●The LM5025B is a functional variant of the LM5025 active clamp PWM controller. The functional differences of the LM5025B are as follows:
● The maximum PWM duty cycle is limited to less than 75% to reduce voltage stress on the power MOSFETs.
● The CS2 hiccup mode threshold is increased to 0.5V
● The CS2 filter discharge device is disabled
● The VCC regulator continues to operate when the line UVLO is below the threshold of normal operation
● The VREF regulator is switched off when the line UVLO input falls below the operating threshold
● The internal 5kΩ COMP pin pull-up resistor is removed
●The LM5025B PWM controller contains all of the features necessary to implement power converters utilizing the Active Clamp / Reset technique. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp / reset techniques. Two control outputs are provided, the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The two internal compound gate drivers parallel both MOS and Bipolar devices, providing superior gate drive characteristics. This controller is designed for high-speed operation including an oscillator frequency range up to 1MHz and total PWM and current sense propagation delays less than 100ns.
●The LM5025B includes a high-voltage start-up regulator that operates over a wide input range of 13V to 100V. Additional features include: Line Under Voltage Lockout (UVLO), softstart, oscillator UP/DOWN sync capability, precision reference and thermal shutdown.
● Internal Start-Up Bias Regulator
● 3A Compound Main Gate Driver
● Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis
● Voltage Mode Control with Feed-Forward
● Adjustable Dual Mode Over-Current Protection
● Programmable Overlap or Deadtime between the Main and Active Clamp Outputs
● Volt x Second Maximum Duty Cycle Clamp
● Programmable Soft-Start
● Current Sense Leading Edge Blanking
● Single Resistor Programmable Oscillator
● Oscillator Up / Down Sync Capability
● Precision 5V Reference
● Thermal Shutdown
●## Packages
● TSSOP-16
● WSON-16 (5x5 mm) Thermally Enhanced
●All trademarks are the property of their respective owners.
Part 3D Model
