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參數(shù)資料
| 型號： | R1211X |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | Step-up DC/DC Controller |
| 中文描述： | 升壓DC / DC控制器 |
| 文件頁數(shù)： | 13/33頁 |
| 文件大小： | 375K |
| 代理商： | R1211X |
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Rev. 1.10 - 13 -
When the voltage level of SS becomes the setting voltage with the ration of R1 and R2 or more, switching operation
starts. V
REF
level gradually increases together with SS level. V
OUT
is also rising with balancing V
REF
and V
FB
. Duty
cycle depends on the lowest level among AMPOUT, SS, and DTC of the 4 input terminals in the PWM comparator.
(Step3)
When SS reaches 1V, soft-start operation finishes. V
REF
becomes constant voltage (=1V). Then the switching
operation becomes normal mode.
V
IN
V
OUT
SS,VREF
V
FB
SS
V
FB
,VREF
DTC
AMPOUT
Step1 Step2
AMPOUT
<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 DELAY pin starts. And 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 IC be standby mode with CE pin and make it active in terms of
R1211X002B/D version. Otherwise, make supply voltage down to UVLO detector threshold or lower, and make it rise
up to the normal input voltage.
During the soft-start time, if the duty cycle may be the maximum, protection circuit does not work and DELAY pin is
fixed at GND level.
The delay time of latch protection can be calculated with C2, V
DLY
, and Delay Pin Charge Current, I
DLY1
, as in the
next formula.
t=C2
×
V
DLY
/I
DLY1
Once after the maximum duty is detected and released before delay time, charge to the capacitor is halt and delay
pin outputs “L”.
V
DLY
AMPOUT
Normal
maxduty
Operation
Latched
DTC
AMPOUT
DELAY
Output Short
EXT
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