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Texas Instruments UCC28515N
- Part No.:
- UCC28515N
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
UCC28515N.pdf
- Description:
- IC PFC CTR AV CURR 200KHZ 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,824
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Product details
Overview
UCC28515N from Texas Instruments is a dual-stage combination controller integrating average-current-mode PFC and peak-current-mode PWM control in a single 20-pin PDIP package. It delivers 2-A source / 3-A sink gate drive for both stages, supports 1:2 PFC:PWM frequency ratio (PFC at ~100 kHz, PWM at ~200 kHz), features input voltage feedforward, programmable soft-start, and zero power detect - enabling IEC 61000-3-2 compliant AC/DC front-end designs for industrial and telecom power supplies.
For engineers reviewing the UCC28515N datasheet, UCC28515N pinout, UCC28515N application, or UCC28515N equivalent, key selection criteria include its leading-edge PFC + trailing-edge PWM modulation architecture, dual UVLO thresholds (10.2 V turn-on / 5.3 V turn-off for PWM stage), 7.5-V precision reference, and compatibility with boost PFC + flyback/forward PWM topologies requiring harmonic compliance and high-efficiency staged regulation.
Technical Context
The UCC28515N implements a tightly synchronized dual-loop architecture: the PFC section uses average-current-mode control with a three-input linearized multiplier, transconductance voltage amplifier (gM = 70–130 µS), and input voltage feedforward to achieve near-unity power factor across line/load variations; the PWM stage employs peak-current-mode control with slope compensation via CT_BUFF, programmable D_MAX clamp (70–80% max duty), and independent UVLO2 (6.3 V turn-on, 5.3 V turn-off).
Its oscillator supports fixed 1:2 PFC:PWM frequency ratio (PFC at half PWM frequency), with PWM operating at 160–240 kHz (typ. 200 kHz) and PFC at 80–120 kHz. Startup sequencing enforces PFC output reach ≥90% before PWM enable, and graceful shutdown occurs when PFC output drops to 71% of nominal - ensuring stable bus regulation and preventing cascaded failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC:PWM Frequency Ratio | 1:2 - PFC operates at half PWM frequency (e.g., 100 kHz PFC / 200 kHz PWM), minimizing boost capacitor ripple current via LEM/TEM interleaving. |
| Gate Drive Capability | GT1/GT2: 2-A source / 3-A sink - drives MOSFET gates directly without external buffers in medium-power (≤300 W) applications. |
| UVLO Thresholds | VCC turn-on: 10.2 V; PWM UVLO2 turn-on: 6.3 V, turn-off: 5.3 V - enables staged startup and hold-up during brownout. |
| Reference Voltage | VREF = 7.5 V ±15 mV (over temp) - powers internal circuitry and external divider networks with <5 mV load regulation up to 6 mA. |
| Zero Power Detect | VAOUT threshold: 0.33 V (falling edge) - disables PFC gate drive below standby power, reducing no-load consumption. |
| Maximum Duty Cycle Clamp | D_MAX input sets GT2 clamp: 70–80% - prevents transformer saturation in flyback/forward topologies under overload or low-line conditions. |
| Soft-Start Control | SS2 pin accepts external capacitor; 10.5 µA charge current ramps VERR to 3 V - controls PWM ramp-up time independently of PFC stage. |
Pinout & Package
UCC28515N is housed in a 20-pin plastic dual in-line package (PDIP-N), with separate analog ground (GND) and power ground (PWRGND) pins for noise isolation. Thermal dissipation is rated at 1 W.
| 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 until VCC exits UVLO and VREF is valid. |
| GT2 (10) | PWM Gate Driver Output | Identical drive strength to GT1; enabled only after PFC output reaches 90% of target, disabled when PFC drops to 71%. |
| VSENSE (3) | PFC Voltage Feedback Input | Inverting input to transconductance amplifier; also feeds OVP, ENABLE, and UVLO2 comparators - single point for regulation and protection. |
| VAOUT (1) | PFC Transconductance Amplifier Output | Regulates PFC output voltage; sources/sinks up to 30 µA linearly, up to 3.3 mA during slew enhancement; falls below 0.33 V to trigger zero-power shutdown. |
| IAC (18) | Line Voltage Sensing Input | Current input proportional to rectified AC line; max 500 µA - enables input voltage feedforward for constant power regulation. |
| VFF (19) | Voltage Feedforward Output | Current mirror output (IAC/2); external RC filter generates feedforward voltage - sets multiplier gain scaling across line range. |
| RT (2) | Oscillator Programming Input | Resistor-to-GND sets CT_BUFF frequency (PWM stage); PFC runs at half that frequency - enables precise timing control with one component. |
| SS2 (13) | PWM Soft-Start Input | Capacitor-to-GND sets PWM ramp duration; internal 10.5 µA current charges SS2 to 3 V - decouples PWM startup timing from PFC stabilization. |
Key Features
| Feature | Design Value |
|---|---|
| Leading-edge PFC + trailing-edge PWM modulation | Reduces boost capacitor RMS ripple current by >30% vs. TEM/TEM schemes - lowers capacitor stress and extends lifetime in high-reliability systems. |
| Programmable PWM maximum duty cycle (D_MAX) | Linear 0.09–0.90 V input maps to 70–80% GT2 duty limit - prevents transformer core saturation in two-switch forward or flyback converters under fault conditions. |
| Independent PWM UVLO2 with hysteresis | 6.3 V turn-on / 5.3 V turn-off (1.45 V hysteresis) - maintains PWM operation during brief PFC bus dips while ensuring clean disable on sustained undervoltage. |
| Zero power detect with hysteresis | 0.33 V VAOUT threshold (40–140 mV hysteresis) - shuts down PFC gate drive below standby power, cutting no-load input current to <150 µA. |
| CT_BUFF buffered ramp output | 4-V amplitude, 2-MHz GBW buffer at Pin 5 - allows direct resistor connection to ISENSE2 for accurate slope compensation without external op-amp. |
Applications
| Industrial AC/DC Power Supplies | Telecom Rectifiers |
|---|---|
Use Scenario: 300-W open-frame power supply for PLC controllers, meeting IEC 61000-3-2 Class A harmonic limits. IC Role / Device Role / Timing Role: UCC28515N provides coordinated PFC+PWM control with 1:2 frequency ratio and staged enable/disable sequencing. Use Value: Eliminates need for separate PFC and PWM controllers, reducing BOM count by 2 ICs and PCB area by >15% versus discrete solutions. |
Use Scenario: -48 V telecom rectifier module requiring >90% efficiency and hold-up time >10 ms during AC dropout. IC Role / Device Role / Timing Role: UCC28515N manages boost PFC stage (100 kHz) and forward PWM stage (200 kHz) with independent UVLO2 for robust brownout recovery. Use Value: Programmable D_MAX clamp and 71% PFC shutdown threshold maintain regulated output during 100-ms line sag without secondary overvoltage. |
| Medical Equipment Power Modules | LED Driver Front-Ends |
Use Scenario: IEC 60601-1 compliant 250-W power module for diagnostic imaging equipment with strict EMI and leakage requirements. IC Role / Device Role / Timing Role: UCC28515N executes average-current-mode PFC with input voltage feedforward and peak-current-mode PWM with slope compensation. Use Value: Leading-edge PFC modulation reduces high-frequency common-mode noise, easing Y-cap sizing and meeting CISPR 11 Class B conducted emissions. |
Use Scenario: High-bay LED driver with universal input (90–264 VAC) and constant-power dimming, requiring low THD and high PF. IC Role / Device Role / Timing Role: UCC28515N regulates boost PFC bus and drives LLC resonant half-bridge via PWM stage with soft-start synchronization. Use Value: Zero power detect cuts standby consumption to <0.3 W, and 1:2 frequency ratio minimizes audible noise from magnetics in enclosed luminaires. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28515DW | Same electrical specs and pinout; SOIC-20 package (0.7 W power dissipation vs. 1 W for N-package). | Preferred for automated SMT assembly and higher-density layouts; requires thermal pad design for >250 W operation. | Select UCC28515DW for volume production with reflow capability; choose UCC28515N for prototyping, through-hole assembly, or higher thermal margin. |
| UCC28514N | Identical PDIP-20 package and 1:2 PFC:PWM ratio, but UVLO2 turn-off at 5.3 V (same) with higher hysteresis (1.74 V vs. 1.45 V) and 16 V VCC turn-on. | Better suited for wide-input industrial systems where higher VCC UVLO prevents false turn-on during slow-rising bulk capacitors. | UCC28514N offers enhanced immunity to supply ramp variability; UCC28515N is optimized for faster startup in telecom-grade designs with tight VCC regulation. |
Compared with UCC28515DW, the UCC28515N provides higher thermal headroom (1 W vs. 0.7 W) for manual soldering and lower-volume builds; compared with UCC28514N, it trades slightly reduced UVLO hysteresis for faster VCC turn-on (10.2 V vs. 16 V), improving responsiveness in dynamically loaded systems.
Availability
UCC28515N is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, telecom rectifiers, medical equipment power modules, and LED driver front-ends requiring stable component supply and long-term manufacturing continuity.
Supply support for UCC28515N 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 ICs and energy-efficient system solutions.
The UCC28515N belongs to TI's UCC2851x family of integrated PFC+PWM controllers, designed specifically for cost-sensitive, space-constrained AC/DC power supplies needing IEC 61000-3-2 compliance and staged regulation without external synchronization logic.
FAQ
What is the PFC:PWM frequency ratio supported by the UCC28515N?
The UCC28515N is configured for a fixed 1:2 PFC:PWM frequency ratio - meaning the PWM stage operates at twice the frequency of the PFC stage (e.g., 200 kHz PWM with 100 kHz PFC). This ratio is hardwired in silicon and cannot be changed externally. It is selected to minimize boost capacitor ripple current through leading-edge PFC and trailing-edge PWM interleaving, as confirmed in the device option table and oscillator description.
How does the UCC28515N handle startup sequencing between PFC and PWM stages?
The UCC28515N enforces strict startup sequencing: the PWM stage (GT2) remains disabled until the PFC output voltage reaches ≥90% of its programmed regulation level, as sensed at VSENSE. During shutdown or line dropout, GT2 stays active until the PFC output falls to 71% of nominal. This behavior ensures stable DC bus establishment before downstream conversion and prevents unregulated PWM operation - a core feature documented in the "DESCRIPTION" and "AVAILABLE OPTIONS" sections.
Can the UCC28515N be used with topologies other than boost PFC + flyback PWM?
Yes - while optimized for boost PFC cascaded with flyback or forward PWM, the UCC28515N supports alternative configurations including two-transistor forward, half-bridge, and resonant topologies. Its programmable D_MAX clamp, independent UVLO2, and slope-compensation-ready CT_BUFF output provide flexibility for non-standard implementations, as explicitly stated in the "APPLICATION INFORMATION" section under "selection of controller options".
What is the function of the VFF pin on the UCC28515N?
The VFF (Voltage Feedforward) pin on the UCC28515N outputs a current equal to half the IAC input current (IAC/2), which is then filtered externally to generate a voltage proportional to the square of the rectified line voltage. This signal scales the multiplier gain to maintain constant power regulation across universal AC input ranges (90–264 VAC), directly enabling near-unity power factor in average-current-mode PFC operation per the multiplier transfer function and detailed pin descriptions.
Does the UCC28515N include protection features beyond overvoltage and overcurrent?
Yes - the UCC28515N integrates zero power detect (triggered when VAOUT falls below 0.33 V), undervoltage lockout for both VCC and PWM stages (UVLO2), PFC overvoltage protection (OVP window: VREF + 0.44–0.54 V), and accurate power limiting via the multiplier. These protections are implemented in hardware with defined thresholds and hysteresis, as verified in the "ELECTRICAL CHARACTERISTICS" and "TERMINAL FUNCTIONS" tables - no external components are required for basic fault coverage.
UCC28515N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
UCC28515N FAQ
1.How can I place an order for UCC28515N through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28515N 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 UCC28515N reliable?
The price and inventory of UCC28515N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28515N is usually 5 days.
3.What payment methods are accepted for UCC28515N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28515N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28515N?
UCC28515N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28515N 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 UCC28515N?
For technical support, including UCC28515N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28515N requirements.
6.How does Aetrix verify that UCC28515N is sourced from the original manufacturer or authorized distributors?
All UCC28515N 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 UCC28515N meets industry standards.
7.What is the process for return or replacement of UCC28515N?
All UCC28515N units undergo pre-shipment inspection (PSI). If there is an issue with UCC28515N, 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 UCC28515N part is unused and in its original packaging.
Return procedure for UCC28515N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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