S-817A11ANB-CUA-T2 SII [Seiko Instruments Inc], S-817A11ANB-CUA-T2 Datasheet - Page 17
S-817A11ANB-CUA-T2
Manufacturer Part Number
S-817A11ANB-CUA-T2
Description
SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
Manufacturer
SII [Seiko Instruments Inc]
Datasheet
1.S-817A11ANB-CUA-T2.pdf
(50 pages)
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Rev.3.0
The S-817 Series can be configured as a constant current circuit. Refer to Figure 15 and 16.
Constant amperage (I
I
Please note that it is impossible to set constant amperage I
value exceeding the drive ability of the S-817.
However, circuit (2) of Figure 16 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 of the device (V
recommended to attach a capacitor between the S-817 power source VIN and VSS pin or between
output VOUT and VSS pin because rush current flows at powering on. An example of input voltage
between V
O
V
_00
= (V
IN,
V
O
S-817A11ANB, S-817B11AMC, Tr : 2SK1213Y, R
OUT(E)
pins, Input voltage - I
IN
÷ R
and V
L
) +I
O
SS
in circuit (2) vs. I
.
O
) is calculated using the following equation (V
SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
O
0.60
0.50
0.40
0.30
0.20
0.10
0.00
current
1.4
11 Ω
Seiko Instruments Inc.
O
5.5 Ω
current characteristics
3.67 Ω
1.6
2.75 Ω
R
L
2.2 Ω
=1.83 Ω
1.8
V
IN
−V
O
1 :
(V)
1 kΩ, V
2
O
in case of circuit (1) of Figure 15 to the
O
2.2
=2 V
OUT(E)
: Effective output voltage):
2.4
S-817 Series
O
). It is not
17
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