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RV5VE001B-E2 Datasheet

  • RV5VE001B-E2

  • MULTI-POWER SUPPLY

  • 49頁

  • RICOH

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RV5VE0
脳脳脳
鈥?/div>
Detector 2
V
SEN2
V
DD
Current Source
Ra
+
鈥?/div>
Vref
Rb
Tr.1
Rc
GND
C
D
Output Capacitor
Tr.2
Rb
RESET
Operation Diagram
Step
1
2
3
4
B
A
5
Step
Step 1
Step 2
Step 3
Step 4
Step 5
Detector Threshold Hysteresis
Released Voltage +V
DET
Detected Voltage 鈥揤
DET
Minimum Operating Voltage
GND
Comparato (+) Pin
Input Voltage
Comparator Output
Tr. 1
Output Tr.
Nch
I
.
I
H
OFF
OFF
II
L
ON
ON
II
L
ON
Indefinite
II
L
ON
ON
I
H
OFF
OFF
Output Voltage
Delay Time
Rb + Rc
Ra + Rb + Rc
路 V
DD
GND
II.
Rb
Ra + Rb
路 V
DD
Step of Operation
The following descriptions deal with V
DD
pin and V
SEN
2
pin as connected each other, but Detector 2 can be detect-
ed the different voltage from V
DD
through V
SEN
2
pin.
Step 1. Output Voltage is equal to Pull-up Voltage.
Step 2. When Input Voltage (V
SEN
2
) reaches the state of Vref
鈮?/div>
V
SEN
2
路 (Rb+Rc)/(Ra+Rb+Rc)at Point A (Detected Voltage 鈥?V
DET
), the output of Compara-
tor is reversed, so that Output Voltage becomes GND. Discharging is performed from C
D
pin connected to External Capacitor. No delay time is
generated.
Step 3. Output Voltage becomes indefinite when Power Source Voltage (V
DD
) is smaller than Minimum Operating Voltage. When the output is pulled-
up,V
DD
is output.
Step 4. Output Voltage becomes equal to GND.
Step 5. When Input Voltage (V
SEN
2
) reaches the state of Vref鈮
SEN
2
路 Rb/(Ra + Rb) at Point B (Released Voltage +V
DET
), the output of Comparator is reversed, and
the External Capacitor is charged through C
D
pin,so that Output Voltage becomes equal to Pulled-up Voltage after a delay timeT
D
(= 0.69
脳
10
6
脳
C
D
).
19

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