40V Micropower No-Opto Isolated Flyback Converter with 60V/3.4A Switch

The ADPL54203 operates from an input voltage range of 3.2V to 40V and delivers up to 17W of isolated output power. It is a monolithic micropower isolated flyback converter. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no third winding or optoisolator for regulation. The output voltage is programmed with two external resistors and a third optional temperature compensation resistor. Boundary mode operation provides a small magnetic solution with excellent load regulation. Low ripple Burst Mode operation maintains high efficiency at light load while minimizing the output voltage ripple.

A 3.4A, 60V DMOS power switch is integrated along with all the high voltage circuitry and control logic into a thermally enhanced 8-lead SO package. The high level of integration and the use of boundary and low ripple burst modes result in a simple to use, low component count, and high efficiency application solution for isolated power delivery.

APPLICATIONS

* Isolated Auxiliary/Housekeeping Power Supplies

*  Isolated Industrial, Medical Power Supplies

* 3.4A, 60V Internal DMOS Power Switch

* 3.2V to 40V Input Voltage Range

* No Transformer Third Winding or Opto-Isolator Required for Output Voltage Regulation

* Quasi-Resonant Boundary Mode Operation at Heavy Load

* Low Ripple Burst Mode® Operation at Light Load

* Low Quiescent Current

* 115μA in Sleep Mode

* 390μA in Active Mode

* Minimum Load < 0.5% (Typ) of Full Output

* Temperature Compensation for Output Diode

* Internal Compensation and Soft-Start

* Output Short-Circuit Protection

* Accurate EN/UVLO Threshold and Hysteresis

* Thermally Enhanced 8-Lead SO Package