hytek
HY-5610
Microsystems
TEC CONTROLLER
hytek Microsystems 400 Hot Springs Rd. Carson City NV 89706 (702) 883-0820 Fax -0827 www.hytek.com
Figure3 illustrates the locus of operating
current and voltage for two different TECs.
Example 1:
A supply voltage of5 Volts was chosen for
use with the ITI Ferro Tek Model
6300/018/018A TEC. This device is rated for
a maximum current of 1.8 Amperes at a
maximum allowable voltage of 2.7 Volts.
This isa load resistance of approximately
1.5 ohms. The intersection of the 1.5 ohm
load line and the HY-5610 current source
characteristic's define the locus of operation
voltage and current for both the HY-5610
and the TEC. In this application the current
was limited to 1.8 Amperes when cooling and
to 0.6 Amperes when heating by proper
selection of R
& R
.
CC
CH
Example 2:
A supply voltage of 12 Volts was chosen for
the Melcor FC 0.45-66-05 TEC. This device
hasa maximum rated voltage of 7.98 Volts
ata current of 0.8 Amperes. A load line for
this device is also shown on the plot. Once
again maximum turn on current is set by
proper selection of R
& R
.
CC
CH
Note that the power dissipated in the HY-
5610 never exceeds the6 Watt maximum
power dissipation in both of these examples.
1
2
3
4
5
6
7
8
9
10
1.0
2.0
11
12
0
0
13
14
15
SUPPLY VOLTAGE( V
)
S
PIN 10 TO GROUND (PIN 11& 12)
CONSTANT
POWER
CURVE=6 WATTS
VOLTS
HY-5610 CURRENT SOURCE
CHARACTERISTICS
1
2
3
4
5
6
7
8
9
10
1.0
2.0
11
12
0
0
13
14
15
VOLTS
DETERMINATION OF THE
HY-5610 OPERATING
POINTS USING LOAD LINES
LOAD LINE FOR A
ITI Ferro Tec MODEL
6300/018/018A TEC (1.5 )
Ω
Figure2 illustrates the characteristics of
the HY-5610 power drive section. It also
illustrates the unsafe operating area
where the power dissipated in the device
exceeds the maximum6 watt rating.
This curve applies for both heating and
cooling operation.
Note that the resistance of the power
drive section is approximately one ohm
when the HY-5610 is fully turned on.
ON RESISTANCE
OF CURRENT
SINK
UNSAFE
OPERATING
AREA
UNSAFE
OPERATING
AREA
LOAD LINE FOR
A MELCOR MODEL
FC 0.45-66-05 TEC
FIGURE 3
SUPPLY VOLTAGE( V
)
S
PIN 10 TO GROUND (PIN 11& 12)
FIGURE 2
11/97
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