Texas Instruments UCC28742DBVR
Part Number:
- UCC28742DBVR
Manufacturer:
- Texas Instruments
Ventron No:
- 6401674-UCC28742DBVR
Description:
- High-Efficiency Flyback Controller with 1% Output regulation accuracy
Datasheet:
- UCC28742DBVR
Payment:
Delivery:
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Specifications
Texas Instruments UCC28742DBVR technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments UCC28742DBVR.
- TopologyFlyback
- Control modeSecondary-side regulation
- Duty cycle (max) (%)99
- Switching frequency (max) (kHz)105
- FeaturesCurrent limiting
- UVLO thresholds on/off (V)22/7.7
- Operating temperature range (°C)-40 to 125
- RatingCatalog
- Gate drive (typ) (A)0.03
Description
The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-sideregulated PWM controller for efficient AC-to-DC power supplies. It is an isolated-flybackpower-supply controller that provides Constant-Voltage (CV) using an optical coupler to improvetransient response to large-load steps. This device processes information from opto-coupledfeedback and an auxiliary flyback winding for high-performance control of output voltage andcurrent.
The UCC28742 employs advanced control algorithms to achieve high operating efficiency andperformance. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode(DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primarycurrent-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load andline ranges.
The controller has a maximum switching frequency of 80 kHz and always maintains controlof the peak-primary current in the transformer. A minimum switching frequency of 200 Hz facilitatesthe achievement of low no-load input power.
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