XC6118_1 Datasheet, PDF (13/20 Pages) Torex Semiconductor – Voltage Detector with Separated Sense Pin & Delay Capacitor Pin

XC6118
Series
■NOTES ON USE
1. Use this IC within the stated maximum ratings. Operation beyond these limits may cause degrading or permanent damage
to the device.
2. The power supply input pin voltage drops by the resistance between power supply and the VIN pin, and by through current at
operation of the IC. At this time, the operation may be wrong if the power supply input pin voltage falls below the minimum
operating voltage range. In CMOS output, for output current, drops in the power supply input pin voltage similarly occur.
Moreover, in CMOS output, when the VIN pin and the sense pin are short-circuited and used, oscillation of the circuit may
occur if the drops in voltage, which caused by through current at operation of the IC, exceed the hysteresis voltage. Note it
especially when you use the IC with the VIN pin connected to a resistor.
3. When the setting voltage is less than 1.0V, be sure to separate the VIN pin and the sense pin, and to apply the voltage over
1.0V to the VIN pin.
4. Note that a rapid and high fluctuation of the power supply input pin voltage may cause a wrong operation.
5. Power supply noise may cause operational function errors, Care must be taken to put the capacitor between V_IN-GND and
test on the board carefully.
6. When there is a possibility of which the power supply input pin voltage falls rapidly (e.g.: 6.0V to 0V) at release operation
with the delay capacitance pin (Cd) connected to a capacitor, use a Schottky barrier diode connected between the VIN pin
and the Cd pin as the Figure 3 shown below.
7. In N channel open drain output, V_OUT voltage at detect and release is determined by resistance of a pull up resistor
connected at the V_OUT pin. Please choose proper resistance values with refer to Figure 4;
During detection: V_OUT = V_PULL / (1+R_PULL / R_ON)
V_PULL: Pull up voltage
R_ON(※1)：On resistance of N channel driver M3 can be calculated as V_DS / I_OUT1 from electrical characteristics,
For example, when (※2) R_ON = 0.5 / 0.8×10^-3 = 625Ω（MIN.）at V_IN=2.0V, V_PULL = 3.0V and V_OUT ≦0.1V at detect,
R_PULL= (V_PULL /V_OUT-1)×R_ON= (3 / 0.1-1)×625≒18ｋΩ
In this case, R_PULL should be selected higher or equal to 18kΩ in order to keep the output voltage less than 0.1V during
detection.
(※1) R_ON is bigger when V_IN is smaller, be noted.
(※2) For calculation, Minimum V_IN should be chosen among the input voltage range.
During releasing：V_OUT = V_PULL / (1 + R_PULL / R_OFF)
V_PULL：Pull up voltage
R_OFF：On resistance of N channel driver M3 is 15MΩ（MIN.） when the driver is off (as to V_OUT / I_LEAK)
For example：when V_PULL = 6.0V and V_OUT ≧ 5.99V,
R_PULL = (V_PULL / V_OUT-1)×R_OFF = (6/5.99-1)×15×10⁶ ≒25 kΩ
In this case, R_PULL should be selected smaller or equal to 25 kΩ in order to obtain output voltage higher than 5.99V during
releasing.
VIN
VSEN
R=100kΩ
(No resistor needed for
CMOS output products)
VIN
VSEN
M2
ＲＳEN=R1+R2+R3
Comparator
R1
Rdelay
M4
Inverter
VIN
VSEN
VIN
VSEN
VOUT
VOUT
R2
Vref
M3
M5
M1
Cd
R3
Cd
VSS
Cd
Cd
VOUT
VSS
Figure 3: Circuit example with the delay capacitance pin (Cd)
connected to a Schottky barrier diode
NOTE：R_OFF=V_OUT/I_LEAK
Figure 4: Circuit example of XC6118N Series
13/20