UCC24650

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200-V wake-up monitor for fast transient primary-side regulation

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Product details

Parameters

Frequency (Max) (kHz) 83 UVLO thresholds on/off (V) 4.0/3.75V Features Chip Enable Gating, Negative Voltage Monitoring Operating temperature range (C) -40 to 125 open-in-new Find other Synchronous rectifier (SR) controllers

Package | Pins | Size

SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 open-in-new Find other Synchronous rectifier (SR) controllers

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
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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.

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Technical documentation

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Type Title Date
* Datasheet UCC24650 200-V Wake-Up Monitor for Fast Transient PSR datasheet Feb. 04, 2015
Technical articles Get smarter about ‘zero’ standby power in your next appliance design Aug. 27, 2018
Technical articles Achieving Zero No-Load Power Mar. 06, 2015
Application notes Rapid Transient Response With UCC28633 PSR-Flyback and UCC24650 Wake-Up Monitor Feb. 27, 2015
User guides Using the UCC28730EVM-552 10-W Adaptor Module With PSR and Wake-Up Monitor Feb. 06, 2015

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$99.00
Description

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 (...)

Features
  • Less than 5mW of no-load power
  • Primary side regulation eliminates opto-coupler
  • Wake-up detection helps minimize no-load switching frequency and output capacitance
  • +/-5% voltage and current regulation across line and load
  • Resonant ring valley switching operation for highest overall efficiency

Design tools & simulation

SIMULATION MODELS Download
SLUM527.ZIP (103 KB) - PSpice Model

Reference designs

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.

CAD/CAE symbols

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

Ordering & quality

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