UCC28720D Part Information
The UCC28720 flyback power supply controller provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. An internal 700-V start-up switch, dynamicallycontrolled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response. Control algorithms in the UCC28720 allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor 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 80 kHz and always maintains control of the peakprimary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28720 allows compensation for voltage drop in the cable to be programmed with an external resistor.
- 700-V Start-Up Switch
- 80-kHz Maximum Switching Frequency Enables High-Power Density Charger Designs
- < 10-mW No-Load Power
- Dynamic BJT Drive
- Overvoltage, Low-Line, and Overcurrent Protection Functions
- Primary-Side Regulation (PSR) Eliminates Opto- Coupler
- Programmable Cable Compensation
- Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency
- SOIC-7 Package
- Wide VDD Range Allows Small Bias Capacitor
- u00b15% Voltage and Current Regulation Across Line and Load
|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
- Constant-voltage, constant-current controller with primary-side regulation for bipolar power devices | Texas Instruments
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The UCC28720D is listed under Electronic & Electrical Components > Semiconductors - ICs > Power Management.
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