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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > PFC (Power Factor Correction)

Texas Instruments UCC28502DW

Name: UCC28502DW
Brand: Texas Instruments
SKU: UCC28502DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UCC28502DW

Manufacturer:: Texas Instruments

Category:: PFC (Power Factor Correction)

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: UCC28502DW.pdf

Description:: IC PFC CTR AVERAGE 100KHZ 20SOIC

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Product details

Overview

UCC28502DW from Texas Instruments is a dual-stage active power factor correction (PFC) and DC-DC controller IC integrating average-current-mode PFC with peak-current-mode downstream PWM control. It delivers near-unity power factor, programmable 80–120 kHz oscillator frequency, 16.5 V/10 V UVLO threshold with 6.3 V hysteresis, and synchronized leading-edge (PFC) / trailing-edge (PWM) modulation to minimize bulk capacitor ripple. Used in universal-input AC-DC supplies for telecom and industrial power systems.

For engineers reviewing the UCC28502DW datasheet, UCC28502DW pinout, UCC28502DW application, or UCC28502DW equivalent, key selection criteria include its dual-stage control architecture, PFC+PWM synchronization capability, wide-input-voltage feedforward (VFF) implementation, and 50% maximum duty cycle clamp on GT2 for transformer reset assurance.

Technical Context

The UCC28502DW implements a two-stage control architecture: the PFC stage uses average current-mode control with a high-linearity analog multiplier (IAC input, MOUT output), voltage amplifier (VAOUT), and leading-edge PWM on GT1; the second stage employs peak current-mode control via ISENSE2, VERR error signal interface, and trailing-edge PWM on GT2. Internal line feedforward (VFF) derived from IAC enables constant input power across 85–265 V_RMS input.

It features independent UVLO thresholds-16.5 V turn-on / 10 V turn-off for VCC (bootstrap bias), and 6.75 V turn-on with 3.0 V hysteresis for UVLO2 (PWM stage enable)-allowing reliable operation down to 50% of nominal bulk voltage. Zero-power detection at VAOUT < 0.33 V disables outputs during no-load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Oscillator Frequency	80–120 kHz; set by RT/CT network; initial accuracy ±15% at 25°C ensures stable switching across line/load
VCC UVLO Threshold	16.5 V turn-on / 10 V turn-off; supports bootstrap bias supply without auxiliary winding
UVLO2 Hysteresis	3.0 V; enables robust second-stage shutdown when PFC output drops below 50% nominal voltage
Reference Voltage	7.5 V ±15 mV over –40°C to 85°C; powers external circuitry and sets PKLMT scaling
GT1/GT2 Drive Capability	1.2 A pulsed / 0.2 A continuous; drives MOSFET gates directly with 25–50 ns rise/fall times (1 nF load)
PFC Current Sense Input	IAC accepts up to 500 µA; enables low-distortion RMS feedforward without high-voltage components
Second-Stage Duty Cycle Limit	50% max; enforced by internal clamp on VERR to guarantee transformer reset in forward/isolated topologies

Pinout & Package

UCC28502DW is housed in a 20-pin SOIC (DW) package with 0.300-inch body width, gull-wing leads, and thermal pad not electrically connected. Pin assignments are identical to the N-package variant per TI SLUS419C.

Pin/Terminal	Circuit Role	Design Meaning
GT1	PFC gate driver output	Totem-pole MOSFET driver for boost switch; leading-edge modulated; 93–100% duty cycle capable
GT2	DC-DC gate driver output	Trailing-edge PWM output for second-stage switch; internally clamped to ≤50% duty cycle
IAC	AC line current sensing input	Current-mode input (≤500 µA) to analog multiplier; used to generate VFF feedforward voltage
VFF	RMS feedforward signal node	Generated by mirroring IAC; sets multiplier gain to maintain constant input power across 3:1 line range
VAOUT	PFC voltage amplifier output	Regulates boost output voltage; clamped to ~5.5 V to prevent overshoot during transients
VERR	Second-stage error signal input	Accepts opto-coupled error signal from secondary side; 4.5 V internal clamp enforces ≤50% duty cycle
PKLMT	PFC peak current limit threshold	0 V reference; resistor divider from current-sense resistor to VREF sets overcurrent trip point
OVP/ENBL	PFC overvoltage & second-stage enable	Window comparator: disables PFC if boost > +6.67%, disables both stages if pulled < 1.9 V
SS2	Second-stage soft-start capacitor	Charged by –10 µA current source; controls PWM ramp-up; rapidly discharged on fault or disable
VREF	Internal 7.5 V reference output	Stable 7.5 V ±15 mV reference; supplies bias to external circuits; disabled below UVLO

Key Features

Feature	Design Value
Integrated dual-stage control	Single-chip solution eliminates separate PFC and PWM controllers, reducing BOM count and layout complexity
Synchronized modulation scheme	Leading-edge PFC + trailing-edge PWM minimizes overlap conduction, cutting bulk capacitor ripple current by >30% vs unsynchronized designs
Line feedforward (VFF) generation	VFF derived from IAC via internal 2:1 mirror and external RC filter-no high-voltage dividers or precision op-amps required
Programmable soft-start & shutdown	SS2 pin enables controlled second-stage ramp-up; UVLO2 threshold (6.75 V ±0.45 V) allows graceful shutdown at 50% bulk voltage
Zero-power detection	Internal comparator triggers at VAOUT < 0.33 V, disabling outputs to eliminate standby losses in no-load conditions

Applications

Telecom Rectifier Modules	Industrial AC-DC Power Supplies
Use Scenario: 48 V/30 A rectifier operating from 85–265 V_RMS universal AC input with hold-up time ≥16 ms. IC Role / Device Role / Timing Role: UCC28502DW performs PFC regulation and isolated forward converter control; synchronizes GT1/GT2 edges to reduce EMI and capacitor stress. Use Value: Enables single-stage design meeting EN61000-3-2 Class A harmonic limits while maintaining >85% full-load efficiency.	Use Scenario: DIN-rail mounted 24 V/20 A power supply for PLC and motor drive control cabinets. IC Role / Device Role / Timing Role: UCC28502DW manages boost PFC and downstream half-bridge DC-DC conversion; uses VFF to maintain stable power delivery across wide input fluctuations. Use Value: UVLO2 hysteresis (3.0 V) ensures reliable restart after brownouts without latch-up, supporting continuous operation in harsh factory environments.
Medical Equipment Power Systems	Server Front-End Power Supplies
Use Scenario: 12 V/10 A isolated power module for diagnostic imaging equipment requiring low audible noise and <0.5% output ripple. IC Role / Device Role / Timing Role: UCC28502DW executes average-current PFC and peak-current forward control; trailing-edge GT2 modulation suppresses low-frequency ripple. Use Value: SS2-controlled soft-start prevents inrush-induced voltage sag on shared hospital AC circuits during cold start.	Use Scenario: 12 V/100 A front-end supply in 1U server chassis with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: UCC28502DW integrates PFC and LLC-compatible PWM control; GT1/GT2 timing coordination reduces common-mode noise coupling into data buses. Use Value: 50% GT2 duty-cycle clamp guarantees safe transformer reset in high-frequency forward topologies, enabling smaller magnetics and lower core loss.

Telecom Rectifier Modules

Industrial AC-DC Power Supplies

Use Scenario: 48 V/30 A rectifier operating from 85–265 V_RMS universal AC input with hold-up time ≥16 ms.

IC Role / Device Role / Timing Role: UCC28502DW performs PFC regulation and isolated forward converter control; synchronizes GT1/GT2 edges to reduce EMI and capacitor stress.

Use Value: Enables single-stage design meeting EN61000-3-2 Class A harmonic limits while maintaining >85% full-load efficiency.

Use Scenario: DIN-rail mounted 24 V/20 A power supply for PLC and motor drive control cabinets.

IC Role / Device Role / Timing Role: UCC28502DW manages boost PFC and downstream half-bridge DC-DC conversion; uses VFF to maintain stable power delivery across wide input fluctuations.

Use Value: UVLO2 hysteresis (3.0 V) ensures reliable restart after brownouts without latch-up, supporting continuous operation in harsh factory environments.

Medical Equipment Power Systems

Server Front-End Power Supplies

Use Scenario: 12 V/10 A isolated power module for diagnostic imaging equipment requiring low audible noise and <0.5% output ripple.

IC Role / Device Role / Timing Role: UCC28502DW executes average-current PFC and peak-current forward control; trailing-edge GT2 modulation suppresses low-frequency ripple.

Use Value: SS2-controlled soft-start prevents inrush-induced voltage sag on shared hospital AC circuits during cold start.

Use Scenario: 12 V/100 A front-end supply in 1U server chassis with strict thermal and EMI constraints.

IC Role / Device Role / Timing Role: UCC28502DW integrates PFC and LLC-compatible PWM control; GT1/GT2 timing coordination reduces common-mode noise coupling into data buses.

Use Value: 50% GT2 duty-cycle clamp guarantees safe transformer reset in high-frequency forward topologies, enabling smaller magnetics and lower core loss.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-stage PFC+PWM controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC28502N	Same electrical specs; 20-pin PDIP package with larger footprint and higher thermal resistance	Preferred for prototyping or through-hole assembly; less suitable for high-density or thermally constrained PCBs	Select UCC28502N only when manual soldering or socket-based validation is required
UCC38502DW	Identical pinout and functionality; rated for 0°C to 70°C ambient (vs –40°C to 85°C for UCC28502DW)	Valid for commercial-grade applications only; not qualified for industrial temperature cycling or extended life testing	Choose UCC38502DW for deployments requiring extended temperature range compliance and long-term reliability

Compared with UCC28502N and UCC38502DW, the UCC28502DW provides the widest operating temperature range (–40°C to 85°C), lowest thermal impedance in SOIC packaging, and full qualification for industrial power systems-making it the optimal choice for mission-critical AC-DC conversion where ambient stability and long-term parametric drift matter.

Availability

UCC28502DW is available at Aetrix Electronics and suitable for telecom rectifiers, industrial AC-DC power supplies, medical equipment power systems, and server front-end power supplies requiring stable component supply and long lifecycle support.

Supply support for UCC28502DW 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The UCC2850x product line was engineered specifically for cost-sensitive, high-efficiency active PFC + isolated DC-DC power supplies targeting universal-input AC-DC conversion in industrial, telecom, and medical equipment.

FAQ

What is the primary function of the UCC28502DW in an AC-DC power supply?

The UCC28502DW serves as a dual-stage controller IC that simultaneously manages active power factor correction (PFC) using average current-mode control and regulates a downstream isolated DC-DC converter using peak current-mode control. Its integrated architecture eliminates the need for separate PFC and PWM controllers, reducing system complexity and component count in universal-input power supplies.

How does the UCC28502DW implement line voltage feedforward (VFF)?

The UCC28502DW generates VFF by mirroring the IAC input current (up to 500 µA) with an internal 2:1 current mirror onto the VFF pin. An external RC filter converts this current into a voltage proportional to RMS line voltage-enabling constant input power regulation across 85–265 V_RMS without high-voltage resistive dividers. This is confirmed in Figure 6 and Section 6 of SLUS419C.

What is the purpose of the 50% duty cycle clamp on GT2 in the UCC28502DW?

The 50% duty cycle clamp on GT2 ensures safe transformer reset in forward or push-pull isolated topologies by preventing excessive duty cycles that could saturate the transformer core. This clamp is enforced via an internal 4.5 V voltage limit on the VERR pin, which directly governs GT2's PWM comparator threshold-guaranteeing reliable operation even under transient overload conditions.

Can the UCC28502DW operate with a fixed 12-V bias supply instead of bootstrap configuration?

No-the UCC28502DW requires a VCC supply with 16.5 V turn-on / 10 V turn-off UVLO thresholds, making it incompatible with fixed 12-V bias rails. It is designed for bootstrap operation where VCC is derived from the PFC output bus. For fixed-bias applications, TI recommends the UCC28501 or UCC28503 variants, which feature a 10.5 V UVLO threshold.

What protection features are built into the UCC28502DW?

The UCC28502DW integrates overvoltage protection (OVP) on the PFC output via OVP/ENBL pin, zero-power detection (disables outputs when VAOUT < 0.33 V), PFC peak current limiting (via PKLMT), second-stage pulse-by-pulse current limiting (ISENSE2), and dual-stage undervoltage lockout (UVLO and UVLO2). All protections are hardware-based with no software dependency.

UCC28502DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Mode:: Average Current

Frequency - Switching:: 100kHz

Current - Startup:: 150 µA

Voltage - Supply:: 9.7V ~ 18V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

UCC28502DW FAQ

1.How can I place an order for UCC28502DW through Aetrix?

Please submit a Request for Quotation (RFQ) for UCC28502DW 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 UCC28502DW reliable?

The price and inventory of UCC28502DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28502DW is usually 5 days.

3.What payment methods are accepted for UCC28502DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28502DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UCC28502DW?

UCC28502DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UCC28502DW 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 UCC28502DW?

For technical support, including UCC28502DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28502DW requirements.

6.How does Aetrix verify that UCC28502DW is sourced from the original manufacturer or authorized distributors?

All UCC28502DW 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 UCC28502DW meets industry standards.

7.What is the process for return or replacement of UCC28502DW?

All UCC28502DW units undergo pre-shipment inspection (PSI). If there is an issue with UCC28502DW, 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 UCC28502DW part is unused and in its original packaging.

Return procedure for UCC28502DW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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