S-812C View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
S-812C Datasheet PDF : 57 Pages
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Rev.7.0_01
16 V INPUT, 75 mA VOLTAGE REGULATOR
S-812C Series
3. ON/OFF pin
This pin starts and stops the regulator.
When the ON/OFF pin is set to OFF level, the entire internal circuit stops operating, and the built-in
P-channel MOS FET output transistor between the VIN pin and the VOUT pin is turned off, reducing
current consumption significantly. The VOUT pin becomes the VSS level due to the internally divided
resistance of several M between the VOUT pin and the VSS pin.
The structure of the ON/OFF pin is as shown in Figure 18. Since the ON/OFF pin is neither pulled down
nor pulled up internally, do not use it in the floating status. Note that if applying the voltage of VIN + 0.3 V
or more, the current flows to VIN via a parasitic diode in the IC.
When not using the ON/OFF pin in the product with the power-off function, connect the ON/OFF pin to
the VIN pin (in positive logic), or to the VSS pin (in negative logic).
The output voltage may increase by stopping regulation when a lower current (100 A or less) is
applied.
If the output voltage increased during power-off, pull the VOUT pin down to the VSS pin and set the
ON/OFF pin to the power-down level.
Table 12
Product Type
B
B
ON/OFF Pin
“L”: OFF
“H”: ON
Internal Circuit
Stop
Operate
VOUT Pin Voltage
VSS level
Set value
Current Consumption
ISS2
ISS
VIN
ON/OFF
VSS
Figure 18
4. Short-circuit protection circuit
In the S-812C Series, users are able to select whether to set the short circuit protection, which protects
the output capacitor from short-circuiting between the VOUT pin and the VSS pin.
The short circuit protection circuit controls the output current against voltage VOUT, as seen in “
Characteristics (Typical Data)”, “1. Output Voltage vs Output Current (When load current
increases)”, and limits the output current at approx. 40 mA even if the VOUT pin and the VSS pins are
short-circuited.
However, this short circuit protection circuit does not work as for thermal protection. Pay attention to the
conditions of input voltage and load current so that, under the usage condition including short circuit, the
loss of the IC will not exceed power dissipation of the package.
Even if pins are not short-circuited, this protection circuit works to limit the current to the specified value,
in order to protect the output capacitor, when the output current and the potential difference between
input and output voltages increase.
In the product without the short circuit protection circuit, the S-812C Series allows the relatively larger
current because this protection circuit is detached.
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