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Product Detailed Parameters
- Description：IC REG CTRLR FLYBACK 16SSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Output Type：Transistor Driver
- Function：Step-Up/Step-Down
- Output Configuration：Positive or Negative, Isolation Capable
- Topology：Flyback
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：9.7V ~ 22V
- Frequency - Switching：90kHz ~ 115kHz
- Duty Cycle (Max)：90%
- Synchronous Rectifier：No
- Clock Sync：No
- Serial Interfaces：-
- Control Features：Enable, Soft Start
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：16-SSOP (0.154", 3.90mm Width)
- Supplier Device Package：16-SSOP
- Grade：-
- Qualification：-
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Overview
The LT1725IGN#PBF is a monolithic switching regulator controller designed for isolated flyback topologies. It drives an external MOSFET gate, typically powered by a third transformer winding. Key parameters include a switch frequency range of 90 kHz to 115 kHz and a maximum duty cycle of 90%. The device supports positive or negative outputs with isolation capability. Operating voltage ranges from 9.7 V to 22 V, with a supply current of 10 mA. It operates within a temperature range of -40°C to +125°C TJ. The component is housed in a 16-SSOP package.
Feature Summary
- Specifically engineered for isolated flyback converter applications
- Provides enable control and soft-start functionality
- Drives external MOSFET gates directly
- Supports step-up and step-down DC-DC conversion
Applications
- Isolated power supplies
- General purpose flyback converters
- Industrial control systems
- Telecommunications equipment
Procurement Notes
Verify the specific suffix against official Analog Devices documentation to confirm package type and tape/reel specifications. Ensure compatibility with required thermal management solutions given the SSOP form factor. Confirm RoHS compliance status through the manufacturer's latest material declaration. Cross-reference ordering part numbers to avoid confusion between tube and reel packaging variants.
Selection Notes
Select this controller when designing isolated flyback converters requiring precise duty cycle control. Consider the 90 kHz to 115 kHz operating frequency range for magnetic component sizing. Evaluate the 9.7 V to 22 V supply voltage window against available auxiliary windings. Assess thermal performance requirements within the -40°C to +125°C junction temperature limits for the target application environment.
Part Context
The LT1725 series represents Analog Devices' solution for general-purpose isolated flyback control. This family simplifies design by integrating essential control loops into a single monolithic IC. The IGN variant specifically denotes the industrial-grade temperature range and SSOP packaging option, distinguishing it from other pinout or package configurations within the broader LT1725 product line.
Replacement Considerations
LT1725IS#PBF
FAQ
How is the LT1725IGN#PBF typically powered?
It is generally powered by a third transformer winding in isolated flyback topologies.
What control features are integrated into the device?
The controller includes enable functionality and a built-in soft-start circuit.
