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Texas Instruments UC2852DTR
- Part No.:
- UC2852DTR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UC2852DTR.pdf
- Description:
- IC PFC CTRLR CCM 200KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,828
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Product details
Overview
UC2852DTR from Texas Instruments is a high-current, zero-current-switched boost PWM controller IC for active power factor correction (PFC) in AC/DC front-end stages. It delivers >0.99 power factor, supports 50–500 W applications, features controlled on-time regulation, under-voltage lockout (16.3 V turn-on), and ±1.0 A peak OUT drive capability. Used in offline SMPS preregulators with sinusoidal input current shaping.
For engineers reviewing the UC2852DTR datasheet, UC2852DTR pinout, UC2852DTR application, or UC2852DTR equivalent, key selection criteria include its RAMP-based timing architecture, ISNS fault threshold of –450 mV, COMP clamp at 10.0 V, and SOIC-8 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The UC2852DTR implements a controlled on-time, zero-current-switched (ZCS) boost topology where switch off-time is determined by inductor discharge, and restart is triggered by ISNS crossing –10 mV. Its RAMP timer uses externally programmed charge current (via ISET resistor) and a capacitor to set on-time, enabling line- and load-adaptive frequency control between min/max limits.
It integrates a high-gain error amplifier (VFB = 5.0 V typ), a dedicated current-sense comparator with dual thresholds (–10 mV restart, –450 mV fault), and a robust 12 V-clamped gate driver (OUT) capable of ±1.0 A peak current. UVLO hysteresis is 5 V, and VCC clamp is 33 V, supporting reliable operation across noisy AC line environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Turn-On Threshold | 16.3 V - enables operation only after sufficient startup voltage is reached, preventing erratic behavior during brownout |
| ISNS Fault Threshold | –450 mV - triggers shutdown when sensed current exceeds safe MOSFET conduction limit |
| OUT Peak Current | ±1.0 A - directly drives power MOSFET gates without external buffers in most 500 W designs |
| COMP Clamp Voltage | 10.0 V - limits maximum on-time to prevent overvoltage stress on output bulk capacitor |
| RAMP Charge Current | 98 µA typ - sets timing slope with external ISET resistor, enabling precise on-time control |
| Power Factor | >0.99 - ensures compliance with IEC 61000-3-2 Class D harmonic limits for consumer electronics |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade AC/DC power supplies and embedded systems |
| Supply Current (Active) | 6.0 mA typ - enables low-loss control stage operation without auxiliary supply overhead |
Pinout & Package
UC2852DTR is housed in an 8-pin SOIC (D) package with standard JEDEC MS-012AC dimensions (5.3 mm × 6.2 mm × 1.75 mm), RoHS-compliant NIPDAU lead finish, and MSL Level-2 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal and power reference ground | Common return for all internal circuits; must be low-impedance connection to minimize noise coupling into ISNS and VFB |
| OUT (Pin 2) | High-current gate driver output | Drives external MOSFET gate with ±1.0 A peak; clamped to 12 V internally to protect FET gate oxide |
| ISET (Pin 3) | RAMP charge current programming & FAULT indicator | 5.0 V regulated reference output; sets RAMP charging current (I = 5 V / RISET); pulled to ~9 V during overcurrent fault |
| ISNS (Pin 4) | Zero- and over-current sense input | Accepts ±5 V dynamic range; detects inductor zero-crossing (–10 mV) and overcurrent (–450 mV) for ZCS timing and protection |
| RAMP (Pin 5) | Timing capacitor node | Integrates ISET-programmed current; compared against 4.3 V (PWM) and 1.02 V (max freq) thresholds to determine on-time and frequency limits |
| VCC (Pin 6) | Control supply input | Accepts 14.5–30 V; includes 5 V hysteresis UVLO and 33 V internal clamp; bypassing with ceramic + electrolytic required |
| VFB (Pin 7) | Error amplifier inverting input | Monitors output bulk voltage via resistive divider; 5.0 V typical reference sets 400 V output when Rtop/Rbot = 79:1 |
| COMP (Pin 8) | Error amplifier output / PWM comparator input | Drives RAMP ramp-up slope; clamped to 10.0 V to limit max on-time; used for soft-start via external PNP ramp circuit |
Key Features
| Feature | Design Value |
|---|---|
| Controlled On-Time Boost PWM | Enables adaptive switching frequency while maintaining stable output regulation across universal AC input (90–264 VAC) |
| Zero-Current Switching (ZCS) | Reduces EMI and MOSFET switching losses by ensuring turn-on only after inductor current reaches zero |
| Integrated High-Current Gate Driver | Eliminates need for external driver transistors in ≤500 W designs, reducing BOM count and layout complexity |
| Under-Voltage Lockout with Hysteresis | 5 V hysteresis prevents oscillation during AC line dips; 16.3 V turn-on ensures reliable startup from bulk capacitor |
| Dual-Threshold Current Sensing | Separate –10 mV (zero-cross) and –450 mV (fault) thresholds enable precise ZCS timing and robust overcurrent protection |
| Low Starting Current | <1 mA startup current allows direct bootstrapping from rectified AC line via high-value resistor, avoiding auxiliary winding |
Applications
| LED Driver Front-End | Industrial AC/DC Adapter |
|---|---|
|
Use Scenario: 200 W constant-current LED driver operating from 90–264 VAC input with EN61000-3-2 Class C compliance required. IC Role / Device Role / Timing Role: UC2852DTR acts as active PFC preregulator, generating 400 VDC bulk bus with sinusoidal input current and ZCS timing control. Use Value: Achieves >0.99 PF and <10% THD without large input chokes, enabling compact, fanless LED driver designs. |
Use Scenario: 350 W industrial programmable logic controller (PLC) power supply requiring stable 24 VDC output and universal AC input. IC Role / Device Role / Timing Role: UC2852DTR serves as the first-stage PFC controller, regulating bulk DC voltage and enforcing harmonic current limits per IEC 61000-3-2. Use Value: Enables single-stage PFC+LLC architecture with reduced component count and improved efficiency vs. passive PFC solutions. |
| Consumer Audio Amplifier PSU | Medical Equipment Power Module |
|
Use Scenario: High-fidelity Class-D audio amplifier with 120 W RMS output needing low-noise, low-EMI power conversion. IC Role / Device Role / Timing Role: UC2852DTR provides regulated 380 VDC bus using ZCS boost, minimizing high-frequency switching noise coupled into analog signal paths. Use Value: Reduces conducted EMI by >15 dB in 150 kHz–30 MHz band versus fixed-frequency PFC controllers, easing EMC certification. |
Use Scenario: UL/IEC 60601-1 compliant patient-monitoring device requiring continuous, low-risk power delivery from AC mains. IC Role / Device Role / Timing Role: UC2852DTR implements fail-safe PFC stage with dual-threshold current sensing and UVLO, feeding isolated DC/DC converter. Use Value: Built-in fault detection (ISNS fault, UVLO, max frequency clamp) supports safety-critical redundancy without external monitoring ICs. |
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 |
|---|---|---|---|
| UC3852DTR | Rated for 0°C to +70°C ambient; identical pinout, electrical specs, and block diagram but narrower temperature range | Suitable for commercial-grade equipment (e.g., office printers, consumer UPS) where extended temperature operation is not required | Select UC3852DTR only if industrial temperature range is unnecessary and cost optimization is prioritized |
| L6562ATDTR | Fixed-frequency average-current-mode PFC; requires different compensation network and lacks ZCS timing; 0.98 PF typical | Better suited for designs requiring predictable EMI spectrum and lower gate drive complexity, but higher inductor RMS current | Choose L6562ATDTR when deterministic switching frequency and simplified loop compensation outweigh ZCS efficiency benefits |
Compared with UC3852DTR and L6562ATDTR, the UC2852DTR uniquely combines industrial temperature rating, zero-current switching, and integrated high-current gate drive-enabling compact, thermally robust PFC stages in 50–500 W applications without external driver components.
Availability
UC2852DTR is available at Aetrix Electronics and suitable for industrial AC/DC adapters, LED driver front-ends, and medical power modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for UC2852DTR 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 IC design.
The UC2852DTR belongs to TI's legacy Unitrode PFC controller family, engineered specifically for cost-sensitive, high-efficiency active power factor correction in universal-input offline power supplies.
FAQ
What is the primary function of the UC2852DTR in a power supply design?
The UC2852DTR functions as an active power factor correction (PFC) controller in AC/DC power supplies. It shapes input current to follow the AC voltage waveform, achieving >0.99 power factor and meeting IEC 61000-3-2 harmonic standards. In the UC2852DTR, this is accomplished via zero-current-switched boost topology with controlled on-time PWM, making it ideal for 50–500 W industrial and medical power modules.
Does the UC2852DTR support zero-current switching, and how is it implemented?
Yes, the UC2852DTR implements zero-current switching (ZCS) using its ISNS pin to detect inductor current crossing zero. When ISNS voltage rises above –10 mV (typical restart threshold), the controller reactivates the switch cycle. This ZCS operation reduces switching losses and EMI. The UC2852DTR's dedicated ISNS comparator with separate fault threshold (–450 mV) ensures reliable timing and protection-core to its ZCS functionality.
What are the key differences between UC2852DTR and UC3852DTR?
The UC2852DTR and UC3852DTR share identical pinout, electrical specifications, and functional architecture, but differ in temperature rating: UC2852DTR operates from –40°C to +85°C (industrial), while UC3852DTR is rated for 0°C to +70°C (commercial). Both use SOIC-8 packaging and NIPDAU lead finish. For designs requiring extended thermal performance-such as enclosed industrial enclosures or outdoor-rated equipment-the UC2852DTR is the appropriate choice.
Can the UC2852DTR drive a power MOSFET directly without external gate drivers?
Yes, the UC2852DTR integrates a high-current gate driver with ±1.0 A peak output capability on its OUT pin, enabling direct drive of medium-power MOSFETs (e.g., IRF830, STP8NK80Z) in ≤500 W PFC stages. Its internal 12 V clamp protects the MOSFET gate, and low OUT saturation voltages (0.5–1.7 V high-side, 0.5–1.6 V low-side) minimize conduction loss. External damping may still be needed for long PCB traces to suppress ringing.
What is the role of the ISET pin in UC2852DTR, and how is it configured?
The ISET pin on the UC2852DTR serves three roles: (1) programming RAMP charge current (IRAMP ≈ 5 V / RISET), (2) providing a 5.0 V ±10% reference for external circuitry, and (3) signaling overcurrent faults by pulling to ~9 V. A resistor from ISET to GND (e.g., 50 kΩ for 100 µA) sets timing slope; loading must be minimal to preserve accuracy. This triple-function design simplifies external component count in UC2852DTR-based PFC layouts.
UC2852DTR 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:
- Continuous Conduction (CCM)
- Frequency - Switching:
- 200kHz
- Current - Startup:
- 400 µA
- Voltage - Supply:
- 13V ~ 30V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UC2852DTR FAQ
1.How can I place an order for UC2852DTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2852DTR 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 UC2852DTR reliable?
The price and inventory of UC2852DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2852DTR is usually 5 days.
3.What payment methods are accepted for UC2852DTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2852DTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2852DTR?
UC2852DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2852DTR 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 UC2852DTR?
For technical support, including UC2852DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2852DTR requirements.
6.How does Aetrix verify that UC2852DTR is sourced from the original manufacturer or authorized distributors?
All UC2852DTR 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 UC2852DTR meets industry standards.
7.What is the process for return or replacement of UC2852DTR?
All UC2852DTR units undergo pre-shipment inspection (PSI). If there is an issue with UC2852DTR, 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 UC2852DTR part is unused and in its original packaging.
Return procedure for UC2852DTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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