Linear technology release the LTC3803-3 constant frequency current mode flyback controller optimized for driving 6V-rated 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.
The LTC3803-3 provides ±1.5% output voltage accuracy and consumes only 240μA of quiescent current.
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 9.4V shunt regulator .
When the input voltage falls below 4V an internal undervoltage lockout shuts down the LTC3803-3 circuit .
LTC3803-3 chip can be used in many applications like : Telecom Power Supplies , 42V and 12V Automotive Power Supplies , Auxiliary/Housekeeping Power Supplies , Power Over Ethernet Powered Devices .
Main features of the LTC3803-3 chip are : VIN and VOUT Limited Only by External Components , Adjustable Slope Compensation , Internal Soft-Start , –40°C to 150°C Operating Temperature Range , Constant Frequency 300kHz Operation , ±1.5% Reference Accuracy , Current Mode Operation for Excellent Line and Load Transient Response , No Minimum Load Requirement , Low Quiescent Current: 240μA