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參數(shù)資料
| 型號： | R3119N029A-TR-FE |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | HALOGEN FREE AND ROHS COMPLIANT, SOT-23, 5 PIN |
| 文件頁數(shù)： | 24/24頁 |
| 文件大?。?/td> | 347K |
| 代理商： | R3119N029A-TR-FE |
R3119N
9
Operation of R3119NxxxE (SENSE pin type)
Vref
Ra
Rb
Rc
VDD
DOUT
GND
Tr.1
Nch
Comparator
SENSE
DOUT pin should be pulled-up to
an external voltage level.
Block Diagram
+VDET
-VDET
1
2
3
VDDL
GND
A
B
tPLH
tPHL
Supply Voltage (VDD)
Output Voltage
(VOUT)
SENSE Pin Voltage
(VSENSE)
Detector Threshold
Hysteresis
Detector Threshold
Released Voltage
Pull-up Voltage
Detect Delay Time
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. SENSE pin voltage is larger than detector threshold; 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 higher than the minimum operating
voltage, 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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