參數(shù)資料
型號(hào)： R1225N122C-TR
英文描述： SMPS Controller
中文描述： 開(kāi)關(guān)電源控制器
文件頁(yè)數(shù)： 10/29頁(yè)
文件大?。?/td> 450K
代理商： R1225N122C-TR
12345
Rev. 1.11 - 10 -
Case 2. Set V
OUT
Voltage
≤
2.0V (Set V
OUT
Voltage < UVLO Voltage)
VIN
CE
EXT
VOUT
VOUT Set Output Voltage
UVLO Voltage
Soft Start
Reset with CE
Latch Protection
Stable Operation
UVLO Reset
Input Voltage
Rising Time
Protection Circuit Delay Time
UVLO Voltage
UVLO Voltage
VOUT Set Output Voltage
Stable Operation
Stable Operatio
Soft Start
Soft Start
The timing chart shown above describes the changing process of input voltage rising, stable operating,
operating with large current, reset with CE pin, stable operating, input voltage falling, input voltage recovering,
and stable operating.
First, until when the input voltage (V
IN
) reaches the UVLO voltage, the circuit inside keeps the condition of
pre-standby.
Second, after V
IN
becomes beyond the UVLO voltage, 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, the latch protection works, or EXT signal will be "H", then output will turn off. To
release the latch protection, input voltage should be equal or lower than UVLO level, or restart with CE (Once
turn off the circuit with CE and turn it on again). In the timing charge above, release the latch function is
realized with CE signal from "L" to "H". After removing the cause of large current and the reset with CE, soft-
start operation starts and after the soft-start time, the operation will be back to stable.
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 pre-
standby.
Then after V
IN
becomes beyond the UVLO voltage, soft-start operation starts, when the soft-start operation
finishes, the operation becomes stable.
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