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The multiplier output current IM flows out of the MOUT pin through the 4k resistor RMOUT and develops the reference signal to the current loop that is controlled by the current amplifier. Current gain is the ratio of RMOUT to line current sense resistor. The currentamplifierisatransconductance amplifier. Typical 9m is 320am ho and gain is 60dB with no load. The inverting input is internally tied to GND. The noninverting input is tied to the multiplier output. The output is internally clamped at 8V. Output resistance is about 4M; DC loading should be avoided because it will lower the gain and introduce offset voltage at the inputs which becomes a false reference signalto the currentloop and can distort line current. Note that in the current averaging operation, high gain at twice the line frequency is necessary to minimize line current distortion. Because CAOUT may needto swing 5V overone line cycle at high line condition,llmV will be present at theinputs ofthe current amplifier if gain is rolled off t0 450 at 120Hz (lnF in series with 10k at CAOUT). At lightload,when (IM)(RMOUT) can be less than lOOmV, lower gain will distort the current loop reference signal and line current. If signal gain at the lOOkHz switching frequency is too high, the system behaves more like a current mode system and can cause subharmonic oscillation. Therefore, the current amplifier should be compensated to have a gain of less than 15 at lOOkHz and more than 300 at 120Hz.