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參數(shù)資料
| 型號(hào)： | R3118K111A-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | 1.20 X 1.20 MM, HALOGEN AND LEAD FREE, DFN-6 |
| 文件頁數(shù)： | 22/23頁 |
| 文件大小： | 481K |
| 代理商： | R3118K111A-TR |
R3118x
8
OPERATION
Operation of R3118xxxxA
Vref
Ra
Rb
Rc
VDD
DOUT
GND
Tr.1
Nch
Comparator
)DOUT pin should be pulled-up to
VDD or an external voltage level.
Delay
Circuit
CD
SENSE
Block diagram with an external capacitor (R3118xxxxA)
+VDET
VDET
12
3
VDDL
GND
A
B
tdelay
treset
Supply Voltage (VDD)
Output Voltage
(VOUT)
SENSE Pin Voltage
(VSENSE)
Detector Threshold
Hysteresis
Detector Threshold
Released Voltage
Pull-up Voltage
Detect Output Delay Time
Release Output Delay Time
Minimum Operating
Voltage
Step
1
2
3
Comparator (
)
Pin Input Voltage
I
II
I
Comparator Output
L
H
L
Tr.1
OFF ON OFF
Output Tr.
Nch
OFF ON OFF
I
×VSENSE
Rb
+Rc
Ra
+Rb+Rc
II
×VSENSE
Rb
Ra
+Rb
Operation Diagram
Explanation of operation
Step 1. The output voltage is equal to the pull-up voltage.
Step 2. At Point "A", Vref ≤ VSENSE
×(Rb+Rc)/(Ra+Rb+Rc) is true, as a result, the output of comparator is reversed
from "L" to "H", therefore the output voltage becomes the GND level. The voltage level of Point A means
a detector threshold voltage (-VDET). (When the supply voltage is lower than the minimum operating
voltage, the operation of the output transistor becomes indefinite. The output voltage is equal to the GND
level.)
Step 3. At Point "B", Vref ≤ VSENSE
×Rb/(Ra+Rb) is true, as a result, the output of comparator is reversed from "H"
to "L", then the output voltage is equal to the pull-up voltage. The voltage level of Point B means a
released voltage (+VDET).
) The difference between a released voltage and a detector threshold voltage is a detector threshold hysteresis.
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