Selecting the Optimum Control Method

The seleetion of the eontrol IC is very important. If the wrong ehoiee is made, it eould result in supply instability and waste valuable time. The designer should understand the subtle differenee between the various forms of eontrol. In general, forward-mode topologies usually have voltage-mode eontrollers, and boost-mode topologies usually have eurrent-mode eontrol. This is not a roek-solid rule sinee every method of eontrol ean be used for every topology, with mixed results. [Pg.72]

There are two versions of overeurrent proteetion on voltage-mode eontrol ICs. The older version is average current foldback. Here, the output eurrent is [Pg.72]

Voltage-mode with average OC foldbaek Forward-mode OC foldbaek slow, eould eause power switeh failures [Pg.72]

Voltage-mode with pulse-to-pulse OC limiting Forward-mode Very good OC proteetion usually hi-side eurrent sensing [Pg.72]

Current-mode, turn-on with eloek Boost Very good OC proteetion many ICs typieally GND-driven SW [Pg.72]

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