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參數(shù)資料
| 型號(hào)： | S-817B14AMC-CWD-T2 |
| 廠商： | Seiko Instruments Inc. |
| 英文描述： | SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR |
| 中文描述： | 超小型封裝CMOS電壓穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 11/28頁(yè) |
| 文件大?。?/td> | 412K |
| 代理商： | S-817B14AMC-CWD-T2 |
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Rev.2.3
S-817 Series
ULTRA COMPACT CMOS VOLTAGE REGULATOR
Seiko Instruments Inc.
11
2. Constant Current Circuit
The S-817 Series can be configured as a
constant current circuit. See Figure 11.
Constant amperage I
O
is calculated using
the following equation
(V
OUT
(E): Effective output voltage):
I
O
= (V
OUT
(E)
÷
RL) +I
SS
.
Please note that it is impossible to set
constant amperage I
O
in case of circuit
(1) of Figure 11 to the value exceeding
the drive ability of the S-817.
However, circuit (2) of Figure 11 is an
example to set constant amperage to the
value exceeding the drive ability of the S-
817. Circuit (2) incorporates a current
boosting circuit. The maximum input
voltage of the constant current circuit is
the value obtained by adding 10 V to
voltage V
O
of the device. It is not
recommended to attach a capacitor
between the S-817 power source VIN and
VSS pins or between output VOUT and
VSS pins because rush current flows at
powering on. An example of input
voltage between V
IN
and VO in circuit (2)
vs. I
O
current characteristics
(Ta = 25
°
C, typ.) is illustrated in Figure 12.
3. Output Voltage Adjustment Circuit
The output voltage can be boosted by using the
configuration shown in Figure 13. The output Voltage
V
O
can be calculated using the following equation
(V
OUT
(E):Effective output voltage):
V
O
= V
OUT
(E) x (R1 + R2)
÷
R1 + R2 x I
SS
Set R1 and R2 to high values of resistance so as not to
be affected by current consumption I
SS.
Capacitor C1 is effective in minimizing output
fluctuation at powering on or due to power or load
fluctuation. Determine the optimum value on your
actual device.
It is not also recommended to attach a
capacitor between the S-817 power
source VIN and VSS pins or between
output VOUT and VSS pins because
output
fluctuation
powering on might occur.
or
oscillation
at
I
(2) Constant Current Boosting Circuit
Figure 11 Constant Current Circuit
R1
GND
Device
RL
VOUT
V
IN
V0
C
IN
VSS
S-817
Series
Tr1
V
O
GND
Device
RL
VOUT
VIN
V
IN
V0
V
O
I
O
C
IN
VSS
(1) Constant Current Circuit
S-817
Series
o
0.00
0.10
0.20
0.30
0.40
0.50
0.60
1.4
1.6
1.8
V
IN
-V
O
(V)
2
2.2
2.4
Io (A)
S-817A11ANB, S-817B11AMC;
V
IN
-V
O
pins, Input voltage-I
O
current
Tr: 2SK1213Y, R1: 1k
,V
O
=2V
RL
=
1.83
2.2
2.75
3.67
5.5
11
GND
V0
R2
R1
VOUT
VIN
V
IN
C
L
C1
C
IN
VSS
Figure 13 Voltage Adjustment Circuit
S-817
Series
Figure 12 Input Voltage vs Current Characteristics
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