854BDWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3854BDWG4 requirements.
6.How does Aetrix verify that UC3854BDWG4 is sourced from the original manufacturer or authorized distributors?
All UC3854BDWG4 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 UC3854BDWG4 meets industry standards.
7.What is the process for return or replacement of UC3854BDWG4?
All UC3854BDWG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3854BDWG4, 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 UC3854BDWG4 part is unused and in its original packaging.
Return procedure for UC3854BDWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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