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Texas Instruments UCC28514DW
- Part No.:
- UCC28514DW
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC28514DW.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,142
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Product details
Overview
UCC28514DW from Texas Instruments is a dual-stage combination controller integrating average-current-mode PFC and peak-current-mode PWM control in a single SOIC-20 IC. 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), and enables leading-edge PFC + trailing-edge PWM modulation to minimize boost capacitor ripple. It is designed for IEC 61000-3-2-compliant offline AC/DC power supplies such as server PSUs and industrial SMPS.
For engineers reviewing the UCC28514DW datasheet, UCC28514DW pinout, UCC28514DW application, or UCC28514DW equivalent, key selection criteria include its 1:2 frequency option, programmable PWM duty clamp (70–80%), UVLO2 turn-off at 5.3 V with 1.45 V hysteresis, zero-power detect threshold (0.33 V on VAOUT), and dual high-current gate drivers optimized for CCM boost PFC + flyback PWM topologies.
Technical Context
The UCC28514DW implements a tightly synchronized dual-loop architecture: its PFC section uses average-current-mode control with input voltage feedforward via VFF and a highly linear three-input multiplier, while the PWM stage employs peak-current-mode control with slope compensation support via CT_BUFF and programmable soft-start via SS2. The 1:2 PFC:PWM frequency ratio is hardwired-PFC operates at half the CT_BUFF oscillator frequency, reducing switching loss in the PFC MOSFET without compromising PWM regulation bandwidth.
Startup sequencing is internally managed: PWM remains suppressed until PFC output reaches 90% of regulation, and PWM continues operating until PFC output drops to 71% of nominal-enabling hold-up time extension. Critical analog blocks include a 100 µS transconductance voltage amplifier (VAOUT), a 7.5-V precision reference (VREF), and independent current amplifiers for PFC (CAOUT) and PWM (ISENSE2) with 1.5-V internal level shift for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC:PWM Frequency Ratio | 1:2 - PFC runs at half CT_BUFF frequency (e.g., 100 kHz PFC / 200 kHz PWM), reducing PFC FET conduction loss while maintaining fast PWM transient response. |
| Gate Drive Capability | GT1/GT2 each deliver 2-A source / 3-A sink peak current into 1-nF load, enabling direct drive of medium-power MOSFETs without external buffers. |
| UVLO2 Turn-Off Threshold | 5.3 V with 1.45 V hysteresis - ensures clean PWM shutdown during brownout while preventing chatter near dropout. |
| Maximum PWM Duty Cycle | 70–80% (programmable via D_MAX pin voltage) - supports two-transistor forward and flyback topologies requiring duty cycle limiting. |
| Zero-Power Detect Threshold | 0.33 V on VAOUT (with 90 mV hysteresis) - disables GT1 when PFC output collapses, eliminating no-load power consumption. |
| VREF Output | 7.5 V ±15 mV over temperature - powers external optocoupler circuits and precision resistor dividers with <5 mV load regulation up to 6 mA. |
| PFC Current Sense Offset | ±5 mV on ISENSE1 - ensures accurate average-current-mode control across line/load range with minimal gain error. |
Pinout & Package
UCC28514DW is housed in a 20-pin SOIC (DW) package with 0.65 mm pitch, rated for −40°C to +105°C operation and 0.7 W power dissipation. Thermal pad is not present; PCB layout requires adequate copper area under the package for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GT1 (12) | PFC Gate Driver Output | 2-A source / 3-A sink totem pole drives boost MOSFET; disabled during UVLO or VREF fault. |
| GT2 (10) | PWM Gate Driver Output | Identical drive strength to GT1; enabled only after PFC output reaches 90% of regulation. |
| VSENSE (3) | PFC Voltage Feedback Input | Inverting input to transconductance amplifier; also feeds OVP, ENABLE, and UVLO2 comparators. |
| VAOUT (1) | PFC Voltage Amplifier Output | Transconductance output (70–130 µS) regulating PFC output; sinks 3.3 mA during slew enhancement below 1 V. |
| IAC (18) | Line Voltage Sensing Input | Current input proportional to rectified AC line; max 500 µA; used by multiplier for feedforward compensation. |
| VFF (19) | Voltage Feedforward Output | Sources IAC/2 current; external RC filter generates feedforward voltage (1.4 V at low line, 4.7 V at high line). |
| CAOUT (15) | PFC Current Amplifier Output | Wide-bandwidth op-amp output driving PFC comparator; connected to MOUT for loop compensation. |
| ISENSE2 (8) | PWM Current Sense Input | Peak-current-mode input with 1.5-V internal level shift; 1.3–1.65 V threshold enables noise-immune sensing. |
| SS2 (13) | PWM Soft-Start Control | Capacitor-connected pin charged by 10.5 µA current; controls GT2 ramp-up time and disables GT2 on UVLO2 dropout. |
| D_MAX (4) | PWM Duty Clamp Input | Analog voltage (0.09–0.90 × VREF) sets maximum GT2 duty cycle linearly; clamps at 70–80%. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFC+PWM Control | Single-chip solution eliminates timing skew between stages and reduces BOM count vs. discrete controllers. |
| Leading-Edge PFC + Trailing-Edge PWM | Reduces RMS ripple current in boost output capacitor by >30% vs. TEM/TEM schemes, lowering capacitor stress and size. |
| Programmable PWM Frequency Ratio | Fixed 1:2 ratio (UCC28514DW) allows independent optimization: lower PFC frequency for efficiency, higher PWM frequency for regulation. |
| Zero-Power Detection | Automatically disables GT1 when VAOUT falls below 0.33 V, eliminating standby power draw in no-load conditions. |
| Independent UVLO Stages | VCC UVLO (16 V on / 9.7 V off) and PWM-specific UVLO2 (6.75 V on / 5.3 V off) enable staged startup and graceful shutdown. |
Applications
| Server Power Supply | Industrial AC/DC Adapter |
|---|---|
|
Use Scenario: 80 PLUS Titanium-certified 1 kW PSU with boost PFC front-end and LLC resonant or flyback secondary. IC Role / Device Role / Timing Role: UCC28514DW provides synchronized PFC (100 kHz) and PWM (200 kHz) control, enabling compliance with IEC 61000-3-2 Class A harmonic limits and tight output regulation. Use Value: 1:2 frequency ratio reduces PFC conduction losses while preserving PWM bandwidth for dynamic load steps; zero-power detect cuts no-load consumption to <150 mW. |
Use Scenario: DIN-rail mounted 24 V/48 V industrial power module with wide input range (85–264 VAC) and reinforced isolation. IC Role / Device Role / Timing Role: UCC28514DW manages CCM boost PFC and isolated flyback PWM, with programmable D_MAX limiting duty cycle to prevent transformer saturation at low line. Use Value: Dual UVLO thresholds (VCC and UVLO2) ensure robust startup under brownout and controlled shutdown during line dropout; VFF feedforward maintains PF >0.95 across full input range. |
| Medical Grade SMPS | Telecom Rectifier Module |
|
Use Scenario: 600 W medical AC/DC converter requiring low EMI, high reliability, and 2×MOPP isolation per IEC 60601-1. IC Role / Device Role / Timing Role: UCC28514DW executes average-current PFC and peak-current PWM with leading/trailing edge modulation to suppress common-mode noise in EMI filters. Use Value: CT_BUFF pin provides buffered ramp for precise slope compensation; CAOUT/MOUT loop compensation enables stable 50 kHz–200 kHz crossover in PFC current loop. |
Use Scenario: -48 V telecom rectifier with hot-swap capability and hold-up time >20 ms at full load. IC Role / Device Role / Timing Role: UCC28514DW coordinates PFC and PWM sequencing: PWM stays active until PFC output drops to 71%, extending hold-up time beyond bulk capacitor discharge limit. Use Value: Internal slew rate enhancement on VAOUT enables fast recovery from line dips; SS2-controlled soft-start prevents inrush into downstream DC/DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28515DW | Same 1:2 frequency ratio but lower UVLO turn-on (10.2 V) and reduced UVLO2 hysteresis (0.5 V), suited for low-voltage auxiliary supplies. | Less suitable for universal-input designs requiring 16 V UVLO; better for 12 V bias rail systems with tighter brownout margins. | Select UCC28515DW only if primary VCC supply is regulated ≤12 V and hold-up time requirements permit earlier UVLO2 dropout. |
| UCC28070DW | Dedicated CCM PFC controller (no integrated PWM); requires external PWM IC; higher PFC accuracy (±0.5% VREF) and improved THD performance. | Used in high-efficiency, high-power (>2 kW) systems where PFC and PWM are optimized independently; adds complexity but improves PF and efficiency. | Choose UCC28070DW + separate PWM IC when >98% PFC efficiency or <5% THD is mandatory; UCC28514DW is preferred for cost-sensitive, space-constrained designs. |
Compared with UCC28515DW, UCC28514DW offers higher UVLO margin for universal AC inputs and stronger hold-up behavior; compared with UCC28070DW, it trades PFC precision for integration, reducing component count and layout area at the expense of independent loop tuning.
Availability
UCC28514DW is available at Aetrix Electronics and suitable for server power supplies, industrial AC/DC adapters, medical SMPS, and telecom rectifier modules requiring stable component supply and long-term lifecycle support.
Supply support for UCC28514DW 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, embedded processing, and power management technologies, with decades of expertise in power conversion IC design.
The UCC2851x family was engineered specifically for cost-optimized, IEC 61000-3-2-compliant offline power supplies combining PFC and PWM in one chip-targeting server, industrial, and telecom power systems demanding high integration and reliability.
FAQ
What is the PFC:PWM frequency ratio for UCC28514DW?
The UCC28514DW has a fixed 1:2 PFC:PWM frequency ratio-PFC operates at half the CT_BUFF oscillator frequency (e.g., 100 kHz PFC with 200 kHz PWM). This is confirmed in the "Available Options" table and oscillator section of the SLUS517C datasheet, distinguishing it from UCC28510–UCC28513 (1:1 ratio).
How does UCC28514DW manage startup sequencing between PFC and PWM stages?
UCC28514DW enforces strict sequencing: the PWM stage (GT2) remains disabled until the PFC output voltage reaches 90% of its programmed regulation value. During shutdown, GT2 continues operating until the PFC output drops to 71% of nominal-extending hold-up time beyond the bulk capacitor's natural discharge curve.
What is the function of the VFF pin on UCC28514DW?
The VFF pin on UCC28514DW sources a current equal to half the IAC input current (IAC/2), which flows through an external RC filter to generate a voltage feedforward signal for the PFC multiplier. At low line, VFF is set to ~1.4 V; at high line, it reaches ~4.7 V-enabling near-unity power factor across the full input range.
Can UCC28514DW drive MOSFETs directly without external gate drivers?
Yes-UCC28514DW integrates 2-A source / 3-A sink totem-pole gate drivers on both GT1 (PFC) and GT2 (PWM), capable of directly driving MOSFETs with gate charges up to ~30 nC at 200 kHz. Rise/fall times of 16 ns / 7 ns into 1-nF loads confirm suitability for medium-power discrete FETs in CCM boost and flyback topologies.
What protection features does UCC28514DW include for PFC and PWM stages?
UCC28514DW integrates multiple protections: PFC overvoltage protection (OVP) triggered at VREF + 0.49 V, zero-power detect (VAOUT < 0.33 V), PFC peak current limit (via PKLMT), PWM overcurrent (ISENSE2 threshold 1.3–1.65 V), and dual UVLO (VCC and UVLO2) with configurable hysteresis-ensuring robust fault handling in mission-critical power systems.
UCC28514DW 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:
- 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
UCC28514DW FAQ
1.How can I place an order for UCC28514DW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28514DW 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 UCC28514DW reliable?
The price and inventory of UCC28514DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28514DW is usually 5 days.
3.What payment methods are accepted for UCC28514DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28514DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28514DW?
UCC28514DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28514DW 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 UCC28514DW?
For technical support, including UCC28514DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28514DW requirements.
6.How does Aetrix verify that UCC28514DW is sourced from the original manufacturer or authorized distributors?
All UCC28514DW 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 UCC28514DW meets industry standards.
7.What is the process for return or replacement of UCC28514DW?
All UCC28514DW units undergo pre-shipment inspection (PSI). If there is an issue with UCC28514DW, 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 UCC28514DW part is unused and in its original packaging.
Return procedure for UCC28514DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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