GM7230 Datasheet, PDF (6/12 Pages) List of Unclassifed Manufacturers – 3A STEP-DOWN VOLTAGE REGULATOR

GM7230
TEST CIRCUIT AND LAYOUT GUIDELINES
Careful layout is important with any switching regulator. Rapidly switching currents associated with wiring
inductance generate voltage transients which can cause problems. To minimize inductance and ground loops,
the lengths of the leads indicated by heavy lines in Figure 1 below should be kept as short as possible. Single-
point grounding (as indicated in Figure 1) or ground plane construction should be used for best results. When
using the Adjustable version, place the programming resistors as close as possible to the GM7230, to keep the
sensitive feedback wiring short.
Figure 1(a). Fixed Output Voltage Versions
V_IN
Unregulated
DC Input
Feedback
+V_IN
GM 7230-
4
1 ^{FIXED OUTPUT} _Output
L1
GND 3
2
ON/OFF 5
+
C_IN
D1
+
C_OUT
V_OUT
I
Current
meter
K1
C_IN - 470 µF, 50V, Aluminum Electrolytic
C_OUT - 220 µF, 25V, Aluminum Electrolytic
D1 - 5A, 40V Schottky
L1 - 68 µH, 3L Electronic Corp. TC-680M-3A-5026
6