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Axelite Confidential Materials, do not copy or distribute without written consent.

Rev.2.3 Oct.09, 2019

AX3111



FUNCTION DESCRIPTIONS

EN/SS

This pin can be supplied shutdown or soft start function. It is inside pull high function.

For normal application, the pin must be connected a capacitor to ground. There is a 5uA

current to charge this capacitor, vary the different capacitor value to control soft start time.

Allow the switching regulator circuit to be shutdown pulling this pin below a 0.8V threshold

voltage.

OSC

External frequency set pin. The pin connects a resistance (R3) to reduce system

frequency. This converter’s frequency can be set from 50K to 350KHz, please refer the

below table to set frequency.

T=Room Temperature

R3 (Ω)

10M

240K

110K

68K

Frequency (Hz)

52K

150K

250K

350K

COMP

Compensation pin. For EL output capacitor application, the COMP pin connects R2 and

C9 to ground for all condition; please refer the compensation table.



APPLICATION INFORMATION

Setting the Output Voltage

Application circuit item shows the basic application circuit with adjustable output

version. The external resistor sets the output voltage according to the following equation:











 





4

1

1

815

0

R

R

V

V

OUT

.

Table 1 Resistor select for output voltage setting

VOUT

R4

R1

5V

1.1K

5.6K

3.3V

2.7K

8.2K