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Fig. 11-1
By switching VIN (+28.8V) by the transistor TR1 within the STR2024,
DC+24V supply is obtained through the LC network. Stable +24V is
obtained by controlling on/off duty of TR1.
DC+24V supply is obtained through the LC network. Stable +24V is
obtained by controlling on/off duty of TR1.
ION:
Current when TR1 is on.
IOFF: Current when TR1 is off.
12. I/R communication circuit
•
In the ER-A490, infra-red data transmission of the optical commu-
nication system is performed.
nication system is performed.
VIN
+28.8V
+
4700µ
63V
5
VIN
TR1
Refer-
ence
voltage
circuit
3
2
4
1
L1 220µ H
IOFF
ION
+24V
+24V
Load
C2
2200µ F
35V
2200µ F
35V
R2
STR2024
32
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