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参数资料
| 型号： | RP504K291D-E2 |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 0.9 A SWITCHING CONTROLLER, 2550 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 1.20 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6 |
| 文件页数： | 8/29页 |
| 文件大小： | 996K |
| 代理商： | RP504K291D-E2 |
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RP504x
16
(3) Over Current Protection Circuit, Latch Type Protection Circuit
Over current protection circuit supervises the inductor peak current (the current flowing through Pch
transistor) in each switching cycle, and if the current exceeds the LX current limit (ILXlim), turns off Pch
transistor. The LX current limit of RP504x is Typ.900mA.
Latch type protection circuit latches the built-in driver to the OFF state and stops the operation of DC/DC
converter if the over current status continues or the output voltage continues being the half of the setting
voltage for equal or longer than protection delay time (tprot).
LX current limit (ILXlim) and protection delay time (tprot) could be easily affected by self-heating or ambient
environment. If the input voltage (VIN) drops drastically or becomes unstable due to short-circuit, the
protection operation and protection delay time may be affected.
Protection Delay Time (tprot)
Lx Current Limit (ILXlim)
Lx Current
Pch Tr. Current
Lx Voltage
(VLX)
To release the condition of latch type protection, restart this IC by inputting "L" signal to CE pin, or restart
this IC with power-on or make the supply voltage lower than UVLO detector threshold (VUVLO1) level.
The timing chart shown below 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.
Point(1) : If the large current flows through the circuit or the IC goes into low output voltage condition due to
short-circuit or other reasons, the latch type protection circuit latches the built-in driver to OFF state after the
protection delay time (tprot). Then, VLX becomes "L" and the output voltage turns OFF. In this timing chart
below, the latch protective circuit can be released by once putting the IC into "L" with the CE pin and then
into "H" again.
Point(2) : The latch type protection can be released by UVLO reset by making the input voltage lower than
the UVLO detector threshold(VUVLO1).
Input Voltage
(VIN)
Set VOUT
UVLODetect Voltage (VUVLO1)
CE Pin
Input Voltage
(VCE)
Set VOUT
Threshold Level
Lx Voltage
(VLX)
Set VOUT
Output Voltage
(VOUT)
UVLORelease Voltage (VUVLO2)
(1)
(2)
Soft-start Time
Set VOUT
Soft-start Time
Stable
operation
Protection Delay Time Protection Delay Time
UV LO Reset
CE Reset
Latch-type Protection
Stable
operation
Stable
operation
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