UCC24650 Series
200-V wake-up monitor for fast transient primary-side regulation
Manufacturer: Texas Instruments
Catalog(1 parts)
| Part | Current - Supply▲▼ | Voltage - Supply▲▼ | Voltage - Supply▲▼ | Supplier Device Package | Mounting Type | Operating Temperature▲▼ | Operating Temperature▲▼ | Package / Case | Applications |
|---|---|---|---|---|---|---|---|---|---|
0.00006299999949987978 A | 28 V | 4.5 V | SOT-23-5 | Surface Mount | 125 °C | -40 °C | SC-74A, SOT-753 | Wake Up Monitor |
Key Features
• Enables Excellent Load Transient Performance and Zero Standby PowerEnables Smallest Output Capacitor for Tight ΔVOUTNo External Components Required<50 µA Device Current Consumption (Typical)5-V to 28-V Output Monitoring Capability3% Voltage Droop Detection (Patent Pending)200-V Wake-Up SwitchEnables and Disables SR Controller, Relay Control, or Other Secondary CircuitsSOT-23 5-Pin PackageEnables Excellent Load Transient Performance and Zero Standby PowerEnables Smallest Output Capacitor for Tight ΔVOUTNo External Components Required<50 µA Device Current Consumption (Typical)5-V to 28-V Output Monitoring Capability3% Voltage Droop Detection (Patent Pending)200-V Wake-Up SwitchEnables and Disables SR Controller, Relay Control, or Other Secondary CircuitsSOT-23 5-Pin Package
Description
AI
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.
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.