S-817B50AUA-CXNT2G 查看數據表（PDF） - Seiko Instruments Inc

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S-817B50AUA-CXNT2G

SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR

Seiko Instruments Inc 

Rev.4.2_00

SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR

S-817 Series

The S-817 Series can be configured as a constant current circuit. Refer to Figure 16 and 17.

Constant amperage (IO) is calculated using the following equation (VOUT(E): Effective output voltage):

IO = (VOUT(E) ÷ RL) +ISS.

Note that by using a circuit in Figure16, it is impossible to set the better driving ability to the constant

amperage (IO) than the S-817 Series basically has.

To gain the driving ability which exceeds the S-817 Series, there’s a way to combine a constant current

circuit and a current boosting circuit, as seen in Figure 17.

The maximum input voltage for a constant current circuit is 10 V + the voltage for device (VO).

It is not recommended to add a capacitor between the VIN (power supply) and VSS pin or the VOUT

(output) and VSS pin because the rush current flows at power-on.

The following is a characteristics example of input voltage between VIN and VO vs. IO current (Typ. Ta

= 25°C) in constant current boosting circuit in Figure 17.

VIN, VO pins, Input voltage - IO current

S-817A11ANB, S-817B11AMC, Tr : 2SK1213Y, R1 : 1 kΩ, VO=2 V

0.60

RL=1.83 Ω

0.50

2.2 Ω

0.40

2.75 Ω

0.30

3.67 Ω

5.5 Ω

0.20 11 Ω

0.10

0.00

1.4

1.6

1.8

2

VIN−VO(V)

2.2

2.4

Seiko Instruments Inc.

17

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