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

Rev.1.6 Sep.24, 2019

AX2005/A



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; the shutdown supply current is approximately 150uA.

PWM Control

The AX2005/A consists of DC/DC converters that employ a pulse-width modulation

(PWM) system. In converters of the AX2005/A, the pulse width varies in a range from 0 to

100%, according to the load current. The ripple voltage produced by the switching can

easily be removed through a filter because the switching frequency remains constant.

Therefore, these converters provide a low-ripple power over broad ranges of input voltage

and load current.

Current Limiting

The current limit threshold is setting by the internal circuit.

Compensation

In all LED driver applications. Connecting a resistor (R2) and a capacitor (C7) from

COMP pin to GND. Please refer the application circuit table to design.



APPLICATION INFORMATION

Setting the LED Current

Application circuit item shows the basic application circuit with adjustable output

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

)

5

R

V

(

I

FB

LED =

, VFB = 0.2V

Table 1 Resistor select for LED output current setting

ILED

R5

350mA

0.57Ω

70mW

750mA

0.266Ω

150mW

1000mA

0.2Ω

200mW