MAX845 Ver la hoja de datos (PDF) - Maxim Integrated

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MAX845

Isolated Transformer Driver for PCMCIA Applications

Maxim Integrated 

Isolated Transformer Driver

for PCMCIA Applications

Table 2. Rectifier Topology Trade-Offs

TOPOLOGY

ADVANTAGE

DISADVANTAGE

2-Diode

Push/Pull

(Figure 11a)

• Only 3 external

components

• Low output ripple

• Single diode drop

• More turns on

transformer

4-Diode

Bridge

(Figure 11b)

Voltage

Doubler

(Figure 11c)

• 5 external

• Simpler transformer components

winding requirements

• Higher cost

• Low output ripple

• 2 diode drops

• Fewest turns on

transformer

• 4 external

components

• Higher output

ripple

• 2 diode drops

Table 3. Suggested Capacitor Suppliers

CAPACITOR

Low-ESR 267 Series

SUPPLIER

Matsuo

USA Phone: (714) 969-2491

FAX: (714) 960-6492

Ceramic

Murata Erie

USA Phone: (800) 831-9172

FAX: (404) 436-3030

Very Low-ESR 595D/293D

Series

Sprague Electric Co.

USA Phone: (603) 224-1961

FAX: (603) 224-1430

___________________Chip Topography

D1

D2

GND1

FS

SD

0.058"

(1.4732mm)

0.085"

(2.159mm)

GND2

VCC

SUBSTRATE CONNECTED TO VCC

TRANSISTOR COUNT: 31

______________________________________________________________________________________ 15

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