5/7

L4909

The current protection is a function of the Vce, i.e. the drop between input and output voltages (Vin-Vo). The

shape of that relationship is shown in following figure 1.

Figure 1.

Figure 2. REGULATOR TYPICAL APPLICATION

(*)EN1

2

14

11

1

15

12

(*)EN2

(*)EN3

4.7K

PULL-UP

RESISTOR

100

µF

R

A3

R

A2

R

A1

+5V

ULTRAFAST FUSE

FROM

RECTIFIER

330nF

100nF

SCR

OC

FB3

FB2

FB1

V

O3

V

O2

6

3

8

13

7

9

5

4

V

O1

TRIG

GND

100

µF

100nF

100

µF

100nF

D00AU1154

(*) It is possible to enable the regulators connecting the ENx pins to Vin through a 25K

Ω

R

V

ox

1.27

-1