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Texas Instruments UC3854ADWTR
- Part No.:
- UC3854ADWTR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC3854ADWTR.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
UC3854ADWTR 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 bandwidth, 2.15 V/2.65 V enable threshold, and integrated multiplier with 0 V–5 V VRMS input range. It enables near-unity power factor in offline AC-DC supplies for industrial SMPS and server power supplies.
For engineers reviewing the UC3854ADWTR datasheet, UC3854ADWTR pinout, UC3854ADWTR application, or UC3854ADWTR equivalent, key selection considerations include UVLO turn-on/off thresholds (16 V / 10 V), oscillator frequency set via RSET/CT, peak current limiting via PKLMT, and compatibility with SOIC-16 layout constraints for high-voltage PFC stages.
Technical Context
The UC3854ADWTR implements average current-mode control using a wide-bandwidth (5 MHz) current amplifier and precision analog multiplier to shape line current waveform in phase with line voltage. Its multiplier accepts IAC (current proportional to instantaneous line voltage) and VRMS (RMS-scaled line voltage), then outputs MOUT to drive the current amplifier's non-inverting input.
It integrates a 7.5-V reference, soft-start via SS pin (14 µA internal charge current), gate driver with 1.5-A peak output, and VREF GOOD comparator to prevent false startup. The device operates over 0°C to 70°C and supports world-wide universal input (85–270 VAC) without manual switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Turn-On/Off | 16 V / 10 V - Enables reliable startup from bulk DC after rectification; hysteresis prevents oscillation during brownout. |
| Current Amplifier GBW | 5 MHz - Supports fast transient response and low distortion at 400 Hz avionics inputs; eliminates need for slope compensation. |
| Reference Voltage | 7.5 V ±1% - Stable internal reference for voltage error amplifier and multiplier scaling; reduces external component count. |
| Oscillator Frequency Range | 80–120 kHz - Set by RSET and CT; fixed-frequency operation simplifies EMI filter design and improves system predictability. |
| GTDRV Peak Output Current | 1.5 A - Directly drives MOSFET gates in boost PFC stage without external buffer; supports fast switching up to 200 kHz. |
| VRMS Input Range | 0 V to 5 V - Accepts scaled RMS line voltage; enables accurate feedforward across universal input range (85–270 VAC). |
| IAC Input Offset | ±3 mV - Minimizes line current THD; eliminates need for external zero-crossing compensation resistor used in UC3854 designs. |
Pinout & Package
UC3854ADWTR is housed in a 16-pin SOIC Wide (DW) package with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and MSL Level-2 moisture sensitivity rating (260°C peak reflow). Thermal resistance θJA = 50–130°C/W on FR4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference ground | Common return for all analog and power circuits; requires short, low-inductance connection to minimize noise coupling. |
| PKLMT (Pin 2) | Peak current limit threshold input | Accepts negative voltage from current sense resistor; sets maximum switch current to prevent overcurrent during brownout. |
| CAO (Pin 3) | Current amplifier output | Drives PWM comparator; swings 0.1–7.5 V; directly controls duty cycle to regulate average inductor current. |
| ISENSE (Pin 4) | Inverting current sense input | Connects to low-side current sense resistor; works down to –0.5 V; forms differential pair with MOUT for noise rejection. |
| MOUT (Pin 5) | Multiplier output / current amp non-inverting input | High-impedance node combining multiplier output and current feedback; common-mode range –0.3 V to 5.0 V. |
| IAC (Pin 6) | Instantaneous AC line current input | Current-input pin (not voltage); linearized to 500 mV offset; max 250 µA at 270 VAC for optimal distortion performance. |
| VAO (Pin 7) | Voltage amplifier output | Clamped to 6.0 V internally; drives third multiplier input; eliminates external zener clamp required in UC3854 designs. |
| VRMS (Pin 8) | RMS line voltage input | Accepts 0–5 V RMS-scaled voltage; enables precise line-voltage feedforward for constant power regulation. |
| VREF (Pin 9) | 7.5-V reference output | Stable bandgap reference; powers internal circuits; VREF GOOD comparator ensures GTDRV remains low until stable. |
| ENA (Pin 10) | Enable/disable control input | 2.65 V turn-on / 2.15 V turn-off threshold; internal 10 V clamp; allows external sequencing or fault shutdown. |
| VSENSE (Pin 11) | Voltage feedback input | Connects to output divider; feeds voltage error amplifier; sets regulated DC bus voltage (e.g., 385 V for universal input). |
| RSET (Pin 12) | Oscillator charging current set | Resistor to GND programs oscillator frequency only; no effect on multiplier current limit-simplifies design vs UC3854. |
| SS (Pin 13) | Soft-start timing capacitor node | Internally charged at 14 µA; ramps VAO reference slowly; ensures controlled rise of output voltage and inrush current. |
| CT (Pin 14) | Oscillator timing capacitor | Capacitor to GND sets oscillator ramp frequency; works with RSET to define precise switching frequency. |
| VCC (Pin 15) | Positive supply input | Operates from 10–20 V; clamped at 22 V; supports auxiliary or bootstrap supply; 300 µA startup current reduces resistor loss. |
| GTDRV (Pin 16) | Gate driver output | 1.5-A totem-pole output; drives N-channel MOSFET gate directly; requires ≥5 Ω series resistor to suppress ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates slope compensation requirement and maintains low THD (<3%) across full line/load range. |
| Integrated 7.5-V reference with VREF GOOD comparator | Prevents false gate drive activation before reference stabilizes; removes need for external Schottky diodes on PKLMT/MOUT. |
| Enhanced multiplier linearity and 0 V–5 V VRMS range | Supports accurate RMS feedforward from 85 VAC to 270 VAC without clipping or discontinuity. |
| 5-MHz current amplifier bandwidth | Enables stable operation at 400 Hz line frequency (avionics) and improves transient response in high-power systems. |
| 16 V/10 V UVLO with 6 V hysteresis | Ensures robust startup from bulk DC and clean shutdown during undervoltage; compatible with offline rectified supplies. |
| Internal 6.0-V clamp on VAO output | Removes external zener diode; reduces BOM count and improves reliability in high-volume PFC designs. |
Applications
| Industrial AC-DC Power Supplies | Server & Telecom Rectifiers |
|---|---|
|
Use Scenario: 1–3 kW front-end PFC stage in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Controls boost converter to maintain >0.99 power factor and <3% THD across 85–270 VAC input. Use Value: Meets EN 61000-3-2 Class A harmonic limits without passive filtering; reduces heatsink size by 22% vs passive PFC. |
Use Scenario: Dual-stage 2 kW telecom rectifier with +48 V output and universal AC input. IC Role / Device Role / Timing Role: Serves as primary PFC controller with fixed 100 kHz switching; interfaces with downstream LLC controller via isolated feedback. Use Value: Enables 94% peak efficiency at 230 VAC; soft-start prevents inrush current exceeding 30 A during cold start. |
| Medical Imaging Power Systems | LED Streetlight Drivers |
|
Use Scenario: High-reliability PFC stage in CT scanner power supply requiring 0.99 PF and low EMI. IC Role / Device Role / Timing Role: Implements average current-mode control with 5 MHz current amplifier to suppress 400 Hz harmonics from generator-fed inputs. Use Value: Achieves <1.5% line current THD at 400 Hz; eliminates need for active harmonic cancellation circuitry. |
Use Scenario: Outdoor LED streetlight with 150 W output and surge-rated PFC front-end. IC Role / Device Role / Timing Role: Manages boost PFC under wide ambient temperature (–40°C to +85°C) with 16 V/10 V UVLO. Use Value: Maintains >0.95 PF across full temperature range; integrated VREF GOOD prevents output instability during cold startup. |
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 |
|---|---|---|---|
| UC3854BDWTR | 10.5 V / 10 V UVLO thresholds instead of 16 V / 10 V; optimized for auxiliary 12-V startup. | Suitable for systems with dedicated 12-V bias rail; not recommended for direct bulk DC startup. | Select UC3854BDWTR when powered from an auxiliary supply; UC3854ADWTR is preferred for offline rectified VCC. |
| L6562A | 8-pin SOIC; average current-mode but lower bandwidth (1.5 MHz); no integrated VREF GOOD comparator. | Targeted at cost-sensitive sub-300 W designs; lacks VREF GOOD and 5 MHz current amp for high-THD-critical apps. | Choose L6562A for compact, low-cost PFC in lighting drivers; UC3854ADWTR remains superior for >500 W industrial systems. |
Compared with UC3854BDWTR and L6562A, UC3854ADWTR delivers higher current amplifier bandwidth (5 MHz vs 1.5 MHz), integrated VREF GOOD protection, and 16 V UVLO optimized for direct bulk DC startup-making it the most robust choice for high-power, high-reliability PFC designs.
Availability
UC3854ADWTR is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, server rectifiers, and medical imaging systems requiring stable component supply and long-term manufacturability.
Supply support for UC3854ADWTR 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 high-reliability industrial components.
The UC3854A/B product line was engineered specifically for active power factor correction in high-efficiency AC-DC conversion, targeting applications where harmonic compliance, thermal stability, and design simplicity are critical.
FAQ
What is the operating temperature range for UC3854ADWTR?
The UC3854ADWTR is specified for operation from 0°C to 70°C ambient temperature. This commercial-grade rating aligns with its SOIC-16 DW package and targets industrial and computing power supply applications where ambient conditions remain within this envelope. The device's electrical characteristics-including current amplifier offset, reference accuracy, and oscillator stability-are guaranteed across this full range.
Does UC3854ADWTR require external slope compensation?
No, UC3854ADWTR does not require external slope compensation because it uses average current-mode control architecture. Its 5-MHz current amplifier bandwidth enables inherent stability and low line current distortion (<3% THD) without added compensation components-unlike peak current-mode controllers. This simplifies design and improves reliability in high-power PFC stages.
How is the oscillator frequency set on UC3854ADWTR?
The oscillator frequency of UC3854ADWTR is set by two external components: a resistor (RSET) from Pin 12 to GND and a capacitor (CT) from Pin 14 to GND. Typical values like RSET = 8.2 kΩ and CT = 1.5 nF yield ~100 kHz. The datasheet provides a graph (Figure 7) showing frequency vs. RSET for various CT values, enabling precise tuning across 80–120 kHz.
What is the function of the PKLMT pin on UC3854ADWTR?
The PKLMT (Pin 2) on UC3854ADWTR serves as the peak current limit threshold input. It accepts a negative voltage from the current sense resistor's low-side terminal. When this voltage crosses 0 V (with 15 mV offset tolerance), the controller terminates the switching cycle to prevent overcurrent. This provides foldback limiting during brownout or low-line conditions.
Can UC3854ADWTR be used in 400 Hz avionics power systems?
Yes, UC3854ADWTR is explicitly qualified for 400 Hz line frequency applications due to its 5-MHz current amplifier bandwidth and stable average current-mode control. The improved amplifier offset (0 V ±3 mV) and extended common-mode range ensure low THD and robust regulation even at high line frequencies-making it suitable for military and aerospace PFC designs.
UC3854ADWTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
UC3854ADWTR FAQ
1.How can I place an order for UC3854ADWTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3854ADWTR 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 UC3854ADWTR reliable?
The price and inventory of UC3854ADWTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3854ADWTR is usually 5 days.
3.What payment methods are accepted for UC3854ADWTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3854ADWTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3854ADWTR?
UC3854ADWTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3854ADWTR 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 UC3854ADWTR?
For technical support, including UC3854ADWTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3854ADWTR requirements.
6.How does Aetrix verify that UC3854ADWTR is sourced from the original manufacturer or authorized distributors?
All UC3854ADWTR 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 UC3854ADWTR meets industry standards.
7.What is the process for return or replacement of UC3854ADWTR?
All UC3854ADWTR units undergo pre-shipment inspection (PSI). If there is an issue with UC3854ADWTR, 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 UC3854ADWTR part is unused and in its original packaging.
Return procedure for UC3854ADWTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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