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參數(shù)資料
| 型號： | R1215D002B |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | STEP-UP DC/DC CONTOLLER |
| 中文描述： | 升壓型DC /直流位指示 |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 448K |
| 代理商： | R1215D002B |
R1215D
13
<Latch Protection Operation>
The operation of Latch protection circuit is as follows: When AMPOUT becomes "H" and the IC detects
maximum duty cycle, charge to an external capacitor, C2 of DELAY pin starts. The maximum duty cycle
continues and the voltage of DELAY pin reaches delay voltage detector threshold, V
DLY
, outputs "L" to EXT pin
and turns off the external power MOSFET.
To release the latch protection operation, make the supply voltage down to UVLO detector threshold or lower,
and make it rise up to the normal input voltage.
Once after becoming the maximum duty cycle, if the duty cycle decreases before latch operation works, the
charging the capacitor stops immediately, and the DELAY pin voltage is fixed at GND level with I
DLY2
.
The delay time of latch protection can be calculated with C2, V
DLY
, and the delay pin charge current, I
DLY1
, as in
the next formula.
t
=
C2
×
V
DLY
/I
DLY1
Output Short
AMPOUT
Normal
Maxduty Operation
Latched
DTC
DELAY
EXT
C2
I
DLY1
DELAY
V
DLY
V
DLY
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R1215D002E | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTOLLER |
| R1215D002F | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTOLLER |
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