Power Management
Switching Regulator
Flyback, Forward and Isolated Controllers
Space & Harsh Environment
Extended Temperature Plastic (H & MP)
Extended Temperature (H & MP) Switching Regulators
LTC3765 - Active Clamp Forward Controller and Gate Driver
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
Typical Application
Description
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.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
MS-16
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LTC3765EMSE#PBF | MSOP | 16 | E | $3.66 | $2.56 | View |
| LTC3765EMSE#TRPBF | MSOP | 16 | E | $2.62 | View | |
| LTC3765HMSE#PBF | MSOP | 16 | H | $4.50 | $3.15 | View |
| LTC3765HMSE#TRPBF | MSOP | 16 | H | $3.21 | View | |
| LTC3765IMSE#PBF | MSOP | 16 | I | $4.04 | $2.83 | View |
| LTC3765IMSE#TRPBF | MSOP | 16 | I | $2.89 | View | |
| LTC3765MPMSE#PBF | MSOP | 16 | MP | $11.03 | $7.72 | View |
| LTC3765MPMSE#TRPBF | MSOP | 16 | MP | $7.78 | View | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1739A | OBSOLETE - PLEASE USE DC1739A-B | Contact Factory | |
| DC1739A-B | LTC3765EMSE/LTC3766EGN Demo Board 18V VIN 72V; VOUT = 12V @ 12.5A | Contact Factory | |
| Buy Now | |||
Applications
- Isolated Battery Chargers
- Isolated 48V Telecommunication Systems
- Servers and Embedded Computing
- Automotive and Heavy Equipment
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Simulate
LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.
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Related models available in LTspice IV
LTC3765
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
