Texas Instruments UCC28730DR | Demoboard TIDA-01560

Description

The UCC24650 is an easy-to-use secondary-side voltage monitor that periodically measures its own VDD voltage. A relative droop of 3% from the previous reading triggers a alert signal to a receiving primary-side regulation (PSR) controller. Its low-power consumption helps achieve <5-mW standby loss in many applications.An internal 200-V MOSFET switch is applied across a ground-referenced rectifier to provide a current-limited pulse to the flyback transformer secondary winding, which couples the signal to the primary-side controller. This signal is repeated at 33 kHz until controller-driven switching activity is detected.Relative-droop detection allows scaling to any voltage between 5 and 28 V. The alert function allows very-low standby frequency to minimize switching loss and reduction of output capacitance needed to respond to a heavy load step. This monitor is used with a controller capable of detecting the signal, such as the UCC28730 PSR flyback controller.The UCC24650 also provides an enable and disable signal which can be used to control a secondary-side circuit during no-load conditions to reduce standby power loss. Such a circuit may be a synchronous rectifier controller or a relay driver, for example.

Features

• Enables Excellent Load Transient Performance and Zero Standby Power
• Enables Smallest Output Capacitor for Tight ΔVOUT
• No External Components Required
• <50 µA Device Current Consumption (Typical)
• 5-V to 28-V Output Monitoring Capability
• 3% Voltage Droop Detection (Patent Pending)
• 200-V Wake-Up Switch
• Enables and Disables SR Controller, Relay Control, or Other Secondary Circuits
• SOT-23 5-Pin Package

Typical applications

• Washing Machines / Coffee Machines / Cooking Ranges / Small Home Appliances / Disinfection Cabinets / Toilet Seat Covers / TV and Monitor Power Supplies

More information

• IC product information