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参数资料
| 型号： | RP505K091A-TR |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 2 X 2 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-8 |
| 文件页数： | 7/32页 |
| 文件大小： | 938K |
| 代理商： | RP505K091A-TR |
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RP505K
15
(2) Under Voltage Lockout (UVLO) Circuit
The step-down DC/DC converter stops and ON duty becomes 100%, if input voltage (VIN) becomes less
than the set output voltage (Set VOUT), the output voltage (VOUT) gradually drops according to the input
voltage (VIN). If the input voltage drops more and becomes less than UVLO detector threshold (VUVLO1), the
under voltage lockout circuit (UVLO) operates, the IC internal reference voltage (VREF) stops, switching
transistors turn off and the output voltage drops according to the load and output capacitor COUT value.
To restart the normal operation, the input voltage (VIN) must be more than the UVLO released voltage
(VUVLO2).
The timing chart below describes the operation with varying the input voltage (VIN).
VUVLO2
VUVLO1
Set VOUT
Output Voltage
Input Voltage
IC Internal Voltage
Reference
Lx Voltage
Soft-start Time
Depending on Power supply,
Load Current, External Components
(VOUT)
(VIN)
(VREF)
(VLX)
Actually, the waveform of VOUT at UVLO working and releasing varies depending on the initial voltage of
COUT and load current situation.
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相关代理商/技术参数 |
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