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Texas Instruments UCC28511N
- Part No.:
- UCC28511N
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
UCC28511N.pdf
- Description:
- IC PFC CTR AV CURR 200KHZ 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,384
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Product details
Overview
UCC28511N from Texas Instruments is a dual-stage combination controller integrating average-current-mode PFC and peak-current-mode PWM in a single 20-pin PDIP package. It delivers leading-edge PFC modulation and trailing-edge PWM modulation at a fixed 1:1 frequency ratio (200 kHz typical), supports 10.2 V UVLO turn-on with 0.5 V hysteresis, provides 2-A source / 3-A sink gate drive on GT1/GT2, and enables IEC 1000-3-2 compliant AC-DC power supplies for industrial and telecom rectifiers.
For engineers reviewing the UCC28511N datasheet, UCC28511N pinout, UCC28511N application, or UCC28511N equivalent, this device serves as a complete control solution for boost PFC + flyback/buck-derived PWM systems requiring harmonic compliance, precise duty-cycle clamping (75% typ.), soft-start sequencing, and zero-power detect functionality - all with verified thermal operation from −40°C to +105°C.
Technical Context
The UCC28511N implements a tightly synchronized dual-loop architecture: its PFC section uses average-current-mode control with input voltage feedforward (via VFF/IAC), a highly linear three-input multiplier, and a transconductance voltage amplifier (gM = 100 µS typ.) for fast load transient response; the PWM section employs peak-current-mode control with programmable soft-start (SS2), accurate maximum duty-cycle clamp (D_MAX input), and slope compensation support via CT_BUFF.
It enforces strict startup sequencing - PWM stage remains suppressed until PFC output reaches 90% of regulation, and shuts down only after PFC output drops to 71% of nominal - while minimizing boost capacitor ripple through LEM/TEM modulation pairing and integrated 2-A/3-A gate drivers with 16-ns rise / 7-ns fall times into 1-nF loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC:PWM Frequency Ratio | 1:1 - ensures synchronous timing between stages for ripple minimization in boost capacitor |
| VCC UVLO Turn-On Threshold | 10.2 V - enables reliable startup under brown-out conditions with low-hysteresis (0.5 V) detection |
| PWM Max Duty Cycle Clamp | 75% typical - prevents transformer saturation in flyback/forward topologies via D_MAX pin voltage scaling |
| Gate Drive Capability (GT1/GT2) | 2-A source / 3-A sink - directly drives MOSFET gates without external buffers in ≤300-W designs |
| Operating Temperature Range | −40°C to +105°C - qualified for industrial and telecom power supply environments |
| Reference Voltage (VREF) | 7.5 V ±15 mV - precision internal reference for feedback dividers and biasing of external circuitry |
| Zero Power Detect Threshold | 0.33 V on VAOUT - disables PFC gate drive when output falls below hold-up threshold, reducing standby loss |
Pinout & Package
UCC28511N is housed in a 20-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and standard through-hole mounting. Thermal dissipation is rated at 1 W, and the package includes separate analog ground (GND) and power ground (PWRGND) pins for noise isolation.
| 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 during UVLO or VREF fault |
| GT2 (10) | PWM gate driver output | Identical drive strength to GT1; enabled only after PFC output reaches 90% of regulation |
| VSENSE (3) | PFC voltage error amplifier inverting input | Feedback node for PFC output regulation; also feeds OVP, ENABLE, and PWM UVLO2 comparators |
| 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) | PFC multiplier current input | Accepts rectified line current (≤500 µA); sets PFC reference magnitude proportional to VAC2 |
| VFF (19) | PFC voltage feedforward input | Sources IAC/2 current; external RC filter generates feedforward signal to maintain constant power across line range |
| SS2 (13) | PWM soft-start timing input | Capacitor-to-ground sets PWM ramp duration; internal 10.5 µA current charges SS2 to 3 V for controlled startup |
| D_MAX (4) | PWM max duty cycle clamp input | 0.09–0.90 V input linearly scales GT2 max duty cycle (70–80%); <0.7 V forces 0% duty |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFC+PWM control | Eliminates inter-stage timing mismatches and reduces BOM count by consolidating two controllers into one IC |
| Leading-edge PFC + trailing-edge PWM modulation | Reduces RMS ripple current in boost capacitor by >30% vs. TEM/TEM schemes, lowering capacitor stress and size |
| Programmable PWM soft-start (SS2) | Enables controlled ramp-up of GT2 duty cycle to prevent inrush current and transformer saturation at startup |
| Accurate power limiting & zero-power detect | Prevents overcurrent during line dips and fully disables PFC stage when AC input is removed, cutting standby loss |
| Separate GND and PWRGND pins | Minimizes switching noise coupling into sensitive analog circuits (e.g., VSENSE, VERR) via dedicated return paths |
Applications
| Industrial AC-DC Rectifiers | Telecom Off-Line Power Supplies |
|---|---|
|
Use Scenario: 300-W universal-input rectifier feeding a 48-V telecom shelf system with strict IEC 61000-3-2 Class A harmonic limits. IC Role / Device Role / Timing Role: UCC28511N controls continuous-conduction-mode boost PFC stage and isolated forward PWM stage, enforcing synchronized LEM/TEM timing to meet harmonic requirements. Use Value: Achieves >0.99 PF across 85–265 VAC input with <5% THD; eliminates need for external PFC+PWM coordination logic or timing ICs. |
Use Scenario: Dual-output (12 V/5 V) power module for base station RF amplifiers requiring high efficiency and hold-up time >10 ms. IC Role / Device Role / Timing Role: UCC28511N regulates PFC bus at 385 V and manages flyback PWM with programmable D_MAX to avoid core saturation during transient load steps. Use Value: Enables 90% full-load efficiency and 12-ms hold-up using single-stage design; zero-power detect cuts no-load consumption to <300 mW. |
| Medical Imaging Power Systems | Server PSU Front-End Modules |
|
Use Scenario: High-reliability 500-W power supply for portable X-ray generator with stringent EMI and thermal derating requirements. IC Role / Device Role / Timing Role: UCC28511N executes PFC voltage loop with transconductance amplifier (gM = 100 µS) and PWM current loop with 1.5-V level-shifted ISENSE2 input for noise immunity. Use Value: Delivers stable 380-V DC bus with <±0.5% regulation; level-shifted sensing rejects common-mode noise from high-dv/dt gate drivers. |
Use Scenario: 80 PLUS Platinum-certified 1.5-kW server PSU front-end using interleaved boost PFC and LLC resonant PWM. IC Role / Device Role / Timing Role: UCC28511N serves as primary PFC controller in master-slave configuration, with GT1 driving one boost leg and sequenced enable for second leg. Use Value: Supports staggered startup and balanced current sharing; UVLO2 hysteresis (1.45 V) ensures clean PWM disable during brown-outs without oscillation. |
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 electrical specs; SOIC-20 package with 0.7 W power dissipation and surface-mount footprint | Preferred for automated assembly and higher-density PCB layouts where thermal margin allows | Select UCC28511DW when board space or reflow compatibility outweighs through-hole mechanical robustness |
| UCC28513N | Identical PDIP-20 package but with 10.2 V UVLO turn-on and 3.2 V PWM UVLO2 hysteresis (vs. 1.45 V in UCC28511N) | Better suited for systems requiring deeper hold-up time during line dropout due to wider PWM disable window | Choose UCC28513N if extended PWM operation during falling PFC bus (down to 3.55 V) is required for critical load retention |
Compared with UCC28511N, UCC28511DW offers identical functionality in a smaller surface-mount package ideal for high-volume production, while UCC28513N provides enhanced hold-up behavior via higher PWM UVLO2 hysteresis - making it preferable for applications demanding longer sustained PWM operation during AC line sag.
Availability
UCC28511N is available at Aetrix Electronics and suitable for industrial AC-DC rectifiers, telecom off-line power supplies, and medical imaging power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for UCC28511N 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 UCC28511N belongs to TI's UCC2851x family of combination PFC/PWM controllers, engineered specifically for cost-sensitive, high-efficiency AC-DC power conversion systems requiring IEC 1000-3-2 compliance and robust thermal performance.
FAQ
What is the UVLO turn-on threshold for UCC28511N?
The UCC28511N features a 10.2 V typical UVLO turn-on threshold with 0.5 V hysteresis, ensuring reliable startup under brown-out conditions while preventing chatter near the threshold. This value is factory-trimmed and specified over temperature; operation below 9.7 V disables all internal circuitry including VREF and gate drivers.
How does UCC28511N implement zero-power detection?
UCC28511N monitors VAOUT voltage: when VAOUT falls below 0.33 V (typical), the internal zero-power detect comparator disables GT1 gate drive, halting PFC operation. This occurs during AC removal or deep brown-out, reducing no-load consumption. The comparator includes 40–140 mV hysteresis to prevent oscillation.
Can UCC28511N drive both PFC and PWM MOSFETs directly?
Yes - UCC28511N integrates two high-current gate drivers: GT1 (PFC) and GT2 (PWM), each capable of 2-A source and 3-A sink into 1-nF loads with 16-ns rise / 7-ns fall times. These drivers eliminate external buffer stages in designs up to ~300 W, provided proper PCB layout and gate resistor selection are used.
What is the function of the CT_BUFF pin on UCC28511N?
CT_BUFF (Pin 5) provides a buffered 4-V amplitude oscillator ramp signal from the PWM stage, intended for direct connection to ISENSE2 via a single resistor to implement slope compensation in peak-current-mode control. Its internal buffer drives ~500 µA, enabling simple, effective compensation without additional op-amps.
Does UCC28511N support programmable maximum duty cycle for the PWM stage?
Yes - UCC28511N accepts a voltage on D_MAX (Pin 4) to set GT2's maximum duty cycle linearly between 70% and 80%. A 0.09–0.90 V input maps to that range; voltages below 0.7 V force 0% duty. This feature is critical for preventing transformer saturation in flyback and forward converters.
UCC28511N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
UCC28511N FAQ
1.How can I place an order for UCC28511N through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28511N 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 UCC28511N reliable?
The price and inventory of UCC28511N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28511N is usually 5 days.
3.What payment methods are accepted for UCC28511N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28511N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28511N?
UCC28511N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28511N 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 UCC28511N?
For technical support, including UCC28511N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28511N requirements.
6.How does Aetrix verify that UCC28511N is sourced from the original manufacturer or authorized distributors?
All UCC28511N 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 UCC28511N meets industry standards.
7.What is the process for return or replacement of UCC28511N?
All UCC28511N units undergo pre-shipment inspection (PSI). If there is an issue with UCC28511N, 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 UCC28511N part is unused and in its original packaging.
Return procedure for UCC28511N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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