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參數(shù)資料
| 型號： | RP500N313A-TR-F |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.9 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | LEAD FREE, SOT-23, 6 PIN |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 664K |
| 代理商： | RP500N313A-TR-F |
RP500x
15
(3) Over Current Protection Circuit, Latch Type Protection Circuit
Over current protection circuit supervises the coil peak current (the current flowing Pch transistor) at each
switching cycle, and if the current beyond the Lx current limit (ILXlim), Pch transistor is turned off. the Lx
current limit of RP500x is Typ.900mA.
Further, if the over current status continues equal or longer than protection delay time, or, when the Lx limit
current is exceeded even once when the driver operates by duty 100%, a built-in driver is latched in the
OFF state and the operation of DC/DC converter stops.
Lx current limit and protection delay time is affected by self-heating and ambient environment. If the output
is short and the input voltage (VIN) is drastically dropped or becomes unstable, the protection operation
and delay time may vary.
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 detect voltage (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.
If too large current flows through the circuit because of short or other reasons, after the delay time of latch
type protection a built-in driver is latched in the OFF state and VLX signal will be "L", then output will turn off.
At the point (1), release the latch type protection is realized with CE reset as changed CE signal from "L" to
"H".
At the point (2), release the latch type protection is realized with UVLO reset as make the supply voltage
lower than UVLO detect voltage (VUVLO1) level.
Input Voltage
(VIN)
Set VOUT
UVLO Detect Voltage (VUVLO1)
CE Pin
Input Voltage
(VCE)
Set VOUT
Threshold Level
Lx Voltage
(VLX)
Set VOUT
Output Voltage
(VOUT)
UVLO Release Voltage (VUVLO2)
12
Soft-start Time
Set VOUT
Soft-start Time
Stable
operation
Protection Delay Time Protection Delay Time
UVLO Reset
CE Reset
Latch-type Protection
Stable
operation
Stable
operation
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