參數(shù)資料
型號(hào)： R1283Z1A-E2
廠商： RICOH COMPANY LTD
元件分類(lèi)： 電源模塊
英文描述： DC-DC REG PWR SUPPLY MODULE
封裝： 1.50 X 2.40 MM, WLCSP-11
文件頁(yè)數(shù)： 20/22頁(yè)
文件大?。?/td> 416K
代理商： R1283Z1A-E2
R1283x
7
Start up Sequence (R1283X001x)
When CE level turns from ‘L’ to ‘H’ level, the softstart of CH1 starts the operation. After detecting output
voltage of CH1（VOUT1） as the nominal level, the soft start of CH2 starts the operation.
Start up Sequence (R1283X002x)
When CE level turns from ‘L’ to ‘H’ level, the softstart of CH2 starts the operation. After detecting output
voltage of CH2（VOUT2） as the nominal level, the soft start of CH1 starts the operation.
Short protection circuit timer
In case that the voltage of VFB1 drops, the error amplifier of CH1 outputs "H". In case that the voltage of
VFB2 rises, the error amplifier of CH2 outputs "L". The built-in short protection circuit makes the ineternal
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 LX1 and LX2 will stop.
To release the latch operatoion, 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.
Phase Compensation of step-up DC/DC converter
DC/DC converter's phase may lose 180 degree by external components of L and C and load current.
Because of this, the phase margin of the system will be less and the stability will be worse. Therefore, the
phase must be gained.
A pole will be formed by external components, L and C.
Fpole ~ 1 / {2×π×√(L1×C2)}
（
CH1）
Fpole ~ 1 / {2×π×√(L2×C3)}
（
CH2）
Zero will be formed with R2, C5, R5, and C6.
Fzero ~ 1/(2×π×R2×C5)
（
CH1）
Fzero ~ 1/(2×π×R5×C6)
（
CH2）
Set the cut-off frequency of the Zero lower than the cut off frequency of the pole by L and C.
CE
CH1(VOUT1)
CH2(VOUT2)
0V
Soft Start CH2
Soft start CH1
CE
0V
CH1 (VOUT1)
CH2 (VOUT2)
Soft start CH1
Soft Start CH2
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