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Texas Instruments UC2853DTR
- Part No.:
- UC2853DTR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UC2853DTR.pdf
- Description:
- IC PFC CTR AVER CURR 94KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,356
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Product details
Overview
UC2853DTR from Texas Instruments is an 8-pin active power factor correction (PFC) controller IC designed for average current mode control in offline AC-DC preregulators. It features RMS line voltage compensation, a precision multiplier/squarer/divider, internal 75 kHz synchronizable oscillator, and a clamped high-current gate driver. It operates across –25°C to +85°C and targets universal-input (85–265 VAC) 100W+ PFC stages.
For engineers reviewing the UC2853DTR datasheet, UC2853DTR pinout, UC2853DTR application, or UC2853DTR equivalent, key selection considerations include its temperature grade (–25°C to +85°C), SOIC-8 packaging, RMS-compensated multiplier architecture, OVP comparator threshold (90–150 mV above EA input), and compatibility with external MOSFET gate drive in boost PFC topologies.
Technical Context
The UC2853DTR implements average current mode PWM control using a transconductance voltage error amplifier (300–575 µmho gain) and a current loop error amplifier with ±1 mA sink/source capability. Its multiplier section delivers precise IAC-dependent current output (–170 to –230 µA typical) scaled by VCOMP and VCC, enabling constant loop gain across input voltage variations.
It integrates a self-biasing gate driver with 15 V clamp, undervoltage lockout (11.5–13 V turn-on, 1.5–2.1 V hysteresis), and synchronization capability via FB pin (2 V falling-edge clock). The device supports zero-duty-cycle operation via VCOMP < 1.5 V and features dedicated IMO summing node for noise-immune current sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 67.5–82.5 kHz typ at 25°C; enables stable 75 kHz boost switching with ±15% tolerance over line/load/temp |
| Voltage Loop Gain | 50–60 dB open-loop; ensures tight output voltage regulation (±1.5% nominal FB = 3 V) in PFC output stage |
| Current Sense Input (IMO) | –0.3 V min; allows differential current error amplifier configuration to reject ground noise in high-noise boost converters |
| Gate Driver Output | 15 V clamp, 0.125 A continuous / 0.5 A peak; drives standard N-channel MOSFETs without external level-shifting |
| Operating Temperature | –25°C to +85°C; qualified for industrial-grade AC-DC power supplies, not automotive or extended military |
| Supply Voltage Range | 12 V to 40 V on VCC; supports direct connection to rectified bus or auxiliary supply, enabling >85–265 VAC universal input |
| OVP Threshold | 90–150 mV above EA input; provides fast shutdown when PFC output exceeds safe margin, protecting downstream DC-DC stages |
Pinout & Package
UC2853DTR is housed in an 8-lead SOIC (D) package with standard JEDEC MS-012AC dimensions (4.9 mm × 3.9 mm × 1.75 mm), RoHS-compliant NiPdAu lead finish, and MSL Level-2 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage amplifier inverting input / OVP comparator input / sync input | Regulates PFC output to 3 V; trips shutdown if >3.15 V; accepts 2 V falling-edge sync pulses to align with downstream converters |
| GND | Signal and power reference | Reference for all voltages; requires low-inductance 0.1 µF ceramic bypass capacitor placed adjacent to pin |
| IAC | AC waveform input to multiplier | Accepts current proportional to rectified line voltage (e.g., 500 µA at max line); sets input current shape for unity PF |
| IMO | Multiplier output / current sense inverting input | Summing node for current error amplifier; must stay ≥ –0.5 V to avoid protection diode conduction |
| OUT | Gate driver output | Drives external MOSFET gate; 15 V clamp prevents VGS overstress; requires ≥5 Ω series resistor to limit overshoot |
| ICOMP | Current loop error amplifier output | Class-A op-amp output (±150 µA); compensates current loop via impedance to IMO; supports zero duty cycle below 1.5 V |
| VCC | Supply input / RMS voltage feed | Powers IC and feeds squarer circuit; DC voltage here scales loop gain inversely with VCC² for RMS compensation |
| VCOMP | Voltage loop error amplifier output | Transconductance output (300–575 µmho); connects to GND for compensation; forces zero multiplier output below 1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| RMS line voltage compensation | Maintains constant voltage loop gain across 85–265 VAC input range, reducing THD and improving PF stability |
| Average current mode control | Enables accurate input current shaping and inherent overcurrent protection without slope compensation |
| Internal 75 kHz oscillator with sync input | Reduces EMI by enabling phase alignment with downstream DC-DC converters via FB pin |
| Clamped 15 V gate driver | Allows direct drive of standard logic-level MOSFETs without external Zener clamping or level shifters |
| Integrated overvoltage protection comparator | Shuts down OUT within microseconds when PFC output exceeds safe threshold, preventing downstream damage |
Applications
| Industrial AC-DC Power Supplies | Server & Telecom Rectifiers |
|---|---|
|
Use Scenario: 300–1000 W front-end rectification in DIN-rail mounted industrial PSUs requiring >0.95 PF across global mains. IC Role / Device Role / Timing Role: Primary PFC controller implementing average current mode boost topology with RMS compensation. Use Value: Enables compliance with IEC 61000-3-2 Class A/C limits without external analog multipliers or DSP intervention. |
Use Scenario: High-density 48 V intermediate bus generation in telecom shelf systems with strict efficiency and thermal constraints. IC Role / Device Role / Timing Role: Active PFC controller synchronized to downstream isolated DC-DC modules via FB pin. Use Value: Reduces system-level EMI through clock alignment and maintains >95% efficiency at 50% load across temperature. |
| LED Driver Front-Ends | Medical Equipment Power Modules |
|
Use Scenario: Constant-power LED drivers for street lighting operating from 100–277 VAC with dimming interface requirements. IC Role / Device Role / Timing Role: Pre-regulator ensuring stable DC bus for downstream buck/boost LED current controllers. Use Value: Delivers <3% THD at full load and supports 0–10 V analog dimming without compromising PF or regulation. |
Use Scenario: Safety-critical AC-DC conversion in diagnostic imaging equipment requiring low leakage, high reliability, and long-term calibration stability. IC Role / Device Role / Timing Role: Precision PFC controller with low-offset amplifiers and stable 3 V reference for regulated output bus. Use Value: Achieves <±1% output voltage drift over 10-year life due to low-drift internal reference and compensated loop design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3853DTR | Rated for 0°C to +70°C ambient; identical pinout, oscillator, and multiplier architecture but narrower temp range | Suitable for commercial-grade consumer electronics where industrial temp range is unnecessary | Select UC3853DTR only if ambient operating temperature stays within 0–70°C and cost optimization is prioritized |
| UCC28070DR | Two-phase interleaved CCM PFC controller; includes digital ramp compensation, soft-start, and enhanced protection features | Targets higher-power (>500 W), lower-THD (<1%) applications requiring reduced EMI and improved light-load efficiency | Choose UCC28070DR when upgrading from single-phase to interleaved PFC or adding programmable soft-start and fault logging |
Compared with UC3853DTR, the UC2853DTR offers broader industrial temperature support (–25°C to +85°C) while retaining identical functional architecture; versus UCC28070DR, it provides simpler, lower-cost single-phase control without interleaving or digital features-ideal for cost-sensitive 100–300 W designs.
Availability
UC2853DTR is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, server rectifiers, LED driver front-ends, and medical equipment power modules requiring stable component supply and long-term manufacturability.
Supply support for UC2853DTR 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, embedded processing, and power management solutions with emphasis on reliability, precision, and system-level integration.
The UC2853DTR belongs to TI's legacy UCx853 PFC controller family, engineered specifically for cost-effective, high-performance active power factor correction in universal-input offline switch-mode power supplies.
FAQ
What is the operating temperature range specified for the UC2853DTR?
The UC2853DTR is rated for operation from –25°C to +85°C ambient temperature. This industrial-grade specification distinguishes it from the UC3853DTR (0°C to +70°C) and UC1853 (–55°C to +125°C). The datasheet confirms this range applies to electrical characteristics testing and long-term reliability validation, making UC2853DTR suitable for enclosed industrial power supplies where internal board temperatures may exceed commercial limits.
Does the UC2853DTR support synchronization with downstream converters?
Yes, the UC2853DTR supports synchronization via its FB pin, which doubles as a sync input. A 2 V falling-edge clock signal with ≥100 V/µs slew rate can be injected through a capacitor to align the internal 75 kHz oscillator with downstream DC-DC converters. This feature reduces beat frequencies and system-level EMI-critical in multi-rail power architectures like telecom rectifiers and server PSUs where UC2853DTR is commonly deployed.
What is the purpose of the VCC pin beyond supplying power to the UC2853DTR?
Beyond powering the UC2853DTR, the VCC pin feeds the internal squarer circuit used for RMS line voltage compensation. When connected to a DC voltage proportional to the AC input RMS value, the voltage loop gain is scaled by 1/VCC²-maintaining constant loop bandwidth across 85–265 VAC input. This direct VCC-to-squarer linkage is essential to UC2853DTR's ability to sustain high power factor without external multipliers or microcontroller intervention.
How does the UC2853DTR implement overvoltage protection?
The UC2853DTR implements overvoltage protection using an internal comparator that monitors the FB pin voltage relative to the voltage amplifier's inverting input. When FB exceeds the nominal 3 V regulation point by 5% (i.e., >3.15 V), the comparator triggers immediate shutdown of the OUT driver. Recovery occurs only after the output drops 5% below trip level-preventing oscillatory behavior. This OVP function is integral to UC2853DTR's safety architecture and requires no external components.
Can the UC2853DTR drive a MOSFET directly without external gate resistors or clamps?
No-the UC2853DTR includes a 15 V clamp on its OUT pin but still requires an external series gate resistor (≥5 Ω recommended) to suppress voltage overshoot caused by parasitic inductance during fast switching. While the clamp protects against VGS overstress up to 40 V VCC, omitting the resistor risks ringing, shoot-through, or false triggering in high-dV/dt environments. The UC2853DTR datasheet explicitly specifies this requirement in the PIN DESCRIPTIONS section for reliable MOSFET gate drive.
UC2853DTR 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
UC2853DTR FAQ
1.How can I place an order for UC2853DTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2853DTR 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 UC2853DTR reliable?
The price and inventory of UC2853DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2853DTR is usually 5 days.
3.What payment methods are accepted for UC2853DTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2853DTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2853DTR?
UC2853DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2853DTR 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 UC2853DTR?
For technical support, including UC2853DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2853DTR requirements.
6.How does Aetrix verify that UC2853DTR is sourced from the original manufacturer or authorized distributors?
All UC2853DTR 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 UC2853DTR meets industry standards.
7.What is the process for return or replacement of UC2853DTR?
All UC2853DTR units undergo pre-shipment inspection (PSI). If there is an issue with UC2853DTR, 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 UC2853DTR part is unused and in its original packaging.
Return procedure for UC2853DTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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