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Rev.1.9 Oct.09, 2019

AX3111A



ELECTRICAL CHARACTERISTICS

(VCC = 12V, TA=25°C, unless otherwise specified)

Characteristics

Symbol

Conditions

Min

Typ

Max Units

Feedback Voltage

VFB

VCC = 10V~30V

IOUT = 0 to 1A

Tj=-20°C ~125°C

0.800 0.815 0.830

V

Quiescent Current

ICCQ

VFB=1.2V

force driver off

-

3

6

mA

Feedback Bias Current

IFB

IOUT=0.1A

-

0.1

0.5

uA

Shutdown Supply Current

ISD

VEN/SS =0V

-

3

6

mA

Current Limit

ICL

2.5

-

-

A

Adjustable frequency range

FOSC

50

-

380

KHz

Short frequency

FOSC1 VCC = 10V~30V

45

55

65

KHz

EN/SS Pin Shutdown Logic

input threshold voltage

VENL

-

-

0.8

V

EN/SS Pull high Current

IEN/SS VEN/SS=0V

-

5

-

uA

Internal MOSFET RDSON

RDSON VCC=12V, VFB=0V

-

130

180

mΩ

Efficiency

EFFI

VCC = 12V,

VOUT = 5V,

IOUT = 1A

-

90

-

%

VCC = 30V,

VOUT = 5V,

IOUT = 1A

86



APPLICATION CIRCUIT

C5

470uF

C4

470uF

1

2

L1

R1

5.6K

R4

1.1K

VIN+8~40V

VOUT = 5V/2A

D1

B340

C3

0.1uF

OSC

EN/SS

VGATE

VCC

GND

COMP

FB

SW

AX3111A

R1

R4

VFB = 0.815V ; R4 suggest 0.8K ~ 3k

VOUT = VFB x (1 +

)

C7

0.1uF

C6

0.1uF

R3

C1

1uF

C9

R2

C2

R5

C10

0.1uF

100R

18K

(Option)