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参数资料
| 型号： | RE5RE21AC-RF |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | VOLTAGE REGULATOR FOR MIDDLE OUTPUT CURRENT |
| 中文描述： | 2.1 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PBCY3 |
| 封装： | TO-92, 3 PIN |
| 文件页数： | 20/20页 |
| 文件大小： | 137K |
| 代理商： | RE5RE21AC-RF |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| RE5RE21AC-RR | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:VOLTAGE REGULATOR FOR MIDDLE OUTPUT CURRENT |
| RE5RE21AC-T1 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:VOLTAGE REGULATOR FOR MIDDLE OUTPUT CURRENT |
| RE5RE21AC-T2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:VOLTAGE REGULATOR FOR MIDDLE OUTPUT CURRENT |
| RE5RE21AC-TZ | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:VOLTAGE REGULATOR FOR MIDDLE OUTPUT CURRENT |
| RE5RE22A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Fixed Voltage Regulator |
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