參數(shù)資料
型號： LTC1923
廠商： Linear Technology Corporation
英文描述： High Efficiency Thermoelectric Cooler Controller
中文描述： 高效熱電制冷控制器
文件頁數(shù)： 13/28頁
文件大?。?/td> 452K
代理商： LTC1923
13
LTC1923
1923f
Transistor M1 is off and the current limit threshold is given
by:
R
V
R
R
ILIM
ILIM
+
(
1
2
When TEC
–
is greater than TEC
+
, the open-drain output,
H/C, pulls high through R
PULLUP
, causing M1 to turn on.
The current limit value is given by:
(
+
(
I
R
LIMIT
ILIM
REF
S
=
)
0 15
.
1
I
R
R
V
)
R
R
R
R
LIMIT
ILIM
ILIM
REF
ILIM
ILIM
ILIM
S
=
)
0.
1
3
2
1
3
reducing the current limit threshold for heating. If the
heating current limit needs to be greater than the cooling
limit, an extra inversion can be added.
Open/Shorted Thermistor Detection
The temperature sense element (NTC thermistor, plati-
num RTD or other appropriate component) must be prop-
erly connected in order for the system to regulate
temperature. If the sense element is incorrectly con-
nected, the system will be unable to control the tempera-
ture and the potential exists for the system to thermally run
away.
A TEC by nature produces a temperature differential be-
tween opposite sides of the device depending upon how
much current is flowing through it. There is a maximum
limit to the amount of temperature differential that can be
produced, which depends upon a number of physical
OPERATIOU
parameters including the size of the TEC and how well
heatsinked the device is. The TEC itself dissipates power
to produce the temperature differential, generating heat,
which must also be removed. At a certain level of power
dissipation in the TEC, both sides will begin to heat. This
is because the TEC will not be able to pump the self-
generated heat to the outside world, which can lead to
thermal runaway. If the device thermally runs away, dam-
age to the TEC and possibly the components whose
temperature is being regulated will occur.
The LTC1923 contains two dedicated comparators that
directly monitor the voltage on the thermistor. If this
voltage is outside the valid window, a latch is set and the
FAULT pin is asserted low. The output drivers are
not
shut
off and the control circuitry is not disabled, meaning the
part
will continue
to try to regulate temperature. It is up to
the user to use the FAULT signal to disable the appropriate
circuitry. There are a couple of ways to do this. The first
way is to have the FAULT signal a system microprocessor
to shut the system down through the SDSYNC pin. Fig-
ure5 shows another means of protecting the system.
External NMOS M1 and PMOS M2 have been added along
with two pull-up resistors (RP1 and RP2). M1 and RP2
invert the FAULT signal while M2 acts as a switch in series
with bridge. When no fault is present, the gate of M1 is
–
+
H/C
M1
2N7002
LTC1923
I
LIM
TEC
+
TEC
–
1923 F04
R
LIM3
R
ILIM1
R
ILIM2
V
REF
V
DD
R
PULLUP
Figure 4. Independently Heating/Cooling Current Limit
4
3
2
1
1923 F05
NDRVB
NDRVA
CS
+
R
S
CS
–
PDRVA
PDRVB
FAULT
M1
M2
R
P2
TEC
V
DD
V
DD
V
DD
R
P1
Figure 5. Redundant Fault Protection
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LTC1923EGN High Efficiency Thermoelectric Cooler Controller
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相關代理商/技術參數(shù)
參數(shù)描述
LTC1923EGN 功能描述:IC CONTROLLER TEC HI EFF 28SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
LTC1923EGN#PBF 功能描述:IC CONTROLLER TEC HI EFF 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
LTC1923EGN#TR 功能描述:IC CONTROLLER TEC HI EFF 28SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
LTC1923EGN#TRPBF 功能描述:IC CONTROLLER TEC HI EFF 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
LTC1923EGNPBF 制造商:Linear Technology 功能描述:Thermoelectric Cooler Controller SSOP28
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