See datasheet for actual packaging/pinout drawings

Packaging

Package | PIN:

DBV | 6

Temp:

Q (-40 to 125)

ECO Plan:

TBD

PUCC28742DBVR


High-Efficiency Flyback Controller With Optocoupler Feedback

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Texas Instruments PUCC28742DBVR

The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-side regulated PWM controller for high 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 operational switching frequency of 65 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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