Packaging information
| Package | Pins SOT-23 (DBV) | 5 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 250 | SMALL T&R |
Features for the UCC24650
- 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
Description for the UCC24650
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.