Data Sheet

ADPL44002

analog.com

Rev. 0

15 of 23

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 by the following equation:

REN2 = nominally 10kΩ to 100kΩ

(4)

REN1 = REN2 × (VIN − 1.2V) /1.2V

(5)

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

ADPL44002

GND

CIN

2.2µF

COUT

2.2µF

EN

OFF

ON

VIN = 8V

VOUT = 6V

R1

10kΩ

R2

20kΩ

REN1

200kΩ

REN2

100kΩ