peculiarity
Current mode control
Internal 100V start-up bias regulator
3A composite main door driver
High bandwidth optocoupler interface
Programmable Line Adjustable Hysteresis Undervoltage Lockout (UVLO)
Universal dual-mode overcurrent protection hiccup delay timer
Programmable primary and active clamped outputs between overlap or dead bands
Programmable maximum duty cycle clamp
Programmable soft-start
Cutting-edge blanking
Resistor-set 1MHz capable oscillator
Oscillator synchronous I/O capability
Precision 5V reference
illustrate
The LM5026 PWM controller contains all the necessary functions to implement the power converter, utilizing active clamp/reset technology for current mode control. Active clamping technology, higher efficiency and greater power density, enables clamping/reset techniques compared to traditional catch-up winding or RDC techniques. Two control outputs are available, main power switch control (OUT_A) and active clamp switch control (OUT_B). The device can be configured to control either P-channel or N-channel clamp switches. A composite configuration of the front gate driver function, including two MOS bipolar devices, provides excellent gate drive characteristics. The LM5026 can be configured to operate with a wide input range with bias voltages over 8V to 100V. Other features include programmable maximum duty cycle, line undervoltage lockout, cycle-by-cycle current limit, hiccup mode fault operation with adjustable timeout delay, PWM slope compensation, soft-start, 1MHz capability oscillator synchronous input/output capability, accurate reference, and thermal shutdown.