![]() ![]() The output stage is clamped to a maximum V OUT of 18V in the on state. Trims have been added to the oscillator circuit for both frequency and sink current, and both of these parameters are tightly specified. Eliminating this filter allows the current sense loop to operate with minimum delays. This minimizes or eliminates the filter that is normally required. Leading edge blanking has been added to the current sense comparator. Several new features have been incorporated. Cross-conduction current spikes in the totem pole output stage have been eliminated, making 1MHz operation practical. Start-up current has been reduced to less than 250♚. They contain a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output stage ideally suited to driving power MOSFETs. The LT1246/LT1247 are optimized for off-line and DC/DC converter applications. These devices are designed to be improved plug compatible versions of the industry standard UC1842 PWM circuit. The LT1246/LT1247 are 8-pin, fixed frequency, current mode, pulse width modulators. ![]()
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