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PDF DN1220 Data sheet ( Hoja de datos )
| Número de pieza | DN1220 | |
| Descripción | SUBMINIATURE THERMOELECTRIC COOLER CONTROLLER | |
| Fabricantes | thermoptics | |
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™
DATA SHEET
DN1220
SUBMINIATURE THERMOELECTRIC COOLER CONTROLLER
General Description
The DN1220 is a subminiature Bipolar Temperature
Controller for Thermoelectric Coolers (TEC) used in
fixed temperature OEM applications. The device is
designed to operate with a Negative Temperature
Coefficient (NTC) thermistor that senses the temperature
of the object attached to the TEC. Temperature is set
with a user selected resistor. Temperature stability of
0.01°C is achieved by the linear Proportional Integral (PI)
control loop of the DN1220.
Proportional gain and integrator time constants are set
independently with resistors. No external integrator
capacitor is needed. These parameters can be
optimized to minimize temperature overshoot and
stability. In addition, the maximum cooling and heating
current supplied to the TEC can be adjusted
independently from 0 to 2 amperes with two resistors.
Features
• Proportional and Integral Control
• Gain and Integrator Time Constants set with
Single Resistors. No External Integrator
Capacitor Needed.
• Single Power Supply Operation. +5 to +12
Volts D.C.
• ± 2 Ampere Drive Capability
• Independent Cool and Heat Current Limit
Adjustments
• Temperature Stability Better Than 0.01°C
• Small Size Hybrid Circuit Construction
Pin Configuration
An evaluation kit is available that contains the DN1220,
a fan cooled TEC, and an aluminum cold plate (with
imbedded thermistor) that is attached to the TEC. The
evaluation kit operates on a 12 VDC power supply.
Temperature of the cold plate can be changed from 0 to
60 °C with a variable resistor. The TEC is mounted on a
socket so that it can be easily removed.
INT OUT 7
RTC 6
IN MONITOR 5
RG 4
VR 3
INPUT 2
SIG GND 1
ThermOptics
DN1220
TEC
CONTROLLER
XXXX
8 RCL1
9 VR/2
10 RCL2
11 PWR GND
12 VS
13 TEC +
14 TEC -
Functional Block Diagram of
the DN1220 TEC Controller
INT OUT
RTC
7
6 100 KΩ
IN MONITOR
RG
5
4 5 KΩ
VR 3 VR
INPUT
2 +1
www.DataSheet4U.com
SIG GND
1
1 µF
VR
2
∑
VR
1 MΩ
VOLTAGE TO
CURRENT
POWER STAGE
IN VOLTAGE OUT
LIMITER
8
VR 9
2
10
VR
2 11
12
- 1 13
14
RCL1
VR
2
RCL 2
PWR GND
VS
TEC +
TEC -
Figure 1
™
Page 1
1 page  
DN1220
Setting Up The DN1220 TEC Controller
The maximum output current of the DN1220 is limited to 2 amperes by design. However, there are operating
conditions that will limit the maximum current to less than 2 amperes. The compliance voltage of the
DN1220, which is dependent on the power supply voltage, limits the maximum voltage that can be supplied to the
TEC. In addition, the resistance of the TEC can restrict the maximum current available. The current limiting
characteristics of the DN1220, as a function of supply voltage and TEC resistance, are shown in Figure 4.
Examples: The compliance voltage of the DN1220 is typically ±8 volts for a supply voltage of 12 volts. This is the
maximum voltage available to drive the TEC. If the TEC resistance is 5 ohms, the maximum TEC current will only be
1.6 amperes. Likewise, the compliance voltage is ±2 volts when the supply voltage is 5 volts and the TEC 's
resistance is 2 ohms. Therefore, the maximum current will be limited to 1 ampere in this case.
Maximum Output Voltage vs. TEC Resistance
(Typical Data)
12
11
10
9
8
7 2 Ampere
6 Current Limit
5
VS = 12V
VS = 9V
4
3 VS = 5V
2
1
0
0123456
TEC Resistance (Ω)
Figure 4
Mechanical Dimensions
1.000"
PIN 1
DN1220
0.012
ThermOptics
DN1220
TEC
CONTROLLER
XXXX
0.800 1.200
DN1220
Interconnect Board
1.200
PIN 1
PIN 14
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0.700"
1.000"
0.100
0.063
0.200
MAX
Figure 5
Page 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet DN1220.PDF ] | |
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