S-812C View Datasheet(PDF) - Unspecified
Part Name
Description
MFG CO.
'S-812C' PDF : 57 Pages View PDF
Rev.7.0_01
16 V INPUT, 75 mA VOLTAGE REGULATOR
S-812C Series
2. Constant current circuit
This circuit can be used as a constant current circuit if making the composition seen in Figure 20 and
21. Constant current IO is calculated from the following equation (VOUT(E) = actual output voltage):
IO = (VOUT(E) RL) + ISS
Note that by using a circuit in Figure 20, it is impossible to set the better driving ability to the constant
amperage (IO) than the S-812C Series basically has.
To gain the driving ability which exceeds the S-812C Series, there’s a way to combine a constant
current circuit and a current boosting circuit, as seen in Figure 21.
The maximum input voltage for a constant current circuit is 16 V + the voltage for device (VO).
It is not recommended to add a capacitor between the VIN pin (power supply) and the VSS pin or the
VOUT pin (output) and the VSS pin because the rush current flows at power-on.
VIN
GND
VIN S-812C VOUT
Series
VSS ON/OFF RL VOUT
CIN
VO IO Device
Figure 20 Constant Current Circuit
Tr1
VIN
GND
VIN S-812C
R1
Series
ON/OFF VSS
CIN
VOUT
RL VOUT
VO IO Device
Figure 21 Constant Current Boost Circuit
3. Output voltage adjustment circuit
(Only for S-812CxxA Series (Unavailable short-circuit protection and power-off function))
By using the composition seen in Figure 22, users are able to increase the output voltage. The value of
output voltage VOUT1 is calculated from the following equation (VOUT(E) = actual output voltage):
VOUT1 = VOUT(E) (R1 + R2) R1 + R2 ISS
Set the value of resistors R1 and R2 so that the S-812C Series is not affected by current consumption
ISS.
Capacitor C1 reduces output fluctuation due to power-on, power fluctuation and load fluctuation. Set the
value according to the actual evaluation.
It is not recommended to add a capacitor between the VIN pin (power supply) and the VSS pin or the
VOUT pin (output) and the VSS pin because it causes output fluctuation and output oscillation due to
power-on.
VIN VIN S-812C
Series
GND
VSS
CIN
C1
VOUT
R1
R2
VOUT1
CL
Figure 22
23
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