This detailed section contains an in-depth explanation of the numerous PWM functions, and how to maximize their usefulness. It covers a multitude of practical circuit design considerations, such as slope compensation, gate drive circuitry, external control functions, synchronization, and paralleling current mode controlled modules. Circuit diagrams and simplified equations for the above items of interest
are included. Familiarity with these topics will simplify the design and debugging process, and will save a great deal of time for the power supply design engineer.

for details information,can download:\PRACTICAL CONSIDERATIONS IN CURRENT MODE POWER SUPPLIES