(Hong Kong)
Product Summary
The LTC1698EGN#TR is a precision secondary-side forward converter controller that synchronously drives external N-channel MOSFETs. It is designed for use with the LTC1698EGN#TR primary-side synchronous forward converter controller to create a completely isolated power supply. The LT3781 synchronizes the LTC1698EGN#TR through a small pulse transformer and the LTC1698EGN#TR 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 LTC1698EGN#TR 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. Applications are 48V input isolated dc/dc converters, isolated telecommunication power systems, distributed power step-down converters, industrial control systems, automotive and heavy equipment.
Parametrics
LTC1698EGN#TR absolute maximum ratings: (1)VDD, PWRGD : 13.2V; (2)Input Voltage MARGIN, VFB, OVPIN, ISNSGND, ISNS : – 0.3V to 5.3V, SYNC : – 14V to 14V; (3)Output Voltage VCOMP, ICOMP: – 0.3V to 5.3V; (4)Power Dissipation : 500mW; (5)Operating Temperature Range: – 40℃ to 85℃; (6)Storage Temperature Range : –65℃ to 150℃; (7)Lead Temperature (Soldering, 10 sec): 300℃.
Features
LTC1698EGN#TR features: (1)High Efficiency Over Wide Load Current Range; (2)±0.8% Output Voltage Accuracy; (3)Dual N-Channel MOSFET Synchronous Drivers; (4)Pulse Transformer Synchronization; (5)Optocoupler Feedback Driver; (6)Programmable Current Limit Protection; (7)±5% MargiOutput Voltage Adjustment; (8)Adjustable Overvoltage Fault Protection; (9)Power Good Flag; (10)Auxiliary 3.3V Logic Supply; (11)Available i16-Lead SSOP and SO Packages.
Diagrams
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IC REG CTRLR ISO PWM CM 16-SSOP |
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LTC1698EGN#TRPBF |
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IC REG CTRLR ISO PWM CM 16-SSOP |
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