The LTC3803-3 is a constant frequency current mode flyback controller optimized for driving N-channel MOSFETs in high input voltage applications. Constant frequency operation is maintained down to very light loads, resulting in less low frequency noise generation over a wide range of load currents. Slope compensation can be programmed with an external resistor. The LTC3803-3 provides ±1.5% output voltage accuracy and consumes only 240μA of quiescent current. Ground referenced current sensing allows LTC3803-3-based converters to accept input supplies beyond the LTC3803-3’s absolute maximum VCC. A micropower hysteretic start-up feature allows efficient operation at high input voltages. For simplicity, the LTC3803-3 can also be powered from a high VIN through a resistor, due to its internal shunt regulator. An internal undervoltage lockout shuts down the LTC3803-3 when the input voltage is too low to provide sufficient gate drive to the external MOSFET. The LTC3803-3 is available in a low profile (1mm) 6-lead SOT-23 (ThinSOT™) package. Turn On Voltage Frequency LTC3803 8.7V 200kHz LTC3803-3 8.7V 300kHz LTC3803-5 4.8V 200kHz Applications * Telecom Power Supplies * 42V and 12V Automotive Power Supplies * Auxiliary/Housekeeping Power Supplies * Power over Ethernet Powered Devices * VIN and VOUT Limited Only by External Components * Adjustable Slope Compensation * Internal Soft-Start * –55°C to 150°C Operating Temperature Range * Constant Frequency 300kHz Operation https://elecena.pl/product/259756/constant-frequency-current-mode-flyback-dc-dc-controller-in-thinsot 2007-03-04 https://elecena.pl/product/259756/constant-frequency-current-mode-flyback-dc-dc-controller-in-thinsot 2017-10-10 https://elecena.pl/product/259756/constant-frequency-current-mode-flyback-dc-dc-controller-in-thinsot 2025-01-22