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KA3842 Meter Board OH2 Meter Board Panel wired and populated for installation in all modular cabinets. 2 meter board, 0 TSG, 0 Reserve. Long Description:. Jul 1, 2000 The control circuit is implemented by the use of the current-mode controller IC, KA3842 which is very popular in controlling power supplies. DESCRIPTION. The UC384xB family of control ICs provides the nec- essary features to implement off-line or DC to DC fixed frequency current mode control Dual Slope A/D Conversion. Multiplexed BCD Display. Ultra Stable Internal Band Gap Voltage Reference. Capable of Reading 99mV Below Ground with for noise concerns. output ripple: if ripple pollutes feedback, tail chasing can occur. crossover frequency rolloff is mandatory, e.g. in PFC circuits.