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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： | 9/30页 |
| 文件大小： | 1222K |
| 代理商： | RP502L081B-TR |
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RP502x
17
(3) Overcurrent Protection Circuit, Latch Type Protection Circuit
Overcurrent protection circuit supervises the peak current of the inductor (The current passing through
Pch Tr.) at each switching cycle. If the peak current exceeds the LX current limit (ILXLIM), the overcurrent
protection circuit turns off the Pch transistor. The LX current limit of the RP502x Series is set at Typ. 900mA
(VOUT≥1.2V), and Typ. 800mA (VOUT<1.2V).
Latch type protection circuit latches the built-in driver in OFF state to stop the operation of the ICs if the
overcurrent status continues more than the protection delay time (tprot).
LX limit current (ILXLIM) and the protection delay time (tprot) could be easily affected by self-heating and
ambient environment. The drastic drop of input voltage (VIN) or the unstable input voltage caused by the
short-circuiting in the output (VOUT) may affect on the protection operation and the delay time.
Protection Delay Time (tprot)
LX Current Limit (ILXLIM)
LX Current
Pch Tr. Current
LX Voltage
(VLX)
To release the latch type protection circuit, reset the ICs by inputting “L” into CE pin or make the input
voltage lower than the UVLO detector threshold (VUVL01).
As the following timing chart shows, the changing process of input voltage flows as follows: start-up,
stable operation, high load condition, CE reset, stable operation, input voltage drop, input voltage recovery,
and stable operation.
If the ICs enters the high load condition due to short-circuit or such, after the protection delay time (tprot),
the built-in driver is latched in OFF state. VLX becomes “L” and then the output voltage turns off. There are
two ways of releasing the latch type protection: CE reset and UVLO reset.
(1) CE reset makes the CE signal to “L” once and then turns the CE signal back to “H” again.
(2) UVLO rest makes the input voltage lower than the UVLO voltage (VUVL01).
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)
(1)
(2)
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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