Gnd Pin 1 ground : All voltages are measured with re- spect to Gnd. The tim- ing capacitor discharge current also returns to this pin, so the lead from the oscillator timing capacitor to Gnd should also be as short and as direct as possible. Connect this input to the negative voltage on the current sense resistor as shown in Figure 1. Use a resis- tor to REF to offset the negative current sense signal up to Gnd.
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UC3854N PDF Datasheet浏览和下载