gm7130hv Gamma Microelectronics, gm7130hv Datasheet - Page 7

• Manufacturer Part Number: gm7130hv
• Description: 3a Step Down Voltage Switching Regulators
• Manufacturer: Gamma Microelectronics

Test Circuit and Layout Guidelines
Careful layout is important with any switching regulators. 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&2 below should be
kept as short as possible. Single point grounding (as indicated or ground plane construction should
be used for best results. When using the Adjustable version, place the programming resistors as
close as possible to GM2576, to keep the sensitive feedback wiring short.
Unregulatedd
DC Input
Unregulatedd
V
IN
DC Input
V
IN
C
100µF
IN
Preliminary
Information
Figure 2 Adjustable Ouput Votlage Versions
V
1
IN
C
100µF
Figure 1 Fixed Ouput Votlage Versions
IN
V
IN
1
GM7130HV-ADJ
C
C
D1 = Schottky, MBR360
L1 = 100µH
C
C
D1 = Schottky
L1 = 100µH
V
where V
3
GND
OUT
IN
OUT
IN
OUT
= 100µF, 75V, Aluminum Electrolytic
= 100µF, 75V, Aluminum Electrolytic
= V
GM7130HV-x.x
= 1000µF, 25V, Aluminum Electrolytic
= 1000µF, 25V, Aluminum Electrolytic
3
GND
REF
REF
= 1.23V and R1 is between 1K to 5K
(1 + R2/R1)
5
ON/OFF
5
ON/OFF
4
FB
2
V
OUT
2
Output
4
Feedback
3A STEP DOWN VOLTAGE SWITCHING
D1
MBR360
100µH
L1
D1
D1
MBR360
100µH
L1
C
1000µF
GM7130HV
OUT
C
1000µF
OUT
R2
R1
V
OUT
L
O
A
D
REGULATORS
V
5.0V
OUT
L
O
A
D
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