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Texas Instruments UCC28515DWR
- Part No.:
- UCC28515DWR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC28515DWR.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,164
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Product details
Overview
UCC28515DWR 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 package. It delivers 2-A source / 3-A sink gate drive for both stages, supports 1:2 PFC:PWM frequency ratio (PWM at 2× PFC), features programmable maximum duty cycle clamp (70–80%), and enables IEC 1000-3-2 compliant AC-DC power supplies up to 300 W.
For engineers reviewing the UCC28515DWR datasheet, UCC28515DWR pinout, UCC28515DWR application, or UCC28515DWR equivalent, this device is selected for high-efficiency boost PFC + flyback/buck-derived isolated DC-DC designs requiring harmonic compliance, precise output regulation, and coordinated leading-edge (PFC) / trailing-edge (PWM) modulation to minimize boost capacitor ripple.
Technical Context
The UCC28515DWR implements a tightly synchronized dual-loop architecture: its PFC section uses average-current-mode control with input voltage feedforward, a highly linear three-input multiplier, and a transconductance voltage amplifier (gM = 70–130 µS) for fast load transient response; zero-power detect activates below 0.33 V on VAOUT to disable GT1.
The PWM stage operates at twice the PFC frequency (e.g., 200 kHz PWM / 100 kHz PFC), employs peak-current-mode control with slope compensation via CT_BUFF, includes programmable soft-start (SS2 charge current = −10.5 µA), and enforces a clamped maximum duty cycle (75% typ.) via D_MAX voltage input - all while maintaining independent UVLO2 turn-off at 5.3 V with 1.45 V hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC:PWM Frequency Ratio | 1:2 - PWM stage runs at double the PFC switching frequency, reducing boost capacitor RMS current and enabling smaller bulk capacitance. |
| Gate Drive Capability | GT1/GT2: 2-A source / 3-A sink - drives MOSFET gates directly without external buffers in ≤300-W designs. |
| Maximum Duty Cycle Clamp | 75% typical (D_MAX = 4.15 V) - prevents transformer saturation in flyback/forward topologies under line surge or light-load conditions. |
| UVLO2 Turn-Off Threshold | 5.3 V with 1.45 V hysteresis - ensures clean PWM shutdown during brownout while retaining PFC operation down to 71% of nominal output. |
| Transconductance Voltage Amplifier (gM) | 70–130 µS - provides high loop gain for tight PFC output voltage regulation (±1%) across line/load variations. |
| Zero Power Detect Threshold | 0.33 V on VAOUT (falling edge) - disables PFC gate drive when output collapses, eliminating no-load consumption. |
| Oscillator Accuracy | ±15% total variation (160–240 kHz) - supports stable timing over temperature and supply voltage (10.8–15 V). |
Pinout & Package
UCC28515DWR is housed in a 20-pin SOIC (DW) package with exposed thermal pad (standard DW footprint), rated for −40°C to +105°C operation and optimized for surface-mount assembly in compact AC-DC power supplies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GT1 (12) | PFC Gate Driver Output | 2-A source / 3-A sink totem pole - directly drives boost MOSFET gate; disabled if VCC < UVLO threshold. |
| GT2 (10) | PWM Gate Driver Output | Identical drive strength to GT1 - controls flyback/forward primary switch; enabled only after PFC output reaches 90% of setpoint. |
| VSENSE (3) | PFC Voltage Feedback Input | Inverting input to transconductance amplifier - sets regulated PFC output voltage (e.g., 385 V) via resistor divider from bulk cap. |
| VERR (7) | PWM Error Amplifier Input | Feedback node for optocoupler-coupled secondary regulation - controls GT2 duty cycle; clamped to 3 V max. |
| D_MAX (4) | PWM Duty Cycle Clamp Input | Analog voltage (0.09–0.90 × VREF) sets hard upper limit on GT2 on-time - critical for transformer safety in flyback designs. |
| CAOUT (15) | PFC Current Amplifier Output | Drives PFC PWM comparator - connects externally to MOUT for current loop compensation; swing range: GND to >5 V. |
| CT_BUFF (5) | PWM Oscillator Ramp Buffer | 4-V pk-pk buffered ramp - used to inject slope compensation into ISENSE2, preventing subharmonic oscillation at >50% duty. |
| VFF (19) | PFC Voltage Feedforward Input | Sources IAC/2 current - forms R/C filter to generate feedforward signal that maintains constant power across universal AC input (85–265 VAC). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFC + PWM Control | Single-chip solution eliminates inter-stage timing mismatches, reduces BOM count by ≥3 ICs, and guarantees LEM/TEM synchronization for minimal boost capacitor ripple. |
| Programmable PWM Frequency Ratio | Fixed 1:2 PFC:PWM ratio - enables higher PWM switching frequency for smaller magnetics while keeping PFC frequency low for EMI filtering efficiency. |
| Leading-Edge PFC / Trailing-Edge PWM Modulation | Reduces RMS current in boost output capacitor by up to 30% vs. TEM/TEM schemes - lowers capacitor temperature and extends lifetime. |
| Accurate Zero-Power Detection | VAOUT < 0.33 V triggers automatic GT1 disable - eliminates standby power draw without auxiliary circuitry or external controllers. |
| Independent Dual UVLO | VCC UVLO (10.2 V on / 9.7 V off) and PWM-specific UVLO2 (6.75 V on / 5.3 V off) allow staged startup/shutdown - PFC remains active during brief line sags. |
Applications
| Server Power Supply | Industrial AC-DC Adapter |
|---|---|
|
Use Scenario: 300-W open-frame PSU for rack-mounted servers complying with IEC 61000-3-2 Class A. IC Role / Device Role / Timing Role: UCC28515DWR serves as the master controller coordinating boost PFC and forward-converter PWM stages with fixed 1:2 frequency ratio and LEM/TEM alignment. Use Value: Reduces boost capacitor RMS current by 28%, enabling 105°C-rated 1000-µF electrolytic instead of 1500-µF, cutting board area by 12%. |
Use Scenario: 200-W sealed industrial adapter powering PLC I/O modules in harsh environments. IC Role / Device Role / Timing Role: UCC28515DWR manages universal-input (85–265 VAC) PFC followed by isolated flyback PWM with reinforced insulation. Use Value: Programmable D_MAX clamp (75% typ.) prevents transformer core saturation during 110% line surges, eliminating need for derating. |
| Medical Imaging Power Module | LED Driver Power Supply |
|
Use Scenario: Low-noise 250-W power module for ultrasound imaging equipment requiring low EMI and high reliability. IC Role / Device Role / Timing Role: UCC28515DWR implements feedforward-stabilized PFC and slope-compensated peak-current PWM to suppress conducted noise. Use Value: CT_BUFF ramp injection into ISENSE2 ensures stable 200-kHz PWM operation at 65% duty, meeting CISPR 11 Class B limits without extra filters. |
Use Scenario: Constant-voltage LED driver for outdoor signage operating across −30°C to +70°C ambient. IC Role / Device Role / Timing Role: UCC28515DWR controls boost PFC and quasi-resonant flyback PWM with adaptive soft-start (SS2). Use Value: VAOUT slew enhancement (3.3 mA peak) recovers PFC output in <10 ms after cold-start, ensuring rapid LED illumination without flicker. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28514DWR | Same 1:2 PFC:PWM ratio and DW package, but UVLO2 turn-off at 5.3 V with 1.45 V hysteresis - identical to UCC28515DWR; differs only in UVLO turn-on (16 V vs. 10.2 V). | Preferred for high-line-only (230 VAC) systems where higher UVLO turn-on avoids nuisance tripping during generator start-up transients. | Select UCC28514DWR when input is stabilized 230 VAC ±10%; UCC28515DWR suits universal-input (85–265 VAC) with tighter brownout tolerance. |
| ICE2PCS01 | Fixed 1:1 PFC:PWM ratio, no D_MAX clamp, lower gate drive (1.2-A sink), and no zero-power detect - lacks key UCC28515DWR safety and efficiency features. | Suitable for cost-sensitive consumer adapters (<150 W) without strict harmonic or standby power requirements. | Choose ICE2PCS01 only for non-IEC-compliant, low-cost applications; UCC28515DWR is required for full Class C compliance and <150-mW no-load power. |
Compared with UCC28514DWR, UCC28515DWR offers superior brownout resilience due to its 10.2-V UVLO turn-on, while versus ICE2PCS01 it delivers measurable system-level advantages: 30% lower boost capacitor stress, 45% reduction in no-load power, and guaranteed IEC 61000-3-2 Class C compliance without auxiliary circuitry.
Availability
UCC28515DWR is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC adapters, and medical imaging power modules requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for UCC28515DWR 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 UCC28515DWR belongs to TI's UCC2851x family of integrated PFC/PWM controllers, engineered specifically for high-efficiency, IEC 1000-3-2 compliant offline power supplies using boost PFC cascaded with isolated flyback or forward converters.
FAQ
What is the PFC:PWM frequency ratio supported by the UCC28515DWR?
The UCC28515DWR is configured for 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 ratio is factory-set and cannot be changed. It is explicitly defined in the "Available Options" table of the SLUS517C datasheet for UCC28515 variants, distinguishing them from UCC28510–UCC28513 (1:1 ratio).
How does the UCC28515DWR implement zero-power detection?
The UCC28515DWR monitors the VAOUT pin voltage: when VAOUT falls below 0.33 V (with 40–140 mV hysteresis), the internal zero-power detect comparator disables GT1 gate drive. This occurs when PFC output voltage collapses, eliminating standby current draw. The feature is intrinsic to the UCC28515DWR's transconductance amplifier architecture and requires no external components.
What is the purpose of the CT_BUFF pin on the UCC28515DWR?
The CT_BUFF pin (Pin 5) provides a buffered 4-V peak-to-peak oscillator ramp signal from the PWM stage. Its primary design purpose is to inject slope compensation into the ISENSE2 pin via an external resistor, preventing subharmonic oscillation in peak-current-mode PWM operation at duty cycles above 50%. This is essential for stable 200-kHz flyback operation.
Can the UCC28515DWR be used in a discontinuous conduction mode (DCM) PFC design?
No - the UCC28515DWR is specifically designed for average-current-mode control in continuous conduction mode (CCM) PFC operation. Its multiplier architecture, current amplifier, and feedback structure assume CCM behavior. DCM PFC requires different control laws and is not supported; TI recommends UCC28070 or UCC28064 for DCM/CRM applications.
What is the maximum gate drive current capability of the UCC28515DWR?
The UCC28515DWR provides 2-A peak source and 3-A peak sink current on both GT1 (PFC) and GT2 (PWM) outputs. These values are specified in the Absolute Maximum Ratings and Electrical Characteristics tables of SLUS517C. The drive strength is sufficient to directly switch 500-V, 25-mΩ MOSFETs in ≤300-W applications without external buffers.
UCC28515DWR 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
UCC28515DWR FAQ
1.How can I place an order for UCC28515DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28515DWR 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 UCC28515DWR reliable?
The price and inventory of UCC28515DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28515DWR is usually 5 days.
3.What payment methods are accepted for UCC28515DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28515DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28515DWR?
UCC28515DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28515DWR 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 UCC28515DWR?
For technical support, including UCC28515DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28515DWR requirements.
6.How does Aetrix verify that UCC28515DWR is sourced from the original manufacturer or authorized distributors?
All UCC28515DWR 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 UCC28515DWR meets industry standards.
7.What is the process for return or replacement of UCC28515DWR?
All UCC28515DWR units undergo pre-shipment inspection (PSI). If there is an issue with UCC28515DWR, 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 UCC28515DWR part is unused and in its original packaging.
Return procedure for UCC28515DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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