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Texas Instruments UC3853DTR
- Part No.:
- UC3853DTR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UC3853DTR.pdf
- Description:
- IC PFC CTR AVER CURR 94KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,808
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Product details
Overview
UC3853DTR from Texas Instruments is an 8-pin active power factor correction (PFC) controller IC designed for universal-input AC/DC front-end preregulators. It implements average current mode control with RMS line voltage compensation, features a precision multiplier/squarer/divider, dual error amplifiers, and a 75kHz synchronizable oscillator. It operates from 0°C to +70°C and supports input ranges up to 265VAC in compact SOIC-8 packaging.
For engineers reviewing the UC3853DTR datasheet, UC3853DTR pinout, UC3853DTR application, or UC3853DTR equivalent, key selection considerations include its RMS-compensated voltage loop gain stability across 85–265VAC, clamped gate driver capable of driving external MOSFETs up to 40V VCC, and integrated overvoltage protection with 90mV threshold referenced to FB.
Technical Context
The UC3853DTR employs average current mode PWM control using a transconductance voltage amplifier (VCOMP) and a differential current amplifier (ICOMP), enabling precise shaping of input current to match rectified line voltage. Its internal multiplier accepts IAC current proportional to RMS line voltage and generates a reference for the current loop, ensuring constant loop gain independent of input voltage variation.
It integrates a self-biasing clamped gate driver (OUT) with 15V clamp and 50mA sink capability, undervoltage lockout with 13V turn-on threshold and 1.8V hysteresis, and an overvoltage protection comparator triggered when FB exceeds nominal by 5%. The oscillator supports external synchronization via FB pin with 2V falling-edge clock pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temperature | 0°C to +70°C - defines ambient range for commercial-grade PFC operation without derating |
| Oscillator Frequency | 75 kHz typical, 56–94 kHz over line/load/temp - sets base switching frequency for boost PFC stage design |
| Voltage Loop Transconductance | 450 µmho typical at 0–70°C - determines small-signal gain for output voltage regulation loop |
| Current Loop Sink Current | 1 mA at VIMO = 100 mV - enables direct interfacing with current-sense resistor networks |
| Gate Driver Output Clamp | 15 V maximum - protects external MOSFET gate oxide when VCC reaches 40 V |
| Undervoltage Lockout Threshold | 13 V turn-on with 1.8 V hysteresis - ensures stable startup and brownout recovery in offline supplies |
| OVP Threshold | 90 mV above EA input reference - provides fast shutdown if output voltage exceeds safe margin |
Pinout & Package
UC3853DTR is housed in an 8-lead SOIC (D) package with standard JEDEC MS-012AC dimensions (5.3mm × 6.2mm × 1.75mm), 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 | Accepts feedback divider signal; trips shutdown if >3.15V; accepts 2V sync pulse on falling edge |
| GND | Power and signal reference ground | Reference for all voltages; bypass capacitor must connect here for stable operation |
| IAC | AC waveform sensing input | Low-impedance node accepting current proportional to RMS line voltage for multiplier input |
| IMO | Multiplier output / current sense inverting input | Summing node for multiplier current and sensed inductor current; requires 3.9kΩ impedance to GND |
| OUT | High-current gate driver output | Drives external MOSFET gate; clamped to 15V; requires ≥5Ω series resistor to limit overshoot |
| ICOMP | Current loop error amplifier output | Class-A op-amp output sourcing up to 150µA; used to compensate current loop with IMO |
| VCC | Supply input and RMS voltage feed | Supplies chip and feeds squarer circuit; enables constant-loop-gain compensation when tied to DC proportional to line RMS |
| VCOMP | Voltage loop error amplifier output | Transconductance amplifier output; compensates voltage loop to GND (not FB) to preserve OVP function |
Key Features
| Feature | Design Value |
|---|---|
| RMS line voltage compensation | Maintains constant voltage loop gain across 85–265VAC input, reducing THD without adaptive tuning |
| Precision multiplier/squarer/divider | Enables true average current mode control by generating line-frequency current reference proportional to VRMS² |
| Clamped 15V gate driver | Allows direct drive of logic-level MOSFETs without external Zener clamp, even with 40V VCC supply |
| Internal 75kHz oscillator with sync input | Reduces EMI by enabling phase alignment with downstream converters via FB pin |
| Integrated overvoltage protection | Shuts down OUT within microseconds if output exceeds 5% of regulated value, protecting downstream rails |
Applications
| Server Power Supplies | Industrial AC/DC Adapters |
|---|---|
|
Use Scenario: 1U rack-mounted server PSU requiring >98% efficiency and EN61000-3-2 Class A compliance. IC Role / Device Role / Timing Role: Primary PFC controller implementing continuous conduction mode (CCM) boost preregulator with RMS-compensated current loop. Use Value: Enables single-stage PFC design meeting harmonic limits across global mains voltages without firmware or digital compensation. |
Use Scenario: DIN-rail mounted 240W industrial adapter powering PLC I/O modules in factory environments. IC Role / Device Role / Timing Role: Fixed-frequency average current mode PFC controller regulating 400V DC bus with wide input voltage tolerance. Use Value: Delivers stable 400V output with <5% THD at 230VAC full load, leveraging internal oscillator synchronization to reduce system-level EMI. |
| LED Streetlight Drivers | Medical AC/DC Power Modules |
|
Use Scenario: Outdoor LED streetlight with universal input (90–305VAC) and high reliability requirement under thermal stress. IC Role / Device Role / Timing Role: Active PFC controller operating in CCM to maintain power factor >0.95 while supporting 75kHz switching for compact magnetics. Use Value: Internal UVLO hysteresis and OVP ensure fail-safe shutdown during brownouts or open-feedback faults, meeting IEC61347-2-13 requirements. |
Use Scenario: 150W medical-grade AC/DC module requiring 2×MOPP isolation and low leakage current. IC Role / Device Role / Timing Role: Input-stage PFC controller enabling high-efficiency front-end before isolated DC/DC conversion. Use Value: Low startup current (500µA max) and self-biasing gate driver reduce no-load losses, supporting Energy Star Tier 2 standby compliance. |
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 |
|---|---|---|---|
| UC2853DTR | Rated for –25°C to +85°C; higher transconductance (640 µmho) at full temp range; identical pinout and architecture | Preferred for extended temperature industrial or telecom applications where ambient exceeds 70°C | Select UC2853DTR when operating above 70°C or requiring tighter voltage loop gain stability over temperature |
| L6562ATR | Fixed 65kHz oscillator; no external sync input; uses voltage-mode control with feedforward; different multiplier topology | Suitable for cost-sensitive consumer adapters but lacks RMS compensation and sync capability | Choose L6562ATR only for non-synchronized, lower-performance PFC stages where THD <10% is acceptable |
Compared with UC2853DTR and L6562ATR, the UC3853DTR offers optimal trade-off between commercial-temperature operation, RMS-based loop stability, and synchronization flexibility-making it ideal for mid-tier industrial and lighting PFC designs where 70°C ambient ceiling is sufficient and EMI coordination matters.
Availability
UC3853DTR is available at Aetrix Electronics and suitable for server power supplies, industrial AC/DC adapters, LED streetlight drivers, and medical AC/DC power modules requiring stable component supply and long-term manufacturability.
Supply support for UC3853DTR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The UC3853DTR belongs to TI's legacy UCx853 family of analog PFC controllers, engineered specifically for cost-effective, high-reliability active power factor correction in universal-input offline power supplies.
FAQ
What is the operating temperature range specified for the UC3853DTR?
The UC3853DTR is rated for operation from 0°C to +70°C, consistent with commercial-grade power supply applications. This range is explicitly defined in TI's packaging addendum and electrical characteristics tables, distinguishing it from the wider-temperature UC2853DTR (–25°C to +85°C) and UC1853 (–55°C to +125°C). Thermal derating is not required within this envelope.
Does the UC3853DTR support external synchronization of its oscillator?
Yes, the UC3853DTR supports external synchronization via the FB pin, which doubles as a sync input. A 2V falling-edge clock pulse with 100V/µs slew rate can be injected through a capacitor to align the internal 75kHz oscillator with downstream converters. This capability is documented in the oscillator section and pin description, and is critical for EMI reduction in multi-stage power systems.
How does the UC3853DTR implement RMS line voltage compensation?
The UC3853DTR implements RMS line voltage compensation by routing a DC voltage proportional to input RMS voltage to the VCC pin, which feeds the internal squarer circuit. This reduces voltage loop gain by √VCC, maintaining constant loop gain across 85–265VAC input. The technique is confirmed in the device description and oscillator note 2, directly enabling low THD without software or external computation.
What is the purpose of the IMO pin on the UC3853DTR?
The IMO pin on the UC3853DTR serves as both the multiplier output and the inverting input of the current loop error amplifier. It functions as a summing node where the multiplier's current reference and the sensed inductor current converge, enabling differential current error amplification that rejects ground noise. The datasheet specifies a recommended 3.9kΩ impedance to GND to minimize bias-induced offset.
Can the UC3853DTR drive a MOSFET gate directly without external components?
The UC3853DTR includes a clamped gate driver (OUT) with 15V internal clamp and 50mA sink capability, allowing direct drive of many logic-level MOSFETs. However, TI recommends a minimum 5Ω series gate resistor to suppress clamp overshoot and a Schottky diode (e.g., 1N5818) from OUT to GND to prevent parasitic conduction. These requirements are specified in the OUT pin description and typical application notes.
UC3853DTR 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UC3853DTR FAQ
1.How can I place an order for UC3853DTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3853DTR 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 UC3853DTR reliable?
The price and inventory of UC3853DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3853DTR is usually 5 days.
3.What payment methods are accepted for UC3853DTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3853DTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3853DTR?
UC3853DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3853DTR 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 UC3853DTR?
For technical support, including UC3853DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3853DTR requirements.
6.How does Aetrix verify that UC3853DTR is sourced from the original manufacturer or authorized distributors?
All UC3853DTR 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 UC3853DTR meets industry standards.
7.What is the process for return or replacement of UC3853DTR?
All UC3853DTR units undergo pre-shipment inspection (PSI). If there is an issue with UC3853DTR, 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 UC3853DTR part is unused and in its original packaging.
Return procedure for UC3853DTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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