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Texas Instruments UC3852NG4
- Part No.:
- UC3852NG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
UC3852NG4.pdf
- Description:
- IC PFC CTRLR CCM 200KHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,531
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Product details
Overview
UC3852NG4 from Texas Instruments is a high-performance active power factor correction (PFC) controller IC designed for zero-current-switched boost preregulators in 50–500 W AC/DC systems. It delivers >0.99 power factor, features controlled on-time PWM, zero-current sensing, under-voltage lockout, and ±1.0 A peak gate drive output - enabling compact, low-noise PFC stages in universal-input offline power supplies.
For engineers reviewing the UC3852NG4 datasheet, UC3852NG4 pinout, UC3852NG4 application, or UC3852NG4 equivalent, this device is selected for cost-sensitive, high-efficiency AC-DC front-end designs requiring precise bulk voltage regulation, harmonic current suppression per IEC 61000-3-2 Class D, and robust overcurrent/frequency limiting without external timing ICs.
Technical Context
The UC3852NG4 implements a variable-frequency, zero-current-switched (ZCS) boost topology where switch on-time is controlled by the error amplifier output (COMP), off-time is determined by inductor discharge, and conduction restart is triggered by ISNS crossing –10 mV. Its RAMP timer uses externally programmable charge current (via ISET resistor) and capacitor to set minimum on-time and maximum frequency limits.
It integrates a high-current gate driver (±1.0 A peak), internal 5 V reference at ISET, dual comparators for zero-current detection and overcurrent fault (–450 mV threshold), and UVLO with 16.3 V turn-on/11.5 V turn-off hysteresis. The error amplifier provides 60 dB gain at 10 kHz with phase margin suitable for stable voltage-loop compensation in boost PFC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Turn-On Threshold | 16.3 V - ensures reliable startup after bulk capacitor charges above brownout level |
| ISNS Fault Threshold | –450 mV - triggers immediate cycle disable during overcurrent events, protecting MOSFET and inductor |
| OUT Peak Current | ±1.0 A - directly drives IRF830-class MOSFET gates without external buffer, reducing BOM count |
| Power Factor | >0.99 - meets IEC 61000-3-2 Class D harmonic limits for 100 W–500 W equipment |
| Operating Temperature | 0°C to +70°C - rated for commercial-grade power supply environments, not extended industrial |
| ISET Reference Voltage | 5.0 V ±10% - provides stable programming node for RAMP charge current (e.g., 50 kΩ → ~100 µA) |
| Max Frequency Limit | 100 kHz (typ.) - constrains EMI generation while maintaining ZCS operation across line/load range |
Pinout & Package
UC3852NG4 is housed in an 8-pin plastic dual in-line package (PDIP-8), with lead finish NIPDAU and no moisture sensitivity rating (N/A for Pkg Type). Pin 1 is GND; pin orientation follows standard DIP marking convention with notch-left identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal and power ground reference | Common return for all analog and power circuits; must be low-impedance star point to minimize noise coupling into ISNS/COMP |
| OUT (Pin 2) | High-current gate driver output | Drives MOSFET gate with ±1.0 A peak; clamped to 12 V internally to limit Miller plateau stress |
| VFB (Pin 3) | Inverting input of error amplifier | Connects to resistive divider from 400 V bulk output; sets regulated DC bus voltage (e.g., 400 V via 1 MΩ/20 kΩ) |
| COMP (Pin 4) | Error amplifier output / PWM comparator input | Integrates voltage loop error; clamped to ~10 V to limit max on-time and prevent inductor saturation |
| ISET (Pin 5) | RAMP charge current programming & FAULT indicator | 5 V reference source; connects to GND via resistor (e.g., 50 kΩ) to set RAMP current; pulled to ~9 V during overcurrent fault |
| RAMP (Pin 6) | Timer capacitor node | Charged by ISET current; discharged when ISNS crosses zero; defines on-time duration and max frequency |
| ISNS (Pin 7) | Zero- and over-current sense input | Accepts ±5 V range; senses MOSFET source current via shunt; restarts switching at –10 mV, faults at –450 mV |
| VCC (Pin 8) | Supply input (14.5–30 V) | Power for logic, driver, and analog blocks; includes UVLO with 5 V hysteresis to prevent erratic startup |
Key Features
| Feature | Design Value |
|---|---|
| Controlled On-Time PWM | Enables fixed-output-voltage regulation in ZCS boost without external oscillator, simplifying loop design |
| Zero-Current Switching | Reduces EMI and MOSFET switching losses by ensuring turn-on only after inductor current reaches zero |
| Integrated 5 V Reference | Stable ISET output eliminates need for external reference, enabling accurate RAMP current programming |
| High-Current Gate Driver | ±1.0 A peak output drives 10 nC gate charge MOSFETs directly, avoiding discrete buffers and layout complexity |
| Under-Voltage Lockout | 16.3 V turn-on / 11.5 V turn-off hysteresis prevents unstable operation during AC brownouts or soft-start transients |
Applications
| LED Driver Front-End | PC Power Supply PFC Stage |
|---|---|
|
Use Scenario: 100 W constant-current LED driver operating from 90–264 VAC input. IC Role / Device Role / Timing Role: UC3852NG4 serves as the active PFC preregulator, generating 400 VDC bulk bus with THD <10%. Use Value: Enables compliance with ENERGY STAR and IEC 61000-3-2 Class C limits while reducing input filter size by 40% vs. passive PFC. |
Use Scenario: ATX-compliant desktop PSU requiring >0.9 PF and <15% THD at full load. IC Role / Device Role / Timing Role: UC3852NG4 controls ZCS boost converter to regulate 380–400 VDC main rail before LLC resonant stage. Use Value: Achieves >0.99 PF across 20–100% load with single-stage architecture, eliminating need for auxiliary controllers. |
| Industrial Motor Drive Input Stage | Medical AC/DC Adapter |
|
Use Scenario: 300 W variable-speed drive accepting universal AC input with EMC certification requirements. IC Role / Device Role / Timing Role: UC3852NG4 implements harmonic-suppressed rectification prior to DC link capacitor and inverter stage. Use Value: Meets EN 61000-3-2 Class A limits up to 350 W, allowing smaller EMI filters and reduced heatsink mass. |
Use Scenario: 250 W medical-grade AC/DC adapter certified to IEC 60601-1 and IEC 61000-3-2 Class D. IC Role / Device Role / Timing Role: UC3852NG4 regulates bulk voltage in isolated flyback+PFC hybrid topology with safety-isolated feedback. Use Value: Delivers >0.99 PF with <8% THD at 230 VAC/50 Hz, supporting double-insulation requirements without derating. |
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 |
|---|---|---|---|
| UC2852N | Wider temperature range (–40°C to +85°C); identical pinout and electrical specs except Ta rating | Suitable for industrial ambient conditions; requires no schematic or layout change | Select UC2852N when operating outside 0–70°C commercial range, especially in enclosed or thermally stressed enclosures |
| L6562A | Different control architecture (average-current-mode); higher integration (no external RAMP cap); 16-pin SOIC | Requires redesigned compensation network and gate drive layout; supports higher power density but needs more design validation | Choose L6562A for new designs targeting >400 W with tighter footprint constraints and willingness to requalify control loop stability |
Compared with UC3852NG4, UC2852N offers extended temperature capability without functional or pinout changes, while L6562A provides average-current-mode control with integrated oscillator - trading design familiarity for higher integration and different loop dynamics.
Availability
UC3852NG4 is available at Aetrix Electronics and suitable for LED drivers, PC power supplies, industrial motor drives, and medical AC/DC adapters requiring stable component supply and legacy-compatible PFC control.
Supply support for UC3852NG4 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 UC3852NG4 belongs to TI's legacy Unitrode PFC controller family, engineered specifically for cost-effective, high-power-factor AC/DC conversion in commercial-grade offline power supplies up to 500 W.
FAQ
What is the primary function of the UC3852NG4 in a power supply design?
The UC3852NG4 functions as an active power factor correction (PFC) controller IC that regulates the input current waveform to match the AC voltage sine wave, achieving >0.99 power factor in boost-converter-based preregulators. In a typical implementation, UC3852NG4 senses bulk voltage via VFB, monitors inductor current through ISNS, and drives the MOSFET gate via OUT to maintain sinusoidal line current - directly enabling compliance with IEC 61000-3-2 harmonic standards.
Can the UC3852NG4 replace the UC3852N in an existing design?
Yes, UC3852NG4 is a direct replacement for UC3852N: both share identical PDIP-8 packaging, pinout, electrical specifications, and 0°C to +70°C operating range. The "G4" suffix denotes TI's green packaging standard (lead-free, RoHS-compliant NIPDAU finish) with no functional or timing differences. No PCB or firmware changes are required when upgrading from UC3852N to UC3852NG4.
What is the role of the ISET pin on the UC3852NG4, and how is it configured?
The ISET pin on UC3852NG4 serves three roles: (1) programming RAMP charge current via external resistor to GND (e.g., 50 kΩ yields ~100 µA), (2) providing a stable 5.0 V ±10% reference for biasing, and (3) acting as a fault indicator - pulled to ~9 V during overcurrent events. For proper UC3852NG4 operation, ISET must connect only to its programming resistor; additional loads degrade reference accuracy and fault signaling integrity.
How does the UC3852NG4 implement zero-current switching, and why is it important?
The UC3852NG4 implements zero-current switching (ZCS) by monitoring the ISNS pin for inductor current decay to zero using a –10 mV restart threshold. When ISNS crosses this level, the internal comparator re-enables the OUT driver, ensuring MOSFET turn-on occurs only after current reaches zero - minimizing switching losses and EMI. This ZCS behavior is fundamental to UC3852NG4's efficiency and noise performance in discontinuous-conduction-mode boost PFC stages.
What protection features are built into the UC3852NG4?
UC3852NG4 integrates under-voltage lockout (UVLO), peak-current limiting (via ISNS fault threshold of –450 mV), maximum-frequency clamping (via RAMP threshold), output clamping (12 V internal clamp on OUT), and thermal-safe shutdown via package-limited power dissipation. These protections operate autonomously - for example, during overload, UC3852NG4 disables switching within one cycle upon detecting ISNS < –450 mV, preventing MOSFET failure without external circuitry.
UC3852NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Mode:
- Continuous Conduction (CCM)
- Frequency - Switching:
- 200kHz
- Current - Startup:
- 400 µA
- Voltage - Supply:
- 14.5V ~ 30V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
UC3852NG4 FAQ
1.How can I place an order for UC3852NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3852NG4 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 UC3852NG4 reliable?
The price and inventory of UC3852NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3852NG4 is usually 5 days.
3.What payment methods are accepted for UC3852NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3852NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3852NG4?
UC3852NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3852NG4 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 UC3852NG4?
For technical support, including UC3852NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3852NG4 requirements.
6.How does Aetrix verify that UC3852NG4 is sourced from the original manufacturer or authorized distributors?
All UC3852NG4 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 UC3852NG4 meets industry standards.
7.What is the process for return or replacement of UC3852NG4?
All UC3852NG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3852NG4, 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 UC3852NG4 part is unused and in its original packaging.
Return procedure for UC3852NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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