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參數(shù)資料
| 型號： | R1280D002X |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | Linear Sensor Photodiode Array; 896x1 Sensor-Elements Organization; 200 Dots-Per-Inch (DPI) Sensor Pitch; High Linearity and Uniformity; Wide Dynamic Range 2000:1 (66 dB); Low Image Lag 0.5% Typ; Operation to 5MHz |
| 中文描述： | 2聲道的PWM DC / DC控制器 |
| 文件頁數(shù)： | 25/26頁 |
| 文件大小： | 344K |
| 代理商： | R1280D002X |
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Rev. 1.10 - 25 -
G
R1280D002B
C7
R6
L1
NMOS
EXT1
EXT2
GND
V
IN
CE
Vrefout
DTC1DTC2
V
FB1
V
FB2
R1
R2
C1
PMOS
C8
R3
R4
C3
L2
C4
C6
VOUT1
VOUT2
C5
Diode
R5
VOUT3
C10
C11
External Components
Inductor L1,2: 6.8
μ
H, LDR655312T(TDK)
Diode: FS1J3 (Origin Electronics)
NMOS: IR7601 (International Rectifier)
PMOS: Si3443 (Siliconix)
Resistors: R1, R2, R3, R4 for Setting Output Voltage. Recommendation values are R1+R2
≤
100k
or R3+R4
≤
100k
R5=43k
, R6=10k
Capacitors: Ceramic Capacitor
(Example)
R1280D002B: C1=C2=10
μ
F, C3=4.7
μ
F, C4=0.33
μ
F, 5=0.33
μ
F, C6=120pF,C7=50pF,C8=C10=C11=1
μ
F
This IC can be used 3 Output TFT Bias Circuit as shown above. V
OUT3
=2
×
V
OUT1
-Vf
Note: Maximum voltage tolerance of each component should be considered. With the transistor shown above is
appropriate to set up to +15V as V
OUT1
, -15V as V
OUT2,
30V as V
OUT3
I
EXTERNAL COMPONENTS
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 inverting side, Feedback (VFB2) pin voltage is controlled to maintain 0V, therefore,
Vrefout : R3=|-V
OUT2
|:R4
Thus, |-V
OUT2
|=Vrefout
×
R4/R3
Output Voltage is adjustable with R3 and R4.
2. How to set Soft Starting Time
As for R1280D002B, soft start time is adjustable with connecting a capacitor to DTC pin.
Soft starting time, T
SS1
and
T
SS2
are adjustable. Soft starting time can be set with the time constant of RC.
Soft starting time can be described as in next formula. (Topt=25
°
C)
T
SS1
RS1
×
C4, T
SS2
RS2
×
C5
In the above formulas, RS1 value is TYP. 32k
, while RS2 value is TYP. 45k
. Tolerance of these values is
±
25%
caused by dispersion of wafer process parameters.
On the other hand, as for R1280D002A/C, each soft start time is set with the time constant of each external resistor
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