Product Summary

The LTC?3765 is a start-up controller and gate driver for use in a self-starting secondary-side control forward converter. When combined with the LTC3766 secondaryside 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. The LTC3765 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.

The LTC3765 includes an active clamp output for driving an external PMOS, as well as an adjustable delay to optimize efficiency. The active clamp architecture reduces voltage stress on the main power switch, and provides the highest possible efficiency. Overcurrent protection and the Direct Flux Limit guarantee no transformer saturation without compromising transient response.



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Features

Supports Self-Starting Secondary-Side Control
Direct Flux Limit? Guarantees No Saturation
Active Clamp Drive with Delay Adjustment
On-Chip Bridge Rectifier Eliminates Need for Separate Gate Drive Bias Supply
Wide Input Supply Range: 8V and Up (Limited Only by External Components)
Linear Regulator Controller for Fast Start-Up
High Speed Gate Drivers
Precision UVLO with Adjustable Hysteresis
Overcurrent Protection
Overtemperature Protection
Adjustable Start-Up Frequency and Soft-Start
Tiny 16-Lead MSOP Package

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
LTC3765IMSE#TRPBF
LTC3765IMSE#TRPBF


IC CONTROLLER GATE DR 16MSOP

Data Sheet

0-2500: $2.09
Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
LTC3025
LTC3025

Other


Data Sheet

Negotiable 
LTC3025EDC#TR
LTC3025EDC#TR


IC REG LDO ADJ .3A 6DFN

Data Sheet

0-5000: $0.88
LTC3025EDC#TRM
LTC3025EDC#TRM


IC REG LDO ADJ .3A 6DFN

Data Sheet

0-5000: $0.88
LTC3025EDC#TRMPBF
LTC3025EDC#TRMPBF


IC REG LDO ADJ .3A 6DFN

Data Sheet

0-1000: $0.88
LTC3025EDC#TRPBF
LTC3025EDC#TRPBF


IC REG LDO ADJ .3A 6DFN

Data Sheet

0-2500: $0.88
LTC3025EDC-1#TRMPBF
LTC3025EDC-1#TRMPBF


IC REG LDO ADJ .5A 6DFN

Data Sheet

0-1000: $0.97