Analog Devices Inc. LT8316 Demo Board DC2793A is an evaluation board featuring a high VIN no-opto synchronous flyback converter example circuit based on the LT8316 600VIN Isolated Flyback Controller. The DC2793A outputs 5V and maintains tight regulation with a load current from 70mA to 7A. The evaluation board is optimized to operate over a wide 140V to 450V DC input voltage range. Output voltage accuracy stays within ±5% over the entire input voltage and load range. A secondary side LT8309 Synchronous Rectifier Driver is also on-board to sense the synchronous MOSFET drain-to-source voltage and determine its turn-on period. The standby mode of the LT8316 can be easily enabled and disabled by jumper settings, reducing the minimum switching frequency to 220Hz for ultra-low quiescent power consumption.
Input Supply Range (VIN): 140V to 450V
Output Voltage Range (VOUT): 4.75V to 5.25V, 5.0V typical
Maximum Output Current (IOUT): 7A
Output Voltage AC Ripple (Peak-to-Peak)
@ VIN = 140V, IOUT = 7A: 80mVP-P
@ VIN = 450V, IOUT = 7A: 20mVP-P
Typical Switching Frequency (fSW)
@ VIN = 140V, IOUT = 7A: 45kHz
@ VIN = 450V, IOUT = 7A: 475kHz
@ VIN = 140V, IOUT = 7A: 89%
@ VIN = 450V, IOUT = 7A: 88%
Analog Devices Inc. LT8316 Micropower Isolated Flyback Converters
Sample output voltage from isolated flyback waveforms that appear on third-winding transformers.