UCC28740D Part Information
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.
- 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
|Supply Voltage Min||9V|
|Supply Voltage Max||35V|
|Controller IC Case Style||SOIC|
|No. of Pins||7Pins|
|Operating Temperature Min||-40°C|
|Operating Temperature Max||125°C|
|Automotive Qualification Standard||-|
|RoHS Phthalates Compliant||Yes|
|MSL||MSL 1 - Unlimited|
|SVHC||No SVHC (27-Jun-2018)|
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
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What category does UCC28740D fall under?
The UCC28740D is listed under Electronic & Electrical Components > Semiconductors - ICs > Power Management.
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Is the UCC28740D RoHS compliant?
Yes. This part has been flagged as RoHS Compliant by Farnell.
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Authorised distributors including Newark Electronics and Texas Instruments have stock available or on a lead time for UCC28740D.
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