GM7109 データシートの表示（PDF） - Gamma Microelectronics Inc.

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GM7109

150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS

Gamma Microelectronics Inc. 

GM7109

150KHz, 2A STEP DOWN VOLTAGE

SWITCHING REGULATORS

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 GM7109, to keep the sensitive feedback wiring short.

1

VIN

VIN

Unregulatedd

DC Input

CIN

100µF

3

FB

GM7109-x.x

2

5~8

4

VOUT

GND

SD

L1

100µH

D1

VOUT

COUT

L

680µF O

A

D

Figure 1 Fixed Ouput Votlage Versions

CIN = 470µF, Aluminum Electrolytic

COUT = 220µF, 25V, Aluminum Electrolytic

D1 = Schottky, 5A/40V

L1 = 68µH

1

VIN

VIN

Unregulatedd

DC Input

CIN

100µF

GM7109-A

5~8

4

GND

SD

3

FB

2

VOUT

L1

100µH

D1

COUT

680µF

VOUT

R2 L

O

A

R1 D

Figure 2 Adjustable Ouput Votlage Versions

CIN = 470µF, Aluminum Electrolytic

COUT = 220µF, 25V, Aluminum Electrolytic

D1 = Schottky, 5A/40V

L1 = 68µH

VOUT = VREF (1 + R2/R1)

6

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