Smallest TEC Power Drivers for
Optical Modules
V
DD
L1
4.7µF
V
LX1
DD
REF
C2
1µF
C1
1µF
CS
R2
R
SENSE
0.09Ω
PV
1
DD
OS1
OS2
C3
1µF
R
THER
PGND1
C5
10µF
U1
PV
2
DD
MAX8521
C4
1µF
PGND2
REF
L2
4.7µF
LX2
C6
0.1µF
C7
1µF
V
DD
COMP
C8
0.1µF
MAXIP
MAXIN
FREQ
ITEC
49.9kΩ
100kΩ
ON
OFF
MAXV
SHDN
CTLI
GND
0.022µF
10µF
1µF
10kΩ
243kΩ
U3A
MAX4477
U2
510kΩ
TO
MAX4475
U3B
OUTPUT
100kΩ
10kΩ
REF
V
DD
U4
DAC
INPUTS
MAX5144
U3B
MAX4477
Figure 1. MAX8521 Typical Application Circuit
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