Current Mode PWM Controller 7-Pin SOIC Tube

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, dynamically-controlled 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 peak-primary 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. 

< 10-mW No-Load Power

Primary-Side Regulation (PSR) Eliminates Opto-Coupler

±5% Voltage and Current Regulation Across Line and Load

700-V Start-Up Switch

80-kHz Maximum Switching Frequency Enables High-Power Density Charger Designs

Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency

Wide VDD Range Allows Small Bias Capacitor

Dynamic BJT Drive

Overvoltage, Low-Line, and Overcurrent Protection Functions

Programmable Cable Compensation

SOIC-7 Package