WHY5640 SUBMINIATURE TEMPERATURE CONTROLLER
January 8, 2002
WHY5640
Subminiature Temperature Controller
(BOTTOM VIEW)
GENERAL DESCRIPTION:
The WHY5640 is a general purpose analog PI
(Proportional, Integral) control loop for use in
thermoelectric or resistive heater temperature
control applications. The WHY5640 maintains
precision temperature regulation using an active
resistor bridge circuit that operates directly
with thermistors or RTD temperature sensors.
Supply up to 2 Amps of heat and cool current to
your thermoelectric from a single +5 Volt power
supply.
Connect two or more WHY5640 units together
and drive higher output currents.
FEATURES:
• + 5 to + 28V Operation
• Low Cost
• 0.008 ˚C Stability (typical)
• PI Temperature Control
• High ± 2 Amps Output Current
• Control Above and Below Ambient
• Small Package Size
Figure 1
Top View Pin Layout
and Descriptions
TOP VIEW
Buffer B
Thermoelectric Output B
Control Electronics Supply Ground
Power Drive Supply Ground
Power Drive Supply Input
Thermoelectric Output A
Control Electronics Supply Input
14
13
12
11
10
9
8
BUFB
OUTB
CGND
PGND
VS
OUTA
VDD
AGND
LIMB
LIMA
BUFA
PI
ERR
SENS
1
2
3
4
5
6
7
Analog Ground
Limit B
Limit A
Buffer A
Gain/Integrator Common
Temperature Error Output
Sensor and Setpoint Input
IF YOU ARE UPGRADE FROM THE WHY5640 to the WTC3243: The position of Pin 1 on the WHY5640
is reversed (or mirrored) relative to the position of Pin 1 on the WTC3243.
© 2001, 2003
WHY5640-00400-A Rev C
www.teamwavelength.com
WHY5640
© 2001, 2003
R
B
WHY5640 SHOWN WITHIN DASHED LINES
BLOCK DIAGRAM
External Connections
with Thermistor Operation
R
A
THERMISTOR
R
L
V
S
L
C
R
T
SETPOINT
TRIMPOT
R
S
R
G
V
DD
THERMOELECTRIC
COOLER
AGND
5
3
4
9
13
2
10
14
SENS
ERR
PI
OUTA
OUTB
BUFB
LIMB
VS
LIMA
BUFA
PGND
11
CGND
12
VDD
8
1
7
6
Voltage
Regulator
COOL
HEAT
+1V
+0.5 V
Ref .
Voltages
WHY5640-00400-A Rev B
+1V
+1V
+0.5 V
SENSOR BRIDGE AMPLIFIER
PROPORTIONAL/INTEGRAL CONTROL LOOP
VOLTAGE TO CURRENT CONVERTOR
H-BRIDGE POWER STAGE
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PAGE 2
WHY5640
PAGE 3
ELECTRICAL AND OPERATING
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
RATING
Supply Voltage 1 (Voltage on Pin 8)
Supply Voltage 2 (Voltage on Pin 10)
Output Current (See SOA Chart)
Power Dissipation, T
AMBIENT
= +25˚C
Operating Temperature, case
Storage Temperature
SYMBOL VALUE
V
DD
V
S
I
S
P
MAX
T
OPR
T
STG
+5 to +30
+3 to +30
±2.5
9
-40 to +85
-65 to +150
UNIT
Volts DC
Volts DC
Amperes
Watts
˚C
˚C
PARAMETER
TEMPERATURE CONTROL
Short Term Stability, 1 hour
Long Term Stability, 24 hour
Setpoint vs. Actual Temp
Accuracy
Control Loop
P (Proportional Gain)
I (Integrator Time Constant)
OUTPUT
Current, peak, see SOA chart
TEST CONDITIONS
MIN
TYP
0.005
0.008
<1%
MAX
0.01
0.01
UNITS
˚C
˚C
T
SET
= 25˚C using 10 kΩ thermistor 0.001
T
SET
= 25˚C using 10 kΩ thermistor 0.003
T
SET
= 25˚C using 10 kΩ thermistor
P
1
1
PI
100
10
A/V
Sec.
± 2.0
± 2.2
± 2.5
Amps
Volts
Volts
Volts
Compliance Voltage, Pin 9 to Pin 13 Full Temp. Range, I
S
= 100 mA
Compliance Voltage, Pin 9 to Pin 13 Full Temp. Range, I
S
= 1 Amp
Compliance Voltage, Pin 9 to Pin 13 Full Temp. Range, I
S
= 2 Amps
POWER SUPPLY
Voltage, V
S
Voltage, V
DD
Current, V
S
supply, Quiescent
Current, V
DD
supply, Quiescent
INPUT
Offset Voltage, initial
Bias Current
Offset Current
Common Mode Range
Common Mode Rejection
Power Supply Rejection
Input Impedence
THERMAL
Heatspreader Temperature Rise
Heatspreader Temperature Rise
Heatspreader Temperature Rise
T
AMBIENT
=25˚C
With WHS302 Heatsink, WTW002
Thermal Washer
With WHS302 Heatsink, WTW002
Thermal Washer, and 3.5 CFM Fan
© 2001, 2003
WHY5640-00400-A Rev B
Pin 5 and 7
Pins 5 and 7, T
AMBIENT
= 25˚C
Pins 5 and 7, T
AMBIENT
= 25˚C
Pins 5 and 7, Full Temp. Range
Full Temperature Range
Full Temperature Range
| VS - 1.7 | | VS - 1.4 |
| VS - 2.2 | | VS - 2.0 |
| VS - 3.3 | | VS - 2.6 |
5
5
45
10
28
28
90
15
Volts
Volts
mA
mA
1
20
2
0
60
60
85
80
500
2
50
10
mV
nA
nA
dB
dB
kΩ
V
DD
-1.5 V
28
18
3.1
30
21.5
3.4
33
25
3.9
˚C/W
˚C/W
˚C/W
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WHY5640
PAGE 4
PIN DESCRIPTIONS
PIN NO. PIN
1
NAME
FUNCTION
The analog ground connection is internally connected to Pins
11 and 12 (the power supply ground connections) and
eliminates grounds loops for stable operation of the sensor
amplifier bridge and limit current resistors.
AGND Analog Ground
2
LIMB
LIMIT B
A resistor connected between Pin 2 (LIMB) and Pin 1 (AGND)
limits the output current drawn off the Pin 10 (VS) supply input
and into Pin 13 (OUTB).
3
LIMA
LIMIT A
A resistor connected between Pin 3 (LIMA) and Pin 1 (AGND)
limits the output current drawn off the Pin 10 (VS) supply input
and into Pin 9 (OUTA). Also connect integrator capacitor C
L
to
Pin 3 (LIMA) when operating the WHY5640 as a standard PI
controller.
4
5
6
7
8
9
BUFA BUFFER A
PI
ERR
Connect Pin 4 (BUFA) to Pin 3 (LIMA) of another WHY5640
when operating the devices in a master/slave configuration.
Proportional Gain/ Integrator When using the WHY5640 as a standard PI controller, connect
Common
Temperature Error Input
one end of the proportional gain resistors R
G
and R
L
to Pin 5 (PI).
When using the WHY5640 as a standard PI controller, connect
one end of the proportional gain resistor R
G
to Pin 6 (ERR).
Pin 7 (SENS) is the common sensor bridge amplifier connection
for the sensor, R
T
, and setpoint, R
S
, resistors.
Power supply input for the WHY5640’s internal control
electronics. Supply range input for this pin is +5 to +28 Volts DC.
Connect Pin 9 (OUTA) to the negative terminal on your
thermoelectric when controlling temperature with Negative
Temperature Coefficient thermistors. Connect Pin 9 (OUTA) to
the positive thermoelectric terminal when using Positive
Temperature Coefficient RTDs.
SENS Sensor and Setpoint Input
VDD
Control Electronics Supply
Input
OUTA Thermoelectric Output A
10
VS
Power Drive Supply Input
Provides power to the WHY5640 H-Bridge Power Stage.
Supply range input for this pin is +5 to +28 Volts DC. The
maximum current drain on this terminal should not exceed 2.5
Amperes.
11
PGND Power Drive Supply Ground
Connect the V
S
power supply ground connection to Pin 11
(PGND). Pin 11 (PGND) and Pin 12 (CGND) are internally
connected.
12
13
CGND Control Electronics Supply
Ground
OUTB Thermoelectric Output B
Connect the V
DD
supply ground connection to Pin 12 (CGND).
Pin 12 (CGND) and Pin 11 (PGND) are internally connected.
Connect Pin 13 (OUTB) to the positive terminal on your
thermoelectric when controlling temperature with Negative
Temperature Coefficient thermistors. Connect Pin 13 (OUTB)
to the negative thermoelectric terminal when using Positive
Temperature Coefficient RTDs.
14
BUFB Buffer B
Connect Pin 14 (BUFB) to Pin 2 (LIMB) of another WHY5640
when operating the devices in a master/slave configuration.
IF YOU ARE UPGRADE FROM THE WHY5640 to the WTC3243: The position of Pin 1 on the WHY5640
is reversed (or mirrored) relative to the position of Pin 1 on the WTC3243.
© 2001, 2003
WHY5640-00400-A Rev B
www.teamwavelength.com
WHY5640
TYPICAL PERFORMANCE GRAPHS
PAGE 5
Caution:
Do not exceed the Safe Operating Area (SOA). Exceeding the SOA voids the warranty.
To determine if the operating parameters fall within the SOA of the device, the maximum voltage drop across the
controller and the maximum current must be plotted on the SOA curves.
These values are used for the example SOA determination:
Vs= 12 volts
Vload = 5 volts
ILoad = 1 amp
Follow these steps:
1.
2.
3.
4.
5.
6.
}
These values are determined from the specifications of the TEC or resistive heater
Determine the maximum voltage drop across the controller ,Vs-Vload, and mark on the X axis. (12volts - 5
volts = 7 volts, Point A)
Determine the maximum current, ILoad, through the controller and mark on the Y axis:
(1 amp, Point B)
Draw a horizontal line through Point B across the chart. (Line BB)
Draw a vertical line from Point A to the maximum current line indicated by Line BB.
Mark Vs on the X axis. (Point C)
Draw the Load Line from where the vertical line from point A intersects Line BB down to Point C.
Refer to the chart shown below and note that the Load Line is in the Unsafe Operating Areas for use with no heatsink
(1) or the heatsink alone (2), but is outside of the Unsafe Operating Area for use with heatsink and Fan (3).
25 C Ambient
75 C Case
© 2001, 2003
WHY5640-00400-A Rev B
www.teamwavelength.com
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