LTC3900 - Synchronous Rectifier Driver for Forward Converters
The LTC®3900 is a secondary-side synchronous rectifier driver designed to be used in isolated forward converter power supplies. The chip drives N-channel rectifier MOSFETs and accepts pulse sychronization from the primary-side controller via a pulse transformer.
The LTC3900 incorporates a full range of protection for the external MOSFETs. A programmable timeout function is included that disables both drivers when the synchronization signal is missing or incorrect. Additionally, the chip senses the output inductor current through the drainsource resistance of the catch MOSFET, shutting off the MOSFET if the inductor current reverses. The LTC3900 also shuts off the drivers if the supply voltage is too low.
Features
Typical Application  | Applications
Packaging |
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LTC3900ES8#PBF | SO-8 | E | $3.57 | $2.50 |
| LTC3900ES8#TRPBF | SO-8 | E | $2.56 | |
| LTC3900HS8#PBF | SO-8 | H | $4.11 | $2.88 |
| LTC3900HS8#TRPBF | SO-8 | H | $2.94 | |
| LTC3900IS8#PBF | SO-8 | I | $3.70 | $2.59 |
| LTC3900IS8#TRPBF | SO-8 | I | $2.65 | |
| LTC3900MPS8#PBF | SO-8 | MP | $10.00 | $7.00 |
| LTC3900MPS8#TRPBF | SO-8 | MP | $7.06 |
Demo Boards
| Part Number | Description | Price |
|---|---|---|
| DC1317A-C | LT1952EGN-1/LTC3900 Demo Board | Active Reset, Vin=18V-72V Vout=12V @ 10A | $175.00 |
| DC1317A-G | LT1952EGN-1/LTC3900 Demo Board | Active Reset, Vin=9V-36V Vout=12V @ 5A | $175.00 |
| DC677A | LT1952-1EGN-1, LTC3900ES Demo Board | Vin=36V-75V, Vout=3.3V @ 50A | Contact Factory |
| DC968A-A | LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | Vin=34V-75V Vout=3.3V @ 30A | $150.00 |
| DC968A-B | LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | Vin=18V-36V, Vout=5V @ 20A | $175.00 |
| DC968A-C | LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | Vin=36V-75V, Vout=12V @ 12A | $150.00 |
| DC968A-D | LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | Vin=36V-75V, Vout=28V @ 4A | $175.00 |
- 隔离式正向转换器集成电路规定在 -55°C 至 125°C 的节温范围内工作
- R368 Reliability Data
- March 2005 - Efficient and Reliable Drive for Synchronous MOSFET Rectifiers
- Isolated Forward Converter Integrated Circuits Specified over -55°C to 125°C Junction Temperature Range
- LTC3900 Footprints and Symbols
- LT1952/LTC3900 Demo Circuit - Synchronous Forward Converter (36-75V to 3.3V @ 20A)
