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Texas Instruments UCC28517DW
- Part No.:
- UCC28517DW
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC28517DW.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
UCC28517DW 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 (PWM at 2× PFC), and enables leading-edge PFC + trailing-edge PWM modulation to minimize boost capacitor ripple. Used in IEC61000-3-2-compliant AC/DC power supplies such as server PSUs and industrial SMPS.
For engineers reviewing the UCC28517DW datasheet, UCC28517DW pinout, UCC28517DW application, or UCC28517DW equivalent, key selection criteria include confirmed 1:2 frequency ratio, UVLO2 turn-off at 3.55 V with 3.2-V hysteresis, programmable D_MAX clamp, zero-power detect, and dual high-current gate drivers-critical for robust PFC+flyback system design.
Technical Context
The UCC28517DW implements a three-input analog multiplier with input voltage feedforward (VFF) and transconductance voltage amplifier (VAOUT) for precise average-current-mode PFC control in continuous conduction mode. Its PFC stage uses CAOUT-driven current loop with zero-power detection below 0.33 V on VAOUT and accurate power limiting via PKLMT.
The PWM stage operates at twice the PFC frequency (e.g., 200 kHz PWM / 100 kHz PFC), features peak-current-mode control with slope compensation via CT_BUFF, programmable soft-start (SS2), and independent UVLO2 (3.55 V turn-off, 3.2 V hysteresis). Sequencing ensures PWM activation only after PFC output reaches 90% of target and continues until PFC drops to 47%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC:PWM Frequency Ratio | 1:2 - PWM stage runs at double the PFC frequency, reducing output capacitor ripple and enabling optimized magnetics sizing. |
| UVLO2 Turn-Off Threshold | 3.55 V - Ensures controlled PWM shutdown during brownout, maintaining PFC regulation longer than 1:1 variants. |
| Gate Drive Strength | 2-A source / 3-A sink per GT1/GT2 - Directly drives MOSFET gates without external buffers in ≤300-W designs. |
| Rise/Fall Time (1 nF) | 16 ns / 7 ns - Enables fast switching transitions, minimizing switching losses in high-frequency PFC and PWM stages. |
| Zero Power Detect Threshold | 0.33 V on VAOUT - Disables PFC gate drive when output load falls near zero, improving light-load efficiency and safety. |
| Maximum Duty Cycle Clamp | Programmable via D_MAX pin (0.09–0.90 V range) - Prevents transformer saturation in flyback or forward topologies. |
| Reference Voltage | 7.5 V ±15 mV - Stable internal reference for precision feedback scaling and resistor-divider programming of thresholds. |
Pinout & Package
UCC28517DW is housed in a 20-pin SOIC (DW) package with 1.27-mm pitch, rated for −40°C to +105°C operation and 0.7 W power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GT1 (12) | PFC gate driver output | 2-A source / 3-A sink totem-pole driver for boost switch; disabled outside UVLO window. |
| GT2 (10) | PWM gate driver output | Identical drive strength to GT1; PWM stage suppressed until PFC output reaches 90% of target. |
| VSENSE (3) | PFC voltage error amplifier inverting input | Feedback node for PFC output regulation; also connects to OVP, ENABLE, and UVLO2 comparators. |
| VAOUT (1) | PFC transconductance amplifier output | Regulates PFC output voltage; sinks/source up to 3.3 mA during slew enhancement; triggers zero-power detect at 0.33 V. |
| IAC (18) | Multiplier line-voltage current input | Accepts rectified AC line current (≤500 µA); feeds analog multiplier with VFF for input voltage feedforward. |
| VFF (19) | Voltage feedforward output | Sources IAC/2 current; external RC filter sets feedforward gain to maintain constant power across line range. |
| PKLMT (14) | PFC peak current limit input | Voltage threshold (0 V reference) for overcurrent protection; programmed via resistor divider from VREF. |
| SS2 (13) | PWM soft-start capacitor node | 10.5-µA internal current charges external cap to ramp VERR and control PWM duty-cycle startup profile. |
| D_MAX (4) | PWM maximum duty cycle clamp | Analog input (0.09–0.90 V) linearly sets GT2 max duty; prevents core saturation in flyback/forward converters. |
| CT_BUFF (5) | Buffered PWM oscillator ramp | 4-V amplitude buffered ramp; directly connects to ISENSE2 for slope compensation in peak-current-mode control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFC+PWM control | Single-chip solution eliminates inter-stage timing mismatches and reduces BOM count vs. discrete controllers. |
| Leading-edge PFC + trailing-edge PWM | Minimizes ripple current in boost output capacitor by 30–50% vs. TEM/TEM schemes, lowering thermal stress. |
| Programmable PWM frequency ratio | Fixed 1:2 ratio (UCC28517DW) allows independent optimization of PFC inductor size and PWM transformer design. |
| Zero-power detect | Automatically disables PFC stage when VAOUT falls below 0.33 V, eliminating no-load power consumption. |
| Independent UVLO2 for PWM stage | 3.55 V turn-off with 3.2 V hysteresis extends PWM operation during line sag while ensuring safe 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: UCC28517DW provides synchronized PFC (100 kHz) and PWM (200 kHz) control with LEM/TEM modulation to meet harmonic limits and reduce EMI filter size. Use Value: Confirmed 1:2 frequency ratio and zero-power detect enable >96% efficiency at 50% load and <0.3 W no-load consumption. | Use Scenario: DIN-rail mounted 24 V/20 A industrial power module with wide-input (85–264 VAC) and hold-up time >20 ms. IC Role / Device Role / Timing Role: UCC28517DW manages PFC output regulation and flyback PWM sequencing, with UVLO2 hysteresis ensuring stable operation during 100-ms line dips. Use Value: Programmable D_MAX clamp and SS2 soft-start prevent transformer saturation and inrush current during cold start. |
| Medical Equipment PSU | Telecom Rectifier Module |
Use Scenario: IEC 60601-1 compliant 48 V/10 A power supply for diagnostic imaging systems requiring low EMI and high reliability. IC Role / Device Role / Timing Role: UCC28517DW executes average-current-mode PFC and peak-current-mode flyback control with built-in OVP, enable, and zero-power detect for fail-safe behavior. Use Value: Dual gate drivers (GT1/GT2) eliminate need for external drivers; 7.5-V VREF enables precision feedback scaling for ±1% output tolerance. | Use Scenario: -48 V telecom rectifier with active PFC and forward converter, operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: UCC28517DW controls boost PFC stage and two-transistor forward PWM, using D_MAX to enforce 75% max duty cycle and prevent core reset failure. Use Value: 1:2 frequency ratio allows smaller PFC inductor and larger PWM transformer window area, improving thermal margin at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28516DW | Same 1:2 PFC:PWM ratio and 3.55 V UVLO2 turn-off, but 6.3 V UVLO2 hysteresis (vs. UCC28517DW's 3.2 V). | Preferred where wider UVLO2 hysteresis improves immunity to noisy 12-V bias rails. | Select UCC28516DW if bias supply has >100 mV ripple; otherwise UCC28517DW offers tighter hysteresis for faster recovery. |
| UCC28070DW | Dual-phase interleaved PFC controller only-no integrated PWM stage; requires separate PWM IC (e.g., UCC2891). | Used in higher-power (>1.5 kW) systems needing lower PFC current ripple and independent PWM optimization. | Choose UCC28070DW + companion PWM only when PFC power exceeds 1.2 kW or interleaving is mandatory for EMI compliance. |
Compared with UCC28516DW, UCC28517DW provides narrower UVLO2 hysteresis (3.2 V vs. 6.3 V) for faster re-enable after brownout, while UCC28070DW lacks integrated PWM entirely-requiring additional layout, timing coordination, and component cost.
Availability
UCC28517DW is available at Aetrix Electronics and suitable for server power supplies, industrial AC/DC adapters, medical equipment PSUs, and telecom rectifier modules requiring stable component supply and long-term lifecycle support.
Supply support for UCC28517DW 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.
The UCC2851x family was designed specifically for cost-sensitive, space-constrained off-line power systems requiring IEC61000-3-2 compliance-targeting AC/DC converters with integrated PFC and isolated PWM stages.
FAQ
What is the PFC:PWM frequency ratio for UCC28517DW?
The UCC28517DW implements a fixed 1:2 PFC:PWM frequency ratio-meaning the PWM stage operates at twice the PFC switching frequency (e.g., 200 kHz PWM with 100 kHz PFC). This is confirmed in the "Available Options" table and oscillator section of the SLUS517C datasheet, distinguishing it from 1:1 variants like UCC28510DW.
How does UCC28517DW handle startup sequencing between PFC and PWM stages?
UCC28517DW enforces strict sequencing: the PWM stage remains suppressed until the PFC output voltage reaches 90% of its regulated value. During shutdown or line dropout, PWM continues operating until the PFC output falls to 47% of nominal-ensuring stable secondary regulation. This behavior is hard-coded and verified in the device description and application diagram.
What is the purpose of the CT_BUFF pin on UCC28517DW?
The CT_BUFF pin on UCC28517DW provides a buffered 4-V amplitude PWM oscillator ramp signal. It is designed to connect directly to the ISENSE2 pin via a single resistor for slope compensation in peak-current-mode PWM control-eliminating need for external op-amps or complex compensation networks.
Does UCC28517DW support zero-power detection, and how is it implemented?
Yes, UCC28517DW includes zero-power detection. It monitors the VAOUT pin: when VAOUT falls below 0.33 V (with 40–140 mV hysteresis), the PFC gate drive (GT1) is automatically disabled. This feature is documented in the "Zero Power" electrical characteristics table and terminal descriptions, reducing no-load power consumption.
What are the UVLO2 thresholds for UCC28517DW, and why do they matter?
UCC28517DW has a PWM-stage UVLO2 turn-off threshold of 3.55 V and hysteresis of 3.2 V. These values ensure the PWM remains active longer during brownouts than 1:1 variants (which use 5.30 V turn-off), preserving output regulation while allowing graceful shutdown-critical for industrial and medical applications with unstable AC inputs.
UCC28517DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
UCC28517DW FAQ
1.How can I place an order for UCC28517DW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28517DW 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 UCC28517DW reliable?
The price and inventory of UCC28517DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28517DW is usually 5 days.
3.What payment methods are accepted for UCC28517DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28517DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28517DW?
UCC28517DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28517DW 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 UCC28517DW?
For technical support, including UCC28517DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28517DW requirements.
6.How does Aetrix verify that UCC28517DW is sourced from the original manufacturer or authorized distributors?
All UCC28517DW 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 UCC28517DW meets industry standards.
7.What is the process for return or replacement of UCC28517DW?
All UCC28517DW units undergo pre-shipment inspection (PSI). If there is an issue with UCC28517DW, 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 UCC28517DW part is unused and in its original packaging.
Return procedure for UCC28517DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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