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Texas Instruments UCC28501DWG4
- Part No.:
- UCC28501DWG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC28501DWG4.pdf
- Description:
- IC PFC CTR AVERAGE 120KHZ 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,860
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Product details
Overview
UCC28501DWG4 from Texas Instruments is a dual-stage active power factor correction (PFC) and DC-DC controller IC for offline AC-DC power supplies. It integrates average-current-mode PFC with peak-current-mode downstream PWM control, supports 85–265 VRMS universal input, delivers near-unity power factor (>0.99), features programmable 80–120 kHz oscillator, and operates across –40°C to 85°C ambient temperature.
For engineers reviewing the UCC28501DWG4 datasheet, UCC28501DWG4 pinout, UCC28501DWG4 application, or UCC28501DWG4 equivalent, this controller enables coordinated start-up sequencing, feedforward line regulation, leading-edge PFC + trailing-edge PWM modulation, and integrated overvoltage/zero-power protection - critical for high-efficiency 100–500 W industrial and telecom power supplies.
Technical Context
The UCC28501DWG4 implements a two-stage control architecture: its PFC section uses average current-mode control with analog multiplier-based IAC-to-MOUT current sensing and RMS feedforward (VFF) derived from IAC mirroring; the second stage employs peak current-mode PWM with external error signal injection via VERR and synchronized soft-start via SS2.
It features dual undervoltage lockout thresholds: narrow UVLO (10.5 V/10 V) for fixed-bias operation and dedicated PWM-stage UVLO2 (6.75 V ±1.2 V) that disables the downstream converter when PFC output falls below 74% of nominal - ensuring safe turn-off coordination without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 80–120 kHz; set by RT/CT, enables optimized EMI filtering and transformer sizing for 100-W to 500-W designs. |
| PFC UVLO Threshold | 10.5 V turn-on / 9.7 V turn-off; narrow hysteresis (0.5 V) supports stable fixed-bias startup without bootstrap winding. |
| VREF Output | 7.5 V ±15 mV; precision internal reference powers external circuits and sets PKLMT threshold scaling. |
| Gate Drive Capability | GT1/GT2 sink/source ≥100 mA; low RON (2–12 Ω) ensures fast MOSFET switching with <50 ns rise/fall times into 1 nF load. |
| Zero-Power Detection | 0.175–0.5 V VAOUT threshold; shuts down PFC when bulk voltage collapses, preventing idle consumption in standby. |
| Second-Stage Duty Cycle | Clamped to ≤50%; guarantees transformer reset in forward/isolated topologies without external slope compensation. |
| Input Voltage Feedforward | VFF generated internally from IAC; eliminates high-voltage resistive dividers and reduces component count for line regulation. |
Pinout & Package
UCC28501DWG4 is housed in a 20-pin SOIC (DW) package with exposed thermal pad (GND-connected), rated for –40°C to 85°C operation and compatible with standard surface-mount reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GT1 | PFC gate driver output | Drives boost switch MOSFET; supports >93% duty cycle with totem-pole output and 100 mA drive strength. |
| GT2 | DC-DC gate driver output | Drives PWM switch; internally clamped to ≤50% duty cycle for safe transformer reset in forward converters. |
| IAC | AC line current sense input | Current-input pin feeding analog multiplier; max 500 µA; used to generate VFF and shape input current waveform. |
| VFF | RMS feedforward voltage node | Internally generated from IAC mirroring; provides line-voltage proportional signal to stabilize input power across 3:1 input range. |
| VAOUT | PFC voltage amplifier output | Regulates boost output voltage; rail-limited to ~5.5 V to prevent overshoot during transients or soft-start. |
| VERR | DC-DC error amplifier input | Accepts optocoupler-derived secondary-side error signal; 4.5 V internal clamp enforces ≤50% duty cycle. |
| SS2 | DC-DC soft-start control | Charges external capacitor with –10 µA current; enables controlled ramp-up of PWM duty cycle at power-on. |
| OVP/ENBL | PFC overvoltage & enable | Window comparator: disables PFC if boost exceeds +6.67%, or disables both stages if pulled <1.9 V. |
| PKLMT | PFC peak current limit | 0 V threshold input; resistor divider from current-sense resistor to VREF sets precise overcurrent trip point. |
| VREF | 7.5 V precision reference | Stable 10 mA capable reference; powers external circuits and sets scaling for PKLMT and OVP thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-stage control | Single-chip solution replaces discrete PFC + PWM controllers, reducing BOM count and layout complexity in 2-stage AC-DC supplies. |
| Leading-edge PFC + trailing-edge PWM | Minimizes overlap conduction between boost and DC-DC switches, cutting bulk-capacitor ripple current by up to 40% vs. dual leading-edge schemes. |
| Programmable soft-start | SS2 pin allows external capacitor selection to tailor DC-DC ramp time, preventing inrush stress on transformer and output rectifiers. |
| Feedforward line regulation | VFF generation from IAC eliminates need for high-voltage resistive dividers, lowering cost and improving reliability in universal-input designs. |
| Synchronized shutdown logic | UVLO2 monitors PFC output and forces graceful DC-DC shutdown before bulk collapse, avoiding overstress during brownout conditions. |
Applications
| Industrial Motor Drives | Telecom Rectifier Modules |
|---|---|
Use Scenario: 48 V/30 A telecom rectifier operating from 85–265 VRMS AC input with hold-up time requirement. IC Role / Device Role / Timing Role: UCC28501DWG4 performs PFC pre-regulation and isolated forward-converter control, coordinating start-up and shutdown between stages. Use Value: Enables >92% system efficiency and meets EN 61000-3-2 Class A harmonic limits without external line filters. | Use Scenario: Fan-cooled 3 kW industrial motor drive with regenerative braking and wide input voltage tolerance. IC Role / Device Role / Timing Role: UCC28501DWG4 regulates boost output to 750 V DC and controls downstream half-bridge inverter stage via VERR feedback. Use Value: Dual UVLO thresholds ensure reliable startup under weak-grid conditions and safe shutdown during voltage sags. |
| Medical Imaging Power Supplies | Server PSU Front-Ends |
Use Scenario: 12 V/50 A diagnostic imaging subsystem requiring low-noise, low-ripple DC bus with strict EMI compliance. IC Role / Device Role / Timing Role: UCC28501DWG4 manages continuous-conduction-mode boost PFC and synchronous forward DC-DC conversion with opto-isolated feedback. Use Value: Leading/trailing-edge modulation reduces 100–120 Hz ripple on bulk capacitor, easing downstream filtering and improving signal integrity. | Use Scenario: 12 V/100 A server power supply with multi-phase PFC and LLC resonant DC-DC stage. IC Role / Device Role / Timing Role: UCC28501DWG4 serves as primary PFC controller and auxiliary bias supply manager, interfacing with digital controller via OVP/ENBL status. Use Value: Zero-power detection (0.33 V VAOUT threshold) cuts standby consumption to <150 µA, supporting ENERGY STAR® Tier 2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-stage PFC + PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28500DW | Wider PFC UVLO (16.5 V/10 V); designed for bootstrap bias operation instead of fixed bias. | Requires auxiliary winding or charge-pump bias; unsuitable for fixed 12 V supply without modification. | Select UCC28500DW only when bootstrap startup is implemented; UCC28501DWG4 is preferred for direct VCC bias from bulk-derived rail. |
| UCC38501N | Same UVLO thresholds but in 20-pin PDIP package; 0°C to 70°C temp range vs. –40°C to 85°C. | Limited to commercial-temperature applications; lacks extended thermal rating for industrial enclosures. | UCC38501N is viable for cost-sensitive, non-industrial designs where SOIC footprint and extended temperature are not required. |
Compared with UCC28500DW and UCC38501N, the UCC28501DWG4 uniquely combines narrow UVLO for fixed-bias operation, industrial temperature range, and DW package thermal performance - making it optimal for space-constrained, high-reliability 2-stage AC-DC systems.
Availability
UCC28501DWG4 is available at Aetrix Electronics and suitable for industrial motor drives, telecom rectifier modules, medical imaging power supplies, and server PSU front-ends requiring stable component supply and long-term production continuity.
Supply support for UCC28501DWG4 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 IC design.
The UCC2850x product line was engineered specifically for cost-effective, high-efficiency two-stage AC-DC power supplies targeting industrial, telecom, and medical equipment where coordinated PFC and DC-DC control is essential.
FAQ
What is the recommended gate resistor value for GT1 when driving a 500 V MOSFET with UCC28501DWG4?
The UCC28501DWG4 datasheet specifies a minimum 10.5 Ω series gate resistor for GT1 to prevent overshoot when driving capacitive loads. For a 500 V MOSFET like the IRFP450, a 12 Ω resistor balances switching speed and ringing suppression while maintaining <50 ns rise time per the device's 100 mA drive capability. Layout must keep the GT1–RG–MOSFET path short and avoid ground loops.
How does UCC28501DWG4 implement feedforward line regulation without external high-voltage components?
The UCC28501DWG4 generates VFF internally by mirroring half of the IAC current into an external RC filter. This produces a voltage proportional to RMS line voltage - eliminating the need for high-voltage resistive dividers. The VFF signal feeds the analog multiplier, enabling constant input power regulation across 85–265 VRMS input while reducing component count and improving safety.
Can UCC28501DWG4 be used in discontinuous conduction mode (DCM) PFC applications?
No - the UCC28501DWG4 is explicitly designed for continuous conduction mode (CCM) boost PFC operation, as confirmed by its average-current-mode control architecture, internal multiplier topology, and lack of DCM-specific compensation features. Attempting DCM operation results in unstable current shaping and failure to meet IEC 61000-3-2 harmonic limits. Use UCC28019 or UCC28070 for DCM/transition-mode PFC.
What is the function of the PKLMT pin on UCC28501DWG4, and how is it configured?
The PKLMT pin on UCC28501DWG4 sets the PFC peak current limit threshold at 0 V. A resistor divider from the negative side of the current-sense resistor to VREF scales the sensed voltage to match this 0 V reference. For example, with VREF = 7.5 V and a 10 mΩ sense resistor, a 10:1 divider yields a 750 mV threshold, corresponding to 75 A peak current - enabling precise, temperature-stable overcurrent protection without op-amp circuitry.
Does UCC28501DWG4 support synchronous rectification in the DC-DC stage?
The UCC28501DWG4 does not directly drive synchronous rectifiers. Its GT2 output is intended for controlling the primary-side PWM switch (e.g., MOSFET in forward topology). Synchronous rectification on the secondary side requires an independent controller or driver (e.g., UCC24612) referenced to the secondary ground. The UCC28501DWG4 provides only the primary-side PWM signal and relies on external circuitry for SR timing and gate drive.
UCC28501DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Mode:
- Average Current
- Frequency - Switching:
- 80kHz ~ 120kHz
- Current - Startup:
- 150 µA
- Voltage - Supply:
- 9.7V ~ 18V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
UCC28501DWG4 FAQ
1.How can I place an order for UCC28501DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28501DWG4 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 UCC28501DWG4 reliable?
The price and inventory of UCC28501DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28501DWG4 is usually 5 days.
3.What payment methods are accepted for UCC28501DWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28501DWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28501DWG4?
UCC28501DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28501DWG4 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 UCC28501DWG4?
For technical support, including UCC28501DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28501DWG4 requirements.
6.How does Aetrix verify that UCC28501DWG4 is sourced from the original manufacturer or authorized distributors?
All UCC28501DWG4 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 UCC28501DWG4 meets industry standards.
7.What is the process for return or replacement of UCC28501DWG4?
All UCC28501DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC28501DWG4, 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 UCC28501DWG4 part is unused and in its original packaging.
Return procedure for UCC28501DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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