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参数资料
| 型号： | RP502L081B-TR |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 3960 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 1.60 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6 |
| 文件页数： | 8/30页 |
| 文件大小： | 1222K |
| 代理商： | RP502L081B-TR |
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RP502x
16
(2) Under Voltage Lockout (UVLO) Circuit
The step-down DC/DC converter stops the switching operation if the input voltage (VIN) becomes lower
than the setting voltage (Set VOUT). As a result, the output voltage (VOUT) gradually drops according to the
input voltage (VIN). If the input voltage drops furthermore and becomes lower than UVLO detector threshold
(VUVL01), the under voltage lockout circuit (UVLO) starts to operate. The internal reference voltage of the ICs
(VREF) stops and the output voltage drops according to the load.
To restart the operation, the input voltage (VIN) needs to be raised higher than the UVLO released voltage
(VUVL02). The timing chart below shows that the operation with varied input voltages (VIN).
VUVLO2
VUVLO1
Set VOUT
Output Voltage
Input Voltage
IC Internal Voltage
Reference
LX Voltage
Soft-start Time
Influences by Power supply,
Load Current, External Components
(VOUT)
(VIN)
(VREF)
(VLX)
* The start-up speeds of VOUT at operation and recovery or the default voltage and the output current of COUT.
Could affect on the waveform in the above chart. Therefore, the actual waveform could be slightly different
from the waveform in the above chart.
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