rn5rl33a RICOH Co.,Ltd., rn5rl33a Datasheet - Page 17

• Manufacturer Part Number: rn5rl33a
• Description: Voltage Regulator
• Manufacturer: RICOH Co.,Ltd.

• CURRENT BOOST CIRCUIT
• CURRENT BOOST CIRCUIT WITH OVERCURRENT LIMIT CIRCUIT
• CURRENT SOURCE
GND
V
IN
GND
V
C1
IN
V
C1
IN
+
C1
R1
+
Tr.2
V
+
IN
Tr.1
R2
Vbe2
SERIES
V
Rx5RL
IN
GND
Tr.1
SERIES
Rx5RL
V
V
IN
OUT
GND
I
SS
SERIES
V
Rx5RL
OUT
R
GND
+
C2
V
I
OUT
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 :
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
Output current, I
Output current of 60mA or more can be obtained by
1) Vreg : Set output voltage of Rx5RL Series.
) which flows through R2 reaches Vbe2 of Tr.2 by
I
I
OUT
OUT
= Vreg /R + I
Vbe2/R2
*
1
OUT
SS
should not exceed its allowable
Rx5RL
OUT
is
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