4/13

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

Rev.1.5 Oct.15, 2019

AX3117



APPLICATION CIRCUIT

)

1

R

2

R

+

1

(

×

V

0

.

1

=

V

OUT

L1 recommend value (VIN=10~36V ,VOUT=5V)

Version

AX3117/B

AX3117A

L1 Value (H)

66u

33u



FUNCTION DESCRIPTIONS

SENSE1/2

The current limit sense pin, if VSENSE1-VSENSE2≧140mV, the over current is happened

that it can turn-off driver cycle by cycle.

EN/CT

The pin is enable/shutdown and auto restart control functions. When system is

normal operating, this pin is enable/shutdown function. Pulling this pin below a threshold

voltage of under 0.3V shuts the regulator off, and pulling this pin from 0.5V to 1.5V turns

the regulator on. However when VOUT is short (VFB<0.4V), the auto restart function can be

started that restart the regulator cycle by cycle. The cycle time is set by outside capacitor

(C10). Please refer the below waveform and formula, the t2 cycle is regulator off time and

t1 cycle is current limit time. The charge-current is 26uA and discharge-current is 1.8uA.