Rainbow-electronics MAX1664 Bedienungsanleitung PDF herunterladen (Seite 14)

MAX1664

Active-Matrix Liquid Crystal Display

(AMLCD) Supply

14 ______________________________________________________________________________________

Figure 7a. MAX1664 Component Placement Guide Figure 7b. MAX1664 PC Board Layout—Component Side

1.0"

Supply Connections and Layout

The MAX1664 performs both precision analog and

high-power switching functions. Carefully plan supply

connections, bypassing, and layout. Bypass IN and INP

with a 33Ω isolation resistor (R9, Figure 4) between

them. In addition, sufficient low-ESR bypassing must be

provided on the INP bus to ensure stability of DC-DC 1.

A solid ground plane under the power components,

with a separate ground plane under the analog nodes,

is highly recommended. These ground planes should

be connected at a single, quiet point. Analog reference

and feedback signals should be referred to and routed

over the analog ground plane. Figure 7 shows a typical

layout using separate ground planes.

REF

FB2-

LX2P

LX2N

FB2+

PGND2

0.47µF

0.22µF

OUT

4.7µF

OUT2-

-20V

OUT2+

28V

MAX1664

Figure 6. V

OUT2

- Voltage-Doubler Charge Pump

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Rainbow-electronics MAX1664 Bedienungsanleitung Seite 14