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Texas Instruments UC3854BN
- Part No.:
- UC3854BN
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UC3854BN.pdf
- Description:
- IC PFC CTR AV CURR 200KHZ 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,509
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Product details
Overview
UC3854BN from Texas Instruments is a fixed-frequency average current-mode power factor correction (PFC) controller IC designed for boost preregulator topologies. It achieves near-unity power factor by shaping AC line current to match line voltage, features a 7.5-V reference, integrated 5-MHz current amplifier with ≤3 mV offset, and supports world-wide operation without manual switching. It is used in offline AC/DC front-end supplies for industrial SMPS and server power supplies.
For engineers reviewing the UC3854BN datasheet, UC3854BN pinout, UC3854BN application, or UC3854BN equivalent, key selection considerations include its 0°C to 70°C operating range, PDIP-16 package, UVLO thresholds (16 V turn-on / 10 V turn-off), 100 kHz nominal oscillator frequency, and compatibility with average-current-mode PFC designs requiring low line-current distortion (<3%) and accurate power limiting.
Technical Context
The UC3854BN implements average current-mode control using an analog multiplier that accepts IAC (line-voltage-proportional current), VRMS (RMS-sensed voltage), and VAO (voltage amplifier output) to generate a current command at MOUT. Its high-bandwidth (5 MHz) current amplifier eliminates slope compensation needs and enables stable sinusoidal input current even at 400 Hz avionics line frequencies.
It integrates a 7.5-V reference with ±15 mV tolerance, soft-start via SS pin with 14 µA charge current, and a 1.5-A peak gate driver (GTDRV) with 35 ns rise/fall times. The multiplier's improved common-mode input range (–0.3 V to 5.0 V at MOUT) and clamped VAO output (0.1 V to 7.5 V) reduce external component count versus legacy UC3854 designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator frequency | 100 kHz nominal; sets PWM switching frequency for boost converter stage. |
| VCC UVLO turn-on/off | 16 V / 10 V; ensures reliable startup and brownout protection in offline applications. |
| Current amplifier bandwidth | 5 MHz typical; enables low-distortion current regulation at 400 Hz line inputs. |
| Reference voltage | 7.5 V ±0.15 V; provides stable internal bias for multiplier and error amplifiers. |
| Gate driver peak current | 1.5 A peak; directly drives MOSFET gates without external buffer in most PFC designs. |
| Input offset voltage (current amp) | ≤ ±3 mV over temperature; minimizes line-current harmonic distortion in average-mode control. |
| Soft-start charge current | 14 µA; controls ramp rate of SS pin to limit inrush current during power-up. |
Pinout & Package
The UC3854BN is housed in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Thermal resistance θJA is 90°C/W on standard FR4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power and signal reference | Common return for all internal circuits; requires short, low-inductance connection to PCB ground plane. |
| 2 (PKLMT) | Peak current limit threshold | Accepts negative voltage from current-sense resistor; sets maximum switch current via internal comparator. |
| 3 (CAO) | Current amplifier output | Drives PWM comparator; swings 0.1–7.5 V; serves as current command signal for boost MOSFET duty cycle. |
| 4 (ISENSE) | Inverting current sense input | Connects to low-side current-sense resistor; operates down to –0.5 V; forms differential pair with MOUT. |
| 5 (MOUT) | Multiplier output / current amp non-inverting input | High-impedance node combining multiplier output and current sense reference; common-mode range –0.3 V to 5.0 V. |
| 6 (IAC) | Line voltage proportional current input | Accepts current scaled from AC line; regulated to ~500 mV; eliminates need for external zero-crossing compensation. |
| 7 (VAO) | Voltage amplifier output | Clamped to 6.0 V; third multiplier input; feeds voltage error signal into power calculation loop. |
| 8 (VRMS) | RMS line voltage input | Accepts 0–5.5 V DC signal representing RMS line voltage; enables line-voltage feedforward for constant power regulation. |
| 9 (VREF) | 7.5-V reference output | Stable internal reference; required for device operation; supplies bias to internal circuitry. |
| 10 (ENA) | Enable/disable control | Active-high; 2.55 V nominal threshold; 600 mV hysteresis prevents chatter during marginal supply conditions. |
| 11 (VSENSE) | Voltage feedback input | Connects to output voltage divider; input to voltage error amplifier; sets regulated DC bus voltage. |
| 12 (RSET) | Oscillator charging current set | Resistor-to-ground programs oscillator frequency; independent of multiplier current limiting function. |
| 13 (SS) | Soft-start timing node | Internally charged to >3 V at 14 µA; controls voltage amplifier reference ramp to limit inrush current. |
| 14 (CT) | Oscillator timing capacitor | Capacitor-to-ground sets oscillator frequency with RSET; typical value 1.5 nF for 100 kHz. |
| 15 (VCC) | Supply voltage input | Operates from 10–20 V; includes 20 V internal clamp; draws 12–18 mA in active mode. |
| 16 (GTDRV) | Gate drive output | 1.5-A peak totem-pole driver; requires ≥5 Ω series gate resistor to prevent overshoot on capacitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates slope compensation requirement and enables stable, low-distortion sinusoidal line current across universal AC input ranges. |
| 5-MHz current amplifier | Supports high-frequency line inputs (e.g., 400 Hz avionics) while maintaining <3% THD on input current waveform. |
| Integrated 7.5-V reference | ±0.15 V accuracy over temperature; replaces external precision reference and reduces BOM count. |
| Multiplier with 0–5.5 V VRMS range | Enables accurate line-voltage feedforward from 85–270 VAC without external scaling resistors or clamps. |
| VREF GOOD comparator | Prevents GTDRV activation until VREF stabilizes, eliminating need for external Schottky diodes on PKLMT/MOUT pins. |
| 10.5 V / 10 V UVLO option (UC3854B variant) | Allows direct startup from auxiliary 12-V rail - not applicable to UC3854BN (16 V / 10 V UVLO). |
Applications
| Industrial AC/DC Power Supplies | Server Front-End Rectifiers |
|---|---|
|
Use Scenario: 3 kW telecom rectifier operating from 85–264 VAC input with EN61000-3-2 Class A compliance required. IC Role / Device Role / Timing Role: UC3854BN configures boost PFC stage to shape input current, regulate 380 VDC bus, and maintain >0.99 power factor across full load range. Use Value: Achieves <3% line current THD and eliminates need for external slope compensation or zener clamps on VAO. |
Use Scenario: Redundant 1.2 kW server PSU with active cooling and tight thermal constraints. IC Role / Device Role / Timing Role: UC3854BN controls interleaved boost converters to distribute thermal load and reduce EMI filter size. Use Value: 5-MHz current amplifier bandwidth enables fast transient response to dynamic CPU load changes without current-loop instability. |
| Medical Equipment Power Modules | LED Driver Front-Ends |
|
Use Scenario: UL60601-1 compliant imaging system power supply requiring low leakage and high reliability. IC Role / Device Role / Timing Role: UC3854BN manages isolated boost PFC stage with reinforced insulation and controlled inrush via SS pin. Use Value: 14 µA soft-start charge current allows precise control of output voltage ramp rate to meet medical safety standards. |
Use Scenario: Outdoor LED streetlight driver with wide ambient temperature range (–40°C to +85°C ambient). IC Role / Device Role / Timing Role: UC3854BN regulates boost PFC stage feeding downstream LLC resonant converter for constant-current LED output. Use Value: 7.5-V reference stability (±0.15 V) ensures consistent output voltage regulation despite input line fluctuations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power factor correction controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3854BDW | Same functional spec, SOIC-16 package; θJA = 50–130°C/W vs. 90°C/W for PDIP; RoHS-compliant NiPdAu finish. | Suitable for surface-mount production; requires reflow profile compliance; lower thermal mass than PDIP. | Select UC3854BDW for automated SMT assembly; UC3854BN remains preferred for prototyping, through-hole boards, or legacy rework. |
| UCC3854N | Pin-compatible successor; improved start-up current (250 µA vs. 300 µA), enhanced ESD rating, and extended temp range (–40°C to 105°C). | Enables higher ambient temperature operation and reduced standby losses in energy-sensitive designs. | Choose UCC3854N for new designs targeting long-term availability and extended thermal margin; UC3854BN remains valid for cost-sensitive or legacy-replacement use. |
Compared with UC3854BDW and UCC3854N, the UC3854BN offers proven reliability in through-hole industrial systems, simpler thermal management on FR4 boards, and direct drop-in replacement for existing UC3854-based designs-without requiring layout changes or requalification.
Availability
UC3854BN is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, server front-end rectifiers, and medical equipment power modules requiring stable component supply and long-lifecycle support.
Supply support for UC3854BN 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 UC3854 family was developed specifically for active power factor correction in offline AC/DC systems, targeting high-efficiency, low-harmonic, and compact front-end designs across industrial, computing, and medical markets.
FAQ
What is the operating temperature range for the UC3854BN?
The UC3854BN is specified for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with its PDIP-16 packaging and targets indoor industrial and computing power supply applications where ambient thermal conditions are controlled. The UC3854BN datasheet confirms this range under Recommended Operating Conditions and distinguishes it from the wider –40°C to 85°C range of the UC2854BN variant.
Does the UC3854BN support average current-mode control without slope compensation?
Yes, the UC3854BN implements true average current-mode control using a high-bandwidth (5 MHz) current amplifier and analog multiplier architecture. This eliminates the need for external slope compensation - a key differentiator from peak current-mode controllers. The UC3854BN datasheet explicitly states this capability enables "stable, low distortion sinusoidal line current without the need for slope compensation."
What are the UVLO thresholds for the UC3854BN?
The UC3854BN has a VCC undervoltage lockout (UVLO) with a turn-on threshold of 16.0 V (typical) and turn-off threshold of 10.0 V (typical), providing 6 V hysteresis. These values are confirmed in the Electrical Characteristics table for UCx854A variants and apply specifically to the UC3854BN, distinguishing it from the UC3854B variant which uses 10.5 V / 10 V thresholds.
Can the UC3854BN be used in 400 Hz avionics power supplies?
Yes, the UC3854BN's 5 MHz current amplifier bandwidth and average current-mode architecture support stable operation with 400 Hz AC line inputs. The datasheet explicitly cites avionics as a target application, noting that the improved bandwidth is "essential for 400 Hz input avionics applications" - enabling low-distortion current regulation where legacy controllers would oscillate or distort.
Is the UC3854BN pin-compatible with the original UC3854?
Yes, the UC3854BN is pin-compatible with the industry-standard UC3854 and serves as a direct functional upgrade. TI documentation states the UC3854A/B products are "pin compatible enhanced versions" offering improvements including lower offset current amplifier, faster enable comparator, and integrated VREF GOOD function - all without altering pin assignment or electrical interface.
UC3854BN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Mode:
- Average Current
- Frequency - Switching:
- 200kHz
- Current - Startup:
- 250 µA
- Voltage - Supply:
- 10V ~ 20V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
UC3854BN FAQ
1.How can I place an order for UC3854BN through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3854BN 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 UC3854BN reliable?
The price and inventory of UC3854BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3854BN is usually 5 days.
3.What payment methods are accepted for UC3854BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3854BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3854BN?
UC3854BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3854BN 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 UC3854BN?
For technical support, including UC3854BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3854BN requirements.
6.How does Aetrix verify that UC3854BN is sourced from the original manufacturer or authorized distributors?
All UC3854BN 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 UC3854BN meets industry standards.
7.What is the process for return or replacement of UC3854BN?
All UC3854BN units undergo pre-shipment inspection (PSI). If there is an issue with UC3854BN, 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 UC3854BN part is unused and in its original packaging.
Return procedure for UC3854BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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