Datasheet

MAX845
Isolated Transformer Driver
for PCMCIA Applications
______________________________________________________________________________________ 15
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)
• Simpler transformer
winding requirements
• Low output ripple
• 5 external
components
• Higher cost
• 2 diode drops
Voltage
Doubler
(Figure 11c)
• Fewest turns on
transformer
• 4 external
components
• Higher output
ripple
• 2 diode drops
___________________Chip Topography
V
CC
GND2
FS
0.085"
(2.159mm)
0.058"
(1.4732mm)
SD
D1 D2
GND1
SUPPLIERCAPACITOR
Low-ESR 267 Series
Matsuo
USA Phone: [phone]
FAX: [phone]
Ceramic
Murata Erie
USA Phone: [phone]
FAX: [phone]
Very Low-ESR 595D/293D
Series
Sprague Electric Co.
USA Phone: [phone]
FAX: [phone]
Table 3. Suggested Capacitor Suppliers
SUBSTRATE CONNECTED TO V
CC
TRANSISTOR COUNT: 31