R×5RL
• CURRENT BOOST CIRCUIT
Tr.1
VIN
+
C1
GND
VIN
R×5RL VOUT
SERIES
VOUT
GND
+
C2
GND
Output current of 60mA or more can be obtained by
the current boost circuit constructed as shown in this cir-
cuit diagram.
• CURRENT BOOST CIRCUIT WITH OVERCURRENT LIMIT CIRCUIT
R2 Tr.1
Vbe2
Tr.2
VIN
VIN
R1
+
C1
GND
A circuit for protecting Tr.1 from the destruction
caused by output short-circuit or overcurrent is shown in
R×5RL
SERIES
GND
VOUT
IOUT
+ VOUT
C2
this circuit diagram.
When the voltage reduction caused by the current ( aa
IOUT) which flows through R2 reaches Vbe2 of Tr.2 by
additionally providing the current boost circuit with Tr.2
and R2, Tr.2 is turned ON and the base current of Tr.1 is
GND increased, so that the output current is limited.
Current limit of Overcurrent Limit Circuit is obtained
as follows :
IOUT Vbe2/R2
• CURRENT SOURCE
VIN
VIN
+
C1
R×5RL VOUT
SERIES
R
GND
ISS
IOUT
A current source with the structure as shown in this
circuit diagram can be used. Output Current IOUT is
obtained as follows :
IOUT= Vreg*1/R + ISS
Take care that Output Current IOUT does not exceed
its allowable current.
*1) Vreg : Set Output Voltage of R×5RL Series.
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