RN5RL55AC-T2 RICOH electronics devices division, RN5RL55AC-T2 Datasheet - Page 18

• Manufacturer Part Number: RN5RL55AC-T2
• Description: VOLTAGE REGULATOR
• Manufacturer: RICOH electronics devices division

• CURRENT BOOST CIRCUIT
• CURRENT BOOST CIRCUIT WITH OVERCURRENT LIMIT CIRCUIT
• CURRENT SOURCE
GND
V
IN
GND
V
C1
V
IN
IN
C1
+
C1
R1
+
Tr.2
V
+
IN
Tr.1
R2
Vbe2
SERIES
R 5RL
V
IN
GND
Tr.1
SERIES
R 5RL
V
V
OUT
IN
GND
I
SS
SERIES
R 5RL
V
R
OUT
GND
+
C2
I
OUT
V
OUT
GND
V
+
OUT
C2
V
I
GND
OUT
OUT
the current boost circuit constructed as shown in this cir-
cuit 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 :
circuit diagram can be used. Output Current I
obtained as follows :
its allowable current.
OUT
*
A circuit for protecting Tr.1 from the destruction
When the voltage reduction caused by the current ( aa
Current limit of Overcurrent Limit Circuit is obtained
A current source with the structure as shown in this
Take care that Output Current I
Output current of 60mA or more can be obtained by
1) Vreg : Set Output Voltage of R 5RL Series.
) which flows through R2 reaches Vbe2 of Tr.2 by
I
I
OUT
OUT
= Vreg /R + I
Vbe2/R2
*
1
SS
OUT
does not exceed
R 5RL
OUT
is
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