ACE301
High-precision Low Voltage Detector
Technology
Function description
High precision low temperature co-efficiency reference voltage is applied to the negative input of a
comparator. Input voltage, divided by resistor array of Ra Rb and Rc, is applied to the positive input of the
comparator. Output of the comparator controls a pair of NMOS and PMOS switches, generating the
hysteresis. Output of the comparator passes a series of buffer to drive the output CMOS pair.
+VDET, -VDET, VHYS can be calculated as follows:
-VDET =VREF*(1+Ra/(Rb+Rc))
+VDET =VREF*(1+(Ra+Rb)/Rb)=VREF *(1+(Ra+Rc)/Rb)
VHYS = +VDET-(-VDET)=VREF*(Ra+Rb+Rc)(1/Rb-1/(Rb+Rc))
VER 1.4
8
ACE [ ACE TECHNOLOGY CO., LTD. ]
