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HEV.A
Characteristics of Photo Coupler PC2
PRINCIPLES OF OPERATION
In the photo coupler, the output current (IC)
increases in
proportion to the
current flowing in the LED (IF).
If
FIGURE 2-2-17.
OUTPUT CURRENT OF PHOTOCOUPLER
Characteristics of HA16654
The
8th-pin
error
input
terminal
and
the
5th-pin output terminal of the
HA16654 have the following relation.
*
If the voltage of
ERROR
INPUT terminal rise, the pulse width of the
output
terminal is reduced.
ERROR INPUT
DEAD BAN 0
--+-+-~~--t-~-""'~""'--
I
eT11
1
1
1 1
11
OUTPUT _ .......
"-'---~
FIGURE
2-2-18.
OUTPUT SIGNAL WAVEFORM
Characteristics of 24
When the reference vo1tage of the IC24 reaches a fixed voltage, current flows
from cathode to anode shown in Figure 2-2-17.
2-11
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