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Texas Instruments UCC28511DWR
- Part No.:
- UCC28511DWR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC28511DWR.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,226
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Product details
Overview
UCC28511DWR from Texas Instruments is a dual-stage combination controller integrating average-current-mode PFC and peak-current-mode PWM in a single SOIC-20 IC. It delivers 1:1 PFC:PWM frequency ratio, 10.2 V UVLO turn-on threshold, 2-A source / 3-A sink gate drivers for both stages, and supports IEC 61000-3-2 harmonic compliance in offline AC-DC power supplies.
For engineers reviewing the UCC28511DWR datasheet, UCC28511DWR pinout, UCC28511DWR application, or UCC28511DWR equivalent, this device enables compact, cost-optimized two-stage power conversion with leading-edge PFC and trailing-edge PWM modulation to minimize boost capacitor ripple current in industrial and telecom power supplies.
Technical Context
The UCC28511DWR implements synchronized dual-loop control: its PFC section uses average-current-mode regulation with input voltage feedforward, a highly linear three-input multiplier, and transconductance voltage amplifier (gM = 100 µS) for fast load transient response; zero-power detect activates below 0.33 V on VAOUT to disable GT1 during standby.
The PWM stage employs peak-current-mode control with programmable maximum duty cycle (70–80%), soft-start via SS2 capacitor, and dual UVLO thresholds (6.75 V turn-on, 5.3 V turn-off). Both GT1 and GT2 drivers deliver 16 ns rise / 7 ns fall times into 1-nF loads, with internal slope compensation support via CT_BUFF ramp output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC:PWM Frequency Ratio | 1:1 - ensures synchronous timing between stages for minimized boost capacitor ripple current |
| VCC UVLO Turn-On Threshold | 10.2 V - enables operation only after sufficient startup bias is established, preventing erratic startup |
| Gate Drive Capability (GT1/GT2) | 2-A source / 3-A sink - directly drives medium-power MOSFETs without external buffers in 100–300 W designs |
| PWM Max Duty Cycle Clamp | 75% typical - prevents transformer saturation in flyback and forward topologies with fixed-frequency operation |
| Reference Voltage (VREF) | 7.5 V ±15 mV - precision internal reference powers external optocoupler feedback and D_MAX divider networks |
| Zero Power Detect Threshold | 0.33 V on VAOUT - shuts down PFC gate drive when output voltage collapses, eliminating no-load power draw |
| Operating Junction Temp | −40°C to +105°C - qualified for industrial ambient conditions without derating in enclosed power systems |
Pinout & Package
UCC28511DWR is housed in a 20-pin SOIC (DW) package with 1.27 mm pitch, thermally optimized for surface-mount assembly and compatible with standard reflow profiles. Pin 11 (PWRGND) and Pin 6 (GND) require separate Kelvin routing to isolate high-current return paths from signal ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GT1 (12) | PFC gate driver output | 2-A source / 3-A sink totem pole drives boost MOSFET; 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 error amplifier inverting input | Connects to output divider; ±120 mV hysteresis enables fast recovery from overvoltage/undervoltage events |
| VAOUT (1) | PFC transconductance amplifier output | Sources/sinks up to 3.3 mA during slew enhancement; drops below 0.33 V to trigger zero-power shutdown |
| IAC (18) | Rectified line voltage current input | Accepts ≤500 µA proportional to instantaneous AC line; feeds multiplier for input voltage feedforward |
| VFF (19) | Voltage feedforward input | Sources IAC/2 current; external RC filter sets feedforward gain to maintain constant power across line range |
| RT (2) | Oscillator programming input | Resistor to GND sets CT_BUFF frequency (160–240 kHz); determines both PFC and PWM switching frequencies |
| SS2 (13) | PWM soft-start input | Capacitor to GND programs controlled ramp of GT2 duty cycle; discharges rapidly on fault or disable |
| PKLMT (14) | PFC peak current limit input | Voltage threshold set to 0 V; resistor divider from VREF defines overcurrent trip point across sense resistor |
| VERR (7) | PWM error amplifier input | Feedback node for optocoupler-based secondary-side regulation; clamped at 3 V to limit max duty cycle |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFC + PWM control | Eliminates inter-stage timing mismatches and reduces BOM count by consolidating two controllers into one SOIC-20 IC |
| Leading-edge PFC + trailing-edge PWM modulation | Reduces RMS ripple current in boost output capacitor by >30% versus dual trailing-edge schemes, lowering capacitor stress and size |
| Programmable PWM maximum duty cycle | D_MAX pin accepts 0.09–0.90 V to linearly set 70–80% clamp-critical for safe operation in two-transistor forward converters |
| Input voltage feedforward implementation | VFF pin sources IAC/2 current; external RC filter enables near-unity power factor across 85–265 VAC input range |
| Zero power detect with hysteresis | Shuts down GT1 when VAOUT falls below 0.33 V (±90 mV hysteresis), cutting standby power to <150 µA |
| High-current gate drivers with fast edge rates | 16 ns rise / 7 ns fall into 1-nF load ensures clean MOSFET switching and minimizes driver-induced EMI in high-frequency designs |
Applications
| Industrial AC-DC Power Supplies | Telecom Rectifier Modules |
|---|---|
|
Use Scenario: 300 W universal-input (85–265 VAC) power supply for PLC controllers and motor drives requiring IEC 61000-3-2 Class A compliance. IC Role / Device Role / Timing Role: UCC28511DWR serves as the master timing and control IC, coordinating PFC boost stage (CCM) and isolated flyback PWM stage with synchronized 1:1 frequency and LEM/TEM modulation. Use Value: Reduces boost capacitor RMS current by 35%, enabling smaller 105°C-rated 470 µF electrolytic instead of 680 µF, saving 220 mm³ board space. |
Use Scenario: 48 V/10 A telecom rectifier module operating from −40°C to +70°C ambient with hold-up time ≥10 ms. IC Role / Device Role / Timing Role: UCC28511DWR manages PFC output regulation at 385 V and controls PWM duty cycle via optocoupler feedback, with UVLO2 hysteresis tuned for stable brownout recovery. Use Value: Programmable soft-start (SS2) limits inrush current to <15 A peak, preventing breaker tripping during hot-swap insertion in distributed power systems. |
| Medical Equipment Power Units | LED Driver Power Stages |
|
Use Scenario: 200 W Class II medical AC-DC adapter certified to IEC 60601-1 with reinforced isolation and low leakage current. IC Role / Device Role / Timing Role: UCC28511DWR provides galvanically isolated feedback via VERR-optocoupler interface while maintaining precise PFC voltage regulation via VAOUT loop stability. Use Value: Zero-power detect disables PFC stage when output load drops below 5 W, reducing no-load consumption to 0.25 W-meeting Energy Star v2.0 requirements. |
Use Scenario: High-efficiency 150 W constant-current LED driver for street lighting with 90–305 VAC input and 36–56 VDC output. IC Role / Device Role / Timing Role: UCC28511DWR regulates PFC output to 400 V and controls PWM stage using primary-side sensing, eliminating secondary-side feedback components. Use Value: Accurate power limiting (via IMOUT × VFF) maintains constant LED power within ±3% across line and temperature, preventing thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28511DW | Same die, identical electrical specs; differs only in packaging-DW is tube, DWR is tape-and-reel (2000 pcs/reel) | No functional difference; DWR preferred for automated SMT production, DW for prototyping or low-volume builds | Select UCC28511DWR for volume manufacturing; UCC28511DW for evaluation or small-batch assembly |
| UCC28070DR | Two-phase interleaved CCM PFC controller only-no integrated PWM stage; requires external PWM IC like UCC28C43 | Supports higher power (>500 W) with lower input current THD but increases component count and layout complexity | Choose UCC28070DR only when >400 W output or <5% THD is required; UCC28511DWR remains optimal for 100–300 W integrated solutions |
Compared with UCC28511DW, the UCC28511DWR offers identical performance with reel-ready packaging for SMT lines; versus UCC28070DR, it trades higher power scalability for lower BOM cost and simpler layout in sub-300 W applications requiring full integration.
Availability
UCC28511DWR is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, telecom rectifier modules, and medical equipment power units requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for UCC28511DWR 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 UCC28511DWR belongs to TI's UCC2851x family of combination PFC/PWM controllers, engineered specifically for cost-sensitive, space-constrained offline power systems needing IEC 61000-3-2 compliance without sacrificing efficiency or reliability.
FAQ
What is the UVLO turn-on threshold for UCC28511DWR?
The UCC28511DWR has a nominal VCC undervoltage lockout (UVLO) turn-on threshold of 10.2 V, with hysteresis of 0.5 V. This ensures reliable startup only after sufficient bias voltage is established, preventing erratic operation during brownout conditions. The UCC28511DWR remains disabled until VCC exceeds 10.2 V, then stays active down to 9.7 V before shutting off.
How does UCC28511DWR implement zero power detection?
The UCC28511DWR monitors VAOUT voltage: when it falls below 0.33 V (with ±90 mV hysteresis), the internal zero-power comparator disables GT1 gate drive. This feature eliminates standby power draw in no-load conditions. In the UCC28511DWR, VAOUT is the output of the PFC transconductance amplifier, making it a direct indicator of PFC output collapse.
Can UCC28511DWR drive both PFC and PWM MOSFETs directly?
Yes, the UCC28511DWR integrates two high-current gate drivers: GT1 (PFC) and GT2 (PWM), each capable of 2-A source and 3-A sink into capacitive loads. Rise/fall times are 16 ns/7 ns into 1-nF, enabling direct drive of MOSFETs up to ~500 pF gate charge in 100–300 W applications without external buffers.
What is the purpose of the CT_BUFF pin on UCC28511DWR?
The CT_BUFF pin on UCC28511DWR provides a buffered version of the internal PWM oscillator ramp (4-V amplitude, 160–240 kHz), used to inject slope compensation into ISENSE2 for stable peak-current-mode control. Its dedicated buffer allows direct connection of a single resistor to ISENSE2, simplifying noise-immune compensation without loading the main oscillator.
Does UCC28511DWR support programmable soft-start for the PWM stage?
Yes, the UCC28511DWR implements PWM soft-start via the SS2 pin: an internal 10.5 µA current source charges an external capacitor to 3 V, ramping VERR and thus GT2 duty cycle from 0% to the D_MAX-clamped maximum. Discharge occurs rapidly during UVLO2 dropout or enable deactivation, ensuring fast fault response in the UCC28511DWR.
UCC28511DWR 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
UCC28511DWR FAQ
1.How can I place an order for UCC28511DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28511DWR 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 UCC28511DWR reliable?
The price and inventory of UCC28511DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28511DWR is usually 5 days.
3.What payment methods are accepted for UCC28511DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28511DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28511DWR?
UCC28511DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28511DWR 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 UCC28511DWR?
For technical support, including UCC28511DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28511DWR requirements.
6.How does Aetrix verify that UCC28511DWR is sourced from the original manufacturer or authorized distributors?
All UCC28511DWR 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 UCC28511DWR meets industry standards.
7.What is the process for return or replacement of UCC28511DWR?
All UCC28511DWR units undergo pre-shipment inspection (PSI). If there is an issue with UCC28511DWR, 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 UCC28511DWR part is unused and in its original packaging.
Return procedure for UCC28511DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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