The LM25180 is a 42Vin Opticless Flyback Converter with 65V, 1.5A Integrated MOSFET
The LM25180 is a primary-side regulated (PSR) flyback converter with high efficiency over a wide input voltage range of 4.5V to 42V. The isolated output voltage is sampled from the primary-side flyback voltage without the need for an optocoupler, voltage reference, or tertiary winding from the AD5392BCPZ-3 transformer for output voltage regulation.
The high level of integration enables a simple, reliable and high-density design with only one component passing through the isolation barrier. Boundary Conduction Mode (BCM) switches enable compact magnetic solutions and better than ±1.5% load and line regulation. An integrated 65V power MOSFET delivers up to 7W of output power with enhanced headroom for line transients.
The LM25180 flyback converter is available in an 8-pin, 4mm × 4mm, thermally enhanced WSON package with 0.8mm lead pitch.
The LM25180 flyback converter simplifies the implementation of isolated DC/DC power supplies and has optional features to optimize the performance of the target end equipment. The output voltage is set by a resistor, and an optional resistor improves output voltage accuracy by canceling the thermal coefficient of the flyback diode drop. Additional features include internally fixed or externally programmable soft-start, optional bias supply connection for improved efficiency, precision enable input with hysteresis for adjustable line UVLO, hiccup mode overload protection, and thermal with automatic recovery Shutdown protection.
characteristic:
●Designed for reliable and rugged applications
○Wide input voltage range of 4.5 V to 42 V, operating down to 3.5 V after startup
○ Robust solution where only one component crosses the isolation barrier
○±1.5% total output adjustment accuracy
○ Optional V OUT temperature compensation
○6ms internal or programmable soft-start
○Input UVLO and thermal shutdown protection
○Hiccup mode overcurrent fault protection
○–40°C to +150°C Junction Temperature Range
● Integration reduces solution size and cost
○Integrated 65V, 0.4Ω power MOSFET
○ V OUT regulation requires no optocoupler or transformer auxiliary winding
○Internal loop compensation
●Efficient PSR flyback operation
○ Quasi-resonant MOSFET in BCM turns off
○ Low input quiescent current
○ External bias option for increased efficiency
○Single output and multiple output implementation
●Ultra low conducted and radiated EMI characteristics
○ Soft switching avoids diode reverse recovery
○Optimized for CISPR 32 EMI requirements
●Create custom regulator designs with WEBENCH® Power Designer
application:
●Isolated field transmitter and field actuator
●Multiple output rails for analog input modules
Motor drive: IGBT and SiC gate drive power supply
●Building automation HVAC system
●Isolated bias supply
parameter:
Input Voltage (Max) (V): 42
Input Voltage (Min) (V): 4.5
Output (Max) (A): 1.5
Features: UVLO adjustable, enable, integrated switch, light load efficiency, pre-bias start-up
Operating temperature range (°C): -40 to 150
Adjust output (#): 1
Packaging Type: WSON
TI Functional Safety Category: Functional Safety Capability
◆ Typical application of LM25180
◆LM25180 functional block diagram