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參數(shù)資料
| 型號： | R1285L462A |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, DSO12 |
| 封裝： | 2.70 X 3 MM, DFN-12 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 241K |
| 代理商： | R1285L462A |
R1285L
9
●Auto Discharge Function
When CE level turns from ‘H’ to ‘L’ level, the R1285 goes into standby mode and switching of the outputs of
LXP2 and LXN will stop. Then dischage switsh between VOUTN and PVCC and switch between VOUTP and GND
turn on and discharge the negative output voltage and positive output voltage. When the negative output
voltage is discharged to 0V, the switsh between VOUTN and PVCC turns off and the negative output will be Hi-Z.
Positive output voltage is discharged to 0V In standby mode.
If Vcc voltage became lower than UVLO detect voltage , discharge switches also turn on and discharge
output voltage(VOUTN and VOUTP) .
In case of timer latch protection,discharge switches will keep off .
●Short protection circuit timer
In case that the voltage of VOUTP drops, the error amplifier of CH1 outputs "H". In case that the voltage of
VOUTN rises, the error amplifier of CH2 outputs "L". The built-in short protection circuit makes the internal
timer operate with detecting the output of the error amplifier of CH1 as "H", or the output of the error
amplifier of CH2 as "L". After the setting time will pass, the switching of LXP2 and LXN will stop and shutdown
switch will turn off and both of discharge switches will keep off .
To release the latch operation, make the Vcc set equal or less than UVLO level and restart or set the CE pin
as "L" and make it "H" again.
During the softstart operation of CH1and CH2, the timer operates independently from the outputs of the
error amplifiers. Therefore, even if the softstart cannot finish correctly because of the short circuit, the
protection timer function will be able to work correctly.
During a timer function, current is
restricted by current limit protection
or maxduty function until shutdown .
Normal state
Short state
Latch state
Timer function (Typ. 50ms)
Shutdown
Amp output for Boost
Amp output for Inverting
After shutdown
drivers and shutdown
switch turn off
CE
VOUTN
0V
Discharge
Hi-Z (VOUTN)
0V (VOUTP)
VOUTP
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