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GM7110-5.0TA5R Datasheet(PDF) 6 Page - Gamma Microelectronics Inc.

Part # GM7110-5.0TA5R
Description  1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
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Manufacturer  GAMMA [Gamma Microelectronics Inc.]
Direct Link  http://www.gammamicro.com.tw/
Logo GAMMA - Gamma Microelectronics Inc.

GM7110-5.0TA5R Datasheet(HTML) 6 Page - Gamma Microelectronics Inc.

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6
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 GM7110, to keep the
sensitive feedback wiring short.
V
IN
Unregulated
DC Input
+V
IN
1
+
C
IN
GND 3
5
2
Output
4
Feedback
L1
D1
MBR360
C
OUT
V
OUT
GM 7110
FIXED OUTPUT
+
ON/OFF
L
O
A
D
Figure 1(a). Fixed Output Voltage Versions
C - 100 µF, 75V, Aluminum Electrolytic
IN
C
- 330 µF, 25V, Aluminum Electrolytic
OUT
D1 - Schottky, MBR360
L1 - 330 µH,
R1 - 2k, 0.1%
R2 - 6.12k, 0.1%
3L Electronic Corp. TC-331M-1.0A- 5026
330 µH
330 µF
100 µF
A
A
MICROELECTRONICS
GM7110
1A STEP-DOWN VOLTAGE SWITCHING REGULATOR
Power Management


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