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Texas Instruments UC2854AN
- Part No.:
- UC2854AN
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UC2854AN.pdf
- Description:
- IC PFC CTR AV CURR 200KHZ 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,784
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Product details
Overview
UC2854AN from Texas Instruments is a fixed-frequency average current-mode power factor correction (PFC) controller IC designed for boost preregulator topologies. It features a 7.5-V reference, 5-MHz current amplifier, 1.5-A gate driver, UVLO thresholds of 10.5 V turn-on / 10 V turn-off, and operates across –40°C to +85°C. It enables near-unity power factor in AC/DC front-end supplies for industrial and telecom rectifiers.
For engineers reviewing the UC2854AN datasheet, UC2854AN pinout, UC2854AN application, or UC2854AN equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to UC2854AN's PDIP-16 packaging and temperature grade.
Technical Context
The UC2854AN 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 sinusoidal current command. Its 5-MHz current amplifier achieves low line-current distortion (<3%) without slope compensation.
It integrates a 7.5-V reference with ±15 mV offset tolerance, soft-start via SS pin with 14-µA charge current, and a 1.5-A totem-pole GTDRV output capable of driving MOSFET gates directly. The multiplier output (MOUT) serves as both multiplier output and non-inverting input to the current amplifier, supporting differential sensing with IMOUT ≤ 2 × IAC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO | 10.5 V turn-on / 10 V turn-off - enables startup from 12-V auxiliary rails and ensures reliable brownout recovery. |
| Current Amplifier GBW | 5 MHz - supports high-fidelity current shaping up to 400 Hz inputs (e.g., avionics) without distortion. |
| Reference Voltage | 7.5 V ±0.15 V - stable internal reference for voltage regulation and multiplier scaling; load-regulated to ±20 mV. |
| GTDRV Output | 1.5-A peak sink/source - drives standard boost MOSFETs without external buffers; rise/fall time ≤35 ns @ 1 nF. |
| Startup Supply Current | 250 µA typical - reduces power loss in high-voltage startup networks; enables smaller, cooler resistors. |
| MOUT Common-Mode Range | –0.3 V to 5.0 V - allows direct connection to high-side current sense amplifiers or shunt-based sensing without level shift. |
| Oscillator Accuracy | ±15% over line/temperature - sets PWM frequency via RSET/CT; initial accuracy ±15% at 25°C (85–115 kHz). |
Pinout & Package
UC2854AN 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 = 90°C/W on standard FR4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power and signal reference | Common return for all analog and power circuits; requires short, low-inductance connection to PCB ground plane. |
| 2 PKLMT | Peak current limit threshold | Accepts negative voltage from current-sense resistor; 0 V threshold enables foldback limiting during brownout. |
| 3 CAO | Current amplifier output | Drives PWM comparator; swings 0.1–7.5 V; clamped internally to avoid external zener diodes. |
| 4 ISENSE | Inverting current sense input | High-impedance input to current amplifier; functional down to –0.5 V; must avoid exceeding diode clamp limit. |
| 5 MOUT | Multiplier output / CA+ input | High-impedance node combining multiplier output and current amplifier non-inverting input; IMOUT ≤ 2 × IAC. |
| 6 IAC | Line voltage proportional current input | Accepts 100 µA nominal current; regulated to 500 mV offset - eliminates zero-crossing compensation resistor. |
| 7 VAO | Voltage amplifier output | Third multiplier input; internally clamped to 6.0 V; offset raised to 1.5 V for improved dynamic range. |
| 8 VRMS | RMS line voltage input | 0–5.5 V linear range; enables accurate squaring without discontinuities; 1.5 V at 85 VAC, 4.77 V at 270 VAC. |
| 9 VREF | 7.5-V reference output | Stable internal reference; supplies bias to internal blocks; short-circuit current ≥25 mA. |
| 10 ENA | Enable/disable control | 2.55 V nominal threshold; 600 mV hysteresis; internal 10-V clamp prevents overvoltage damage. |
| 11 VSENSE | Voltage feedback input | Inverting input to voltage amplifier; monitors DC bus via resistor divider; bias current ±500 nA. |
| 12 RSET | Oscillator charging current set | Resistor to GND programs oscillator frequency only - no effect on multiplier current limiting. |
| 13 SS | Soft-start timing node | Internally charged at 14 µA; controls voltage amplifier reference ramp; discharges rapidly on disable. |
| 14 CT | Oscillator timing capacitor | Capacitor to GND sets PWM frequency with RSET; ramp valley 0.8–1.3 V, amplitude 4.9–5.9 V. |
| 15 VCC | Supply input | 10–20 V operation; 20-V clamp protects against transients; 18 mA operating current. |
| 16 GTDRV | Gate drive output | Totem-pole MOSFET driver; VOH ≥12.0 V @ –200 mA, VOL ≤2.2 V @ 200 mA; requires ≥5 Ω series gate resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates need for slope compensation and enables stable, low-distortion sinusoidal line current shaping. |
| Integrated 5-MHz current amplifier | Reduces line current THD to <3% even at 400 Hz input; offset voltage 0 V to ±3 mV over temperature. |
| Enhanced multiplier circuit | 0–5.5 V VRMS range and 500 mV IAC offset eliminate external zero-crossing compensation components. |
| VREF GOOD comparator | Prevents GTDRV activation until 7.5-V reference stabilizes - removes need for external Schottky diodes on PKLMT/MOUT. |
| UVLO options (10.5 V / 10 V) | Enables direct startup from 12-V auxiliary supplies while maintaining robust offline operation. |
Applications
| Industrial AC/DC Power Supplies | Telecom Rectifier Modules |
|---|---|
Use Scenario: 3 kW telecom rectifier with universal AC input (85–264 VAC) and 54 VDC output. IC Role / Device Role / Timing Role: UC2854AN configures boost PFC stage to deliver regulated 400 VDC bus with >0.99 PF and <5% THD. Use Value: Enables compliance with EN 61000-3-2 Class A; reduces upstream transformer and filter sizing by 30%. | Use Scenario: Rack-mounted server power supply requiring high-efficiency front-end with hold-up time >15 ms. IC Role / Device Role / Timing Role: UC2854AN controls average inductor current in continuous conduction mode (CCM) boost converter. Use Value: Achieves 96% PFC efficiency at full load; soft-start prevents inrush current spikes during hot-swap events. |
| Medical Imaging Power Systems | Avionics 400 Hz Power Converters |
Use Scenario: CT scanner power system requiring ultra-low EMI and precise DC bus regulation. IC Role / Device Role / Timing Role: UC2854AN provides tightly regulated 700 VDC bus with harmonic suppression per IEC 60601-1. Use Value: 5-MHz current amplifier bandwidth maintains <2% current distortion at 400 Hz line frequency. | Use Scenario: Aircraft auxiliary power unit (APU) converting 115 VAC/400 Hz to 270 VDC. IC Role / Device Role / Timing Role: UC2854AN implements active PFC in boost topology with fast transient response to engine RPM changes. Use Value: Wide common-mode MOUT range (–0.3 V to 5.0 V) supports direct high-side shunt sensing without isolation. |
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 |
|---|---|---|---|
| UC2854BDW | Same electrical specs but SOIC-16 package; MSL Level-2, 260°C reflow rating. | Surface-mount assembly; better thermal performance (θJA = 50–130°C/W) on FR4; not suitable for through-hole prototyping. | Select UC2854BDW for volume SMT production where board space and automated assembly are priorities. |
| UC3854AN | 0°C to +70°C temp range; identical pinout and function but lower operating temperature ceiling. | Commercial-grade use only; unsuitable for industrial environments with ambient >70°C or cold-start below –40°C. | Choose UC3854AN only for cost-sensitive, non-industrial applications where extended temperature is unnecessary. |
Compared with UC2854BDW and UC3854AN, UC2854AN offers through-hole reliability and industrial temperature range (–40°C to +85°C) unmatched by the SOIC variant and broader than the commercial UC3854AN - critical for field-deployed power systems.
Availability
UC2854AN is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, telecom rectifier modules, and medical imaging power systems requiring stable component supply and long-term obsolescence management.
Supply support for UC2854AN 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 and system-level integration.
The UCx854 family was engineered specifically for active power factor correction in CCM boost preregulators - targeting high-efficiency, low-harmonic AC/DC conversion in industrial, telecom, and medical power systems.
FAQ
What is the operating temperature range for UC2854AN?
The UC2854AN is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range is confirmed in the Ordering Information table and Recommended Operating Conditions section of the SLUS329E datasheet. The PDIP-16 package supports this range without derating, making UC2854AN suitable for harsh-environment deployments where thermal stability is critical. All electrical characteristics for UC2854AN are specified across this full range.
Does UC2854AN require external slope compensation?
No, UC2854AN does not require external slope compensation. It uses average current-mode control architecture, which inherently maintains stability and low distortion without added compensation ramps. This is explicitly stated in the datasheet's FEATURES section and FUNCTIONAL DESCRIPTION: "Average current mode control maintains stable, low distortion sinusoidal line current without the need for slope compensation, unlike peak current mode control." UC2854AN's 5-MHz current amplifier enables this behavior across its full operating range.
What is the purpose of the PKLMT pin on UC2854AN?
The PKLMT pin on UC2854AN serves as the peak current limit threshold input. It accepts a negative voltage from the current-sense resistor and triggers foldback limiting when the sensed voltage crosses 0 V. As documented in the TERMINAL FUNCTIONS table, PKLMT is connected to the negative side of the sense resistor, and a resistor to VREF offsets the signal to GND. This architecture enables robust overcurrent protection during brownout and low-line conditions, with IMOUT clamped to ≤2 × IAC at all times.
Can UC2854AN be used with a 12-V auxiliary supply for startup?
Yes, UC2854AN supports startup from a 12-V auxiliary supply due to its 10.5 V / 10 V UVLO threshold option. The datasheet confirms this in the ORDERING INFORMATION table and FEATURES list: "UVLO Options (16 V/10 V or 10.5 V/10 V)" and "10.5 V/10 V UVLO option (UC3854B) enables the controller to be powered off of an auxiliary 12-V supply." UC2854AN's part number suffix 'A' denotes the 10.5 V turn-on version, making it compatible with 12-V rail startup without external regulators.
How does the UC2854AN's MOUT pin function in the control loop?
The MOUT pin on UC2854AN functions as both the analog multiplier output and the non-inverting input to the current amplifier. As defined in the TERMINAL FUNCTIONS table, MOUT carries the computed product of IAC, VRMS², and VAO - forming the current command signal. Its –0.3 V to 5.0 V common-mode range allows differential sensing with ISENSE, and its high-impedance nature lets designers configure the current amplifier as a true differential stage to reject ground noise. The datasheet specifies IMOUT ≤ 2 × IAC, ensuring predictable current limiting behavior.
UC2854AN 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
UC2854AN FAQ
1.How can I place an order for UC2854AN through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2854AN 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 UC2854AN reliable?
The price and inventory of UC2854AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2854AN is usually 5 days.
3.What payment methods are accepted for UC2854AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2854AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2854AN?
UC2854AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2854AN 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 UC2854AN?
For technical support, including UC2854AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2854AN requirements.
6.How does Aetrix verify that UC2854AN is sourced from the original manufacturer or authorized distributors?
All UC2854AN 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 UC2854AN meets industry standards.
7.What is the process for return or replacement of UC2854AN?
All UC2854AN units undergo pre-shipment inspection (PSI). If there is an issue with UC2854AN, 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 UC2854AN part is unused and in its original packaging.
Return procedure for UC2854AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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