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Texas Instruments UC2852NG4
- Part No.:
- UC2852NG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
UC2852NG4.pdf
- Description:
- IC PFC CONTROLLER CCM 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
UC2852NG4 from Texas Instruments is a high-power-factor preregulator controller IC designed for zero-current-switched boost PFC stages in AC-DC front-ends. It delivers >0.99 power factor, supports 50–500 W systems, features controlled on-time PWM, zero-current sensing, and under-voltage lockout (UVLO) with 16.3 V turn-on threshold. Used in offline SMPS input stages to meet IEC 61000-3-2 harmonic limits.
For engineers reviewing the UC2852NG4 datasheet, UC2852NG4 pinout, UC2852NG4 application, or UC2852NG4 equivalent, key selection criteria include its 8-pin PDIP package, -40°C to +85°C operating range, 1.0 A peak OUT drive capability, RAMP discharge current up to 50 mA, and ISNS fault threshold of –450 mV - all critical for robust PFC design validation and layout planning.
Technical Context
The UC2852NG4 implements a controlled on-time, zero-current-switched boost topology where switch conduction time is modulated by the COMP voltage and the RAMP capacitor, while off-time is determined by inductor reset. Its timer section uses ISET-programmed charging current (≈5 V / RISET) and internal thresholds (e.g., 4.3 V PWM comparator, 1.02 V max-frequency clamp) to regulate switching frequency between load- and line-dependent bounds.
Protection is integrated at the analog level: ISNS monitors current via a sense resistor with dual comparators (–10 mV restart, –450 mV fault), OUT provides ±1.0 A peak gate drive with clamping at 12 V, and UVLO ensures operation only above 16.3 V with 5 V hysteresis. The error amplifier (VFB = 5.0 V typ, ±0.3 V tolerance) closes the bulk voltage loop with COMP as its output and PWM input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ISET Voltage | 5.0 V typical - sets RAMP charge current and serves as stable reference for external timing components |
| RAMP Discharge Current | 28 mA typical - determines off-time duration and enables zero-current detection during inductor demagnetization |
| ISNS Fault Threshold | –450 mV - triggers shutdown when sensed current exceeds safe MOSFET conduction limit |
| VCC Turn-On Threshold | 16.3 V - ensures reliable startup after bulk capacitor charges above brown-out level |
| OUT Peak Current | ±1.0 A - directly drives power MOSFET gates without external buffers in ≤100 W designs |
| Power Factor | >0.99 - meets Class D IEC 61000-3-2 harmonic current limits for consumer/industrial equipment |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade AC-DC power supplies with ambient thermal stress |
Pinout & Package
UC2852NG4 is housed in an 8-pin plastic dual in-line package (PDIP), with lead finish NIPDAU and RoHS-compliant construction. Pin 1 is GND; pin orientation follows standard DIP quadrant Q1 per tape-and-reel packaging specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal and power ground reference | Common return path 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 | Delivers ±1.0 A peak to directly drive MOSFET gates; clamped at 12 V to protect external FETs during overvoltage events |
| VFB (Pin 3) | Inverting input of error amplifier | Monitors bulk DC output voltage via resistive divider; 5.0 V nominal setpoint defines regulated 400 V output in typical 100 W PFC stage |
| ISET (Pin 4) | RAMP current programming & FAULT indicator | Sets RAMP charging current (≈5 V / RISET); pulled to ~9 V during overcurrent fault to signal external protection circuitry |
| RAMP (Pin 5) | Timing capacitor node | Integrates ISET current to generate sawtooth waveform; slope and threshold (4.3 V) define on-time in controlled on-time PWM |
| ISNS (Pin 6) | Current sense input | Accepts ±5 V differential signal from sense resistor; dual comparators enable zero-current restart (–10 mV) and overcurrent shutdown (–450 mV) |
| COMP (Pin 7) | Error amplifier output / PWM comparator input | Drives RAMP ramp-up rate; clamped at ~10 V to limit maximum on-time and prevent inductor saturation |
| VCC (Pin 8) | Supply voltage input | Accepts 14.5–17.5 V startup range; powers logic, drivers, and internal references; includes UVLO with 5 V hysteresis |
Key Features
| Feature | Design Value |
|---|---|
| Controlled on-time PWM architecture | Enables fixed-output-voltage regulation without requiring precise line-voltage feedforward or complex multi-loop control |
| Zero-current switching (ZCS) | Reduces EMI and switching losses by ensuring MOSFET turns on only after inductor current reaches zero |
| Integrated ISNS dual-threshold comparator | Supports both soft-start current limiting (–10 mV restart) and hard fault shutdown (–450 mV), eliminating need for external comparators |
| High-current OUT driver (±1.0 A) | Eliminates external gate driver in sub-200 W PFC designs, reducing BOM count and PCB area |
| Under-voltage lockout with 5 V hysteresis | Prevents erratic operation during brown-out conditions and ensures clean startup/shutdown sequencing |
Applications
| LED Driver Input Stage | Industrial AC-DC Adapter |
|---|---|
Use Scenario: 150 W constant-current LED driver powered from universal AC input (90–264 VAC). IC Role / Device Role / Timing Role: UC2852NG4 operates as active PFC preregulator, shaping input current to match sinusoidal voltage waveform before feeding downstream LLC resonant converter. Use Value: Achieves >0.99 PF and <10% THD, enabling compliance with ENERGY STAR and IEC 61000-3-2 Class C limits without bulky passive filters. | Use Scenario: 300 W programmable DC power supply for factory automation equipment. IC Role / Device Role / Timing Role: UC2852NG4 controls boost PFC stage to deliver regulated 400 VDC bus, feeding isolated full-bridge DC-DC converter with tight voltage stability. Use Value: Enables consistent 400 V output across 85–264 VAC input range while maintaining <5% output ripple and supporting 100% load step response within 200 µs. |
| Medical Imaging Power Module | Server PSU Front-End |
Use Scenario: 500 W auxiliary power module for portable ultrasound system with strict EMI requirements. IC Role / Device Role / Timing Role: UC2852NG4 implements ZCS boost PFC to minimize conducted emissions in sensitive RF environment, preceding 12 V/48 V isolated outputs. Use Value: Reduces 150 kHz–30 MHz common-mode noise by 12 dB compared to discontinuous conduction mode (DCM) PFC, easing EMC filter design. | Use Scenario: 400 W redundant AC-DC front-end in telecom server rack power shelf. IC Role / Device Role / Timing Role: UC2852NG4 regulates bulk bus voltage in parallel-connected PFC modules, with shared VFB feedback and synchronized soft-start. Use Value: Supports hot-swap redundancy and load sharing across multiple UC2852NG4-based modules using simple resistor networks on VFB and COMP pins. |
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 |
|---|---|---|---|
| UC3852NG4 | 0°C to +70°C temperature grade; identical pinout, electrical specs, and functional block diagram | Targeted for commercial-grade systems with lower ambient thermal demands | Select UC3852NG4 only if operating environment remains within 0–70°C and cost sensitivity outweighs industrial temp margin |
| UCC28511D | Enhanced version with improved EMI performance, higher accuracy VFB (±0.5%), and integrated soft-start; SOIC-8 only | Designed for next-gen PFC stages requiring tighter regulation and faster transient response | Choose UCC28511D when upgrading legacy UC2852NG4 designs for improved THD (<5%) and reduced component count in new layouts |
Compared with UC3852NG4, UC2852NG4 offers extended industrial temperature range (–40°C to +85°C) critical for outdoor or factory-floor deployments; versus UCC28511D, it lacks integrated soft-start and has looser VFB tolerance but maintains full drop-in compatibility in existing PDIP-based boards.
Availability
UC2852NG4 is available at Aetrix Electronics and suitable for industrial AC-DC adapters, LED driver input stages, and medical imaging power modules requiring stable component supply and long-term obsolescence management.
Supply support for UC2852NG4 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 UCx852 family was developed specifically for cost-sensitive, high-efficiency active power factor correction in 50–500 W offline power supplies, emphasizing minimal external component count and robust zero-current-switched boost control.
FAQ
What is the operating temperature range specified for the UC2852NG4?
The UC2852NG4 is rated for operation from –40°C to +85°C. This industrial temperature grade distinguishes it from the UC3852NG4 (0°C to +70°C) and UC1852 (–55°C to +125°C). The specification applies to ambient temperature (Ta) under normal operating conditions with appropriate PCB thermal design and airflow. Derating curves are provided in the Unitrode databook for thermal limitations in the PDIP package.
Does the UC2852NG4 support direct replacement of the UC3852NG4 in existing designs?
Yes, the UC2852NG4 is pin-compatible and functionally identical to the UC3852NG4, differing only in temperature rating (–40°C to +85°C vs. 0°C to +70°C) and qualification testing. All electrical parameters, pin functions, and timing behavior match exactly. No PCB changes or firmware updates are required when substituting UC2852NG4 into a UC3852NG4 design, making it a seamless upgrade for enhanced thermal robustness.
What is the purpose of the ISET pin on the UC2852NG4 beyond programming RAMP current?
Beyond setting RAMP charging current (≈5 V / RISET), the ISET pin on the UC2852NG4 serves two additional roles: it provides a stable 5 V ±10% reference voltage for external circuitry, and acts as a fault indicator - pulled to ~9 V during overcurrent events to trigger external latching or restart logic. These functions eliminate need for separate reference ICs or fault comparators in compact PFC designs.
How does the UC2852NG4 achieve zero-current switching (ZCS) without auxiliary winding sensing?
The UC2852NG4 achieves ZCS by monitoring the ISNS pin voltage during inductor demagnetization. When current falls to –10 mV (typical restart threshold), the internal zero-current comparator re-enables the switch cycle. This method uses the same sense resistor as overcurrent protection, avoiding auxiliary windings or dedicated ZCD transformers while maintaining accurate timing across line and load variations.
Can the UC2852NG4 be used in continuous conduction mode (CCM) PFC topologies?
No, the UC2852NG4 is specifically designed for zero-current-switched boost (ZCS-boost), a variant of discontinuous conduction mode (DCM). Its timing architecture - relying on ISNS zero-crossing detection and RAMP discharge current - does not support true CCM operation. For CCM PFC, TI recommends the UC3854 or UCC28070 families, which implement average-current-mode control with dedicated current-sense amplifiers and slope compensation.
UC2852NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
UC2852NG4 FAQ
1.How can I place an order for UC2852NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2852NG4 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 UC2852NG4 reliable?
The price and inventory of UC2852NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2852NG4 is usually 5 days.
3.What payment methods are accepted for UC2852NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2852NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2852NG4?
UC2852NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2852NG4 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 UC2852NG4?
For technical support, including UC2852NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2852NG4 requirements.
6.How does Aetrix verify that UC2852NG4 is sourced from the original manufacturer or authorized distributors?
All UC2852NG4 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 UC2852NG4 meets industry standards.
7.What is the process for return or replacement of UC2852NG4?
All UC2852NG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC2852NG4, 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 UC2852NG4 part is unused and in its original packaging.
Return procedure for UC2852NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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