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UCC24650

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

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Data sheet

UCC24650

ACTIVE
Data sheet Order now

Product details

Vin (max) (V) 30 Operating temperature range (°C) -40 to 125 Control mode Volt-sec balance Topology Flyback Rating Catalog Features Fast load transient support, Negative Voltage Monitoring, Wake-up Monitor
Vin (max) (V) 30 Operating temperature range (°C) -40 to 125 Control mode Volt-sec balance Topology Flyback Rating Catalog Features Fast load transient support, Negative Voltage Monitoring, Wake-up Monitor
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8
  • 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.
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Technical documentation

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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 PDF | HTML 27 Aug 2018
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 (...)

User guide: PDF
Not available on TI.com
Simulation model

UCC28730 & UCC24650 PSpice Transient Model

SLUM527.ZIP (103 KB) - PSpice Model
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Reference designs

PMP9561 — 5V/10W Off-Line DCM Flyback Converter Optimized for Zero-Power at No-Load - Reference Design

This design features the UCC28730 flyback controller in conjunction with the UCC24650 wake-up monitor to provide CV, CC regulated output with ultra-low stand-by power that exceeds Level VI and CoC Tier 2 specifications for average efficiency and 10% load efficiency.  Wake-up signal detection (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP11303 — High Efficiency 350W AC/DC Power Supply Reference Design

PMP11303 is high-efficiency AC/DC power supply reference design with universal AC input and 25V/13.5A and 12V/1A outputs. LLC+PFC combo IC UCC29950 is applied for the main power stages with 25V/13.5A output while UCC28730 is applied for the auxiliary power with 12V/1A output. This design has low no (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-01560 — 15W Dual Isolated Output Bias Power Supply with 4mW Zero Standby Power Consumption Reference Design

This reference design is a 15-W bias power supply with two isolated outputs (12 V/1.125A and 3.3 V/0.3A) and a total standby power consumption of 4 mW under a 220-V AC input. The controller uses primary-side regulation (PSR) and detects a wake-up signal from the UCC24650 secondary-side (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP41063 — 300-V-1,000V input 48-W isolated auxiliary power reference design with low standby power

This reference design provides an isolated 12-V, 48-W output power conversion with cascaded flyback topology. The power supply can be powered from the 300-V to 1,000-V direct current (DC) input. This design uses valley switching flyback controller UCC28730 to achieve less than 70-mW low standby (...)
Test report: PDF
Reference designs

PMP31248 — 230V AC input 12V primary side regulated flyback reference design

This reference design is a quasi-resonant flyback power supply based on the UCC28730 primary side regulation (PSR) controller and UCC24650 (wake-up monitor). Using PSR topology eliminates the need of an optocoupler, increases reliability and optimizes system cost. This design achieves less than 6 (...)
Test report: PDF
Reference designs

PMP30092 — 160W Primary-Side Regulated Flyback Using UCC28633 Reference Design

The PMP30092 reference design uses the UCC28633 high power flyback converter to generate an isolated output (27V @ 6A). The UCC28633 operates in both CCM (continuous conduction mode) and DCM (discontinuous conduction mode). Primary side regulation eliminates the need for an opto-coupler and (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP40025 — 85 to 265Vac In, 48V1A Out Power Supply for STB with <75mW Standby Power Reference Design

The PMP40025 is a universal AC input, 48W output flyback converter based on primary side regulation(PSR) which eliminates optocouplers and secondary side feedback components reducing BOM cost. The design features a single 48V/1A output with average efficiency greater than 89% and 75mW no load (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP11295 — USB-C DFP, 5V/3A Out, Universal AC Input Reference Design

This power reference design provides 5V/15W over USB-C from a universal AC input range of 85-265VAC. The UCC24636 synchronous rectifer driver and CSD18540Q5B MOSFET allow this design to provide 84% average efficiency. The TPS25810 provides the PD port control over the USB-C output (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP10407 — Universal AC Input, 5V/10A/50W PSR Flyback Power Supply W/Rapid Load Transient Response Ref Design

PMP10407 is a quasi-resonant Flyback power suppy based on the UCC28730 primary side regulation (PSR) controller demonstrating the use of wake up device UCC24650 to achieve rapid load transient response from light load condition when the system is under low frequency operation. The elimination of (...)
Test report: PDF
Schematic: PDF
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