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Product Detailed Parameters
- Description：IC REG CTRLR FWRD CONV 20SSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- Output Type：Transistor Driver
- Function：Step-Up/Step-Down
- Output Configuration：Positive, Isolation Capable
- Topology：Forward Converter
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：9V ~ 18V
- Frequency - Switching：700kHz
- Duty Cycle (Max)：-
- Synchronous Rectifier：No
- Clock Sync：Yes
- Serial Interfaces：-
- Control Features：Enable, Soft Start
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：20-SSOP (0.209", 5.30mm Width)
- Supplier Device Package：20-SSOP
- Grade：-
- Qualification：-
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Overview
The LT3781EG#TRPBF is a switching voltage regulator controller designed for high-power synchronous dual transistor forward DC/DC converters. It employs fixed frequency current mode control to simplify design complexity. The device supports an adjustable output voltage and delivers up to 20 A of output current. It operates at a switching frequency of 350 kHz and accepts an input voltage range of 36 V to 72 V. The component functions within an operating temperature range of -40°C to +85°C and is housed in a 20-lead SSOP package.
Feature Summary
- Synchronous dual transistor forward topology with bootstrap start capability
- Fixed frequency current mode control architecture
- Integrated enable and soft start control features
Applications
- High power synchronous forward DC/DC converter designs
- Industrial power supply systems
- Telecommunications equipment power stages
Procurement Notes
Verify the specific suffix designation against official Analog Devices documentation to confirm tape and reel packaging requirements. Ensure that the selected variant matches the required thermal performance and electrical specifications for the target application environment. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and traceability before finalizing procurement orders.
Selection Notes
Select this controller when designing isolated forward converters requiring high efficiency and precise current regulation. The component is suitable for applications demanding a wide input voltage range and robust thermal operation. Consider the 350 kHz switching frequency for optimal transformer size and efficiency balance. Ensure external MOSFETs are rated for the expected peak currents and voltage stresses associated with the forward topology.
Part Context
The LT3781 series simplifies the design of high-power synchronous forward converters by integrating necessary control logic into a single monolithic IC. This family of controllers supports both standard and bootstrap start configurations, offering flexibility in gate drive implementation. The EG#TRPBF variant specifically denotes the commercial temperature grade version packaged in a tape and reel format for automated surface mount assembly processes.
Replacement Considerations
Public confirmed substitute part numbers include LT3781IG#PBF and LT3781EG#PBF. Verify pin compatibility and thermal characteristics when substituting between these variants.
