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55DC-DC Converter Design and Magnetics

the MAX of the current limit specifi

cation. So, in this case, a “ loose ” current limit

specifi cation effectively amounts to requiring bigger components (transformer) for the

same maximum power-handling capability.

Note: Some makers of off-line integrated switcher ICs (e.g., the “ Topswitch ” from

Power Integrations) often tout their “ precise ” current limit, thus suggesting that

we get the best power-to-size ratio (i.e., converter power density) when using their

products. However, we should remember that in most cases, their product families

have a discrete set of fi xed current ...