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參數(shù)資料
| 型號(hào)： | LXE1810EVALKIT |
| 英文描述： | Thermo Electric Controller IC |
| 中文描述： | 熱電控制器IC |
| 文件頁數(shù)： | 2/3頁 |
| 文件大?。?/td> | 99K |
| 代理商： | LXE1810EVALKIT |
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright
2000
Rev. 0.4, 2002-10-31
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LXE1810-100
Thermo Electric Cooler Drive
L I N F I N I T Y D I V I S I O N
A P P L I C A T I O N N O T E
The LX1810 has an internal 5V reference at PIN 1. This
reference is used with the POT adjustment that is the
temperature setting and with the thermister resister divider
that is the temperature feedback. The value of R43 is set
equal to the value of the thermister at the temperature of
operation, (±20%).
The values for R42, R41, R40, C8, & C2 are used to set
the loop compensation for stable closed loop operation.
This Eval board has been compensated for a Marlow
Industries Inc. MI1012T-01, TEC device.
The value of R39 sets the peak output voltage limit of
the power amplifier. The pot allows the user to adjust the
output voltage for the TEC device resistance which sets the
maximum output current. The LX1810 has an internal
cycle by cycle current limit that is activated after a count of
9 cycles of over current. When activated the LX1810 goes
into a hiccup mode until it has 2 cycles of normal current.
This mode will prevent damage when the output has a short
circuit.
The inductors, L1 and L2 are designed for the continuous
current rating required by the device being driven by the
power amplifier. At the 300kHz switching frequency an
inductance value between 5μH and 10μH should be used.
C22 and C23 provide an LC low pass filter. The TEC
devices have a slow rate of change of temperature with time,
which means the loop bandwidth will probably be under
10Hz. This means that the LC filters can be set in the range
of 500Hz. Therefore, you can use the largest cap value with
the voltage and package size required by your design.
The LX1810 has its FET drivers buffered so that the Eval
board is capable of driving the highest power TO-220
package MOSFETs. An example of these devices are the
Fairchild NDP6030PL P-Channel MOSFET, capable of 20
amps and the SUP70N03-09BP N-Channel MOSFET,
capable of 20 amps.
With these devices and the proper
inductors, and the correct amount of heat sink, the power
amplifier is capable of 10 amps continuous at an output
voltage of 10 volts. So, any output power design is feasible
up to this maximum design with the proper selection of
components.
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