UCC28742DBVT

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Texas Instruments

HIGH-EFFICIENCY FLYBACK CONTROLLER WITH 1% OUTPUT REGULATION ACCURACY

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DocumentsSnubbing the flyback converter Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips +12

UCC28742DBVT

Active

Texas Instruments

HIGH-EFFICIENCY FLYBACK CONTROLLER WITH 1% OUTPUT REGULATION ACCURACY

Deep-Dive with AI

DocumentsSnubbing the flyback converter Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips +12

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	UCC28742DBVT

Duty Cycle	99 %
Fault Protection	Short Circuit, Current Limiting, Over Voltage
Frequency - Switching	80 kHz
Internal Switch(s)	False
Mounting Type	Surface Mount
Operating Temperature [Max]	125 °C
Operating Temperature [Min]	-40 °C
Output Isolation	Isolated
Package / Case	SOT-23-6
Supplier Device Package	SOT-23-6
Topology	Flyback
Voltage - Start Up	21.6 V
Voltage - Supply (Vcc/Vdd) [Max]	35 V
Voltage - Supply (Vcc/Vdd) [Min]	9 V

UCC28742 Series

Part	Voltage - Output	Supplied Contents	Outputs and Type	Outputs and Type	Main Purpose	Board Type	Voltage - Input [Min]	Voltage - Input [Max]	Current - Output	Regulator Topology	Output Isolation	Frequency - Switching	Package / Case	Mounting Type	Voltage - Start Up	Topology	Duty Cycle	Supplier Device Package	Fault Protection	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Operating Temperature [Max]	Operating Temperature [Min]
Texas Instruments UCC28742EVM-001	5 V	Board(s)	Non-Isolated	1	AC/DC Primary Side	Fully Populated	85 VAC	265 VAC	2 A	Flyback
Texas Instruments UCC28742DBVR											Isolated	80 kHz	SOT-23-6	Surface Mount	21.6 V	Flyback	99 %	SOT-23-6	Current Limiting Over Voltage Short Circuit	35 V	9 V	125 °C	-40 °C
Texas Instruments UCC28742DBVT											Isolated	80 kHz	SOT-23-6	Surface Mount	21.6 V	Flyback	99 %	SOT-23-6	Current Limiting Over Voltage Short Circuit	35 V	9 V	125 °C	-40 °C

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 0.97
		10	$ 0.86
		25	$ 0.82
		100	$ 0.67
	Digi-Reel®	1	$ 0.97
		10	$ 0.86
		25	$ 0.82
		100	$ 0.67
	Tape & Reel (TR)	250	$ 0.44
		500	$ 0.39
		1250	$ 0.36
Texas Instruments	SMALL T&R	1	$ 0.72
		100	$ 0.55
		250	$ 0.41
		1000	$ 0.29

Description

General part information

UCC28742 Series

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.