
VB409 / VB409SP
Figure 1: Application scheme
MAIN
INPUT
Vref2
GND
Vref3
Input current
li miter
Thermal
protection
Vref1
Output current
limiter
Cap
C1
+
R1
Threshold
R2
OUTPUT
VB049a1
RLOAD
APPLICATION EXAMPLE
(without heatsink; R1=1MΩ; C1=47µF)
IOUT
10 mA
15 mA
20 mA
(without heatsink; R1=1MΩ; C1=100µF)
IOUT
20mA
25mA
30mA
35mA
40mA
R2
560 KΩ
470 KΩ
390 KΩ
R2
390 KΩ
330 KΩ
270 KΩ
220 KΩ
180 KΩ
PAV
0.32 W
0.49 W
0.67 W
PAV
0.70 W
0.92 W
1.20 W
1.53 W
1.92 W
4/9
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