If the ramp driving your PWM-based controller isn't linear or monotonic, or just plain noisy, your DC/DC converter isn't going to work up to its capabilities. Here's what you need to know to get the ...

Op-amp integrators can ramp to saturation, and a capacitor-discharge switch can reset them. Alternatively, you can input-switch them to ramp up and down in triangle-waveform-generator applications.

Unijunction transistors (UJTs) were common circuit elements several decades ago. A simple ramp generator could be built from a single UJT and a few other components (Fig. 1). 1. In a simple UJT-based ...