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Texas Instruments UCC28528DWR
- Part No.:
- UCC28528DWR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC28528DWR.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,168
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Product details
Overview
UCC28528DWR from Texas Instruments is a dual-stage PFC/PWM controller IC for off-line AC-DC power supplies, integrating average-current-mode PFC and peak-current-mode PWM control in one 20-pin SOIC package. It delivers 2-A source / 3-A sink gate drive for both stages, supports 1:1 PFC:PWM frequency ratio up to 240 kHz, enables continuous PWM operation during bulk voltage drop, and targets IEC 61000-3-2 compliant auxiliary and standby converters.
For engineers reviewing the UCC28528DWR datasheet, UCC28528DWR pinout, UCC28528DWR application, or UCC28528DWR equivalent, key selection criteria include its trailing-edge modulation scheme, zero-power detect capability, programmable 70–80% maximum PWM duty cycle clamp, UVLO2 turn-off at 5.3 V (not 71% bulk), and dedicated CT_BUFF ramp output for slope compensation.
Technical Context
The UCC28528DWR implements a two-stage control architecture: the PFC section uses average-current-mode control with input voltage feedforward via a highly linear three-input multiplier and transconductance voltage amplifier (gM = 70–130 µS), while the PWM stage employs peak-current-mode control with internal ramp injection (CT_BUFF), programmable soft-start (SS2), and independent UVLO2 (5.3 V turn-off). Both stages share a common oscillator but operate with synchronized trailing-edge modulation.
Unlike the UCC28521, the UCC28528DWR's PWM stage remains active until VCC drops below UVLO threshold - it does not shut down at 71% of nominal bulk voltage. This enables reliable operation in low-power auxiliary supplies where sustained bias is critical. The device integrates dedicated pins for PFC current sensing (ISENSE1), PWM current sensing (ISENSE2), and separate gate drivers (GT1/GT2) with 16-ns rise/7-ns fall times into 1-nF loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC Control Mode | Average-current-mode with input voltage feedforward - ensures near-unity power factor across full line/load range |
| PWM Control Mode | Peak-current-mode with external slope compensation via CT_BUFF - enables stable operation with high duty cycles |
| Max PWM Duty Cycle | 70–80% (programmable via D_MAX pin) - prevents transformer saturation and limits peak stress in flyback/forward topologies |
| Gate Drive Strength | 2-A source / 3-A sink per driver (GT1, GT2) - directly drives MOSFETs up to ~1 nF without external buffers |
| Operating Frequency | 160–240 kHz (PFC & PWM, 1:1 ratio) - balances EMI, efficiency, and magnetics size for <100 W auxiliary supplies |
| UVLO2 Turn-Off Threshold | 5.3 V (fixed, no bulk-voltage dependency) - sustains PWM operation through deep line sags typical in standby mode |
| Zero Power Detect | Active below 0.33 V on VAOUT - disables PFC gate drive when output load falls below ~1% of rated power |
Pinout & Package
UCC28528DWR is housed in a 20-pin SOIC (DW) package with exposed thermal pad (R suffix denotes tape-and-reel packaging). Pin functions are validated per TI SLUS608D datasheet, with strict separation between analog signal (GND), power ground (PWRGND), and high-current gate drive paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GT1 (12) | PFC gate driver output | 2-A source / 3-A sink totem pole - drives boost switch with minimal external components |
| GT2 (10) | PWM gate driver output | Identical drive strength to GT1 - supports flyback/forward primary-side switching |
| VSENSE (3) | PFC voltage feedback input | Inverting input to transconductance amplifier - sets regulated PFC output voltage (e.g., 385 V) |
| ISENSE1 (16) | PFC current sense input | Non-inverting input to current amplifier - senses inductor current for average-current-loop control |
| ISENSE2 (8) | PWM current sense input | Peak-current comparator input with 1.5-V internal level shift - improves noise immunity in isolated feedback designs |
| CT_BUFF (5) | PWM oscillator ramp buffer | 4-V pk-pk buffered ramp - connects directly to ISENSE2 for slope compensation without op-amp buffering |
| D_MAX (4) | PWM max duty clamp input | Analog voltage (0.09–0.90 ratio) - sets hard limit on GT2 on-time to prevent transformer saturation |
| VFF (19) | PFC voltage feedforward input | Sources IAC/2 current - generates feedforward signal across external RC filter to maintain constant power over line variation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFC + PWM control | Eliminates inter-stage timing mismatches and reduces BOM count vs. discrete controllers |
| Trailing-edge PFC/PWM modulation | Enables precise duty-cycle alignment and simplifies EMI filter design vs. leading-edge schemes |
| Programmable PWM soft-start (SS2) | Capacitor-programmed ramp on VERR - prevents inrush current in auxiliary supplies during wake-up |
| Accurate power limiting (IMOUT × VFF) | Hardware-based power clamp - maintains compliance with IEC 61000-3-2 Class D even under line transients |
| Zero power detect (VAOUT < 0.33 V) | Automatic PFC disable below ~1% load - eliminates no-load power consumption in standby mode |
Applications
| Server Auxiliary Power Supply | Telecom Standby Converter |
|---|---|
Use Scenario: Provides regulated 12 V/5 V bias to management controllers and fans during main converter shutdown. IC Role / Device Role / Timing Role: Dual-stage controller managing boost PFC front-end and isolated flyback PWM stage with synchronized trailing-edge modulation. Use Value: Maintains PWM operation down to 5.3 V VCC - ensures uninterrupted auxiliary output during brownouts and hold-up intervals. | Use Scenario: Powers monitoring circuitry and communication interfaces in telecom rectifiers during AC loss. IC Role / Device Role / Timing Role: PFC/PWM controller with zero-power detect enabling automatic shutdown below 1% load. Use Value: Reduces no-load input power to <300 mW - meets Energy Star and ErP Lot 6 standby efficiency requirements. |
| Industrial PLC Power Module | Medical Equipment Backup Supply |
Use Scenario: Delivers isolated 24 V for I/O modules and real-time clocks in programmable logic controllers. IC Role / Device Role / Timing Role: Average-current-mode PFC + peak-current-mode PWM controller with programmable D_MAX clamp. Use Value: 70–80% max duty cycle prevents transformer core saturation during extended low-line operation (85 VAC). | Use Scenario: Supplies critical 5 V/3.3 V rails to microcontrollers and memory during AC failure in diagnostic imaging systems. IC Role / Device Role / Timing Role: Dual-controller IC with independent UVLO2 and fast VAOUT slew rate enhancement. Use Value: 3.3 mA VAOUT slew boost enables rapid recovery from output overloads - maintains regulation during capacitor recharge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC/PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28521DW | PWM stage shuts off at 71% of nominal bulk voltage; lacks continuous low-voltage PWM operation | Designed for main DC-DC converters requiring coordinated PFC/PWM shutdown | Select UCC28521DW only if system requires synchronized PFC/PWM turn-off during brownout - not suitable for auxiliary supplies |
| ICE2PCS01 | Single-chip PFC controller only (no integrated PWM); requires external PWM IC and synchronization circuitry | Used in cost-sensitive designs where PFC and PWM stages are decoupled for flexibility | Choose ICE2PCS01 only when modular control architecture is preferred and board space allows separate PWM controller |
Compared with UCC28521DW and ICE2PCS01, the UCC28528DWR uniquely supports uninterrupted PWM operation during bulk voltage decay and integrates both control loops in one die - reducing component count, layout complexity, and startup timing uncertainty in auxiliary and standby power designs.
Availability
UCC28528DWR is available at Aetrix Electronics and suitable for server auxiliary power supplies, telecom standby converters, industrial PLC power modules, and medical backup supplies requiring stable component supply across long production lifecycles.
Supply support for UCC28528DWR 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 ICs.
The UCC28528DWR belongs to TI's UCC285xx family of combination PFC/PWM controllers, designed specifically for high-efficiency, IEC 61000-3-2-compliant auxiliary and standby power supplies in enterprise and infrastructure equipment.
FAQ
What is the key functional difference between UCC28528DWR and UCC28521DW?
The UCC28528DWR's PWM stage remains active until VCC drops below the UVLO turn-off threshold (5.3 V), whereas the UCC28521DW disables PWM when bulk voltage falls to 71% of nominal. This makes UCC28528DWR suitable for auxiliary/standby supplies needing sustained low-power operation, while UCC28521DW targets main converters requiring coordinated shutdown. Both share identical PFC architecture and pinout.
How does the UCC28528DWR implement zero power detection?
The UCC28528DWR monitors VAOUT voltage: when VAOUT falls below 0.33 V (with 40–140 mV hysteresis), the zero-power detect comparator disables GT1 gate drive. This occurs when PFC output load drops below ~1% of rated power, eliminating no-load losses. The threshold is fixed and internally referenced - no external components are required for basic zero-power functionality.
Can the UCC28528DWR be used in a non-isolated buck-derived topology?
No - the UCC28528DWR is designed exclusively for isolated topologies (e.g., flyback, forward) and boost PFC front-ends. Its PWM stage requires optocoupler feedback via VERR and relies on transformer isolation for safety and regulation. The ISENSE2 input expects a referenced current-sense signal compatible with isolated current transformers or secondary-side sensing - not direct high-side buck switch sensing.
What is the purpose of the CT_BUFF pin on the UCC28528DWR?
The CT_BUFF pin provides a buffered 4-V peak-to-peak oscillator ramp signal synchronized to the PWM stage. It connects directly to ISENSE2 (via a single resistor) to inject slope compensation, stabilizing peak-current-mode control in flyback converters operating above 50% duty cycle. Unlike raw oscillator outputs, CT_BUFF drives 500 µA loads without buffering - simplifying compensation network design.
Does the UCC28528DWR support programmable PFC frequency independent of PWM frequency?
No - the UCC28528DWR enforces a fixed 1:1 PFC:PWM frequency ratio. Both stages derive timing from the same RT-programmed oscillator, with CT_BUFF providing the synchronized ramp for both control loops. Frequency is set by a single resistor on RT (45–500 kΩ for 65–600 kHz), and both PFC and PWM operate at that identical frequency - no independent PFC frequency adjustment is possible.
UCC28528DWR 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
UCC28528DWR FAQ
1.How can I place an order for UCC28528DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28528DWR 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 UCC28528DWR reliable?
The price and inventory of UCC28528DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28528DWR is usually 5 days.
3.What payment methods are accepted for UCC28528DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28528DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28528DWR?
UCC28528DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28528DWR 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 UCC28528DWR?
For technical support, including UCC28528DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28528DWR requirements.
6.How does Aetrix verify that UCC28528DWR is sourced from the original manufacturer or authorized distributors?
All UCC28528DWR 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 UCC28528DWR meets industry standards.
7.What is the process for return or replacement of UCC28528DWR?
All UCC28528DWR units undergo pre-shipment inspection (PSI). If there is an issue with UCC28528DWR, 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 UCC28528DWR part is unused and in its original packaging.
Return procedure for UCC28528DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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