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

Texas Instruments UCC28051D

Name: UCC28051D
Brand: Texas Instruments
SKU: UCC28051D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UCC28051D

Manufacturer:: Texas Instruments

Category:: PFC (Power Factor Correction)

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: UCC28051D.pdf

Description:: IC PFC CTR TRANS 200KHZ 8SOIC

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Product details

Overview

UCC28051D from Texas Instruments is a transition-mode (boundary-conduction mode) power factor correction (PFC) controller in an 8-pin SOIC package, designed for boost preregulators in low-to-medium power AC-DC supplies. It features a transconductance error amplifier (90 µS typ), ±750-mA peak gate drive, 12.5-V UVLO turn-on threshold, and zero-power detect for light-load OVP prevention - enabling IEC 61000-3-2 compliance in AC adapters and two-stage SMPS.

For engineers reviewing the UCC28051D datasheet, UCC28051D pinout, UCC28051D application, or UCC28051D equivalent, this controller delivers precise output regulation (±0.5% VREF), fast transient response via slew-rate enhancement, and robust protection including OVP, open-feedback disable, and ZCD-based self-oscillating timing - critical for reliable front-end PFC design in compact, cost-sensitive systems.

Technical Context

The UCC28051D implements transition-mode control using zero-current detection (ZCD pin) to trigger MOSFET turn-on and current-sense (CS pin) comparison to terminate each switching cycle - eliminating external timing components and enabling variable-frequency operation. Its transconductance error amplifier (g_M = 90 µS) drives a two-input analog multiplier that generates a line-voltage-proportional current command, ensuring near-unity power factor.

Unlike the UCC28050D, the UCC28051D uses a lower 12.5-V UVLO turn-on threshold and reduced 300-µA typical COMP pin source current - allowing coordinated start-up with downstream PWM controllers in two-stage converters and preventing step-increases in input current during light-load transitions.

Key Specifications

Parameter	Value and Actual Design Meaning
Control Mode	Transition mode (boundary-conduction mode) - enables self-oscillating, zero-current-switched boost operation without external clock or ramp generator.
UVLO Turn-On Threshold	12.5 V (typ) - allows PFC stage activation only after downstream PWM controller asserts bias, supporting coordinated two-stage power sequencing.
VREF Accuracy	2.5 V ±0.5% - ensures tight output voltage regulation (e.g., 385 V ±2 V) and stable OVP/enable thresholds across temperature.
Gate Drive Strength	±750 mA peak - directly drives medium-size MOSFETs (e.g., 500–1000 pF gate charge) without external buffers, reducing BOM count.
COMP Pin Source Current	300 µA (typ) - limits initial error voltage slew rate to prevent input current overshoot at startup or light-load transients.
ZCD Input Threshold	1.7 V (typ, rising edge) - reliably detects inductor zero-crossing via auxiliary winding, enabling accurate boundary-mode timing down to 5 kHz min frequency.
OVP Activation Level	VREF + 0.18 V (typ) - clamps output at ≤392 V for 385-V nominal rails, protecting bulk capacitor and switch under open-loop or overload faults.

Pinout & Package

UCC28051D is housed in an 8-pin SOIC (D package) with 3.91 mm × 4.90 mm body size, optimized for surface-mount assembly and thermal performance (R_θJA = 113.6°C/W).

Pin/Terminal	Circuit Role	Design Meaning
VO_SNS (Pin 1)	Inverting input to transconductance amplifier & OVP comparator	Senses regulated output via resistor divider; pulls DRV low if open-circuited (enable function) or exceeds VREF+0.18 V (OVP).
COMP (Pin 2)	Error amplifier output & multiplier input	Drives internal multiplier; voltage range 2.5–3.8 V defines current command magnitude; 300-µA source current prevents startup current surge.
MULTIN (Pin 3)	Multiplier input for rectified line voltage	Accepts 0–2.5 V signal from AC line divider; offset of ~75 mV improves zero-crossing THD performance.
CS (Pin 4)	PWM current-sense comparator input	Detects MOSFET peak current; internal clamp limits switching when >1.7 V; supports noise filtering without mandatory external RC.
ZCD (Pin 5)	Zero-current detector input	Monitors boost inductor auxiliary winding; triggers turn-on when inductor current reaches zero; internal clamps prevent negative/overvoltage stress.
GND (Pin 6)	Power and signal reference ground	Common return for all internal circuits; requires shortest possible PCB trace to bypass capacitors and power paths.
DRV (Pin 7)	Totem-pole gate driver output	Delivers ±750 mA peak to drive N-channel MOSFET gates; rise/fall times <75 ns with 1-nF load ensure efficient switching.
VCC (Pin 8)	Supply input with UVLO	Operates from 12–18 V; 12.5-V turn-on / 9.7-V turn-off thresholds enable controlled start-up; bypass capacitor ≥0.1 µF required.

Key Features

Feature	Design Value
Zero-power detect	Shuts down DRV when COMP falls below 2.3 V - prevents overvoltage during no-load or standby, eliminating need for external bleed resistors.
Slew-rate enhanced error amplifier	Boosts COMP sink/source current to >1 mA during over/under-voltage transients - reduces output settling time by >5× vs standard 10-µA g_M output.
Integrated OVP and enable protection	Single VO_SNS pin provides dual function: feedback regulation, open-loop disable, and precise overvoltage cutoff at VREF+0.18 V.
Industry-pin-compatible upgrade	Direct replacement for legacy PFC controllers (e.g., UC3852, L6561) with improved specs - no PCB redesign needed for drop-in functional upgrade.
Low start-up current	75 µA max supply current below UVLO - enables use of high-value, low-cost start-up resistors and small VCC capacitors.

Applications

AC Adapter Front-End	Two-Stage Desktop SMPS
Use Scenario: 65-W laptop adapter with universal AC input (90–264 VAC) and regulated 19.5-V DC output. IC Role / Device Role / Timing Role: Transition-mode PFC controller generating 385-V DC bus; ZCD-driven self-oscillation sets variable switching frequency (25–150 kHz) based on line/load. Use Value: Meets IEC 61000-3-2 Class D harmonic limits with single-stage boost; 12.5-V UVLO enables clean handoff to downstream LLC controller after PFC bus stabilizes.	Use Scenario: 300-W ATX desktop PSU with separate PFC and main DC-DC stages. IC Role / Device Role / Timing Role: Primary-side PFC controller regulating bulk capacitor voltage; COMP pin interfaces with system supervisor IC for soft-start coordination. Use Value: 300-µA COMP source current prevents inrush into downstream PWM error amp; zero-power detect eliminates 1–2 W no-load dissipation in standby mode.
Lighting Ballast PFC	Set-Top Box Power Supply
Use Scenario: 120-W LED driver for commercial lighting with active PFC and constant-current output. IC Role / Device Role / Timing Role: Boost PFC controller operating in transition mode; MULTIN senses rectified line; CS monitors MOSFET current for cycle-by-cycle limiting. Use Value: Accurate 2.5-V reference enables ±1% output regulation tolerance; integrated OVP protects 400-V electrolytic bulk capacitor from overvoltage failure.	Use Scenario: 24-W STB power supply requiring low standby power (<0.5 W) and full-load efficiency >85%. IC Role / Device Role / Timing Role: PFC controller managing input stage; enable function disables DRV when VO_SNS drops below 0.23 V - ensuring safe pre-charge before main converter starts. Use Value: Low 4–6 mA operating current minimizes no-load losses; narrow 2.8-V UVLO hysteresis prevents oscillation during brownout conditions.

AC Adapter Front-End

Two-Stage Desktop SMPS

Use Scenario: 65-W laptop adapter with universal AC input (90–264 VAC) and regulated 19.5-V DC output.

IC Role / Device Role / Timing Role: Transition-mode PFC controller generating 385-V DC bus; ZCD-driven self-oscillation sets variable switching frequency (25–150 kHz) based on line/load.

Use Value: Meets IEC 61000-3-2 Class D harmonic limits with single-stage boost; 12.5-V UVLO enables clean handoff to downstream LLC controller after PFC bus stabilizes.

Use Scenario: 300-W ATX desktop PSU with separate PFC and main DC-DC stages.

IC Role / Device Role / Timing Role: Primary-side PFC controller regulating bulk capacitor voltage; COMP pin interfaces with system supervisor IC for soft-start coordination.

Use Value: 300-µA COMP source current prevents inrush into downstream PWM error amp; zero-power detect eliminates 1–2 W no-load dissipation in standby mode.

Lighting Ballast PFC

Set-Top Box Power Supply

Use Scenario: 120-W LED driver for commercial lighting with active PFC and constant-current output.

IC Role / Device Role / Timing Role: Boost PFC controller operating in transition mode; MULTIN senses rectified line; CS monitors MOSFET current for cycle-by-cycle limiting.

Use Value: Accurate 2.5-V reference enables ±1% output regulation tolerance; integrated OVP protects 400-V electrolytic bulk capacitor from overvoltage failure.

Use Scenario: 24-W STB power supply requiring low standby power (<0.5 W) and full-load efficiency >85%.

IC Role / Device Role / Timing Role: PFC controller managing input stage; enable function disables DRV when VO_SNS drops below 0.23 V - ensuring safe pre-charge before main converter starts.

Use Value: Low 4–6 mA operating current minimizes no-load losses; narrow 2.8-V UVLO hysteresis prevents oscillation during brownout conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transition-mode PFC controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC28050D	Higher 15.8-V UVLO turn-on threshold; 1.3-mA COMP source current; wider 6.3-V UVLO hysteresis.	Better suited for single-stage systems (e.g., electronic ballasts) where fast start-up with minimal VCC capacitance is prioritized over downstream coordination.	Select UCC28050D when independent PFC operation is required and no PWM handoff logic exists.
L6562ADTR	Fixed 12.5-V UVLO but lacks zero-power detect; 2.5-V reference tolerance ±1%; no slew-rate enhancement circuitry.	Requires external OVP and enable circuitry; slower transient response increases risk of output overshoot during load steps.	Choose L6562ADTR only if legacy design reuse or cost sensitivity outweighs reliability and feature advantages of UCC28051D.

Compared with UCC28050D and L6562ADTR, the UCC28051D uniquely balances coordinated start-up capability (via 12.5-V UVLO), light-load safety (zero-power detect), and dynamic stability (slew-rate enhancement) - making it optimal for modern two-stage AC-DC converters where system-level timing and fault resilience are critical.

Availability

UCC28051D is available at Aetrix Electronics and suitable for AC adapter front-ends, two-stage desktop SMPS, and set-top box power supplies requiring stable component supply, long-term lifecycle support, and TI-authorized traceability.

Supply support for UCC28051D 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 connectivity solutions with emphasis on reliability, precision, and energy efficiency.

The UCC28051D belongs to TI's transition-mode PFC controller product line, engineered specifically for cost-effective, low-to-medium power AC-DC conversion systems needing IEC 61000-3-2 compliance without complex control architecture.

FAQ

What is the UVLO behavior of the UCC28051D and how does it differ from UCC28050D?

The UCC28051D has a 12.5-V (typ) UVLO turn-on threshold and 9.7-V (typ) turn-off threshold, providing 2.8-V hysteresis - enabling controlled activation by downstream PWM controllers in two-stage power supplies. In contrast, the UCC28050D uses a 15.8-V turn-on threshold and 6.3-V hysteresis for faster standalone start-up. This difference makes the UCC28051D ideal for coordinated power sequencing, while the UCC28050D suits single-stage designs like electronic ballasts. Both share identical pinout and core functionality.

How does the zero-power detect feature work in the UCC28051D?

The UCC28051D monitors the COMP pin voltage and activates its zero-power comparator when COMP falls below 2.3 V (typ), latching DRV low to halt switching. This occurs during light-load or no-load conditions when the error amplifier output collapses, preventing output overvoltage without external circuitry. The feature is enabled by internal design - no configuration or external components are required - and is fully integrated into the UCC28051D's protection suite alongside OVP and enable functions.

Can the UCC28051D be used in continuous conduction mode (CCM) PFC designs?

No - the UCC28051D is specifically architected for transition-mode (boundary-conduction mode) operation. It relies on ZCD pin detection of inductor zero-current to initiate each switching cycle and uses self-oscillating timing, which is incompatible with fixed-frequency CCM control. For CCM PFC, TI recommends dedicated controllers such as the UCC28070 or UCC28180. Attempting CCM operation with the UCC28051D will result in unstable regulation and potential overcurrent faults.

What is the purpose of the slew-rate enhancement circuit in the UCC28051D error amplifier?

The slew-rate enhancement circuit in the UCC28051D's transconductance amplifier boosts COMP pin sink/source current to >1 mA when VO_SNS deviates beyond 88–105% of VREF - accelerating compensation capacitor charging/discharging during large transients. This reduces output voltage recovery time after load steps or line surges by up to 5× compared to standard 10-µA operation, maintaining regulation integrity without external compensation tweaks. The UCC28051D's 300-µA nominal source current still ensures smooth startup behavior.

Does the UCC28051D require external components for ZCD interface, and what are the key layout considerations?

The UCC28051D includes internal ZCD clamps (0.3–6 V range) and accepts direct connection from a boost inductor auxiliary winding, but a series current-limiting resistor is mandatory to keep ZCD pin current below ±10 mA. Layout must minimize trace length between ZCD and auxiliary winding, avoid routing near noisy nodes (e.g., MOSFET drain), and use local 0.1-µF ceramic decoupling. TI's SLUS515G datasheet specifies R_ZCD selection based on winding turns ratio and peak ZCD voltage to ensure reliable zero-crossing detection above 1.7 V.

UCC28051D Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Mode:: Discontinuous (Transition)

Frequency - Switching:: 200kHz

Current - Startup:: 75 µA

Voltage - Supply:: 12V ~ 18V

Operating Temperature:: -40°C ~ 105°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

UCC28051D FAQ

1.How can I place an order for UCC28051D through Aetrix?

Please submit a Request for Quotation (RFQ) for UCC28051D 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 UCC28051D reliable?

The price and inventory of UCC28051D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28051D is usually 5 days.

3.What payment methods are accepted for UCC28051D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28051D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UCC28051D?

UCC28051D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UCC28051D 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 UCC28051D?

For technical support, including UCC28051D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28051D requirements.

6.How does Aetrix verify that UCC28051D is sourced from the original manufacturer or authorized distributors?

All UCC28051D 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 UCC28051D meets industry standards.

7.What is the process for return or replacement of UCC28051D?

All UCC28051D units undergo pre-shipment inspection (PSI). If there is an issue with UCC28051D, 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 UCC28051D part is unused and in its original packaging.

Return procedure for UCC28051D:

1.Submit a request within 90 days.

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

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