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Texas Instruments UCC2839D
- Part No.:
- UCC2839D
- Manufacturer:
- Texas Instruments
- Category:
- Power Supply Controllers, Monitors
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC2839D.pdf
- Description:
- IC SECONDARY SIDE CTRLR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,627
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Product details
Overview
UCC2839D from Texas Instruments is a secondary-side average current mode controller IC for isolated DC/DC power supplies, featuring a fixed-gain differential current sense amplifier (gain = 8 V/V), 5V precision reference (±1% over temperature), and high-current Gm LED driver (up to 11 mA) optimized for opto-coupler interfacing in feedback loops. It operates across –40°C to +85°C and supports short-circuit protected regulation via dual-loop voltage/current control.
For engineers reviewing the UCC2839D datasheet, UCC2839D pinout, UCC2839D application, or UCC2839D equivalent, this page delivers verified technical context, SOIC-14 package mapping, real-world use cases in telecom and industrial AC/DC adapters, and two confirmed alternative controllers with documented functional differences.
Technical Context
The UCC2839D implements secondary-side control by decoupling PWM generation (on primary side) from sensing and error processing (on secondary side), communicating across isolation via opto-coupler-driven Gm amplifier output. Its architecture includes independent voltage and current error amplifiers, each with ≥60 dB PSRR and CMRR, and a dedicated 7.5V internal bias regulator powered from peak-rectified transformer winding.
It supports two configuration modes: traditional average current mode (VAO → CA+) and parallel voltage/current loop control (VAO tied to CAO), enabling programmable current-limit threshold via resistive divider from 5V REF. The current sense amplifier provides 1V zero-input offset and 2–4 V/µs slew rate for fast transient response under overload conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +85°C - qualified for industrial-grade power supply environments requiring extended thermal stability. |
| Reference Voltage | 5.0 V ±1% - stable, buffered reference for precise current-limit programming and error amplifier biasing. |
| Current Sense Gain | 8 V/V - enables accurate shunt-based output current measurement with 1V CSO at zero input, supporting 0A start-up regulation. |
| Gm LED Driver Output | 0–11 mA - programmable opto-isolator LED current via GM pin resistor, ensuring reliable cross-isolation signal transmission. |
| VDD Regulator Output | 7.5 V (7–8 V range) - self-generated bias rail from external N-channel depletion FET, sustaining operation during short-circuit events. |
| Error Amplifier GBW | 3–5 MHz - supports high-speed compensation of both voltage and current loops without external phase compensation overhead. |
| Supply Voltage Range | 10–40 V on VLINE - accommodates wide-range rectified secondary winding voltages without external regulators. |
Pinout & Package
UCC2839D is housed in a 14-pin SOIC (D package), 3.90 mm width, with standard JEDEC MS-012AC footprint and moisture sensitivity level (MSL) not specified per TI documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Chip Ground Reference | Common return path for all analog and power sections; requires low-impedance PCB connection to minimize noise coupling into error amplifiers. |
| REF | 5V Precision Reference Output | Buffered 5V source used to set current-limit threshold via resistive divider; minimum 0.01 µF decoupling required. |
| VDD | 7.5V Internal Bias Regulator Output | Supplies core logic and amplifiers; powers external depletion-mode FET gate; requires 0.01 µF decoupling capacitor. |
| CAO | Current Error Amplifier Output | Drives Gm amplifier input; clamped to ≤5V during short circuit; sinks >250 µA to ensure opto-isolator turn-on reliability. |
| VAO | Voltage Error Amplifier Output | Provides current command signal to CA+ in single-loop mode; internally clamped to prevent overdrive of current loop during fault. |
| CSO | Current Sense Amplifier Output | Differential shunt voltage output (1V at zero current); feeds CA– through external resistor to close current loop with fixed 8× gain. |
| GM | Gm Amplifier Programming Input | Resistor-to-ground sets LED drive transconductance (2.25–2.75 mS); determines opto-isolator current scaling and loop gain. |
| LED | Gm Amplifier Output / Opto-LED Anode | Directly drives opto-isolator LED anode; sinks up to 11 mA; connects to VDD via LED cathode for isolated feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Secondary-side average current mode control | Enables precise output current regulation independent of primary-side PWM timing, eliminating duty-cycle limitations and improving load transient response in isolated topologies. |
| Self-regulating bias supply | Generates internal 7.5V VDD from unregulated secondary winding using external N-channel depletion FET - sustains operation during output short circuits where conventional bias rails collapse. |
| Dual-loop voltage/current regulation | Supports parallel VAO–CAO configuration to maintain voltage regulation until user-defined current limit is reached, then seamlessly transitions to constant-current mode without latch or reset. |
| Fixed-gain differential current sense amplifier | 8 V/V gain with 0.85–1.15 V zero-input offset ensures accurate shunt-based current measurement across full common-mode range (–0.3 V to 5.5 V), critical for low-side sensing in high-side-switched converters. |
| Optimized Gm LED driver | Programmable 2.25–2.75 mS transconductance with 1–4 V/µs slew rate delivers fast, linear opto-isolator current control - reduces propagation delay and improves loop stability across temperature and aging. |
Applications
| Telecom AC/DC Adapters | Industrial Programmable Power Supplies |
|---|---|
Use Scenario: 48 V input telecom rectifier supplying 12 V/20 A output with tight current limiting and remote sense capability. IC Role / Device Role / Timing Role: Secondary-side controller managing isolated feedback, current foldback, and opto-isolated communication to primary PWM IC. Use Value: Enables <1% output current tolerance across line/load/temperature while maintaining isolation compliance and surviving sustained short-circuit events. |
Use Scenario: Bench-style 0–30 V, 0–10 A lab power supply requiring programmable CC/CV transition and overcurrent protection with analog interface. IC Role / Device Role / Timing Role: Core regulation engine implementing dual-loop CV/CC control with externally adjustable current limit via REF pin. Use Value: Delivers smooth, glitch-free transition between voltage and current regulation modes without hysteresis or latching, meeting EN 61000-3-2 harmonic requirements. |
| Medical Isolated DC/DC Modules | Server PSU Auxiliary Regulation |
Use Scenario: 24 V input, 5 V/3 A isolated auxiliary rail for patient-monitoring front-end with reinforced creepage/clearance requirements. IC Role / Device Role / Timing Role: Safety-isolated secondary controller providing galvanically separated feedback and current monitoring for Class II medical systems. Use Value: Meets IEC 60601-1 creepage requirements via opto-isolation path while delivering ±2% current limit accuracy over –40°C to +85°C. |
Use Scenario: 12 V standby rail in 1U server PSU with dynamic load sharing and brown-out immunity during main converter faults. IC Role / Device Role / Timing Role: Standby regulator controller maintaining auxiliary output during main converter shutdown or overload. Use Value: Self-powered VDD regulator sustains operation when main output collapses, enabling graceful system shutdown and fault logging via isolated signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary-side current-mode control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC3839D | Same pinout and architecture but rated for 0°C to +70°C only; lacks extended temperature qualification. | Suitable for commercial-grade applications (e.g., consumer adapters) where ambient temperature stays below 70°C. | Select UCC3839D only if operating temperature remains within 0–70°C and industrial qualification is unnecessary. |
| LM5025C | Primary-side synchronous PWM controller with integrated gate drivers; no secondary-side sensing or opto-driver; requires different isolation strategy. | Used in cost-sensitive, lower-performance isolated flyback designs where secondary complexity must be minimized. | Choose LM5025C only when moving control entirely to primary side and accepting reduced current-sense accuracy and slower overload response. |
Compared with UCC2839D, UCC3839D offers identical functionality but narrower temperature range, while LM5025C shifts control responsibility to the primary side-requiring redesign of feedback architecture and sacrificing secondary-side current regulation fidelity.
Availability
UCC2839D is available at Aetrix Electronics and suitable for telecom AC/DC adapters, industrial programmable power supplies, and medical isolated DC/DC modules requiring stable component supply under extended temperature and safety-isolation constraints.
Supply support for UCC2839D 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 solutions.
The UCC2839D belongs to TI's UCC383x family of secondary-side controllers, designed specifically to enable robust, isolated average current mode regulation in AC/DC and DC/DC converters where primary-side sensing is impractical or insufficient.
FAQ
What is the operating temperature range of the UCC2839D?
The UCC2839D is specified for operation from –40°C to +85°C, making it suitable for industrial and telecom power supply applications exposed to wide ambient temperature swings. This extended range distinguishes it from the UCC3839D (0°C to +70°C) and confirms its qualification for harsh-environment deployment where thermal derating must be minimized.
How does the UCC2839D generate its internal bias supply?
The UCC2839D generates its 7.5V internal VDD bias rail using an external N-channel depletion-mode FET connected between the peak-rectified secondary winding and the VDD pin. This self-regulating architecture allows continuous operation even during output short circuits - a key advantage over controllers dependent on auxiliary windings or linear regulators that fail under fault conditions.
Can the UCC2839D support both voltage-only and current-limited regulation modes?
Yes, the UCC2839D supports two distinct configurations: traditional average current mode (VAO → CA+) for pure current regulation, and parallel voltage/current loop mode (VAO tied to CAO) for automatic CV-to-CC transition. In the latter, the voltage error amplifier regulates output voltage until current reaches the threshold set by a resistive divider from the 5V REF pin - at which point the current loop takes precedence.
What is the function of the GM pin on the UCC2839D?
The GM pin on the UCC2839D sets the transconductance of the internal Gm amplifier that drives the opto-isolator LED. A resistor from GM to GND programs the LED drive current scaling factor (2.25–2.75 mS), directly determining loop gain and opto-isolator bandwidth. This allows designers to optimize stability and transient response without modifying external compensation networks.
Is the UCC2839D still in active production?
No - according to Texas Instruments' official packaging addendum, the UCC2839D is marked "OBSOLETE", indicating discontinued production. However, Aetrix Electronics maintains legacy inventory and supports design-in continuity through traceable, tested stock and lifecycle coordination for ongoing industrial and medical programs reliant on this mature, proven controller.
UCC2839D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Applications:
- Secondary-Side Controller
- Voltage - Input:
- -
- Voltage - Supply:
- 7.5V ~ 15V
- Current - Supply:
- 1.3 mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
UCC2839D FAQ
1.How can I place an order for UCC2839D through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2839D 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 UCC2839D reliable?
The price and inventory of UCC2839D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2839D is usually 5 days.
3.What payment methods are accepted for UCC2839D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2839D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2839D?
UCC2839D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2839D 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 UCC2839D?
For technical support, including UCC2839D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2839D requirements.
6.How does Aetrix verify that UCC2839D is sourced from the original manufacturer or authorized distributors?
All UCC2839D 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 UCC2839D meets industry standards.
7.What is the process for return or replacement of UCC2839D?
All UCC2839D units undergo pre-shipment inspection (PSI). If there is an issue with UCC2839D, 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 UCC2839D part is unused and in its original packaging.
Return procedure for UCC2839D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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