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

Rev.1.1 Oct.16, 2019

AX3133

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

Inductor Selection

For most designs, the different frequency can be reducing the inductor value; The

AX3133 is suggested 22µH to 100µH for 350K to 50KHz frequencies. Please refer the

below table to design.

L1 recommend value (VIN=8~32V ,VOUT=5V, IOUT=3A)

Frequency (Hz)

50K

150K

250K

350K

L1 Value (H)

100uH

68uH

33uH

22uH