RE5RE Ricoh Corporation, RE5RE Datasheet - Page 19

• Manufacturer Part Number: RE5RE
• Manufacturer: Ricoh Corporation

• CURRENT BOOST CIRCUIT
• CURRENT BOOST CIRCUIT WITH OVERCURRENT LIMIT CIRCUIT
• CURRENT SOURCE
GND
V
IN
V
GND
IN
V
IN
C1
C1
+
+
V
R1
IN
+
Tr.2
Tr.1
SERIES
Rx5RE
R2
Vbe2
GND
V
IN
Tr.1
V
SERIES
OUT
Rx5RE
V
IN
I
GND
SS
R
SERIES
Rx5RE
V
OUT
GND
+
I
OUT
C2
V
OUT
GND
V
+
OUT
C2
V
I
GND
OUT
OUT
by the current boost circuit constructed as shown in
this circuit diagram.
caused by output short-circuit or overcurrent is shown in
this circuit diagram.
I
additionally providing the current boost circuit with Tr.2
and R2, Tr.2 is turned ON and the base current of Tr.1 is
increased, so that the output current is limited.
as follows :
this circuit diagram can be used. Output Current
I
Take care that Output Current I
its allowable current.
OUT
OUT
*
A circuit for protecting Tr.1 from the destruction
When the voltage reduction caused by the current (
Current limit of Overcurrent Limit Circuit is obtained
Output current of 120mA or more can be obtained
A current source with the structure as shown in
1) Vreg : Set Output Voltage of Rx5RE Series.
) which flows through R2 reaches Vbe2 of Tr.2 by
I
is obtained as follows :
OUT
I
OUT
=Vreg /R + I
Vbe2/R2
*
1
SS
OUT
does not exceed
Rx5RE
aa
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