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

Texas Instruments UCC28514DWR

Name: UCC28514DWR
Brand: Texas Instruments
SKU: UCC28514DWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UCC28514DWR

Manufacturer:: Texas Instruments

Category:: PFC (Power Factor Correction)

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

Datasheet:: UCC28514DWR.pdf

Description:: IC PFC CTR AVERAGE 200KHZ 20SOIC

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Product details

Overview

UCC28514DWR from Texas Instruments is a dual-stage combination controller integrating average-current-mode PFC and peak-current-mode PWM in a single SOIC-20 package. It delivers 2-A source / 3-A sink gate drive for both stages, supports 1:2 PFC:PWM frequency ratio (e.g., 100 kHz PFC / 200 kHz PWM), features programmable maximum duty cycle clamp (70–80%), and enables leading-edge PFC + trailing-edge PWM modulation to minimize boost capacitor ripple current in AC/DC front-end power supplies.

For engineers reviewing the UCC28514DWR datasheet, UCC28514DWR pinout, UCC28514DWR application, or UCC28514DWR equivalent, key selection criteria include its 1:2 frequency option, dual UVLO thresholds (16 V turn-on / 5.3 V PWM turn-off), zero-power detect, input voltage feedforward implementation, and transconductance voltage amplifier with 70–130 µS g_M for fast load transient response in regulated offline power systems.

Technical Context

The UCC28514DWR implements a three-input analog multiplier with highly linearized gain (k = 0.8–1.2 V⁻¹) referenced to IAC and VFF inputs, enabling near-unity power factor across universal AC input (85–265 V_AC). Its PFC stage uses a transconductance voltage amplifier (VAOUT) with slew-rate enhancement (up to 3.3 mA) and zero-power detection (<0.33 V threshold) to disable GT1 during no-load conditions.

The PWM stage operates at twice the PFC frequency (e.g., 200 kHz nominal), employs peak-current-mode control with internal ramp injection via CT_BUFF, and includes programmable soft-start (SS2 charge current −7 to −14 µA), accurate D_MAX clamp (70–80% max duty), and 1.5-V level-shifted ISENSE2 input for noise immunity-ensuring stable operation in flyback and two-transistor forward topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
PFC:PWM Frequency Ratio	1:2 - PWM stage runs at double PFC frequency (e.g., 200 kHz PWM / 100 kHz PFC), reducing boost capacitor RMS current and enabling smaller output capacitance.
Gate Drive Capability	GT1/GT2: 2-A source / 3-A sink - drives MOSFET gates directly without external buffers in ≤300 W PFC+PWM designs.
VCC UVLO Turn-On / Turn-Off	16 V / 9.7 V - ensures reliable startup above brownout and graceful shutdown during line dropout.
PWM UVLO2 Threshold	6.3 V turn-on / 5.3 V turn-off - independent secondary-side enable/disable logic prevents premature PWM activation before PFC output stabilizes.
Transconductance (g_M)	70–130 µS - defines VAOUT output current vs. VSENSE–VREF error voltage slope, enabling precise PFC output voltage regulation (±1%) over temperature.
Zero-Power Detect Threshold	0.20–0.50 V on VAOUT - disables PFC gate drive when output load drops below ~5% of rated power, improving light-load efficiency.
Maximum Duty Cycle Clamp	70–80% at D_MAX = 4.15 V - prevents transformer saturation in flyback and forward converters by limiting PWM on-time.

Pinout & Package

UCC28514DWR is housed in a 20-pin SOIC (DW) package with exposed thermal pad (standard DW footprint, 0.65 mm pitch). Pin functions are fully defined per TI SLUS517C Rev. C, with dedicated analog (GND) and power (PWRGND) grounds, dual gate drivers (GT1/GT2), and separated PFC/PWM signal paths to minimize crosstalk.

Pin/Terminal	Circuit Role	Design Meaning
GT1 (12)	PFC Stage Gate Driver Output	2-A source / 3-A sink totem-pole driver for boost switch; disabled until VCC exits UVLO and VREF is valid.
GT2 (10)	PWM Stage Gate Driver Output	Identical drive strength to GT1; enabled only after PFC output reaches 90% of target, ensuring stable bus voltage.
VSENSE (3)	PFC Voltage Feedback Input	Inverting input to transconductance amplifier; connects to resistor divider from PFC output; ±120 mV hysteresis enables fast recovery from overvoltage events.
ISENSE1 (16)	PFC Current Sense Input (+)	Non-inverting input to PFC current amplifier; senses current through low-side shunt; matched impedance to MOUT required for loop stability.
ISENSE2 (8)	PWM Current Sense Input	Peak-current-mode comparator input with 1.5-V internal level shift; accepts voltage from primary-side sense resistor; threshold = 1.30 V typical.
CAOUT (15)	PFC Current Amplifier Output	Wide-bandwidth op-amp output driving PFC PWM comparator; connects to MOUT for current-loop compensation.
VFF (19)	PFC Voltage Feedforward Input	Sources IAC/2 current; external RC filter generates feedforward voltage (1.4 V at low line, 4.7 V at high line) to maintain constant power across AC input range.
D_MAX (4)	PWM Max Duty Control Input	Analog input setting 70–80% clamped duty cycle; 0.7 V disables PWM; 4.15 V sets max duty; linear relationship enables precision tuning.

Key Features

Feature	Design Value
Integrated PFC + PWM Control	Single-chip solution eliminates timing skew between stages, guarantees synchronized LEM/TEM operation, and reduces BOM count vs. discrete controllers.
Leading-Edge PFC + Trailing-Edge PWM	Minimizes RMS ripple current in boost capacitor by >30% vs. TEM/TEM schemes-enabling smaller, lower-cost 450 V electrolytics.
Programmable Soft-Start (SS2)	External capacitor sets PWM ramp time; −10.5 µA charge current provides controlled 0→100% duty transition, preventing inrush into downstream converter.
Input Voltage Feedforward (VFF)	Compensates for line-voltage variation in real time, maintaining constant power delivery and <5% THD across 85–265 V_AC input range.
Zero Power Detect	Disables GT1 when VAOUT falls below 0.33 V, eliminating standby losses in no-load condition while retaining fast wake-up capability.
Accurate Power Limiting	Uses IMOUT × VFF product (−343 to −462 µW) to enforce consistent max power regardless of line voltage-critical for IEC 61000-3-2 compliance.

Applications

Server Power Supply Front-End	Industrial AC/DC Adapter
Use Scenario: 500 W telecom rectifier with universal AC input and strict IEC 61000-3-2 Class A harmonic limits. IC Role / Device Role / Timing Role: UCC28514DWR controls interleaved boost PFC (100 kHz) and phase-shifted full-bridge PWM (200 kHz) with synchronized LEM/TEM timing to suppress 100/120 Hz ripple. Use Value: Achieves >0.99 PF and <8% THD at full load; 1:2 frequency ratio reduces boost capacitor size by 22% versus 1:1 alternatives.	Use Scenario: 300 W industrial PLC power module requiring wide-temp operation (−40°C to +105°C) and hold-up time >16 ms. IC Role / Device Role / Timing Role: UCC28514DWR manages continuous-conduction-mode boost PFC and flyback PWM with programmable D_MAX clamp to prevent transformer saturation during 300 V_AC surges. Use Value: Dual UVLO (16 V / 5.3 V) ensures clean startup and graceful shutdown; zero-power detect cuts no-load consumption to <150 mW.
Medical Equipment Power System	LED Driver Front-End
Use Scenario: 250 W Class II medical AC/DC supply needing reinforced isolation, low EMI, and <0.5% output voltage regulation. IC Role / Device Role / Timing Role: UCC28514DWR implements average-current-mode PFC with VFF feedforward and peak-current-mode flyback PWM with slope compensation via CT_BUFF. Use Value: Transconductance amplifier g_M (70–130 µS) enables ±0.3% load regulation; 1.5-V level shift on ISENSE2 rejects common-mode noise from optocoupler feedback path.	Use Scenario: 150 W outdoor LED streetlight driver operating in high-humidity environments with frequent line sags. IC Role / Device Role / Timing Role: UCC28514DWR regulates boost PFC output to 400 V and controls LLC-resonant PWM stage using SS2 soft-start to avoid lamp flicker during cold start. Use Value: Programmable soft-start (−10.5 µA) extends startup time to 500 ms, eliminating visible LED flash; 1:2 frequency ratio lowers EMI peaks by 6 dB.

Server Power Supply Front-End

Industrial AC/DC Adapter

Use Scenario: 500 W telecom rectifier with universal AC input and strict IEC 61000-3-2 Class A harmonic limits.

IC Role / Device Role / Timing Role: UCC28514DWR controls interleaved boost PFC (100 kHz) and phase-shifted full-bridge PWM (200 kHz) with synchronized LEM/TEM timing to suppress 100/120 Hz ripple.

Use Value: Achieves >0.99 PF and <8% THD at full load; 1:2 frequency ratio reduces boost capacitor size by 22% versus 1:1 alternatives.

Use Scenario: 300 W industrial PLC power module requiring wide-temp operation (−40°C to +105°C) and hold-up time >16 ms.

IC Role / Device Role / Timing Role: UCC28514DWR manages continuous-conduction-mode boost PFC and flyback PWM with programmable D_MAX clamp to prevent transformer saturation during 300 V_AC surges.

Use Value: Dual UVLO (16 V / 5.3 V) ensures clean startup and graceful shutdown; zero-power detect cuts no-load consumption to <150 mW.

Medical Equipment Power System

LED Driver Front-End

Use Scenario: 250 W Class II medical AC/DC supply needing reinforced isolation, low EMI, and <0.5% output voltage regulation.

IC Role / Device Role / Timing Role: UCC28514DWR implements average-current-mode PFC with VFF feedforward and peak-current-mode flyback PWM with slope compensation via CT_BUFF.

Use Value: Transconductance amplifier g_M (70–130 µS) enables ±0.3% load regulation; 1.5-V level shift on ISENSE2 rejects common-mode noise from optocoupler feedback path.

Use Scenario: 150 W outdoor LED streetlight driver operating in high-humidity environments with frequent line sags.

IC Role / Device Role / Timing Role: UCC28514DWR regulates boost PFC output to 400 V and controls LLC-resonant PWM stage using SS2 soft-start to avoid lamp flicker during cold start.

Use Value: Programmable soft-start (−10.5 µA) extends startup time to 500 ms, eliminating visible LED flash; 1:2 frequency ratio lowers EMI peaks by 6 dB.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC28514N	Same die, PDIP-20 package; higher thermal resistance (1 W vs. 0.7 W SOIC); no exposed thermal pad.	Preferred for prototyping or low-volume through-hole assembly; unsuitable for high-density SMT layouts or >70°C ambient.	Select UCC28514N only when manual soldering or socket-based validation is required; UCC28514DWR is optimal for production SMT.
UCC28070	Dual-phase CCM PFC controller only; no integrated PWM stage; requires external PWM IC (e.g., UCC2891) and inter-stage sync circuitry.	Used in >1 kW server PSUs where interleaved PFC efficiency outweighs integration benefits; adds design complexity and component count.	Choose UCC28070 + UCC2891 only when >96% PFC efficiency at full load is mandatory; UCC28514DWR offers faster time-to-market for ≤500 W designs.

Compared with UCC28514N, the UCC28514DWR provides superior thermal performance in compact layouts and eliminates through-hole rework risk; compared with UCC28070-based solutions, it reduces bill-of-materials by 32% and eliminates inter-stage timing alignment effort-making it ideal for cost-sensitive, space-constrained 100–500 W AC/DC systems.

Availability

UCC28514DWR is available at Aetrix Electronics and suitable for server power supply front-ends, industrial AC/DC adapters, and medical equipment power systems requiring stable component supply, long-term lifecycle support, and full IEC 61000-3-2 compliance.

Supply support for UCC28514DWR 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 ICs for industrial, automotive, and computing applications.

The UCC28514DWR belongs to TI's UCC2851x family of combination PFC/PWM controllers, designed specifically for cost-optimized, high-efficiency offline power supplies requiring IEC 61000-3-2 harmonic compliance and simplified system-level timing.

FAQ

What is the PFC:PWM frequency ratio supported by the UCC28514DWR?

The UCC28514DWR supports a fixed 1:2 PFC:PWM frequency ratio-meaning the PWM stage operates at twice the frequency of the PFC stage (e.g., 200 kHz PWM with 100 kHz PFC). This ratio is hard-coded in the silicon and cannot be changed externally. It is confirmed in the "AVAILABLE OPTIONS" table of SLUS517C, which lists UCC28514DWR under the "1:2" row alongside UVLO and hysteresis values specific to this variant.

How does the UCC28514DWR implement zero-power detection?

The UCC28514DWR implements zero-power detection by monitoring the VAOUT pin: when VAOUT falls below 0.20–0.50 V (typical 0.33 V), the internal zero-power comparator disables GT1 gate drive. This occurs when PFC output load drops near zero, allowing the device to enter ultra-low-power state while retaining fast wake-up capability-verified in the "Zero Power" section of SLUS517C Electrical Characteristics.

Can the UCC28514DWR be used with discontinuous conduction mode (DCM) PFC?

No-the UCC28514DWR is explicitly designed for average-current-mode control in continuous conduction mode (CCM) PFC operation, as stated in the "PFC Features" list and "DESCRIPTION" section of SLUS517C. Its multiplier architecture, current amplifier, and VAOUT slew-rate enhancement assume CCM behavior; DCM operation is unsupported and not characterized.

What is the purpose of the CT_BUFF pin on the UCC28514DWR?

The CT_BUFF pin on the UCC28514DWR provides an internally buffered version of the PWM oscillator ramp (4 V amplitude, 200 kHz typical), intended for direct connection to ISENSE2 via a single resistor to implement slope compensation in peak-current-mode PWM control. This function is documented in the "TERMINAL FUNCTIONS" and "DETAILED PIN DESCRIPTIONS" sections of SLUS517C.

Does the UCC28514DWR require external components for PFC voltage loop compensation?

Yes-the UCC28514DWR requires external RC networks between VAOUT and GND (for voltage loop) and between CAOUT and MOUT (for current loop) to stabilize both control loops. The "DETAILED PIN DESCRIPTIONS" section specifies that "Connect the voltage compensation components between VAOUT and GND" and "Connect impedance between the MOUT pin and the CAOUT pin to compensate the PFC current control loop"-no internal compensation is provided.

UCC28514DWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Mode:: Average Current

Frequency - Switching:: 200kHz

Current - Startup:: 100 µA

Voltage - Supply:: 9.7V ~ 18V

Operating Temperature:: -40°C ~ 105°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

UCC28514DWR FAQ

1.How can I place an order for UCC28514DWR through Aetrix?

Please submit a Request for Quotation (RFQ) for UCC28514DWR 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 UCC28514DWR reliable?

The price and inventory of UCC28514DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28514DWR is usually 5 days.

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Once your UCC28514DWR 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 UCC28514DWR?

For technical support, including UCC28514DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28514DWR requirements.

6.How does Aetrix verify that UCC28514DWR is sourced from the original manufacturer or authorized distributors?

All UCC28514DWR 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 UCC28514DWR meets industry standards.

7.What is the process for return or replacement of UCC28514DWR?

All UCC28514DWR units undergo pre-shipment inspection (PSI). If there is an issue with UCC28514DWR, 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 UCC28514DWR part is unused and in its original packaging.

Return procedure for UCC28514DWR:

1.Submit a request within 90 days.

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

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