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Texas Instruments UCC3839D
- Part No.:
- UCC3839D
- Manufacturer:
- Texas Instruments
- Category:
- Power Supply Controllers, Monitors
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC3839D.pdf
- Description:
- IC SECONDARY SIDE CTRLR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,327
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Product details
Overview
UCC3839D 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 (2.5 mS typ, 9–11 mA LED output). It enables opto-isolated feedback with dual-loop voltage/current regulation in telecom and industrial SMPS.
For engineers reviewing the UCC3839D datasheet, UCC3839D pinout, UCC3839D application, or UCC3839D equivalent, key selection criteria include its SOIC-14 package, 0°C to 70°C operating range, 7.5V internal bias regulator, and support for both traditional average current mode and voltage-mode-with-short-circuit-limit configurations.
Technical Context
The UCC3839D integrates three core analog blocks: a differential current sense amplifier (CS+, CS– inputs; CSO output at 1V for zero input), a voltage error amplifier (VA– referenced to 1.5V, VAO clamped ≤5V), and a programmable transconductance LED driver (GM pin sets gain via 400Ω resistor). All operate from an internally regulated 7.5V VDD rail derived from external peak-rectified secondary winding voltage.
It supports two distinct control topologies: (1) cascaded loop where VAO commands CA+, and (2) parallel loop where VAO and CAO are tied-enabling automatic switchover to current limiting when output current exceeds a user-defined threshold set by a resistive divider from the 5V REF pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp | 0°C to 70°C - defines commercial-grade thermal envelope for stable operation in non-automotive power systems |
| Reference Voltage | 5.0 V ±1% - provides precise, low-drift bias for resistive dividers setting current limit thresholds |
| Current Sense Gain | 8 V/V - enables accurate shunt-based output current sensing with 0V–5V common-mode input range |
| VDD Regulator | 7.5 V (7–8 V range) - powers internal circuitry from unregulated secondary winding, sustaining operation during short circuits |
| Gm Driver Output | 2.5 mS typ, 9–11 mA LED drive - directly interfaces standard opto-couplers without external buffering |
| Error Amp GBW | 3–5 MHz - supports fast transient response in dual-loop compensation networks |
| Supply Voltage Max | 15 V - sets absolute ceiling for VLINE input to bias regulator, limiting transformer secondary rectifier design margin |
Pinout & Package
UCC3839D is housed in a 14-pin SOIC (D package), 3.90 mm width, with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Thermal performance rated per TI packaging guidelines; maximum power dissipation is 55 mW when LED is connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | 7.5V Regulator Output | Internal supply rail powering all analog blocks; requires ≥0.01 µF decoupling to GND |
| REF | 5V Precision Reference Buffer | Stable 5V source for setting current limit thresholds; min 0.01 µF capacitor required |
| CAO | Current Error Amplifier Output | Drives GM amplifier; sink current > VAO source current ensures reliable opto-coupler turn-on |
| VAO | Voltage Error Amplifier Output | Clamped to ≤5V; used as current command (CA+) or tied to CAO for parallel-loop short-circuit control |
| CSO | Current Sense Amplifier Output | 1V at zero input; differential gain of 8 V/V enables 0A–full-scale current regulation |
| GM | Gm Programming Input | Resistor to GND (400Ω typical) sets LED driver transconductance and output current range |
| GND | Chip Ground | Analog reference for all amplifiers; separate from power ground in layout best practice |
| LED | LED Driver Output | Connects cathode of opto-LED to VDD; current sourced/sunk based on CAO level |
Key Features
| Feature | Design Value |
|---|---|
| Secondary-side average current mode control | Enables precise output current regulation independent of primary-side PWM, eliminating current-sense transformer requirements |
| Dual-loop configuration support | Allows either cascaded (voltage commands current) or parallel (voltage and current compete) control - selectable via VAO–CAO connection |
| Self-regulating bias supply | Generates internal 7.5V VDD from peak-rectified secondary winding, maintaining functionality under output short-circuit conditions |
| Opto-isolator-optimized Gm driver | Programmable 2.5 mS transconductance and 9–11 mA output drive eliminate need for external transistor buffers |
| Fixed-gain differential current sense | 8 V/V gain with 0V–5V common-mode input range simplifies shunt placement and improves noise immunity vs. single-ended sensing |
Applications
| Telecom Power Supplies | Industrial DC/DC Converters |
|---|---|
Use Scenario: 48V input, 3.3V/50A isolated DC/DC module for base station RF power amplifiers. IC Role / Device Role / Timing Role: Secondary-side controller managing output current accuracy and short-circuit foldback while maintaining isolation. Use Value: Enables ±1% current regulation across line/load/temperature using only a 1 mΩ shunt and standard PC817 opto-coupler. | Use Scenario: 24V–72V wide-input isolated converter for PLC I/O modules requiring fault-tolerant current limiting. IC Role / Device Role / Timing Role: Dual-loop controller providing nominal voltage regulation until user-defined current threshold is reached, then switching to constant-current mode. Use Value: Prevents runaway during short circuits without auxiliary overcurrent protection circuitry, reducing BOM count and board space. |
| Medical Power Adapters | Test & Measurement Equipment |
Use Scenario: Isolated 12V/10A AC/DC adapter for portable diagnostic devices requiring Class II safety and low leakage. IC Role / Device Role / Timing Role: Secondary-side feedback controller ensuring compliance with IEC 60601-1 creepage/clearance by eliminating primary-side current sensing components. Use Value: Eliminates need for isolated current transformers or Hall sensors, lowering cost and improving long-term reliability in safety-critical designs. | Use Scenario: Programmable 15V/3A bench power supply with adjustable current limit and remote sense capability. IC Role / Device Role / Timing Role: Precision current sense and dual-loop regulation engine enabling simultaneous voltage setpoint and current limit programming via REF-derived dividers. Use Value: Allows independent adjustment of voltage regulation point and current foldback threshold using only passive resistors referenced to the onboard 5V REF. |
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 |
|---|---|---|---|
| UCC2839D | Same architecture and pinout, but rated for –40°C to +85°C industrial temperature range; higher VIO (10 mV max) and lower PSRR (60 dB) identical to UCC3839D | Supports extended ambient environments; otherwise functionally interchangeable in new designs requiring wider temp range | Select UCC2839D when operating below 0°C or above 70°C; verify bias supply stability over full range |
| UC3846N | Primary-side current-mode PWM controller (not secondary-side); requires external current transformer; no integrated 5V REF or Gm LED driver | Suitable only for primary-side control architectures; lacks opto-isolation interface and dual-loop capability | Choose UC3846N only if redesigning to primary-side sensing is acceptable; not drop-in compatible |
Compared with UCC2839D and UC3846N, the UCC3839D uniquely delivers secondary-side average current control with integrated bias regulation, 5V reference, and opto-driver in a single SOIC-14 package-making it optimal for compact, isolated supplies where safety isolation and short-circuit robustness are critical.
Availability
UCC3839D is available at Aetrix Electronics and suitable for telecom power supplies, industrial DC/DC converters, medical adapters, and test equipment requiring stable component supply and legacy design continuity.
Supply support for UCC3839D 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The UCC3839D belongs to TI's legacy power management controller family designed specifically for high-reliability isolated power conversion with secondary-side feedback integrity and inherent short-circuit protection.
FAQ
What is the operating temperature range specified for the UCC3839D?
The UCC3839D is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range is documented in the SLUS179A datasheet's Electrical Characteristics table and distinguishes it from the industrial-grade UCC2839D (–40°C to +85°C). The UCC3839D's internal 5V reference and 7.5V VDD regulator maintain accuracy within this envelope.
How does the UCC3839D generate its internal supply voltage?
The UCC3839D generates its internal 7.5V VDD supply using an external N-channel depletion-mode FET and peak-rectified voltage from the secondary winding of the isolation transformer. This self-regulating bias supply sustains UCC3839D operation even during output short-circuit conditions, ensuring continuous feedback and protection-no auxiliary winding or linear regulator is needed.
Can the UCC3839D be used in single-loop voltage mode applications?
Yes, the UCC3839D supports single-loop voltage mode operation by connecting VAO directly to CAO, effectively disabling the current error amplifier's command function. In this configuration, the voltage error amplifier alone regulates output voltage, while the current sense amplifier and Gm driver remain active for optional monitoring-though short-circuit limiting requires the dual-loop setup.
What is the purpose of the GM pin on the UCC3839D?
The GM pin on the UCC3839D sets the transconductance of the internal LED driver amplifier. A 400Ω resistor from GM to GND programs the driver for 2.25–2.75 mS gain, yielding 9–11 mA LED current during normal operation. This allows direct interfacing with standard opto-couplers like PC817 without external current-setting components.
Is the UCC3839D pin-compatible with the UCC2839D?
Yes, the UCC3839D is pin-compatible with the UCC2839D: both use the SOIC-14 (D package) footprint and share identical pin functions, electrical characteristics (except temperature range and minor parameter tolerances), and block diagram architecture. Layouts designed for one can accommodate the other, though thermal validation is required when substituting into industrial-temperature applications.
UCC3839D 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
UCC3839D FAQ
1.How can I place an order for UCC3839D through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3839D 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 UCC3839D reliable?
The price and inventory of UCC3839D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3839D is usually 5 days.
3.What payment methods are accepted for UCC3839D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3839D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3839D?
UCC3839D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3839D 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 UCC3839D?
For technical support, including UCC3839D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3839D requirements.
6.How does Aetrix verify that UCC3839D is sourced from the original manufacturer or authorized distributors?
All UCC3839D 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 UCC3839D meets industry standards.
7.What is the process for return or replacement of UCC3839D?
All UCC3839D units undergo pre-shipment inspection (PSI). If there is an issue with UCC3839D, 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 UCC3839D part is unused and in its original packaging.
Return procedure for UCC3839D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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