參數(shù)資料
型號(hào)： R1212D100B
廠商： Ricoh Co., Ltd.
英文描述： STEP-UP DC/DC CONTOLLER
中文描述： 升壓型DC /直流位指示
文件頁(yè)數(shù)： 15/41頁(yè)
文件大小： 690K
代理商： R1212D100B
R1212D
15
<Latch Protection Operation>
The operation of Latch protection circuit is as follows: When AMPOUT becomes "H" and the IC detects
maximum duty cycle, charge to an external capacitor, C2 of D
ELAY
pin starts. The maximum duty cycle continues
and the voltage of DELAY pin reaches delay voltage detector threshold, V
DLY
, outputs "L" to EXT pin and turns off
the external power MOSFET.
To release the latch protection operation, make the supply voltage down to UVLO detector threshold or lower,
and make it rise up to the normal input voltage.
Once after becoming the maximum duty cycle, if the duty cycle decreases before latch operation works, the
charging the capacitor stops immediately, and the DELAY pin voltage is fixed at GND level with I
DLY2
.
The delay time of latch protection can be calculated with C2, V
DLY
, and the delay pin charge current, I
DLY1
, as in
the next formula.
t
=
C2
×
V
DLY
/I
DLY1
Output Short
A
MPOUT
Normal
Maxduty Operation
Latched
DTC
D
ELAY
EXT
C
2
I
DLY1
DELAY
V
DLY
V
DLY
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