© 2022
10
WTC3243 TEMPERATURE CONTROLLER
ELECTRICAL SPECIFICATIONS — W WTC3243
PARAMETER
SYMBOL
WTC3293
UNIT
POWER SUPPLY
Power Supply Voltage
V
DD
= +4.5 to +30
V
S
= +3 to +30
Volts
Enable LED
will not turn on
when less than 3.5 V
Quiescent Current
V
DD-QUIESCENT
= 8
V
S-QUIESCENT
= 10.5
mA
Fan Current Draw
5 V fan → 150
12 V fan → 100
mA
Minimum Current Rating
V
DD
= 1.1 * (V
DD-QUIESCENT
+ fan)
V
S
= 1.1 *(I
TEC
+ V
S-QUIESCENT
)
Amps
BIAS CURRENT
Bias Current Selection
10 µA, 100 µA, 1 mA, 10 mA
Bias Current Accuracy
1
%
EXTERNAL SETPOINT AND MONITORS
RSET Voltage Range
0 - 6.5
Volts
RSET Damage Threshold
RSET
< -0.7 or > min(V
DD
+ 0.7, 6.5)
Volts
RSET low end is affected by the
DAQ Failsafe Protection circuit
HSET Voltage Range
0 - [V
DD
-2.5]
Volts
HSET Damage Threshold
HSET
< -0.7 or > V
DD
+ 0.7
Volts
SET T MON output voltage range
0 - 6.5 (VSET = X)
0 - 2.5 (VSET = T)
Volts
X is the external setpoint jumper
T is the internal trimpot jumper
ACT T MON output voltage range
0 to V
DD
Volts
Limited by bias current circuit
(1)
Sensor Voltage to ACT T MON Accuracy
0.1 to 1
mV
SET T MON to ACT T MON Accuracy
0.1 to 3 (2 typical)
mV
RSET T (or HSET T) vs. SET T MON
Accuracy
0.1
mV
Input Impedance
RSET
200
kΩ
HSET
1
MΩ
FEEDBACK LOOP
Proportional Gain
PGAIN
1 - 65
A / V
With different resistor,
Proportional Gain range can be
increased to 100 A / V.
Integrator Time Constant
ITERM
0.53 - 4.5
Seconds
Integrator trimpot turned fully
clockwise (CW) = longer time
constant, lower resistance.
Trimpot turned fully counter-
clockwise (CCW) = shorter time
constant, higher resistance.
(1)
The bias source has a compliance up to V
DD
- 2 V. In normal operation this limits the sensor voltage range from 0 V to V
DD
- 2 V. While
voltages up to ±5 V outside this range on the VSET pin will not damage the unit, it will not provide proper control under these conditions.
