Analog Devices Inc. LT8306 is a micropower isolated flyback controller in a six-lead ThinSOT package. By sampling the isolated output voltage directly from the primary side flyback waveform, the part requires no third winding or opto-isolator for regulation. The output voltage is programmed with a single external resistor.
The EVAL-LT8306-AZ evaluation circuit demonstrates the features of the LT8306 micro-powered no-opto-isolated flyback converter. The EVAL-LT8306-AZ outputs 12 V, and holds tight regulation with a load current from 15 mA to 2,0 A over an input voltage from 6 to 36 V. The output current capacity increases with the input voltage.
The ADI EVAL-LT8306-AZ requires a minimum load (15 mA) to regulate the output voltage because of the LT8306 ultra-low switching frequency at a very light load. A 13 V Zener diode is positioned between the VOUT+ and VOUT- pins to limit the output voltage and avoid preloading under a no-load condition.
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