The LM5025 PWM controller contains all of the features necessary to implement power converters using the active clamp and reset technique. The device can be configured to control either a P-channel clamp switch or an N-channel clamp switch. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp and reset techniques.
●Two control outputs are provided, the main power switch control (OUT_A), and the active clamp switch control (OUT_B). The active clamp output can be configured for either a specified overlap time (for P-channel switch applications) or a specified deadtime (for N_channel applications). 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 1 MHz and total PWM and current sense propagation delays less than 100 ns.
●The LM5025 includes a high-voltage start-up regulator that operates over a wide input range of 13 V to 90 V. Additional features include: line undervoltage lockout (UVLO), soft-start, oscillator UP and DOWN sync capability, precision reference and thermal shutdown.
● Internal Start-Up Bias Regulator
● 3-A Compound Main Gate Driver
● Programmable Line Undervoltage Lockout (UVLO)
●With Adjustable Hysteresis
● Voltage Mode Control With Feed-Forward
● Adjustable Dual-Mode Overcurrent Protection
● Programmable Overlap or Deadtime Between the
●Main and Active Clamp Outputs
● Volt × Second Clamp
● Programmable Soft-Start
● Leading Edge Blanking
● Single Resistor Programmable Oscillator
● Oscillator UP and DOWN Sync Capability
● Precision 5-V Reference
● Thermal Shutdown
