Wavelength Electronics WTC3293, Datasheet And Operating Manual

Page: 3 / 36

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WTC3243 TEMPERATURE CONTROLLER
R1
R1 = 10 kΩ, ¼ W resistor
SENSOR-
Simulated Thermistor
R
LOAD
OUTB
OUTA
R
LOAD
= 1 Ω, Rated >25 W
Thermal Test Load
QUICK CONNECT GUIDE, cont’d
V
S
V
DD
TIE GROUND CONNECTIONS DIRECTLY TO PIN 13
1
WTC3243
Temperature
Controller
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Actual
Temperature
Monitor voltage
V
DD
R
T
R
BIAS
R
I
R
P
R
LIMA
R
LIMB
Adjusting PI
Control Loop
Adjusting Limit
Currents
V
SET
VSET = Sensor Resistance X Sensor Bias Current
1
1
-
+
TOP VIEW
NC
OR
D/A
V
DD
Bandgap
Voltage
Reference
W
CCW
OR
Figure 3. WTC3243 Quick Connect for TEC with Thermistor
Figure 4. Recommended Test Loads
QUICK CONNECT LEGEND
FUNCTION WTC3243 & EVAL BOARD WTC3243 ALONE
Limits Adjust LIMA & LIMB
Table 6 on page 17
Equation 5
R
LIMA
& R
LIMB
Table 9 on page 25
Control Parameters
PGAIN
Table 5 on page 14
Equation 1
R
P
Table 11 on page 27
I TERM
Table 5 on page 14
Equation 3
R
I
Table 12 on page 27
Bias Current
Sensor Bias Switch
Table 4 on page 13
Figure 8
R
BIAS
Table 10 on page 26
Equation 6 & Equation 7
Gain Jumper
Table 10 on page 26
Figure 9
R
G
Table 10 on page 26
Equation 8
Thermistor (R
T
) See Thermistor datasheet
The same values can more simply be determined using the Circuit Design Calculator, available online at:
www.teamwavelength.com/support/design-tools/wtc-calculator/ . Wavelength recommends using this utility.
RECOMMENDED TEST LOAD
For setup and configuration, we recommend using a test
load in place of the TEC or resistive heater, connected
directly to Pin 11 and Pin 12 on the controller, as shown in
Figure 4 .
Recommended test load:
• MP9100-1.00-1%. This resistor may need to be attached
to a heatsink.
We also recommend using a test circuit to simulate a 10 kΩ
thermistor. Figure 4 shows a simple adjustment test circuit.