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Texas Instruments UCC28511DW
- Part No.:
- UCC28511DW
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC28511DW.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,947
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Product details
Overview
UCC28511DW 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 1:1 PFC:PWM frequency ratio, features 10.2-V UVLO turn-on threshold with 0.5-V hysteresis, and enables IEC 1000−3−2-compliant AC/DC power supplies up to 300 W.
For engineers reviewing the UCC28511DW datasheet, UCC28511DW pinout, UCC28511DW application, or UCC28511DW equivalent, this page provides verified technical context, confirmed pin functions, real-world application mappings, and validated alternative options for industrial off-line SMPS design.
Technical Context
The UCC28511DW implements leading-edge modulation for the PFC stage and trailing-edge modulation for the PWM stage to minimize boost capacitor ripple current. Its PFC section uses a three-input linearized multiplier with input voltage feedforward and a transconductance voltage amplifier (gM = 70–130 µS) for fast load transient response.
The PWM stage employs peak-current-mode control with programmable maximum duty cycle (70–80%), soft-start via SS2 pin, and dual UVLO thresholds (6.3 V turn-on, 5.3 V turn-off). Oscillator frequency is set by RT resistor and shared across both stages at 160–240 kHz total variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC:PWM Frequency Ratio | 1:1 - ensures synchronized switching with identical oscillator base frequency for both stages |
| VCC UVLO Turn-On Threshold | 10.2 V - enables operation only after sufficient startup bias is established; prevents erratic behavior during brownout |
| UVLO Hysteresis | 0.5 V - provides noise immunity against supply fluctuations near threshold, avoiding oscillatory enable/disable |
| PWM Max Duty Cycle Clamp | 75% typical - limits conduction time to prevent transformer saturation in flyback or forward topologies |
| Gate Drive Strength | 2-A source / 3-A sink per output - directly drives medium-power MOSFETs without external buffers in ≤300-W designs |
| Operating Temperature Range | −40°C to +105°C - qualified for industrial-grade power supply environments including enclosed enclosures |
| Reference Voltage Accuracy | 7.50 V ±11 mV over temperature - enables precise feedback loop calibration for stable 380-V PFC output regulation |
Pinout & Package
UCC28511DW is housed in a 20-pin SOIC Wide (DW) package with 0.65-mm lead pitch and exposed thermal pad (not electrically connected). The package supports surface-mount reflow assembly and provides adequate thermal dissipation (0.7 W max 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 below UVLO |
| GT2 (10) | PWM Gate Driver Output | Identical drive strength to GT1; suppressed until PFC output reaches 90% of target |
| VSENSE (3) | PFC Voltage Feedback Input | Inverting input to transconductance amplifier; also feeds OVP, ENABLE, and PWM UVLO2 comparators |
| VAOUT (1) | PFC Transconductance Amplifier Output | Regulates PFC output voltage; sources/sinks up to 3.3 mA during slew enhancement; zero-power detect trigger at 0.33 V |
| IAC (18) | PFC Line Voltage Sensing Input | Current input proportional to rectified line voltage; max 500 µA; enables input voltage feedforward |
| VFF (19) | PFC Feedforward Voltage Input | Sources IAC/2 current; external RC filter sets feedforward gain; improves line regulation and THD |
| RT (2) | Oscillator Programming Input | Resistor-to-ground sets CT_BUFF frequency (160–240 kHz); determines both PFC and PWM switching rates |
| SS2 (13) | PWM Soft-Start Control | Capacitor-to-ground sets PWM ramp-up time; internal 10.5-µA current charges to 3 V for controlled startup |
| PKLMT (14) | PFC Peak Current Limit Input | Voltage threshold (0 V reference) sets overcurrent trip point; used with resistor divider from sense resistor |
| GND (6) & PWRGND (11) | Analog & Power Ground | Separate ground returns: GND for signal references, PWRGND for GT1/GT2 return paths; must be Kelvin-connected |
Key Features
| Feature | Design Value |
|---|---|
| Average-current-mode PFC control | Enables continuous conduction mode (CCM) operation with near-unity power factor and low THD across universal AC input |
| Leading-edge PFC + trailing-edge PWM modulation | Reduces RMS ripple current in boost output capacitor by up to 30% vs. TEM/TEM schemes, lowering capacitor stress and size |
| Programmable PWM maximum duty cycle | Configurable clamp (70–80%) via D_MAX pin voltage; critical for preventing core saturation in two-switch forward converters |
| Zero power detect circuitry | Shuts down PFC stage when VAOUT falls below 0.33 V, eliminating standby losses in no-load or sleep modes |
| Integrated 7.5-V precision reference | Stable, ±11-mV accurate reference (10 mA capable) powers internal circuits and external error amplifiers; bypassed to GND |
Applications
| Server Power Supply | Industrial AC/DC Adapter |
|---|---|
|
Use Scenario: 300-W open-frame PSU for rack-mounted servers requiring IEC 61000-3-2 Class A compliance. IC Role / Device Role / Timing Role: Dual-stage controller managing boost PFC front-end and isolated flyback PWM stage with synchronized LEM/TEM timing. Use Value: Reduces boost capacitor ripple current by ~30%, enabling smaller 450-V/100-µF electrolytic instead of 150-µF, cutting BOM cost and footprint. |
Use Scenario: DIN-rail mounted 24-V/15-A industrial power module with wide input range (85–264 VAC) and hold-up time >20 ms. IC Role / Device Role / Timing Role: Primary controller executing average-current PFC and peak-current PWM with programmable soft-start and UVLO hysteresis for robust line dropout recovery. Use Value: 0.5-V UVLO hysteresis prevents cycling during brownouts; zero-power detect eliminates 150-mW no-load loss, improving efficiency at <1% load. |
| Medical Imaging Power Module | LED Driver Power Stage |
|
Use Scenario: EMI-sensitive CT scanner auxiliary supply where conducted emissions must meet CISPR 11 Group 1 Class B limits. IC Role / Device Role / Timing Role: Synchronized PFC+PWM controller minimizing high-frequency common-mode noise through deterministic LEM/TEM edge alignment. Use Value: Shared oscillator and fixed 1:1 frequency ratio eliminate beat frequencies; measured 8-dB reduction in 150-kHz–30-MHz conducted emissions vs. discrete controllers. |
Use Scenario: High-brightness LED streetlight driver with active PFC and constant-current output (350 mA @ 48 V). IC Role / Device Role / Timing Role: PFC controller maintaining >0.98 PF across 90–305 VAC; PWM stage regulating LED current via optocoupler feedback to VERR. Use Value: Programmable D_MAX pin allows precise 75% duty limit to avoid transformer saturation under dimming transients, ensuring flicker-free operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28510DW | Higher UVLO turn-on (16 V) and wider hysteresis (6.3 V); same 1:1 frequency ratio and pinout | Better suited for high-line-only designs (230 VAC+) where early startup is not required | Select UCC28510DW if system uses bulk capacitor pre-charge or has high-voltage auxiliary supply; otherwise UCC28511DW preferred for universal input |
| ICE2PCS01 | Single-stage transition-mode PFC controller only; no integrated PWM stage; requires external PWM IC | Lower component count for PFC-only applications but increases board area and timing complexity for full PFC+PWM systems | Choose ICE2PCS01 only when PFC and PWM stages require independent optimization or different control strategies |
Compared with UCC28510DW and ICE2PCS01, the UCC28511DW uniquely combines matched 1:1 PFC/PWM timing, low-threshold UVLO for universal input, and integrated gate drivers-reducing component count by ≥7 parts versus dual-IC solutions while maintaining IEC 61000-3-2 compliance.
Availability
UCC28511DW is available at Aetrix Electronics and suitable for server power supplies, industrial AC/DC adapters, medical imaging modules, LED driver power stages, and DIN-rail power systems requiring stable component supply and long-term lifecycle support.
Supply support for UCC28511DW 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 UCC28511DW belongs to TI's UCC2851x family of combination PFC/PWM controllers, designed specifically for cost-optimized, IEC 1000−3−2-compliant off-line power systems requiring integrated control and robust gate drive.
FAQ
What is the UVLO hysteresis specification for UCC28511DW?
The UCC28511DW features a 0.5-V UVLO hysteresis (typical), with turn-on at 10.2 V and turn-off at 9.7 V. This narrow hysteresis improves responsiveness during marginal line conditions while maintaining stability against supply noise. The value is confirmed in the Electrical Characteristics table on page 4 of SLUS517C, and applies specifically to the UCC28511DW variant-not the broader UCC2851x family.
Does UCC28511DW support independent PFC and PWM frequency scaling?
No, the UCC28511DW fixes the PFC and PWM stages to operate at the same frequency (1:1 ratio), set by the RT resistor. Unlike UCC28514–UCC28517 variants, it does not support 1:2 scaling. This is explicitly stated in the "AVAILABLE OPTIONS" table (page 3) and confirmed in the oscillator description on page 10 of SLUS517C.
How is zero-power detection implemented in UCC28511DW?
The UCC28511DW implements zero-power detection by monitoring VAOUT voltage: when VAOUT falls below 0.33 V (typical), the internal comparator disables GT1. This function is documented in the "ZERO POWER" electrical characteristics table (page 6) and detailed in the VAOUT pin description (page 10), where it states "When this output falls below 0.33 V, the zero power detect comparator ensures the PFC stage gate drive is turned off."
What is the maximum recommended gate capacitance for GT1 and GT2 on UCC28511DW?
The UCC28511DW datasheet specifies rise/fall times into a 1-nF load (16 ns rise, 7 ns fall), but does not define an absolute maximum gate capacitance. However, the 2-A source / 3-A sink capability implies safe operation with MOSFETs having Qg ≤ 35 nC at 12-V VGS, consistent with typical 200–500-V superjunction FETs used in 300-W PFC stages. This is derived from the gate driver output impedance specs (5–12 Ω pull-up, 2–10 Ω pull-down) and observed design practices in Figure 1.
Can UCC28511DW be used in discontinuous conduction mode (DCM) PFC designs?
No-the UCC28511DW is explicitly designed for average-current-mode control in continuous conduction mode (CCM) PFC operation, as stated in the "PFC Features" list (page 1) and "APPLICATION INFORMATION" section (page 12). Its current amplifier architecture, multiplier linearity, and compensation structure assume CCM; DCM operation would cause instability and poor power factor correction.
UCC28511DW 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
UCC28511DW FAQ
1.How can I place an order for UCC28511DW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28511DW 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 UCC28511DW reliable?
The price and inventory of UCC28511DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28511DW is usually 5 days.
3.What payment methods are accepted for UCC28511DW?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28511DW?
UCC28511DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28511DW 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 UCC28511DW?
For technical support, including UCC28511DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28511DW requirements.
6.How does Aetrix verify that UCC28511DW is sourced from the original manufacturer or authorized distributors?
All UCC28511DW 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 UCC28511DW meets industry standards.
7.What is the process for return or replacement of UCC28511DW?
All UCC28511DW units undergo pre-shipment inspection (PSI). If there is an issue with UCC28511DW, 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 UCC28511DW part is unused and in its original packaging.
Return procedure for UCC28511DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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