My Inquiry
My Account
Texas Instruments UC2854BDWTRG4
- Part No.:
- UC2854BDWTRG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC2854BDWTRG4.pdf
- Description:
- IC PFC CTR AVERAGE 120KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,619
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UC2854BDWTRG4 from Texas Instruments is a high-performance average current-mode power factor correction (PFC) controller IC designed for boost preregulator topologies. It delivers near-unity power factor, <3% line current distortion, and features a 5 MHz current amplifier, 7.5 V reference, and integrated multiplier with 0 V to 5 V VRMS input range. It operates across –40°C to +85°C and supports worldwide AC input without hardware switches.
For engineers reviewing the UC2854BDWTRG4 datasheet, UC2854BDWTRG4 pinout, UC2854BDWTRG4 application, or UC2854BDWTRG4 equivalent, key selection considerations include UVLO thresholds (10.5 V turn-on / 10 V turn-off), 16-pin SOIC-DW package compatibility, fixed-frequency oscillator accuracy (±15%), gate driver peak output (1.5 A), and PFC-specific functions including VRMS squaring, MOUT/ISENSE differential sensing, and PKLMT-based overcurrent protection.
Technical Context
The UC2854BDWTRG4 implements average current-mode control using a high-bandwidth (5 MHz) current amplifier and precision analog multiplier to shape sinusoidal line current in phase with AC voltage. Its multiplier accepts IAC (current proportional to instantaneous line voltage) and VRMS (RMS-scaled line voltage) inputs, producing MOUT as both multiplier output and non-inverting current amplifier input - enabling accurate current command generation without slope compensation.
It integrates a 7.5 V reference with ±15 mV tolerance, soft-start via SS pin (14 µA internal charge current), and a 1.5-A totem-pole GTDRV output optimized for MOSFET gate driving. The device uses RSET to set oscillator charging current only, decoupling timing from power limiting - which is now fixed at ≤2 × IAC - simplifying brownout foldback design and eliminating external clamping components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Turn-on / Turn-off | 10.5 V / 10 V - Enables startup from auxiliary 12-V supply; eliminates need for offline resistor divider. |
| Current Amplifier GBW | 5 MHz - Supports low-distortion PFC at 400 Hz avionics inputs and improves transient response. |
| Reference Voltage | 7.5 V ±15 mV - Stable internal reference for voltage error amplifier and system biasing. |
| Oscillator Frequency Range | 80–120 kHz - Fixed-frequency operation with ±15% initial accuracy; set by CT and RSET. |
| GTDRV Peak Output Current | 1.5 A - Directly drives MOSFET gates in boost PFC stages without external buffer. |
| VRMS Input Range | 0 V to 5 V - Accepts wide-range RMS-scaled line voltage for global 85–270 VAC operation. |
| IAC Input Offset | ≤±3 mV - Minimizes line current THD; eliminates need for external zero-crossing compensation. |
Pinout & Package
UC2854BDWTRG4 is housed in a 16-pin SOIC (DW) package with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and MSL Level-2 moisture sensitivity rating (260°C reflow).
| 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. |
| PKLMT (Pin 2) | Peak current limit threshold input | Accepts negative sense voltage from current-sense resistor; 0 V threshold enables precise overcurrent shutdown. |
| CAO (Pin 3) | Current amplifier output | Drives PWM comparator; swings 0.1–7.5 V; serves as current command signal for boost switch duty cycle. |
| ISENSE (Pin 4) | Inverting current sense input | Connects to low-side current-sense resistor; functional down to –0.5 V; forms differential pair with MOUT. |
| MOUT (Pin 5) | Multiplier output / current amp non-inverting input | High-impedance node combining multiplier result and current feedback path; common-mode range –0.3 to 5.0 V. |
| IAC (Pin 6) | Instantaneous AC line current input | Current-input pin (not voltage); scaled to ≤250 µA max; low 500 mV offset eliminates external compensation. |
| VAO (Pin 7) | Voltage amplifier output | Clamped to 6.0 V internally; drives third multiplier input; replaces external zener clamp in legacy designs. |
| VRMS (Pin 8) | RMS line voltage input | Accepts 0–5 V analog RMS representation; enables feedforward control for constant power regulation. |
| VREF (Pin 9) | 7.5 V reference output | Stable bandgap reference; powers internal circuitry; must be present for device operation. |
| ENA (Pin 10) | Enable/disable control input | 2.55 V nominal threshold; 600 mV hysteresis; fast 300 ns disable propagation for fault response. |
| VSENSE (Pin 11) | Voltage feedback input | Connects to output voltage divider; feeds voltage error amplifier for output regulation loop. |
| RSET (Pin 12) | Oscillator charging current set | Resistor-to-ground sets oscillator frequency only; no effect on multiplier current limiting. |
| SS (Pin 13) | Soft-start timing capacitor node | Internally charged at 14 µA; controls ramp-up of voltage amplifier reference during startup. |
| CT (Pin 14) | Oscillator timing capacitor node | Capacitor-to-ground sets oscillator frequency with RSET; ramp valley = 0.8–1.3 V, peak = 4.9–5.9 V. |
| VCC (Pin 15) | Positive supply input | Operates from 10–20 V; clamped at 20 V; supports current-fed startup configurations. |
| GTDRV (Pin 16) | Gate driver output | 1.5-A totem-pole output; 35 ns rise/fall times into 1 nF; requires ≥5 Ω series gate resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates slope compensation requirement and ensures stable, low-THD sinusoidal line current across full load and line range. |
| Integrated 7.5 V reference with VREF GOOD comparator | Ensures GTDRV remains low until reference stabilizes - removes need for external Schottky diodes on PKLMT/MOUT. |
| Enhanced multiplier with 0 V–5 V VRMS range | Supports 85–270 VAC universal input with single resistor divider; eliminates discontinuities from linear approximations. |
| Low-offset current amplifier (≤±3 mV) | Reduces line current distortion at light loads and enables accurate zero-current detection without external nulling networks. |
| UVLO options (10.5 V/10 V) | Enables direct operation from 12-V auxiliary supplies - ideal for systems with standby rails or multi-rail PSUs. |
| 1.5-A gate driver with fast switching | Directly drives medium-power MOSFETs in boost PFC stages; 35 ns edge speeds support >100 kHz operation. |
Applications
| Server Power Supply | Industrial Motor Drive |
|---|---|
|
Use Scenario: 1 kW+ ATX or redundant server PSU requiring 80 PLUS Titanium compliance. IC Role / Device Role / Timing Role: Primary PFC controller managing boost stage to achieve >0.99 PF and <3% THD at full load. Use Value: Enables single-stage PFC with minimal external components - reduces BOM count by eliminating slope compensation and external reference clamps. |
Use Scenario: Variable-frequency drive with regenerative braking requiring stable DC bus under fluctuating grid conditions. IC Role / Device Role / Timing Role: Front-end PFC regulator maintaining regulated 700 VDC bus despite 400 Hz or distorted 3-phase input. Use Value: 5 MHz current amplifier bandwidth ensures accurate current shaping even at 400 Hz line frequency - critical for aerospace and marine VFDs. |
| Medical Imaging PSU | LED Streetlight Driver |
|
Use Scenario: High-reliability CT/MRI power system needing low EMI, low THD, and fail-safe shutdown. IC Role / Device Role / Timing Role: Active PFC controller with VREF GOOD monitoring and fast 300 ns disable path for safety-critical interruption. Use Value: Integrated VREF GOOD comparator prevents false gate drive during brownout - avoids uncontrolled boost switch conduction. |
Use Scenario: Outdoor LED streetlight with universal AC input and thermal derating requirements. IC Role / Device Role / Timing Role: PFC front-end in two-stage topology, delivering regulated bus to downstream LLC resonant converter. Use Value: 10.5 V/10 V UVLO allows startup from onboard 12-V bias rail - eliminates high-voltage startup resistor and associated power loss. |
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 |
|---|---|---|---|
| UC2854ADWTRG4 | Higher UVLO (16 V/10 V); no VREF GOOD comparator; lower current amplifier bandwidth (typ. 3 MHz). | Targeted for offline 230 VAC-only systems; lacks fail-safe reference monitoring for medical/safety-critical use. | Select UC2854ADWTRG4 only when operating exclusively from high-line mains and cost optimization outweighs reliability enhancements. |
| UCC28180DR | Current-mode PFC controller with integrated 600 V startup FET; 1.5 A gate driver; no multiplier - uses digital feedforward. | Designed for simplified single-chip PFC with reduced external component count; supports CRM/CCM modes. | Choose UCC28180DR when minimizing BOM and board space is prioritized over analog multiplier flexibility and legacy design reuse. |
Compared with UC2854ADWTRG4, the UC2854BDWTRG4 provides superior safety monitoring and higher bandwidth for demanding line conditions; versus UCC28180DR, it retains full analog multiplier configurability for custom feedforward tuning but requires more external components.
Availability
UC2854BDWTRG4 is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, medical imaging PSUs, and outdoor LED lighting systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for UC2854BDWTRG4 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 decades of expertise in power conversion ICs.
The UC2854B product line was engineered specifically for high-efficiency, high-reliability active power factor correction in industrial, computing, and medical power supplies - emphasizing low THD, robust fault handling, and design reuse across global AC line standards.
FAQ
What is the UVLO behavior of the UC2854BDWTRG4?
The UC2854BDWTRG4 features a 10.5 V turn-on and 10 V turn-off undervoltage lockout (UVLO) threshold. This dual-threshold hysteresis enables reliable startup from a 12-V auxiliary supply and prevents oscillation during brownout conditions. The 0.5 V hysteresis ensures stable enable/disable transitions without chatter, making UC2854BDWTRG4 suitable for systems where primary rail sequencing depends on secondary bias rails.
How does the UC2854BDWTRG4 implement average current-mode control without slope compensation?
The UC2854BDWTRG4 achieves stable average current-mode control through its high-gain (80–110 dB), wide-bandwidth (5 MHz) current amplifier and precision analog multiplier architecture. Unlike peak current-mode controllers, it directly compares the sensed inductor current (via ISENSE and MOUT) to a continuous command signal (CAO), eliminating subharmonic oscillation risk and removing the need for external slope compensation networks - a key advantage confirmed in UC2854BDWTRG4 application notes SLUA144 and SLUA177.
Can the UC2854BDWTRG4 operate with 400 Hz input, such as in avionics applications?
Yes, the UC2854BDWTRG4 is explicitly validated for 400 Hz operation due to its 5 MHz current amplifier bandwidth and improved common-mode input range (–0.3 V to 5.0 V on MOUT). This allows accurate current sensing and shaping at higher line frequencies where legacy UC3854 derivatives exhibit instability or increased THD - a capability documented in the UC2854BDWTRG4 datasheet's Functional Description section and confirmed in TI application note SLUA177.
What is the purpose of the VREF GOOD comparator in the UC2854BDWTRG4?
The VREF GOOD comparator in the UC2854BDWTRG4 monitors the internal 7.5 V reference and forces GTDRV low until VREF reaches regulation. This prevents unintended MOSFET switching during power-up or brownout events - eliminating the need for external Schottky diodes on PKLMT and MOUT pins required in UC3854 designs. This feature enhances system safety and reliability, especially in medical and industrial applications where uncontrolled gate drive poses critical risks.
How is oscillator frequency set on the UC2854BDWTRG4, and what role does RSET play?
Oscillator frequency on the UC2854BDWTRG4 is set by the combination of CT (timing capacitor to GND) and RSET (resistor from RSET pin to GND). RSET controls only the oscillator charging current - unlike earlier UC3854 versions, it has no effect on multiplier output current limiting, which is now fixed at ≤2 × IAC. This decoupling simplifies design, improves brownout foldback predictability, and removes a source of interaction between timing and power limiting in UC2854BDWTRG4 implementations.
UC2854BDWTRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Mode:
- Average Current
- Frequency - Switching:
- 80kHz ~ 120kHz
- Current - Startup:
- 250 µA
- Voltage - Supply:
- 10V ~ 20V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UC2854BDWTRG4 FAQ
1.How can I place an order for UC2854BDWTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2854BDWTRG4 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 UC2854BDWTRG4 reliable?
The price and inventory of UC2854BDWTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2854BDWTRG4 is usually 5 days.
3.What payment methods are accepted for UC2854BDWTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2854BDWTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2854BDWTRG4?
UC2854BDWTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2854BDWTRG4 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 UC2854BDWTRG4?
For technical support, including UC2854BDWTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2854BDWTRG4 requirements.
6.How does Aetrix verify that UC2854BDWTRG4 is sourced from the original manufacturer or authorized distributors?
All UC2854BDWTRG4 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 UC2854BDWTRG4 meets industry standards.
7.What is the process for return or replacement of UC2854BDWTRG4?
All UC2854BDWTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC2854BDWTRG4, 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 UC2854BDWTRG4 part is unused and in its original packaging.
Return procedure for UC2854BDWTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UC2854BDWTRG4 Tags
-
ICE2PCS01GXUMA1
Infineon Technologies
-
NCP1654BD133R2G
onsemi
-
MC33262DR2G
onsemi
-
ICE3PCS03GXUMA1
Infineon Technologies
-
NCP1631DR2G
onsemi
-
L4981BD013TR
STMicroelectronics
-
UCC28070DWR
Texas Instruments
-
UCC28070PWR
Texas Instruments
-
UC3854DWTR
Texas Instruments
-
L4981AD013TR
STMicroelectronics
-
UCC2817D
Texas Instruments
-
UC2854BDWTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
