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Texas Instruments UC2854ANG4
- Part No.:
- UC2854ANG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UC2854ANG4.pdf
- Description:
- IC PFC CTR AV CURR 200KHZ 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,474
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Product details
Overview
UC2854ANG4 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/10 V, and operates across –40°C to 85°C. It enables near-unity power factor in AC/DC front-end supplies for industrial SMPS and server power units.
For engineers reviewing the UC2854ANG4 datasheet, UC2854ANG4 pinout, UC2854ANG4 application, or UC2854ANG4 equivalent, key selection criteria include its average current-mode control architecture, integrated multiplier with 0 V–5 V VRMS input range, clamped VAO output, and compatibility with offline universal-input (85–270 VAC) PFC stages requiring <3% line current distortion.
Technical Context
The UC2854ANG4 implements analog multiplier-based average current-mode control: IAC current input feeds a squaring circuit (VRMS²), multiplied by VAO error amplifier output to generate MOUT command current. This drives the current amplifier (CAO), which compares against ISENSE to regulate MOSFET duty cycle via GTDRV.
Its oscillator uses RSET and CT to set frequency (80–120 kHz typical); PKLMT enables peak current limiting with offset compensation; SS provides soft-start via internal 14-µA charge current; and ENA offers fast disable with 2.55 V threshold and 600 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO | 10.5 V turn-on / 10 V turn-off - supports startup from auxiliary 12-V rail without external regulator |
| Current Amplifier GBW | 5 MHz - enables stable high-bandwidth current loop for 400 Hz avionics or fast line transients |
| Reference Voltage | 7.5 V ±1.5% - precision internal reference for voltage error amplifier and system biasing |
| GTDRV Output | 1.5-A peak sink/source - directly drives MOSFET gates in boost PFC without external buffer |
| VRMS Input Range | 0 V to 5 V - accommodates wide-range RMS-sensed line voltage dividers (e.g., 1.5 V at 85 VAC → 4.77 V at 270 VAC) |
| Startup Supply Current | 250 µA typical - reduces power loss and thermal stress in high-voltage startup resistor networks |
| MOUT Common-Mode Range | –0.3 V to 5.0 V - allows differential current sensing with negative-side shunt placement and noise rejection |
Pinout & Package
UC2854ANG4 is supplied in a 16-pin plastic dual in-line package (PDIP-N), RoHS-compliant with NIPDAU lead finish, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference | Common return for all analog and power circuits; requires short, low-inductance connection to PCB ground plane |
| PKLMT (Pin 2) | Peak current limit threshold | Accepts negative voltage from current-sense resistor; 0 V threshold enables foldback limiting during brownout |
| CAO (Pin 3) | Current amplifier output | Drives PWM comparator; 0.1–7.5 V swing sets duty cycle; high-impedance node sensitive to layout |
| ISENSE (Pin 4) | Inverting current sense input | Connects to shunt resistor low side; functional down to –0.5 V; differential pair with MOUT rejects GND noise |
| MOUT (Pin 5) | Multiplier output / CA+ input | High-impedance current output; tied to CAO feedback path; IMOUT ≤ 2 × IAC ensures predictable gain scaling |
| IAC (Pin 6) | Line voltage proportional current | Receives scaled AC line current; regulated to 500 mV offset eliminates zero-crossing compensation resistor |
| VAO (Pin 7) | Voltage amplifier output | Error amplifier output; internally clamped to 6.0 V; forms third multiplier input with 1.5 V offset |
| VRMS (Pin 8) | RMS line voltage input | 0–5 V linear range; feeds squaring circuit; eliminates discontinuities vs. UC3854's linear approximation |
| VREF (Pin 9) | 7.5-V reference output | Stable bias source for feedback divider and internal circuits; 25–60 mA short-circuit capability |
| ENA (Pin 10) | Enable/disable control | 2.55 V threshold with 600 mV hysteresis; internal 10 V clamp prevents overvoltage damage |
| VSENSE (Pin 11) | Voltage feedback input | Inverting input to voltage amplifier; monitors DC bus via resistive divider; sets output regulation point |
| RSET (Pin 12) | Oscillator charging current | Sets CT charging current only; decoupled from multiplier current limit - simplifies frequency tuning |
| SS (Pin 13) | Soft-start control | Internally charged at 14 µA; controls VAO reference ramp; discharges rapidly on fault for fast recovery |
| CT (Pin 14) | Oscillator timing capacitor | Connected to GND; defines switching frequency with RSET; ramp valley = 0.8–1.3 V, peak = 4.9–5.9 V |
| VCC (Pin 15) | Supply voltage input | 10–20 V operating range; 22 V absolute max; internal 20 V clamp enables current-fed supply options |
| GTDRV (Pin 16) | Gate driver output | Totem-pole MOSFET driver; 12.8 V VOH / 2.2 V VOL @ 200 mA; 35 ns rise/fall; requires ≥5 Ω series gate resistor |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates slope compensation requirement and maintains low-distortion sinusoidal line current without instability |
| Integrated multiplier with 500-mV IAC offset | Removes external zero-crossing compensating resistor, reducing component count and improving temperature stability |
| Clamped VAO output (6.0 V) | Replaces external zener clamp, simplifying voltage amplifier compensation and improving transient recovery |
| VREF GOOD comparator | Ensures GTDRV remains low until 7.5-V reference stabilizes - eliminates need for external Schottky diodes on PKLMT/MOUT |
| Enhanced MOUT common-mode range (–0.3 V to 5.0 V) | Supports high-amplitude current sensing signals and improves noise immunity in high-power boost designs |
Applications
| Industrial AC/DC Power Supplies | Server and Telecom Rectifiers |
|---|---|
Use Scenario: 3 kW universal-input (85–270 VAC) front-end rectifier with 400 VDC output bus. IC Role / Device Role / Timing Role: UC2854ANG4 acts as the average current-mode PFC controller, shaping input current to match line voltage waveform and regulating DC bus voltage. Use Value: Achieves <3% THD and >0.99 power factor across full load and line range, meeting IEC 61000-3-2 Class A compliance. | Use Scenario: Redundant 12 V/–48 V telecom rectifier module with active PFC stage. IC Role / Device Role / Timing Role: UC2854ANG4 manages boost converter duty cycle via GTDRV, using VRMS feedforward and VSENSE feedback to maintain stable 380 VDC intermediate bus. Use Value: Enables world-wide operation without manual voltage switches and supports hold-up time extension via precise power limiting. |
| Medical Equipment Power Modules | LED Driver Front-Ends |
Use Scenario: 1.5 kW isolated AC/DC power supply for diagnostic imaging systems requiring low EMI and high reliability. IC Role / Device Role / Timing Role: UC2854ANG4 controls the boost PFC stage, coordinating with downstream LLC resonant controller via shared DC bus monitoring. Use Value: 5-MHz current amplifier bandwidth ensures robust response to rapid line sags and surges common in hospital-grade power infrastructure. | Use Scenario: High-bay LED streetlight driver with universal AC input and 400 VDC constant-current output. IC Role / Device Role / Timing Role: UC2854ANG4 regulates boost PFC stage to deliver clean, regulated DC bus to downstream buck-boost LED current controller. Use Value: Integrated soft-start (SS) and fast disable (<300 ns) prevent inrush current and enable graceful shutdown during grid flicker events. |
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 |
|---|---|---|---|
| UC2854BN | Same PDIP-16 package and electrical specs; differs only in part marking and RoHS status (NIPDAU vs. SNPB), no functional difference | Identical operating temperature range (–40°C to 85°C) and pinout; suitable for same board layouts and BOMs | Select UC2854BN if legacy non-RoHS procurement is required; otherwise UC2854ANG4 preferred for RoHS compliance |
| UC3854ADW | SOIC-16 package; wider operating temp (0°C to 70°C); identical core functionality but lower thermal rating and different UVLO (16 V/10 V) | Not suitable for industrial environments below 0°C; requires PCB redesign due to SOIC footprint and thermal pad considerations | Choose UC3854ADW only for commercial-temp consumer applications where space constraints favor SOIC and ambient stays above freezing |
Compared with UC2854BN, UC2854ANG4 offers RoHS compliance without performance trade-offs; compared with UC3854ADW, it delivers extended temperature operation and higher reliability in demanding industrial PFC stages.
Availability
UC2854ANG4 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, server rectifiers, and medical equipment power modules requiring stable component supply and long-term design continuity.
Supply support for UC2854ANG4 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs and industrial control solutions.
The UC2854x family belongs to TI's advanced power factor correction controller product line, engineered specifically for high-efficiency, low-distortion boost preregulators in universal-input AC/DC systems.
FAQ
What is the operating temperature range for UC2854ANG4?
The UC2854ANG4 is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in harsh environments such as factory automation power supplies and outdoor telecom rectifiers. The device's thermal resistance (θJA ≈ 90°C/W for PDIP) and internal thermal protection ensure reliable performance within this envelope when mounted on standard FR4 PCBs with adequate copper area.
Does UC2854ANG4 require external slope compensation?
No, UC2854ANG4 does not require external slope compensation because it uses average current-mode control instead of peak current-mode control. Its architecture inherently maintains loop stability and low line current distortion across all operating conditions. This eliminates the need for additional compensation components, simplifying design and improving consistency in production builds of UC2854ANG4-based PFC stages.
How does the UC2854ANG4 handle brownout conditions?
The UC2854ANG4 handles brownout conditions through foldback power limiting: IMOUT is clamped to 2 × IAC at all times, and PKLMT enables dynamic peak current reduction when VCC drops near UVLO thresholds. During low-line events, this preserves regulation while preventing overcurrent stress on the boost switch. The 10.5 V/10 V UVLO ensures graceful restart once input recovers, avoiding latch-up or erratic behavior in UC2854ANG4-controlled systems.
Can UC2854ANG4 be used with a high-side current sense configuration?
UC2854ANG4 is optimized for low-side current sensing via ISENSE and MOUT, both functional down to –0.5 V relative to GND. While high-side sensing is technically possible with level-shifting circuitry, it adds complexity and degrades noise immunity. TI's reference designs and functional description emphasize low-side shunt placement to leverage the UC2854ANG4's differential input capability and avoid violating the –0.5 V absolute minimum on ISENSE/MOUT pins.
What is the purpose of the RSET pin on UC2854ANG4?
The RSET pin on UC2854ANG4 programs only the oscillator charging current - unlike earlier UC3854 variants, it no longer affects multiplier output current limiting. This decoupling simplifies frequency tuning: selecting RSET and CT sets switching frequency (80–120 kHz) independently of power-limiting behavior. For UC2854ANG4 designs, RSET value directly determines CT ramp rate and thus oscillator accuracy and stability without impacting PFC loop gain or current limit thresholds.
UC2854ANG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
UC2854ANG4 FAQ
1.How can I place an order for UC2854ANG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2854ANG4 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 UC2854ANG4 reliable?
The price and inventory of UC2854ANG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2854ANG4 is usually 5 days.
3.What payment methods are accepted for UC2854ANG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2854ANG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2854ANG4?
UC2854ANG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2854ANG4 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 UC2854ANG4?
For technical support, including UC2854ANG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2854ANG4 requirements.
6.How does Aetrix verify that UC2854ANG4 is sourced from the original manufacturer or authorized distributors?
All UC2854ANG4 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 UC2854ANG4 meets industry standards.
7.What is the process for return or replacement of UC2854ANG4?
All UC2854ANG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC2854ANG4, 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 UC2854ANG4 part is unused and in its original packaging.
Return procedure for UC2854ANG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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