Epson LQ-510 Technical Manual page 65

REV.-A
EA1 is used to detect excessive output current. Figure 2-29 illustrates the mechanism. The output voltage
is input to the negative terminal, and in order for equal voltage to appear at the positive terminal:
R35 becomes the load current flow (see Figure 2-29). In other words, higher current than this will trigger
over-current protection, the output voltage will be reduced, and the current will, thereby, be restricted.
LQ-510
(OUTPUT VOLTAGE)
R35
Figure 2-29. Over-Current Protection (OCP)
R34/(R39 // R34) = I
X
R35
10K
PRINCIPLES OF OPERATION
2-23