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LTC1698IGN Datasheet(PDF) 1 Page - Linear Technology |
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LTC1698IGN Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC1698 1698f APPLICATIO S DESCRIPTIO FEATURES TYPICAL APPLICATIO The LTC ®1698 is a precision secondary-side forward converter controller that synchronously drives external N-channel MOSFETs. It is designed for use with the LT ®3781 primary-side synchronous forward converter controller to create a completely isolated power supply. The LT3781 synchronizes the LTC1698 through a small pulse transformer and the LTC1698 drives a feedback optocoupler to close the feedback loop. Output accuracy of ±0.8% and high efficiency over a wide range of load currents are obtained. The LTC1698 provides accurate secondary-side current limit using an external current sense resistor. The input voltage at the MARGIN pin provides ±5% output voltage adjustment. A power good flag and overvoltage input are provided to ensure proper power supply conditions. An auxiliary 3.3V logic supply is included that supplies up to 10mA of output current. Isolated Secondary Synchronous Rectifier Controller s High Efficiency Over Wide Load Current Range s ±0.8% Output Voltage Accuracy s Dual N-Channel MOSFET Synchronous Drivers s Pulse Transformer Synchronization s Optocoupler Feedback Driver s Programmable Current Limit Protection s ±5% Margin Output Voltage Adjustment s Adjustable Overvoltage Fault Protection s Power Good Flag s Auxiliary 3.3V Logic Supply s Available in 16-Lead SSOP and SO Packages s 48V Input Isolated DC/DC Converters s Isolated Telecommunication Power Systems s Distributed Power Step-Down Converters s Industrial Control Systems s Automotive and Heavy Equipment Figure 1. Simplified 2-Transistor Isolated Forward Converter , LTC and LT are registered trademarks of Linear Technology Corporation. + + CG VDD PWRGD LTC1698 PGND GND 28 CFB CC CCILM RC VOUT RCILM R2 R5 R4 R1 L1 6 13 9 7 14 COUT 110 Q4 VIN 36V to 72V Q3 T1 Q1 D1 Q2 RPRISEN T2 FG 16 ISNS RSECSEN 12 ISNSGND 11 SYNC VFB VCOMP VAUX ICOMP OVPIN MARGIN VMARGIN O.1 µF 1681 F01 VAUX 3.3V 10mA 15 OPTODRV PLEASE REFER TO FIGURE 12 IN THE TYPICAL APPLICATIONS SECTION FOR THE COMPLETE 3.3V/15A APPLICATION SCHEMATIC 5 34 RSYNC RK RE ISOLATION BOUNDARY RF REF VFB SG TG BG LT3781 VC CSYNC CK CF VDD BIAS CSG + – D2 |
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