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Texas Instruments UCC28512DWR
- Part No.:
- UCC28512DWR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC28512DWR.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,293
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Product details
Overview
UCC28512DWR 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 package. It delivers 2-A source / 3-A sink gate drive for both stages, supports 1:1 PFC:PWM frequency ratio, features programmable maximum duty cycle (70–80%), and enables IEC 61000-3-2-compliant AC-DC power supplies for industrial and telecom rectifiers.
For engineers reviewing the UCC28512DWR datasheet, UCC28512DWR pinout, UCC28512DWR application, or UCC28512DWR equivalent, key selection criteria include its UVLO turn-on threshold of 16 V, PWM UVLO2 turn-off at 3.55 V with 3.2-V hysteresis, zero-power detect capability, and dual-gate-driver timing coordination for reduced boost-capacitor ripple.
Technical Context
The UCC28512DWR implements leading-edge modulation for the PFC stage and trailing-edge modulation for the PWM stage to minimize ripple current in the boost output capacitor. Its PFC section uses a three-input linearized multiplier with input voltage feedforward and a transconductance voltage amplifier (gM = 70–130 µS) for fast transient response and accurate power limiting.
The PWM stage provides peak-current-mode control with programmable soft-start via SS2 pin, slope compensation via CT_BUFF ramp output, and a dedicated 1.30-V peak current comparator threshold on ISENSE2. Startup sequencing ensures PWM activation only after PFC output reaches 90% of regulation, and shutdown occurs when PFC output drops to 47% of nominal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC:PWM Frequency Ratio | 1:1 - Enables synchronized switching at identical frequencies (e.g., 200 kHz), simplifying EMI filter design and reducing boost capacitor RMS current. |
| UVLO Turn-On Threshold | 16 V - Ensures reliable startup only after bulk capacitor reaches sufficient voltage, preventing brownout operation during line recovery. |
| PWM UVLO2 Turn-Off Voltage | 3.55 V - Delays PWM shutdown until PFC output falls to 47% of nominal, extending hold-up time during AC dropout. |
| Gate Drive Capability | 2-A source / 3-A sink per output (GT1/GT2) - Directly drives medium-power MOSFETs without external buffers in <1 kW designs. |
| Zero Power Detect Threshold | 0.33 V (falling edge on VAOUT) - Disables PFC gate drive when output load drops near zero, eliminating no-load power consumption. |
| Maximum Duty Cycle Clamp | 75% typical (D_MAX pin) - Prevents transformer saturation in flyback or forward topologies by limiting PWM on-time. |
| Oscillator Accuracy | ±15% total variation (160–240 kHz) - Supports stable regulation across line, load, and temperature without trimming. |
Pinout & Package
UCC28512DWR is housed in a 20-pin SOIC (DW) package with 0.65-mm pitch, rated for −40°C to +105°C operation and optimized for surface-mount assembly in high-density power supplies.
| 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; rise/fall times ≤25 ns into 1-nF load. |
| GT2 (10) | PWM Gate Driver Output | Identical drive strength to GT1; controlled by PWM oscillator and current-sense comparator; suppressed until PFC reaches 90% regulation. |
| VSENSE (3) | PFC Voltage Feedback Input | Inverting input to transconductance amplifier; connects to resistor divider from PFC output; triggers OVP/enable/UVLO2 comparators. |
| VAOUT (1) | PFC Voltage Amplifier Output | Transconductance output (70–130 µS); regulates PFC output; sinks up to 3.3 mA during slew enhancement; disables multiplier below 0.33 V. |
| IAC (18) | PFC Line Voltage Sensing Input | Current input proportional to rectified line voltage; max 500 µA; feeds multiplier with feedforward path via VFF pin. |
| ISENSE2 (8) | PWM Current Sense Input | Peak-current-mode sensing node; 1.30-V threshold; accepts external ramp summation via CT_BUFF for slope compensation. |
| D_MAX (4) | PWM Duty Cycle Clamp Input | Analog voltage input (0.09–0.90 V) linearly sets max duty cycle between 70% and 80%; used to prevent transformer saturation. |
| SS2 (13) | PWM Soft-Start Control | Capacitor-connected node charged by 10.5-µA current source; ramps VERR to control GT2 duty-cycle ramp-up over defined tSS. |
| VREF (20) | Internal Reference Output | 7.5-V ±1.5% precision reference; supplies internal circuitry; delivers >10 mA; bypassed with 0.1–10 µF ceramic capacitor. |
| GND (6) & PWRGND (11) | Analog & Power Ground | Separate ground returns: GND for signal references, PWRGND for GT1/GT2 return paths; must be connected externally via Kelvin trace. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFC + PWM Control | Single-chip solution eliminates inter-stage timing mismatches, reduces BOM count, and guarantees synchronized LEM/TEM operation for minimized boost-capacitor ripple. |
| Programmable PWM Duty Limit | D_MAX pin allows precise clamping of GT2 on-time (70–80%) to prevent core saturation in two-switch forward or flyback converters under overload or startup conditions. |
| Zero-Power Detection | VAOUT-based comparator disables GT1 when output load approaches zero, eliminating standby power draw without auxiliary circuitry. |
| Enhanced Transient Response | Transconductance voltage amplifier with slew-rate enhancement sources/sinks up to 3.3 mA outside linear range, enabling rapid recovery from line/load transients. |
| Two-Stage UVLO with Hysteresis | Dual UVLO thresholds (VCC at 16 V/9.7 V; UVLO2 at 6.75 V/3.55 V) ensure robust startup sequencing and extended hold-up during brownouts. |
Applications
| Industrial AC-DC Rectifiers | Telecom Power Supplies |
|---|---|
Use Scenario: 300–800 W offline power supply feeding isolated DC/DC modules in base station equipment. IC Role / Device Role / Timing Role: UCC28512DWR controls boost PFC stage (GT1) and flyback PWM stage (GT2) with synchronized 1:1 switching, ensuring IEC 61000-3-2 compliance and low THD. Use Value: Reduces boost capacitor RMS current by 30% vs. TEM/TEM schemes, lowering thermal stress and extending capacitor lifetime in high-temperature environments. | Use Scenario: Dual-output (12 V/5 V) front-end converter for optical line terminals with strict hold-up time requirements. IC Role / Device Role / Timing Role: UCC28512DWR manages PFC output regulation and PWM duty cycle while enforcing 47% PFC output dropout threshold to sustain PWM operation during AC dips. Use Value: Extends functional hold-up time by 12 ms compared to fixed-threshold controllers, meeting GR-63-CORE reliability standards. |
| Medical Imaging Power Modules | Server PSU Front-Ends |
Use Scenario: High-efficiency, low-noise 500 W PFC+LLC pre-regulator for X-ray generator subsystems. IC Role / Device Role / Timing Role: UCC28512DWR provides average-current-mode PFC control with input voltage feedforward (VFF) and zero-power detect to eliminate idle dissipation. Use Value: Achieves >98% PFC efficiency at 50% load and <0.5 W no-load input power, satisfying IEC 60601-1 leakage and efficiency mandates. | Use Scenario: 1 kW redundant AC-DC front-end in 1U server chassis with space-constrained layout. IC Role / Device Role / Timing Role: UCC28512DWR integrates dual gate drivers (GT1/GT2), 7.5-V reference (VREF), and soft-start (SS2) to reduce external component count by 11 parts vs. discrete controllers. Use Value: Cuts PCB area by 28% and eliminates timing skew between PFC/PWM stages, improving EMI margin by 4 dBµV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28513DWR | Lower UVLO turn-on (10.2 V) and same 3.55-V PWM UVLO2 turn-off; identical pinout and feature set. | Better suited for wide-input-range supplies (85–265 VAC) requiring earlier startup at low line. | Select UCC28513DWR when designing for universal input with frequent low-line brownouts. |
| UCC28070DWR | Dedicated average-current-mode PFC controller only; no integrated PWM stage; requires external PWM IC and synchronization logic. | Used in higher-power (>1 kW) or multi-rail systems where independent PFC/PWM optimization is required. | Choose UCC28070DWR when scalability, thermal separation, or topology flexibility outweigh integration benefits. |
Compared with UCC28512DWR, UCC28513DWR offers lower startup voltage but identical PFC/PWM coordination, while UCC28070DWR trades integration for design flexibility and higher power handling-making UCC28512DWR optimal for cost-sensitive, space-constrained 300–800 W single-output systems.
Availability
UCC28512DWR is available at Aetrix Electronics and suitable for industrial AC-DC rectifiers, telecom power supplies, and medical imaging power modules requiring stable component supply, long-term lifecycle support, and full traceability.
Supply support for UCC28512DWR 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 high-reliability power conversion ICs.
The UCC2851x product line was engineered specifically for cost-optimized, IEC 61000-3-2-compliant offline power supplies combining PFC and isolated PWM stages in a single chip-targeting telecom, industrial, and medical front-end applications.
FAQ
What is the primary function of the UCC28512DWR in an AC-DC power supply?
The UCC28512DWR serves as a dual-stage controller that simultaneously manages the boost PFC stage (via GT1) and an isolated PWM stage (via GT2) in a single IC. It enforces IEC 61000-3-2 harmonic compliance through average-current-mode PFC control and peak-current-mode PWM regulation, with built-in sequencing, gate drive, and protection features. The UCC28512DWR eliminates the need for separate controllers and external timing coordination circuitry.
How does the UCC28512DWR reduce ripple current in the PFC output capacitor?
The UCC28512DWR reduces PFC output capacitor ripple current by implementing leading-edge modulation (LEM) for the PFC stage and trailing-edge modulation (TEM) for the PWM stage. This phase relationship causes the PWM stage's input current ripple to partially cancel the PFC stage's output ripple. The UCC28512DWR guarantees this timing alignment internally-no external synchronization components are needed-and achieves up to 30% lower RMS ripple versus TEM/TEM schemes.
What is the role of the D_MAX pin on the UCC28512DWR?
The D_MAX pin (Pin 4) on the UCC28512DWR sets the maximum duty cycle limit for the PWM stage (GT2). Applying a dc voltage between 0.09 V and 0.90 V linearly clamps the duty cycle between 70% and 80%. This prevents transformer saturation in flyback or forward topologies during overload, startup, or high-line conditions. The UCC28512DWR uses this analog input-rather than digital registers-to maintain simplicity and robustness in high-noise power environments.
Does the UCC28512DWR support zero-power detection, and how is it implemented?
Yes, the UCC28512DWR implements zero-power detection using the VAOUT pin. When the PFC output voltage collapses and VAOUT falls below 0.33 V (with 40–140 mV hysteresis), the internal zero-power comparator disables GT1, halting PFC switching. This feature eliminates no-load power consumption without requiring auxiliary bias windings or external circuitry. The UCC28512DWR leverages its existing voltage amplifier output-rather than adding dedicated pins-for this function, preserving pin count and layout simplicity.
What are the key differences between UCC28512DWR and UCC28510DWR?
The UCC28512DWR and UCC28510DWR share identical pinout, package, and core architecture but differ in UVLO thresholds: UCC28512DWR has a 16-V turn-on and 3.55-V PWM UVLO2 turn-off with 3.2-V hysteresis, while UCC28510DWR uses 16-V turn-on but 5.30-V PWM UVLO2 turn-off with 1.45-V hysteresis. These differences directly impact hold-up time behavior-UCC28512DWR sustains PWM operation longer during AC dropout, making it preferable for applications requiring extended ride-through.
UCC28512DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
UCC28512DWR FAQ
1.How can I place an order for UCC28512DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28512DWR 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 UCC28512DWR reliable?
The price and inventory of UCC28512DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28512DWR is usually 5 days.
3.What payment methods are accepted for UCC28512DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28512DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28512DWR?
UCC28512DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28512DWR 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 UCC28512DWR?
For technical support, including UCC28512DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28512DWR requirements.
6.How does Aetrix verify that UCC28512DWR is sourced from the original manufacturer or authorized distributors?
All UCC28512DWR 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 UCC28512DWR meets industry standards.
7.What is the process for return or replacement of UCC28512DWR?
All UCC28512DWR units undergo pre-shipment inspection (PSI). If there is an issue with UCC28512DWR, 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 UCC28512DWR part is unused and in its original packaging.
Return procedure for UCC28512DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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