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參數(shù)資料
| 型號(hào)： | R1282D002A-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2CH PWM DC/DC CONTROLLER |
| 中文描述： | DUAL SWITCHING CONTROLLER, 805 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 0.90 MM HEIGHT, TSON-10 |
| 文件頁數(shù)： | 17/18頁 |
| 文件大?。?/td> | 327K |
| 代理商： | R1282D002A-TR |
R1282D002A
EXTERNAL COMPONENTS
17
1. How to set the output voltages
As for step-up side, feedback (V
FB1
) pin voltage is controlled to maintain 1V, therefore,
V
OUT1
: R1
+
R2
=
V
FB1
: R2
Thus, V
OUT1
=
V
FB1
×
(R1
+
R2)/R2
Output Voltage is adjustable with R1 and R2.
As for Step-down side, Feedback (V
FB2
) pin voltage follows the next formula,
V
OUT2
: R3
+
R4
=
V
FB2
: R4
Thus, V
OUT2
=
V
FB2
×
(R3
+
R4)/R4
Output Voltage is adjustable with R3 and R4.
2. How to set Soft-Start Time and Maximum Duty Cycle
Soft-start time is adjustable with connecting resistors and a capacitor to DTC pin.
Soft starting time, T
SS1
and T
SS2
are adjustable. Soft-start time can be set with the time constant of RC.
Soft-start time can be described as in next formula.
T
SS1
RO1
×
C4
If R10
=
0
, then,
T
SS2
R9
×
C5
×
ln((Vrefout
V
DTC2
)/Vrefout)
Maximum Duty Cycle is set with the voltage to DTC1 and DTC2.
Maximum duty cycle is described as follows;
CH1 (Step-up side)
Maxduty1
(R8/(R7
+
R8)
×
Vrefout
0.2)/(1.2
0.2)
×
100 (%)
Step-up side maximum duty cycle should be set equal or less than 90%. If the maximum duty cycle is set at
high percentage, operation will be unstable.
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