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LTC3901 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3901 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC3901 1 3901f ■ N-Channel Synchronous MOSFET Driver ■ Programmable Timeout ■ Reverse Inductor Current Sense ■ Gate Drive Transformer Synchronization Sequence Monitor ■ Wide VCC Supply Range: 4.5V to 11V ■ 15ns Rise/Fall Times at VCC = 5V, CL = 4700pF ■ Undervoltage Lockout ■ Small 16-Lead SSOP Package Secondary Side Synchronous Driver for Push-Pull and Full-Bridge Converters The LTC ®3901 is a secondary side synchronous rectifier driver designed to be used in isolated push-pull and full- bridge converter power supplies. The chip drives two external N-channel MOSFETs and accepts a transformer- generated bipolar input to maintain sychronization with the primary side controller. The LTC3901 provides a full range of protection features for the external MOSFETs. A programmable timeout func- tion is included that disables both drivers when the syn- chronization signal is missing or incorrect. Additionally, the chip senses the output inductor current through the drain-source resistance of the two MOSFETs, turning off the MOSFETs if the inductor current reverses. The LTC3901 also shuts off the drivers if the supply is low or if the synchronization sequence is incorrect. Figure 1. Simplified Isolated Push-Pull Converter LTC3723 PUSH-PULL CONTROLLER LT4430 OR LT1431 OPTOCOUPLER DRIVER DRVA DRVB COMP VFB SDRB SDRA ISOLATION BARRIER T1 L1 CSE+ ME CSE– CSF+ MF CSF– VCC GND PVCC PGND LTC3901 OUT T2 MA MB ME MF COMP VOUT 12V COUT VIN 36V TO 72V 3901 F01 + FB SYNC TIMER ■ 48V Input Isolated DC/DC Converters ■ Isolated Telecom Power Supplies ■ Distributed Power Step-Down Converters ■ Industrial Control System Power Supplies ■ Automotive and Heavy Equipment DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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