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参数资料
| 型号： | R1224N222F-TR |
| 英文描述： | SMPS Controller |
| 中文描述： | 开关电源控制器 |
| 文件页数： | 10/36页 |
| 文件大小： | 503K |
| 代理商： | R1224N222F-TR |
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Rev. 1.12 - 10 -
I
TIMING CHART
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.
VIN
CE
EXT
VOUT
UVLO Voltage
VOUT Set Output Voltage
VOUT Set Output Voltage
VOUT Set Output
Voltage
VOUT Set Output
Voltage
Stable
Operation
UVLO Reset
Input Voltage
Rising Time
Protection circuit delay time
Reset Protection
Soft-start
Stable
Operation
Stable
Operation
Soft-start
Soft-start
Soft-start
相关PDF资料 |
PDF描述 |
|---|---|
| R1224N222G-TR | Analog IC |
| R1224N222H-TR | SMPS Controller |
| R1224N222L-TR | Analog IC |
| R1224N222M-TR | SMPS Controller |
| R1224N232E-TR | SMPS Controller |
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