Power Management
A A
MICROELECTRONICS
GM7230
3A STEP-DOWN VOLTAGE REGULATOR
Power Management
Figure 1(b). Adjustable Output Voltage Versions
Feedback
4
+V
IN
GM 7230-ADJ
L1
V
OUT
=5.0V
1
Output
2
GND
3
5
ON/ OFF
R2
Unregulated
+
+
L
DC Input
C
O
A
D
D1
IN
C
OUT
R1
R2
R1
V
OUT
= V
( 1 +
)
REF
V
OUT
R2 = R1 (
-1)
V
REF
where V
= 1.23V, R1 aproximetly 1kW, 1%
REF
C
- 470 µF, 50V,Aluminum Electrolytic
IN
C
- 220 µF, 25V,Aluminum Electrolytic
OUT
D1 - 5A, 40V Schottky
L1 - 68 µH, 3L Electronic Corp. TC-680M-3A-5026
R1 - 1k , 1%
= 5V, R2 = 3.06k , 1%
V
OUT
7