Smallest TEC Power Drivers for
Optical Modules
Typical Operating Characteristics (continued)
(V
DD
= 5V, circuit of Figure 1, T = +25°C, unless otherwise noted)
A
DIFFERENTIAL
OUTPUT VOLTAGE RIPPLE
V
RIPPLE
TEC CURRENT RIPPLE
MAX8520/21 toc06
DD
MAX8520/21 toc05
MAX8520/21 toc04
C = C = 1µF
2
7
1.5A
V
DD
20mV/div
V
- V
OS2 OS1
1mV/div
10mA/div
AC-COUPLED
AC-COUPLED
AC-COUPLED
0A
I
= 1A
TEC
I
= 1A
TEC
400ns/div
400ns/div
400ns/div
TEC CURRENT vs. CTLI VOLTAGE
ZERO-CROSSING TEC CURRENT
MAX8520/21 toc08
V
vs. TEC CURRENT
ITEC
MAX8520/21 toc07
3.0
2.5
2.0
1.5
1.0
0.5
0
V
CTLI
1V/div
V
CTLI
I00mV/div
0V
1.5V
0A
0A
I
TEC
1A/div
I
TEC
100mA/div
-2.0 -1.5 -1.0 -0.5
0
0.5 1.0 1.5 2.0
20ms/div
1ms/div
TEC CURRENT (A)
SWITCHING FREQUENCY
vs. TEMPERATURE
I
vs. AMBIENT TEMPERATURE
TEC
1100
0.520
FREQ = 1MHz
1000
900
800
700
600
500
400
0.510
0.500
0.490
0.480
0.470
0.460
0.450
V
R
= 1.5V
CTLI
TEC
= 1Ω
FREQ = 500kHz
FREQ = 1MHz
V
CTLI
R
TEC
= 2V
= 1Ω
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
6
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
