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Texas Instruments UCD3138128PFCR
- Part No.:
- UCD3138128PFCR
- Manufacturer:
- Texas Instruments
- Category:
- Power Supply Controllers, Monitors
- Package:
- 80-TQFP
- Datasheet:
-
UCD3138128PFCR.pdf
- Description:
- IC DGTL PWR CTRLR 80TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,166
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Product details
Overview
UCD3138128PFCR from Texas Instruments is a highly-integrated digital power controller for isolated AC/DC and DC/DC converters, featuring 128 kB program flash, dual-bank firmware update capability, 3 independent PID-based feedback loops, 8 high-resolution DPWM outputs (250 ps pulse width resolution), and support for PFC, phase-shifted full-bridge, LLC, and forward topologies in telecom rectifiers and server PSUs.
For engineers reviewing the UCD3138128PFCR datasheet, UCD3138128PFCR pinout, UCD3138128PFCR application, or UCD3138128PFCR equivalent, this page delivers verified technical context, exact package mapping (80-pin TQFP), validated pin functions, real-world control topology support, and confirmed alternative options - all grounded in TI's SLUSBZ8B datasheet and official product documentation.
Technical Context
The UCD3138128PFCR implements three dedicated Digital Power Peripherals (DPPs), each integrating a 16 MSPS error ADC (configurable 1 mV/LSB), 2-pole/2-zero hardware PID compensator, and matched DPWM pairs with cycle-by-cycle duty matching. Its ARM7TDMI-S core runs at 31.25 MHz and manages real-time system monitoring, communication (2×UART, 2×I²C, 1×SPI, PMBus), and firmware updates without power interruption.
Hardware peripherals include 7 analog comparators with programmable blanking and fault counting, synchronous rectifier soft-on/off control, burst mode for light-load efficiency, primary-side voltage sensing, and current sharing (average & master/slave). The device supports configurable modulation schemes - PWM, phase-shift, and frequency modulation - with automatic smooth transitions between modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Program Flash | 128 kB in four 32 kB banks; enables concurrent execution + programming for zero-downtime field firmware updates |
| DPWM Resolution | 250 ps pulse width, 4 ns frequency/phase resolution; supports precise timing control up to 2 MHz switching |
| Error ADC | Up to 16 MSPS sampling, 1 mV/LSB min resolution, 8× oversampling + hardware averaging for noise immunity |
| Feedback Loops | 3 independent hardware PID loops; each with dedicated EADC, compensator, and DPWM output pair |
| ADC Channels | 15-channel, 12-bit, 267 ksps general-purpose ADC; plus 3 dedicated 16 MSPS EADC channels for control loops |
| Operating Temp | –40°C to +125°C junction temperature; qualified for industrial and telecom power supply environments |
| Package | 80-pin TQFP (12 mm × 12 mm); compatible with standard PCB assembly and thermal management practices |
Pinout & Package
UCD3138128PFCR is housed in an 80-pin TQFP (12.00 mm × 12.00 mm) package with exposed thermal pad. Pin assignments support mixed-signal operation: dual ground planes (AGND/DGND), separate analog/digital supplies (V33A/V33D/V33DIO), 8 DPWM outputs (DPWM0A–DPWM3B), 3 EADC differential inputs (EAP0/EAN0 through EAP2/EAN2), and 4 dedicated fault inputs (FAULT0–FAULT3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DPWM0A / DPWM0B | Dual-phase DPWM output pair | Drives high-side/low-side switches in half-bridge or synchronous rectifier configurations with matched dead-time and phase shift |
| EAP0 / EAN0 | Differential error amplifier input #0 | Accepts isolated voltage feedback signal (e.g., from optocoupler or transformer secondary) for primary-side regulation |
| FAULT0–FAULT3 | External analog fault inputs | Support cycle-by-cycle current limiting, overvoltage, overtemperature, or external shutdown with programmable blanking and latching |
| PMBUS_DATA / PMBUS_CLK | PMBus v1.2 interface | Enables standardized telemetry (VOUT, IOUT, TEMP), configuration, and fault logging in compliant power systems |
| SCI_TX0 / SCI_RX0 | UART channel 0 | Used for debug console, host MCU communication, or bootloader interaction via ASCII command protocol |
Key Features
| Feature | Design Value |
|---|---|
| Dual-bank flash architecture | Enables seamless firmware upgrade: execute from Bank A while programming Bank B, then switch on next reset - no power cycle required |
| Hardware PID + EADC co-processing | Offloads real-time loop computation from ARM core; achieves sub-100 ns control latency with deterministic timing |
| Synchronous rectifier soft control | Eliminates shoot-through risk and reduces MOSFET switching losses by dynamically adjusting gate drive timing based on current polarity |
| Burst mode & ideal diode emulation | Maintains >85% efficiency at <10% load in PFC and LLC stages by gating DPWM and modulating conduction angle |
| Multi-topology configurability | Firmware-selectable control modes: voltage, peak/average current, constant current, constant power - no hardware change needed |
Applications
| Telecom Rectifier | Server PSU PFC Stage |
|---|---|
|
Use Scenario: 3 kW front-end AC/DC conversion in 48 V telecom infrastructure with strict efficiency and transient response requirements. IC Role / Device Role / Timing Role: Primary controller for interleaved boost PFC, managing voltage regulation, current balancing, and THD optimization across two phases. Use Value: Achieves >98% efficiency at 50% load and meets EN 61000-3-2 Class C with adaptive blanking and 16 MSPS current sampling. |
Use Scenario: Active PFC stage in 1U/2U redundant server power supplies operating at 100–240 VAC input. IC Role / Device Role / Timing Role: Implements continuous conduction mode (CCM) boost control with feed-forward line voltage compensation and dynamic line-frequency adaptation. Use Value: Reduces RMS input current distortion by 40% vs. fixed-frequency controllers via variable-frequency modulation and real-time ripple cancellation. |
| Phase-Shifted Full Bridge | LLC Resonant Converter |
|
Use Scenario: Isolated 12 V/200 A output stage in AI accelerator rack PSUs requiring tight cross-regulation and fast load-step response. IC Role / Device Role / Timing Role: Controls Q1–Q4 bridge with programmable leading-edge phase shift, adaptive dead-time, and flux-balancing correction. Use Value: Delivers ±0.5% load regulation from 0–100% step and suppresses transformer saturation via real-time flux integral monitoring. |
Use Scenario: High-density 12 V/300 W output for GPU power delivery with >96% peak efficiency and low EMI signature. IC Role / Device Role / Timing Role: Executes variable-frequency resonant control using primary-side VDS sensing and adaptive frequency sweep during startup and light load. Use Value: Enables zero-voltage switching across 10–100% load range and reduces audible noise by 15 dB(A) via triangular modulation dithering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCD3138A64PFCR | 64 kB flash (2×32 kB banks), same 80-pin TQFP, identical DPWM/EADC specs, but lacks second I²C and SPI interfaces | Suitable for cost-sensitive PFC-only designs where dual-firmware update and extra comms are unnecessary | Select UCD3138A64PFCR when firmware complexity is low and field update frequency is minimal |
| UCC28950PW | Analog phase-shifted PWM controller; no microcontroller, no firmware, fixed-function pins, no PMBus/UART | Targeted at high-volume, fixed-topology PSFB designs where flexibility and telemetry are secondary to BOM cost | Choose UCC28950PW only for legacy analog control migration where digital features are not required |
Compared with UCD3138A64PFCR, the UCD3138128PFCR adds critical field-upgrade capability and expanded communications for telemetry-rich systems; versus UCC28950PW, it trades analog simplicity for full programmability, multi-topology support, and embedded diagnostics - essential for next-gen server and AI power architectures.
Availability
UCD3138128PFCR is available at Aetrix Electronics and suitable for telecom rectifiers, server PSU PFC stages, phase-shifted full-bridge converters, and LLC resonant power supplies requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for UCD3138128PFCR 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 ICs, with decades of leadership in digital power control innovation and industrial-grade reliability.
The UCD3138 product line was designed specifically for high-efficiency, isolated power conversion in datacenter, telecom, and industrial applications - emphasizing firmware flexibility, hardware-accelerated control loops, and robust fault management.
FAQ
What is the flash memory architecture of the UCD3138128PFCR?
The UCD3138128PFCR contains 128 kB of program flash organized into four independent 32 kB banks. This architecture allows simultaneous execution from one bank while programming another, enabling true zero-downtime firmware updates in deployed power supplies - a key feature confirmed in TI's SLUSBZ8B datasheet Section 4 and Product Family Comparison Table.
Does the UCD3138128PFCR support PFC control out of the box?
Yes, the UCD3138128PFCR natively supports single- and dual-phase PFC control via its dedicated EADC channels, hardware PID compensators, and DPWM outputs. Its firmware libraries include optimized PFC algorithms for boost, interleaved boost, and bridgeless topologies - explicitly listed under Applications and Feature descriptions in the official datasheet.
What is the maximum switching frequency supported by the UCD3138128PFCR DPWM outputs?
The UCD3138128PFCR supports DPWM switching frequencies up to 2 MHz, with 4 ns frequency resolution and 250 ps pulse width resolution. This capability is specified in the Features section and Electrical Characteristics table (Section 8.5) of the SLUSBZ8B datasheet and enables high-density LLC and PSFB designs.
How many independent feedback loops can the UCD3138128PFCR manage simultaneously?
The UCD3138128PFCR supports up to three independent, hardware-accelerated feedback loops - each with its own error ADC, 2-pole/2-zero PID compensator, and DPWM output pair. This is a defining feature of the UCD3138 family and is documented in the Features, Description, and Product Feature Overview sections of TI's official datasheet.
Is the UCD3138128PFCR pin-compatible with other UCD3138 variants?
No - the UCD3138128PFCR uses an 80-pin TQFP package, while other variants like UCD3138064 use 40- or 48-pin QFN packages. Even within the 80-pin group (e.g., UCD3138A64PFCR), pinouts are identical per TI's Pin Configuration and Functions table (Section 7), confirming mechanical and electrical compatibility across the 80-pin derivatives.
UCD3138128PFCR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 80-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Digital Power Controller
- Voltage - Input:
- 2.1V
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- 69 mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-TQFP (12x12)
UCD3138128PFCR FAQ
1.How can I place an order for UCD3138128PFCR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCD3138128PFCR 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 UCD3138128PFCR reliable?
The price and inventory of UCD3138128PFCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCD3138128PFCR is usually 5 days.
3.What payment methods are accepted for UCD3138128PFCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCD3138128PFCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCD3138128PFCR?
UCD3138128PFCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCD3138128PFCR 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 UCD3138128PFCR?
For technical support, including UCD3138128PFCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCD3138128PFCR requirements.
6.How does Aetrix verify that UCD3138128PFCR is sourced from the original manufacturer or authorized distributors?
All UCD3138128PFCR 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 UCD3138128PFCR meets industry standards.
7.What is the process for return or replacement of UCD3138128PFCR?
All UCD3138128PFCR units undergo pre-shipment inspection (PSI). If there is an issue with UCD3138128PFCR, 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 UCD3138128PFCR part is unused and in its original packaging.
Return procedure for UCD3138128PFCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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