S-19680AAAH-K8T2U Datasheet, PDF (10/27 Pages) Seiko Instruments Inc – Current consumption during operation

FOR AUTOMOTIVE 105°C OPERATION CURRENT MONITOR HIGH SIDE SWITCH
S-19680 Series
Rev.1.1_00
 Standard Circuit
Input
C_IN^*1
R_SHUNT^*3
VIN
OUT
R_SENSE^*4
SENSE
R^*5
R^*5
VDD
ON / OFF
_____
SC
_____
OL
VSS
Output
CL^*2
Load short-circuit detection
signal output
Load open detection signal output
Single GND
GND
*1. C_IN is a capacitor for stabilizing the input.
*2. C_L is a capacitor for stabilizing the output.
*3. R_SHUNT is a shunt resistor for current monitor.
*4. R_SENSE is a sense resistor for current mo_{_}n_{__}it_{_}o_{_} r.
_____
*5. R is the external pull-up resistor for the SC pin or the O L pin.
Figure 11
Caution The above connection diagram and constants will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constants.
 Condition of Application
Input capacitor (C_IN):
Output capacitor (C_L):
Shunt resistor (R_SHUNT):
Sense resistor (R_SENSE):
External pull-up resistor (R):
A ceramic capacitor with 0.1 μF or more is recommended.
A ceramic capacitor with 0.1 μF or more is recommended.
5.1 Ω
5.1 kΩ
A resistor with 100 kΩ is recommended.
 Selection of Input Capacitor (C_IN) and Output Capacitor (C_L)
In the S-19680 Series, it is recommended to connect C_IN between the VDD pin and the VSS pin for stable operation.
In addition, in order to supply stable power to the load connected to the OUT pin, it is recommended to connect C_L
between the OUT pin and the VSS pin. The recommended capacitance for both C_IN and C_L is 0.1 μF or more.
Caution Perform thorough evaluation including the temperature characteristics with an actual application to
select C_IN and C_L.
 Selection of Shunt Resistor (R_SHUNT) and Sense Resistor (R_SENSE)
In the S-19680 Series, R_SHUNT and R_SENSE are required for the current monitor function. A resistor with 5.1 Ω can be
used for R_SHUNT and 5.1 kΩ for R_SENSE.
Select R_SHUNT and R_SENSE carefully since the accuracy of the limit current (I_LIM), the load short-circuit detection current
(I_SHORT) and the load open detection current (I_OPEN) are affected by R_SHUNT and R_SENSE characteristics. In addition, a
load current flows in R_SHUNT, so the heat generation must also be considered.
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