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Rev.1.1 Oct.16, 2019

AX3133



APPLICATION CIRCUIT

EL cap

C5

470uF

C4

470uF

1

2

L1

R1

5.6K

R4

1.1K

VIN+8~32V

VOUT = 5V/3A

D1

B340

C3

0.1uF

OSC

EN/SS

VGATE

VCC

GND

COMP

FB

SW

AX3133ES

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

(Option)

Compensation Table

COUT ESR Range

Frequency(Hz)

VIN RANGE

R2

C9

C2

L1

30m~80mΩ

50K

8~30V

100R

4n7

3300p

100u

150K

100R

4n7

1500p

68u

250K

470R

10n

1500p

33u

350K

470R

1n

680p

22u

80m~300mΩ

50K

100R

4n7

3300p

100u

150K

100R

4n7

820p

68u

250K

470R

10n

1500p

33u

350K

100R

4n7

180p

22u



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.