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| 型号： | RS5VE002S-E2 |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 0.80 MM PITCH, SSOP-16 |
| 文件页数： | 14/55页 |
| 文件大小： | 386K |
| 代理商： | RS5VE002S-E2 |
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17
Regulators 1,2
EXPLANATION OF OPERATION
ROUT4
IBC1,2
VDD
R2
R1
GND
CSW1,2
Level
Shift
ROUT1,2
Current
Limit
Circuit
V
re
f
+
–
C1,2
Each of Regulators 1 and 2 is constructed in combination with an external PNP transistor as shown in the
above Figure. Regulators 1 and 2 divide Output Voltage VOUT by Feed-back Registers R1 and R2, and the divid-
ed voltage at the node between Registers R1 and R2 is compared with the reference voltage by Error Amplifier, so
that the base current of the PNP transistor is adjusted, and a constant voltage is output. The output current from
each of Regulators 1 and 2 is monitored by Current Limiter, and when the output current exceeds a limit current,
Current Limiter limits the base current of the PNP transistor to the limit current.
The level of input signals to CSW 1, 2 is set at the same level as the output voltage level of ROUT4 by built-in
level shift circuit.
Phase compensation is made by C1,2.
Regulators 3,4
V
re
f
CSW3
ROUT4
VDD
R2
R1
GND
A
ROUT3,4
Current
Limit
Circuit
Level
Shift
+
–
Regulators 3 and 4 divide Output Voltage VOUT by feed-back Registers R1 and R2, and the divided voltage at
the node between Registers R1 and R2 is compared with the reference voltage by Error Amplifier, so that a con-
stant voltage is output. The output current from each of Regulators 3 and 4 is monitored by Current Limiter, and
when the output current exceeds a limit current, Current Limiter limits the output current to the limit current.
Regulator 4 is short-circuited at Point A in the above Figure, so that Regulator 4 is always in operation.
The level of input signals to CSW1, 2 is set at the same level as the output voltage level of ROUT4 by built-in lev-
el shift circuits.
R
×5VE0×××
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