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參數(shù)資料
| 型號(hào)： | R1224N182L |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | PWM/VFM step-down DC/DC Converter |
| 中文描述： | 脈寬調(diào)制/ VFM的降壓型DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/42頁 |
| 文件大?。?/td> | 876K |
| 代理商： | R1224N182L |
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R1224N
TIMING CHART
V
OUT
Set Output Voltage
UVLO Voltage
Input Voltage
Rising Time
UVLO Reset
V
OUT
Set Output Voltage
Protection Circuit Delay Time
V
OUT
Set Output
Voltage
V
IN
CE
EXT
V
OUT
V
OUT
Set Output
Voltage
Stable
Operation
Stable
Operation
Stable
Operation
Soft Start
Soft Start
Soft Start
Soft Start
Reset Protection
The timing chart shown above describes the changing process of input voltage rising, stable operating,
operating with large current, stable operating, input voltage falling, input voltage recovering, and stable
operating.
First, until when the input voltage (V
IN
) reaches UVLO voltage, the circuit inside keeps the condition of
pre-standby.
Second, after V
IN
becomes beyond the UVLO threshold, soft-start operation starts, when the soft-start
operation finishes, the operation becomes stable.
If too large current flows through the circuit because of short or other reasons, EXT signal ignores that during
the delay time of protection circuit. (The current value depends on the circuit.)
After the delay time passes, reset protection works, or EXT signal will be “H”, then output will turn off, then
soft-start operation starts. After the soft-start operation, EXT signal will be “L”, but if the large current is still
flowing, after the delay time of protection circuit passes, reset protection circuit will work again, the operation will
be continuously repeated unless the cause of large current flowing is not removed.
Once the cause of the large current flowing is removed, within the delay time, the operation will be back to the
stable one.
If the timing for release the large current is in the protection process, the operation will be back to the normal
one after the soft-start operation.
If the V
IN
becomes lower than the set V
OUT
, that situation is same as large current condition, so protection
circuit may be ready to work, therefore, after the delay time of protection circuit, EXT will be “H”.
Further, if the V
IN
is lower than UVLO voltage, the circuit inside will be stopped by UVLO function.
After that, if V
IN
rises, until when the V
IN
reaches UVLO voltage, the circuit inside keeps the condition of
spre-standby.
Then after V
IN
becomes beyond the UVLO threshold, soft-start operation starts, when the soft-start operation
finishes, the operation becomes stable.
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