UCC28742

AKTIV

Hocheffizienter Flyback-Controller mit Ausgangsregelgenauigkeit von 1 %

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Datenblatt

document-pdfAcrobat UCC28742 High-Efficiency Flyback Controller with Optocoupler Feedback datasheet (Rev. A) (Englisch) PDF | HTML

UCC28742

AKTIV

Datenblatt

Jetzt bestellen

Produktdetails

Topology

Flyback

Control mode

Secondary-side regulation

Features

Current limiting, DCM, Light load efficiency, Overcurrent protection, Overvoltage protection, Quasi-Resonant, Secondary-side regulated, Soft start, USB C/PD compatible, Valley switching

Duty cycle (max) (%)

99

Topology

Flyback

Control mode

Secondary-side regulation

Features

Current limiting, DCM, Light load efficiency, Overcurrent protection, Overvoltage protection, Quasi-Resonant, Secondary-side regulated, Soft start, USB C/PD compatible, Valley switching

Duty cycle (max) (%)

99

SOT-23 (DBV)

6

8.12 mm² (2.9 mm × 2.8 mm)

Opto-Coupled Feedback Enables up to 1% Regulation
Accurate Current Limit with Overload Timeout Protection and Delayed Hiccup Response
Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
80-kHz Maximum Switching Frequency
Frequency Dithering to Ease EMI Compliance
Clamped Gate-Drive Output for MOSFET
Ultra-Low Start-Up Current and Large VDD Hysteresis
- High Value Start-Up Resistor
- Low Bias Capacitance
Fault Protections
- Input Low Line
- Output Over-Voltage
- Over-Current
- Short-Circuit
SOT23-6 Package
Create a Custom Design Using the UCC28742 with the WEBENCH^® Power Designer

Opto-Coupled Feedback Enables up to 1% Regulation
Accurate Current Limit with Overload Timeout Protection and Delayed Hiccup Response
Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
80-kHz Maximum Switching Frequency
Frequency Dithering to Ease EMI Compliance
Clamped Gate-Drive Output for MOSFET
Ultra-Low Start-Up Current and Large VDD Hysteresis
- High Value Start-Up Resistor
- Low Bias Capacitance
Fault Protections
- Input Low Line
- Output Over-Voltage
- Over-Current
- Short-Circuit
SOT23-6 Package
Create a Custom Design Using the UCC28742 with the WEBENCH^® Power Designer

The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-side regulated PWM controller for efficient AC-to-DC power supplies. It is an isolated-flyback power-supply controller that provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. This device processes information from opto-coupled feedback and an auxiliary flyback winding for high-performance control of output voltage and current.

The UCC28742 employs advanced control algorithms to achieve high operating efficiency and performance. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. A minimum switching frequency of 200 Hz facilitates the achievement of low no-load input power.

The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-side regulated PWM controller for efficient AC-to-DC power supplies. It is an isolated-flyback power-supply controller that provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. This device processes information from opto-coupled feedback and an auxiliary flyback winding for high-performance control of output voltage and current.

The UCC28742 employs advanced control algorithms to achieve high operating efficiency and performance. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. A minimum switching frequency of 200 Hz facilitates the achievement of low no-load input power.

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Technische Dokumentation

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Top-Dokumentation	Typ	Titel	Format-Optionen	Datum
*	Datenblatt	UCC28742 High-Efficiency Flyback Controller with Optocoupler Feedback datasheet (Rev. A)	PDF \| HTML	08.05.2018
	Technischer Artikel	Snubbing the flyback converter	PDF \| HTML	26.02.2024
	Technischer Artikel	Adding a single capacitor to improve cross-regulation in dual-output flyback power supplies	PDF \| HTML	21.12.2023
	Application brief	Flyback Selection Guide	PDF \| HTML	23.06.2022
	Anwendungshinweis	Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips	PDF \| HTML	31.08.2021
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	Anwendungshinweis	Minimize Standby Consumption for UCC287XX Family		01.08.2019
	Technischer Artikel	Choosing the right flyback controller for your design	PDF \| HTML	24.08.2018
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Design und Entwicklung

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Evaluierungsplatine

UCC28742EVM-001 — UCC28742 10-W-AC/DC-Wandler – Evaluierungsmodul

Das UCC28742EVM-001 ist ein 10-W-Evaluierungsmodul zur Evaluierung eines Offline-Adapters für USB-Anwendungen. Das EVM erfüllt die Anforderungen an Effizienz und Standby-Leistung von CoC Tier 2 und DoE Level 6. Es ist für Evaluierungszwecke und nicht als Endprodukt gedacht. Der UCC28742EVM-001 (...)

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