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Texas Instruments UC2853ADTR
- Part No.:
- UC2853ADTR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UC2853ADTR.pdf
- Description:
- IC PFC CTR AVER CURR 94KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,358
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Product details
Overview
UC2853ADTR from Texas Instruments is an 8-pin active power factor correction (PFC) controller IC designed for average current mode control in universal-input AC/DC front-end stages. It integrates a precision multiplier/squarer/divider, dual error amplifiers (voltage and current loops), internal 75 kHz oscillator with synchronization capability, RMS line voltage compensation, and a clamped high-current gate driver. It operates across –25°C to +85°C and targets 85–265 VAC input systems such as industrial SMPS and LED drivers.
For engineers reviewing the UC2853ADTR datasheet, UC2853ADTR pinout, UC2853ADTR application, or UC2853ADTR equivalent, key selection considerations include its RMS-compensated multiplier architecture, 75 kHz synchronizable oscillator, OVP comparator threshold at 90–150 mV above EA input, clamped gate driver output (max 17.5 V), and SOIC-8 thermal profile with MSL Level-2-260°C-1 year rating.
Technical Context
The UC2853ADTR implements average current mode PWM control using a transconductance voltage amplifier (300–575 µmho gain) and a differential current error amplifier with ±1 mA sink/source capability. Its multiplier section delivers –236 µA to –168 µA output current under power-limited conditions and features a gain constant of –1.05 to –0.75 V⁻¹.
Oscillator frequency is factory trimmed to 75 kHz (±12.5%) with 56–94 kHz variation over line/load/temperature; external synchronization accepts 2 V falling-edge pulses up to 100 kHz. The overvoltage protection comparator triggers at 90–150 mV above FB voltage with 80 mV hysteresis, independent of loop dynamics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 75 kHz nominal (56–94 kHz range); enables fixed-frequency PFC stage timing with external sync capability. |
| Voltage Loop Gain | 50–60 dB open-loop gain; supports stable regulation of 3 V FB reference with RMS line compensation. |
| Current Loop Transconductance | 300–575 µmho (0–70°C); sets loop bandwidth and stability margin for input current waveform shaping. |
| Gate Driver Output Clamp | 15 V clamp on OUT pin; protects MOSFET gate during VCC up to 40 V without external Zener. |
| OVP Threshold | 90–150 mV above FB voltage; provides fast shutdown if output exceeds 3.15 V (5% over nominal). |
| Supply Voltage Range | 12–40 V on VCC; supports direct connection to rectified bulk rail in universal-input designs. |
| Operating Temperature | –25°C to +85°C; qualified for industrial-grade ambient operation without derating. |
Pinout & Package
UC2853ADTR is housed in an 8-lead SOIC (D) package with standard JEDEC MS-012AC footprint, 1.27 mm pitch, and MSL Level-2 moisture sensitivity rating. Pin 1 orientation follows Q1 quadrant assignment per tape-and-reel packaging standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage amplifier inverting input / OVP comparator input / sync input | Regulates output to 3 V; trips OVP at >3.15 V; accepts 2 V sync pulse via capacitor-coupled falling edge. |
| GND | Signal and power ground reference | All voltages referenced here; VCC bypass capacitor must connect directly to minimize noise coupling. |
| IAC | AC line voltage waveform input | Low-impedance node (nominally 2 V) accepting current proportional to rectified line voltage for RMS sensing. |
| IMO | Multiplier output / current sense inverting input | Summing node for multiplier current and sensed inductor current; requires 3.9 kΩ impedance to GND to limit offset. |
| OUT | High-current gate driver output | Drives external MOSFET with 50 mA sink capability; clamped at 15 V to prevent gate overvoltage. |
| ICOMP | Current loop error amplifier output | Class-A op-amp output (±150 mA capability); connects to IMO for current loop compensation. |
| VCC | Supply input / RMS voltage feed | Powers IC and feeds squarer circuit; DC voltage here scales loop gain inversely with √VCC for RMS compensation. |
| VCOMP | Voltage loop error amplifier output | Transconductance amplifier output (300–575 µmho); connects to GND for compensation-never to FB. |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Enables low THD input current (<5%) across 85–265 VAC input range without line-voltage feedforward. |
| RMS line voltage compensation | Maintains constant voltage loop gain by scaling multiplier gain with √VCC, eliminating input-voltage-dependent bandwidth shift. |
| Internal 75 kHz oscillator with sync input | Reduces external timing components; allows interleaved or downstream converter synchronization to avoid beat frequencies. |
| Clamped gate driver (15 V) | Permits direct drive of 12 V-rated MOSFETs without external clamp diodes, simplifying gate-drive network. |
| Overvoltage protection comparator | Dedicated comparator referenced to FB pin with 80 mV hysteresis ensures reliable output overvoltage shutdown. |
Applications
| Industrial AC/DC Power Supplies | LED Driver Front-End Stages |
|---|---|
|
Use Scenario: 300 W industrial SMPS with universal AC input (85–265 VAC) and regulated 400 V DC bus. IC Role / Device Role / Timing Role: Primary PFC controller implementing average current mode control with RMS line compensation and 75 kHz switching. Use Value: Achieves >0.99 PF and <5% THD across full input range while maintaining stable loop gain without manual gain adjustment. |
Use Scenario: High-bay LED luminaire requiring Class C conducted EMI compliance and 90–265 VAC operation. IC Role / Device Role / Timing Role: Standalone PFC pre-regulator driving boost converter stage; synchronized to downstream LED driver clock. Use Value: Enables single-stage PFC + LED buck-boost design with reduced component count and elimination of line-voltage sensing resistors. |
| Server PSU Auxiliary PFC | Medical Equipment Power Modules |
|
Use Scenario: 1U server PSU auxiliary rail (12 V/20 A) with active PFC for efficiency certification (80 PLUS Titanium). IC Role / Device Role / Timing Role: Dedicated PFC controller managing boost stage before main LLC resonant converter; uses sync input to align switching edges. Use Value: Reduces EMI filter size through synchronized switching and maintains tight output regulation under dynamic load steps. |
Use Scenario: UL/IEC 60601-1 compliant medical power module requiring low leakage current and high reliability. IC Role / Device Role / Timing Role: Isolated PFC controller in split-rail topology with reinforced insulation barrier between IAC and GND domains. Use Value: Supports creepage/clearance requirements via SOIC-8 package and internal clamping, reducing need for external isolation components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active power factor correction applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3853DTR | Rated for 0°C to +70°C ambient; lower temperature grade than UC2853ADTR's –25°C to +85°C range. | Suitable for commercial-grade equipment with limited ambient range; not rated for extended industrial environments. | Select UC3853DTR only when operating temperature stays within 0–70°C and cost optimization is prioritized over thermal margin. |
| UCC28511D | Enhanced version with improved startup current (250 µA vs. 500 µA), higher oscillator accuracy (±3%), and integrated soft-start. | Supports tighter THD specs and smoother turn-on in high-reliability systems; requires minor compensation redesign. | Choose UCC28511D when upgrading legacy UC2853ADTR designs for improved light-load efficiency and reduced inrush stress. |
Compared with UC3853DTR and UCC28511D, the UC2853ADTR offers optimal balance of industrial temperature range, proven RMS compensation architecture, and minimal external component count-making it ideal for cost-sensitive yet thermally demanding PFC implementations where long-term supply continuity is critical.
Availability
UC2853ADTR is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, LED driver front-end stages, and medical equipment power modules requiring stable component supply and long lifecycle support.
Supply support for UC2853ADTR 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 and embedded processing solutions, with over 90 years of innovation in power management ICs and industrial control circuits.
The UC2853ADTR belongs to TI's legacy UCx853 PFC controller family, engineered specifically for cost-effective, high-performance active power factor correction in universal-input switch-mode power supplies.
FAQ
What is the operating temperature range specified for the UC2853ADTR?
The UC2853ADTR is specified for operation from –25°C to +85°C. This industrial-grade temperature range is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, distinguishing it from the UC3853 (0°C to +70°C) and UC1853 (–55°C to +125°C). The SOIC-8 package supports this range with MSL Level-2-260°C-1 year reflow compatibility.
Does the UC2853ADTR support external synchronization of its oscillator?
Yes, the UC2853ADTR supports external synchronization via the FB pin. A 2 V falling-edge clock pulse with 100 V/µs slew rate can be injected through a capacitor to synchronize the internal 75 kHz oscillator to downstream converters. This capability is explicitly documented in the Oscillator Section of the Electrical Characteristics table and the FB pin description, enabling noise reduction in multi-converter systems.
What is the purpose of the VCC pin beyond supplying power to the UC2853ADTR?
Beyond powering the UC2853ADTR, the VCC pin feeds the internal squarer circuit to enable RMS line voltage compensation. When connected to a DC voltage proportional to the AC input RMS voltage, the voltage loop gain is scaled by 1/√VCC-maintaining constant loop gain across 85–265 VAC input. This dual function is detailed in the VCC pin description and the "RMS Line Voltage Compensation" feature bullet.
How does the UC2853ADTR implement overvoltage protection?
The UC2853ADTR implements overvoltage protection using a dedicated comparator referenced to the FB pin. It triggers when FB voltage exceeds nominal by 90–150 mV (i.e., >3.15 V), shutting down the OUT driver until the output drops by 5% hysteresis (80 mV). This function is independent of the voltage error amplifier and is described in both the OVP Comparator Section of Electrical Characteristics and the FB pin functional description.
Can the UC2853ADTR drive a MOSFET gate directly without external components?
The UC2853ADTR can drive a MOSFET gate directly using its clamped OUT pin, which limits voltage to ~15 V-safe for most 12 V-rated MOSFETs. However, a series gate resistor ≥5 Ω is required to suppress clamp overshoot, and a Schottky diode (e.g., 1N5818) from OUT to GND is recommended to prevent parasitic conduction. These requirements are specified in the OUT pin description and Applications section of the datasheet.
UC2853ADTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Mode:
- Average Current
- Frequency - Switching:
- 56kHz ~ 94kHz
- Current - Startup:
- 250 µA
- Voltage - Supply:
- 12V ~ 40V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UC2853ADTR FAQ
1.How can I place an order for UC2853ADTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2853ADTR 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 UC2853ADTR reliable?
The price and inventory of UC2853ADTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2853ADTR is usually 5 days.
3.What payment methods are accepted for UC2853ADTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2853ADTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2853ADTR?
UC2853ADTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2853ADTR 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 UC2853ADTR?
For technical support, including UC2853ADTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2853ADTR requirements.
6.How does Aetrix verify that UC2853ADTR is sourced from the original manufacturer or authorized distributors?
All UC2853ADTR 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 UC2853ADTR meets industry standards.
7.What is the process for return or replacement of UC2853ADTR?
All UC2853ADTR units undergo pre-shipment inspection (PSI). If there is an issue with UC2853ADTR, 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 UC2853ADTR part is unused and in its original packaging.
Return procedure for UC2853ADTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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