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L4909

EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR

STMicroelectronics 

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

FROM

RECTIFIER

ULTRAFAST FUSE

+5V

330nF

4.7K

PULL-UP

RESISTOR

SCR

VINA

(*)EN1

3

6

(*)EN2

7

VINB

13

VO1

2

VO2

14

VO3

11

(*)EN3

9

OC

5

TRIG

4

FB1

1

FB2

15

FB3

12

8

GND

RB3 RB2 RB1

100µF

RA3

RA2

RA1

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

Suggested value for RAx is 1.2KΩ

The value of RBx must be choosen, depending on the desired output voltage Vox? following the formula:

Vox

RBx = RAx 1.27 -1

100µF

100nF

D00AU1154

100µF

100nF

100nF

5/7

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