The UCC28720D is a 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 700V 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.
● <10mW No-load power
● Primary-side regulation (PSR) eliminates opto-coupler
● ±5% Voltage and current regulation across line and load
● 700V Start-up switch
● 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
●Device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
