UCC28740D Part Information

Details for UCC28740D by Texas Instruments

Electronic & Electrical Components>Semiconductors - ICs>Power Management

Part Description

The UCC28740 isolated-flyback power-supply controller provides Constant-Voltage (CV) using an optical coupler to improve transient response to largeload steps. Constant-Current (CC) regulation is accomplished through Primary-Side Regulation (PSR) techniques. This device processes information from opto-coupled feedback and an auxiliary flyback winding for precise high-performance control of output voltage and current. An internal 700-V startup switch, dynamically controlled operating states, and a tailored modulation profile support ultra-low standby power without sacrificing startup time or output transient response. Control algorithms in the UCC28740 allow operating efficiencies to meet or exceed applicable standards. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges. The controller has a maximum switching frequency of 100 kHz and always maintains control of the peakprimary current in the transformer. Protection features keep primary and secondary component stresses in check. A minimum switching frequency of 170 Hz facilitates the achievement of less than 10-mW noload power.

Part Downloads

Featured content from Farnell

Part Features

  • 100-kHz Maximum Switching Frequency Enables High-Power-Density Charger Designs
  • 700-V Startup Switch
  • Clamped Gate-Drive Output for MOSFET
  • Enables u00b11% Voltage Regulation and u00b15% Current Regulation Across Line and Load
  • Frequency Dithering to Ease EMI Compliance
  • Less than 10-mW No-Load Power Capability
  • Opto-Coupled Feedback for CV, and Primary-Side Regulation (PSR) for CC
  • Overvoltage, Low-Line, and Overcurrent Protection Functions
  • Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
  • SOIC-7 Package

Part Specifications

Input Voltage -
Output Voltage -
Output Current -
Supply Voltage Min 9V
Supply Voltage Max 35V
Controller IC Case Style SOIC
No. of Pins 7Pins
Frequency 100kHz
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant Yes
MSL MSL 1 - Unlimited
SVHC No SVHC (27-Jun-2018)
RoHS Compliant

Alternative Part Descriptions

  • IC, CV/CC FLYBK CONTROLLER, 38V, SOIC-7; Input Voltage:-; Output Voltage:-; Output Current:-; Supply Voltage Min:9V; Supply Voltage Max:35V; Controller IC Case Style:SOIC; No. of Pins:7Pins; Frequency:100kHz; Operating Temperature RoHS Compliant: Yes | Newark Electronics
  • Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR) | Texas Instruments

Frequently Asked Questions

Where can I find additional details, specifications and documents for a UCC28740D?

Additional datasheets, footprints and schematics for UCC28740D are listed in our Part Details tab. You can also find the UCC28740D image and similar parts on this details page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for UCC28740D in the Pricing & Inventory tab next to part details. You can view UCC28740D price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does UCC28740D fall under?

The UCC28740D is listed under Electronic & Electrical Components > Semiconductors - ICs > Power Management.

Can I view similar or alternative parts?

You can view similar parts to UCC28740D when available in the Power Management range under the specifications section at the bottom of the details page.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the UCC28740D you can contact the distributor directly for product support, shipping queries etc.

Is the UCC28740D RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Farnell.

Which authorised distributors for UCC28740D have stock available?

Authorised distributors including Newark Electronics and Texas Instruments have stock available or on a lead time for UCC28740D.

How do I check stock and lead times for all distributors?

Stock availability and lead times will be displayed for UCC28740D often in real-time on the comparison pages.

What if I can't find stock of UCC28740D?

You can fill out our help required form which you can use to request a quote for UCC28740D from some of our verified obsolescence suppliers. Alternatively, contact us via our web chat in the bottom left of your screen and one of our team will try to help.

Viewing Distributors for UCC28740D

Loading...
Loading Results for UCC28740D