參數(shù)資料
型號： RX5RE40A
廠商： Ricoh Co., Ltd.
英文描述： VOLTAGE REGULATOR FOR MIDDLE OUTPUT CURRENT
中文描述： 電壓調節(jié)中等輸出電流
文件頁數(shù)： 20/20頁
文件大?。?/td> 137K
代理商： RX5RE40A
19
CURRENT BOOST CIRCUIT
Output current of 120mA or more can be obtained
by the current boost circuit constructed as shown in
this circuit diagram.
CURRENT BOOST CIRCUIT WITH OVERCURRENT LIMIT CIRCUIT
CURRENT SOURCE
A current source with the structure as shown in
this circuit diagram can be used. Output Current
I
OUT
is obtained as follows :
I
OUT
=Vre*
SS
Take care that Output Current I
OUT
does not exceed
its allowable current.
*
1) Vreg : Set Output Voltage of R
×
5RE Series.
R
×
5RE
C2
GND
GND
GND
R
×
5RE
SERIES
V
OUT
V
OUT
C1
V
IN
V
IN
Tr.1
+
+
C2
GND
GND
GND
R
×
5RE
SERIES
V
OUT
V
OUT
V
IN
V
IN
Tr.1
Tr.2
R1
R2
I
OUT
Vbe2
+
+
GND
R
×
5RE
SERIES
C1
V
IN
V
IN
R
I
OUT
I
SS
V
OUT
+
A circuit for protecting Tr.1 from the destruction
caused by output short-circuit or overcurrent is shown in
this circuit diagram.
When the voltage reduction caused by the current (
aa
I
OUT
) 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
increased, so that the output current is limited.
Current limit of Overcurrent Limit Circuit is obtained
as follows :
I
OUT
Vbe2/R2
1
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