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Texas Instruments UC3854ANG4
- Part No.:
- UC3854ANG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UC3854ANG4.pdf
- Description:
- IC PFC CTR AV CURR 200KHZ 16DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
UC3854ANG4 from Texas Instruments is a fixed-frequency average current-mode power factor correction (PFC) controller IC designed for boost preregulator topologies. It delivers near-unity power factor, limits line current distortion to <3%, features a 7.5-V reference, 5-MHz current amplifier bandwidth, and operates across 0°C to 70°C with 10.5 V/10 V UVLO thresholds. It enables world-wide AC input operation without hardware switches in offline SMPS front-ends.
For engineers reviewing the UC3854ANG4 datasheet, UC3854ANG4 pinout, UC3854ANG4 application, or UC3854ANG4 equivalent, key selection considerations include its average current-mode control architecture, integrated multiplier with 0–5 V VRMS common-mode range, 1.5-A gate driver output, soft-start via SS pin, and compatibility with standard boost PFC designs requiring stable 7.5-V reference and precise peak current limiting.
Technical Context
The UC3854ANG4 implements average current-mode control using a high-bandwidth (5 MHz) current amplifier and analog multiplier that accepts IAC (line voltage proportional current), VRMS (RMS-scaled voltage), and VAO (voltage error amplifier output) to generate a sinusoidal current command. Its multiplier gain constant is –1.0 A/A (typical) with improved linearity and 500 mV VAC offset eliminating external zero-crossing compensation resistors.
It integrates a 7.5-V reference with ±15 mV tolerance, oscillator with 80–120 kHz frequency range (set by RSET/CT), clamped VAO output (0–6 V), and GTDRV gate driver capable of 1.5-A peak sink/source. The device supports brownout foldback via IMOUT ≤ 2 × IAC current limiting and includes VREF GOOD comparator to prevent false startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 10 V to 20 V - Supports direct rectified AC input or auxiliary supply; UVLO turn-on at 10.5 V ensures reliable startup from 12-V rails. |
| Reference Voltage | 7.5 V ±15 mV - Precision internal reference used for voltage feedback scaling, multiplier biasing, and PKLMT offset setting. |
| Oscillator Frequency | 80–120 kHz - Fixed-frequency operation set by RSET/CT; initial accuracy ±15% enables predictable EMI filtering and transformer design. |
| Current Amplifier GBW | 5 MHz - Enables low-distortion current shaping even at 400 Hz avionics line frequencies; eliminates need for slope compensation. |
| GTDRV Output Drive | 1.5-A peak - Directly drives MOSFET gates in boost PFC stages without external buffers; requires ≥5 Ω series gate resistor for stability. |
| VRMS Input Range | 0 V to 5.5 V - Accepts wide-range RMS-scaled AC input (e.g., 1.5 V at 85 VAC → 4.77 V at 270 VAC), simplifying divider network design. |
| Enable Threshold | 2.55 V (typical) - Precise ENA activation point with 600 mV hysteresis prevents chatter during marginal supply conditions. |
Pinout & Package
UC3854ANG4 is housed in a 16-pin plastic dual in-line package (PDIP-N), RoHS-compliant with NIPDAU lead finish, rated for 0°C to 70°C operation, and supplied in tube packaging (25 units).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power and signal reference ground | Common return for all analog and power circuits; requires short, low-inductance connection to minimize noise coupling into ISENSE/MOUT. |
| 2 PKLMT | Peak current limit threshold input | Accepts negative voltage from current sense resistor; 0 V threshold enables accurate foldback limiting during brownout conditions. |
| 3 CAO | Current amplifier output | Drives PWM comparator; swings 0.1–7.5 V; serves as current command signal for average-mode control loop. |
| 4 ISENSE | Inverting current sense input | High-impedance input to current amplifier; functional down to –0.5 V; used with MOUT to form differential current sensing node. |
| 5 MOUT | Multiplier output / current amp non-inverting input | High-impedance current output (–220 µA typ); connects directly to ISENSE to close current loop; IMOUT ≤ 2 × IAC enforces inherent power limiting. |
| 6 IAC | Line voltage proportional current input | Accepts current-sourced line voltage signal; internally regulated to 500 mV offset; eliminates external zero-crossing compensation resistor. |
| 7 VAO | Voltage amplifier output | Clamped to 0–6 V; third multiplier input; replaces external zener clamp required in UC3854 designs. |
| 8 VRMS | RMS-scaled AC line voltage input | 0–5.5 V linear range; feeds squaring circuit; enables wide universal input (85–270 VAC) without range switching. |
| 9 VREF | 7.5-V precision reference output | Stable reference for feedback divider, PKLMT offset, and internal circuitry; short-circuit current 25–60 mA. |
| 10 ENA | Enable/disable control input | 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 voltage via resistor divider; sets regulation point for PFC output. |
| 12 RSET | Oscillator charging current set | Resistor-to-ground programs oscillator frequency; decoupled from multiplier current limiting (unlike UC3854). |
| 13 SS | Soft-start timing capacitor node | Internally sourced 14 µA current charges external capacitor; controls ramp rate of VAO reference to limit inrush current. |
| 14 CT | Oscillator timing capacitor node | Capacitor-to-ground sets oscillator frequency with RSET; ramp amplitude 4.9–5.9 V peak-to-peak. |
| 15 VCC | Positive supply input | 10–20 V operation; 20 V clamp protects against transients; 300 µA startup current reduces burden on auxiliary supplies. |
| 16 GTDRV | Gate driver output | 1.5-A peak totem-pole output; drives MOSFET gate directly; rise/fall time 35 ns (1 nF load); requires series gate resistor ≥5 Ω. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates slope compensation requirement and enables stable, low-distortion sinusoidal line current shaping without instability at high duty cycles. |
| Integrated 5-MHz current amplifier | Reduces line current THD below 3% even at 400 Hz input; offsets trimmed to 0 ±3 mV (vs. ±4 mV in UC3854) for improved zero-current accuracy. |
| Enhanced multiplier with 0–5 V VRMS range | Supports full universal AC input (85–270 VAC) with single resistor divider; eliminates discontinuities and improves accuracy vs. linear approximations. |
| VREF GOOD comparator | Prevents GTDRV activation until 7.5-V reference stabilizes, removing need for external Schottky diodes on PKLMT/MOUT pins. |
| 10.5 V/10 V UVLO option | Enables direct startup from 12-V auxiliary supplies; avoids bulky offline startup resistors and reduces standby power loss. |
Applications
| Industrial Motor Drives | Server Power Supplies |
|---|---|
|
Use Scenario: Three-phase motor drive front-end with active PFC stage feeding 400-V DC bus. IC Role / Device Role / Timing Role: UC3854ANG4 configures boost converter to shape AC input current, regulate 400-V DC bus, and maintain >0.99 power factor across 30–100% load. Use Value: Reduces harmonic injection into facility wiring, meets IEC 61000-3-2 Class A limits, and improves system efficiency by minimizing RMS current losses. |
Use Scenario: 1 kW redundant ATX-style server PSU with universal AC input (90–264 VAC). IC Role / Device Role / Timing Role: UC3854ANG4 controls interleaved boost PFC to deliver stable 380-V DC bus with fast transient response and soft-start sequencing. Use Value: Enables compliance with 80 PLUS Titanium efficiency requirements and eliminates need for manual voltage range switches or multiple PFC controllers. |
| Medical Imaging Equipment | Telecom Rectifiers |
|
Use Scenario: CT scanner power system requiring low EMI, high reliability, and immunity to line sags. IC Role / Device Role / Timing Role: UC3854ANG4 implements foldback-limited PFC with VREF GOOD monitoring and 300-µA startup current for auxiliary-supply-derived operation. Use Value: Ensures uninterrupted operation during brownouts; reduces conducted emissions via fixed-frequency control; supports long-life electrolytic capacitor selection. |
Use Scenario: -48 V telecom rectifier module with hot-swap capability and high-density layout constraints. IC Role / Device Role / Timing Role: UC3854ANG4 drives compact boost stage with SOIC-compatible footprint (via pin-compatible UC3854ADW alternative) and integrated gate driver. Use Value: Minimizes BOM count by integrating reference, oscillator, amplifiers, and driver; simplifies thermal design with 1.5-A GTDRV eliminating external drivers. |
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 |
|---|---|---|---|
| UC3854ADW | Same electrical specs and pinout; SOIC-16 package instead of PDIP-16; RoHS-compliant NIPDAU finish; MSL Level-2 reflow rating. | Preferred for surface-mount production; requires PCB reflow profile compliance; not suitable for through-hole prototyping or socket-based testing. | Select UC3854ADW for volume SMT manufacturing where board space and automated assembly are priorities. |
| UC3854BDW | Identical SOIC-16 package but with 16 V/10 V UVLO (vs. 10.5 V/10 V); higher turn-on threshold enables direct rectified AC startup without auxiliary supply. | Suitable for offline-only designs without 12-V aux rail; less tolerant of low-line brownout conditions than UC3854ANG4. | Choose UC3854BDW when primary supply is rectified AC and no auxiliary 12-V source exists. |
Compared with UC3854ADW and UC3854BDW, the UC3854ANG4 offers through-hole PDIP packaging for lab validation and legacy systems, 10.5 V UVLO for auxiliary-supply compatibility, and identical core PFC functionality-making it optimal for development, repair, and cost-sensitive industrial designs where SMT infrastructure is unavailable.
Availability
UC3854ANG4 is available at Aetrix Electronics and suitable for industrial motor drives, server power supplies, medical imaging equipment, and telecom rectifiers requiring stable component supply with long lifecycle support and traceable sourcing.
Supply support for UC3854ANG4 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 and embedded processing technologies, with decades of expertise in power management ICs and industrial-grade controllers.
The UC3854 family was developed specifically for active power factor correction in offline switch-mode power supplies, targeting high-efficiency, low-harmonic, universal-input AC-DC conversion in industrial, computing, and medical applications.
FAQ
What is the operating temperature range for the UC3854ANG4?
The UC3854ANG4 is specified for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with its PDIP packaging and target applications in server PSUs and industrial power supplies where forced-air cooling is typical. Derating guidelines apply above 50°C case temperature, and thermal resistance (θJA ≈ 90°C/W) must be considered in layout design.
Does the UC3854ANG4 require external slope compensation?
No, the UC3854ANG4 does not require external slope compensation because it uses average current-mode control instead of peak current-mode control. Its integrated 5-MHz current amplifier directly compares sensed inductor current with a reconstructed sinusoidal command, enabling stable operation across full duty cycle range without added compensation components.
How does the UC3854ANG4 achieve near-unity power factor?
The UC3854ANG4 achieves near-unity power factor by multiplying three signals-line voltage (IAC), RMS-scaled voltage (VRMS), and output voltage error (VAO)-to generate a sinusoidal current command. This command forces the boost inductor current to track the AC input voltage waveform, resulting in THD <3% and PF >0.99 under full-load conditions.
Can the UC3854ANG4 be used with a 12-V auxiliary supply?
Yes, the UC3854ANG4 supports startup from a 12-V auxiliary supply due to its 10.5 V/10 V UVLO threshold. When VCC rises above 10.5 V, the device enables; it remains active until VCC drops below 10 V. This eliminates the need for high-voltage startup resistors and reduces standby power consumption in systems with dedicated 12-V rails.
What is the purpose of the VREF GOOD comparator in the UC3854ANG4?
The VREF GOOD comparator in the UC3854ANG4 monitors the 7.5-V reference voltage and holds GTDRV low until VREF stabilizes. This prevents premature MOSFET switching during power-up, eliminating the need for external Schottky diodes on PKLMT and MOUT pins-reducing component count and improving reliability in UC3854ANG4-based designs.
UC3854ANG4 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
UC3854ANG4 FAQ
1.How can I place an order for UC3854ANG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3854ANG4 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 UC3854ANG4 reliable?
The price and inventory of UC3854ANG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3854ANG4 is usually 5 days.
3.What payment methods are accepted for UC3854ANG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3854ANG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3854ANG4?
UC3854ANG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3854ANG4 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 UC3854ANG4?
For technical support, including UC3854ANG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3854ANG4 requirements.
6.How does Aetrix verify that UC3854ANG4 is sourced from the original manufacturer or authorized distributors?
All UC3854ANG4 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 UC3854ANG4 meets industry standards.
7.What is the process for return or replacement of UC3854ANG4?
All UC3854ANG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3854ANG4, 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 UC3854ANG4 part is unused and in its original packaging.
Return procedure for UC3854ANG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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