LTC3765IMSE#PBF

LTC3765 is a start-up controller and gate driver for use in a self-starting secondary-side control forward converter. When combined with the LTC3766 secondary-side synchronous forward controller, a complete isolated power supply is created using a minimum of discrete parts. A proprietary scheme is used to multiplex gate drive signals and bias power across the isolation barrier through a small pulse transformer. It contains an on chip bridge rectifier that extracts gate drive bias power from this pulse transformer, eliminating the need for a separate bias supply. A precision undervoltage lockout circuit and linear regulator controller ensure a quick and well-controlled start-up. It includes an active clamp output for driving an external PMOS, as well as an adjustable delay to optimize efficiency. It is used in applications such as isolated battery chargers, isolated 48V telecommunication systems, servers and embedded computing, automotive and heavy equipment etc.

• On-chip bridge rectifier eliminates need for separate gate drive bias supply
• Linear regulator controller for fast start-up
• Precision UVLO with adjustable hysteresis
• Overtemperature protection
• Adjustable start-up frequency and soft-start
• Operating voltage range is 7.7V to 14.5V
• DC supply current is 1.7mA typ at (VRUN = 1.5V, TA = 25°C, VCC = 12V)
• Oscillator frequency is 75KHz typical at (RFS = 75Kohm, TA = 25°C, VCC = 12V)
• Operating temperature is -40°C to 125°C
• Package style is 16-lead plastic MSOP

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