Data Sheet

ADPL42002

analog.com

Rev. 1

15 of 22

Figure 28. Typical VOUT Response to EN Pin Operation

The upper and lower thresholds are user-programmable and can be set higher than the nominal 1.2V threshold by

using two resistors. The resistance values, REN1 and REN2, can be determined from the following:

REN2 = nominally 10kΩ to 100kΩ

(5)

REN1 = REN2 × (VIN − 1.2V)/1.2V

(6)

Where VIN is the desired turn-on voltage.

The hysteresis voltage increases by the factor (REN1 + REN2)/REN2. For the example shown in Figure 29, the enable

threshold is 3.6V with a hysteresis of 300mV.

Figure 29. Typical EN Pin Voltage Divider

Figure 28 shows the typical hysteresis of the EN pin. This prevents on/off oscillations that can occur due to noise on

the EN pin as it passes through the threshold points.

VEN (V)

1.30

1.25

1.20

1.15

1.10

1.05

0

0.5

1.0

1.5

2.0

2.5

3.5

3.0

–40°C

+25°C

+125°C

VOUT

SENSE/ADJ

VIN

ADPL42002

GND

CIN

2.2µF

COUT

2.2µF

EN

OFF

ON

VIN = 8V

VOUT = 6V

R1

2kΩ

R2

10kΩ

REN1

200kΩ

REN2

100kΩ

SS

CSS

1nF