Epson SQ-B50/2550 Technical Manual page 88

REV.-A
EA 1 is used to detect excessive output current. Figure 2-18 illustrates the mechanism.
The output voltage is input to the negative terminal, and, in order for equal voltage to appear at the
positive terminal,
(OUTPUT VOLTAGE) X R34/(R39//R38)
=
1
R35
R35 becomes the load current flow (see Figure 2-18). 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.
Output
Voltage
R38
R34 R37
620 2K
R35
10K
Figure 2-18. Over-Current Protection (OCP)
2-20