Product details

Topology Flyback Frequency (Max) (kHz) 83 UVLO thresholds on/off (V) 4.0/3.75V Supply voltage (Max) (V) 28 Features Wake-up Monitor, Chip Enable Gating, Negative Voltage Monitoring, Fast load transient support Operating temperature range (C) -40 to 125
Topology Flyback Frequency (Max) (kHz) 83 UVLO thresholds on/off (V) 4.0/3.75V Supply voltage (Max) (V) 28 Features Wake-up Monitor, Chip Enable Gating, Negative Voltage Monitoring, Fast load transient support Operating temperature range (C) -40 to 125
SOT-23 (DBV) 5 5 mm² 2.9 x 1.6
  • 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
  • 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

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.

Download

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 6
Type Title Date
* Data sheet UCC24650 200-V Wake-Up Monitor for Fast Transient PSR datasheet PDF | HTML 04 Feb 2015
More literature Achieving High Power Density and Ultra Low Standby Power in Flyback Converters 23 Mar 2021
Technical article Get smarter about ‘zero’ standby power in your next appliance design 27 Aug 2018
Technical article Achieving Zero No-Load Power 06 Mar 2015
Application note Rapid Transient Response With UCC28633 PSR-Flyback and UCC24650 Wake-Up Monitor 27 Feb 2015
EVM User's guide Using the UCC28730EVM-552 10-W Adaptor Module With PSR and Wake-Up Monitor 06 Feb 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

UCC28730EVM-552 — UCC28730 Primary Side Flyback Controller with UCC24650 Secondary Side Wake Up

The UCC28730EVM-552 evaluation module is a 10-W off-line discontinuous mode (DCM) flyback converter that provides constant-voltage (CV) and constant-current (CC) output regulation without the use of an optical coupler.  The primary side controller detects a wake-up signal from the secondary (...)

Not available on TI.com
Simulation model

UCC28730 & UCC24650 PSpice Transient Model

SLUM527.ZIP (103 KB) - PSpice Model
Many TI reference designs include the UCC24650

Use our reference design selection tool to review and identify designs that best match your application and parameters.

Package Pins Download
SOT-23 (DBV) 5 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos