Description

As motion control and power interface systems become more complex, the need for more sophisticated control circuitry arises. One common application involves the need for synchronizing multiple pulse width modulators (PWMs). This requirement may result from the need to eliminate beat frequencies when multiple PWMs reside on the same printed circuit board, or from timing considerations in redundant systems where voting between drivers is required.

The UC3637 is an extremely versatile PWM used in many motor control and power driver applications, and the need for synchronization often arises. In order to properly accomplish this, a few simple design rules must be followed. These rules apply primarily to resetting the part’s current limit latches.