R3113D

10

OPERATION

OUT

GND

Vref

Ra

Rb

Rc

Pch

Nch

Comparator

Figure 1. Block Diagram

Supply Voltage

Output Voltage

Detector Threshold

Hysteresis

12

3

4

5

A

B

Minimum Operating Voltage

GND

GND

Step

1

2

3

4

5

Comparator

Pin Input Voltage

I

II

III

IV

V

Comparator

Output

H

L

Inde-finite

L

H

Tr.1

OFF ON Inde-finite ON OFF

Pch

ON OFF Inde-finite OFF ON

Output

Tr.

Nch

OFF ON Inde-finite ON OFF

Rb

+ Rc

I.

Ra

+ Rb + Rc

Rb

II.

Ra

+ Rb

Figure 2. Operation Diagram

and output voltage becomes to GND level. The voltage level of Point A means detector threshold voltage,

or (

Step 3. When the supply voltage is less than minimum operating voltage, the operation of output transistor

voltage.

Step 4. The output voltage equals to GND level.

∗ The difference between released voltage and detector threshold voltage is the detector threshold hysteresis.