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參數資料
| 型號： | LTC1923EUH |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Thermoelectric Cooler Controller |
| 中文描述： | SWITCHING CONTROLLER, 270 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, PLASTIC, QFN-32 |
| 文件頁數： | 14/28頁 |
| 文件大?。?/td> | 452K |
| 代理商： | LTC1923EUH |
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14
LTC1923
1923f
pulled to V
DD
forcing the gate of M2 low, which allows the
bridge to operate as described earlier. When a fault occurs
and FAULT is asserted low, M1 is shut off, forcing the gate
of M2 high, shutting that device off. The power path is thus
opened, ensuring no current is delivered to the TEC. M2
wants to have low R
DS(ON)
(less than the value of R
S
to
minimize the power losses associated with it). R
P1
and
R
P2
can be selected on the order of 100k.
The lower comparator threshold level is 20% (twenty
percent) of V
SET
and the upper comparator threshold level
is 350mV below V
SET
, where V
SET
is the voltage applied on
the V
SET
pin. V
SET
is typically tied to the bias source for the
thermistor divider so that any variations will track out.
The V
SET
pin has a high input impedance so that a divided-
down voltage can be supplied to this pin to modify the
acceptable thermistor impedance range. This is shown in
Figure 6. The voltage applied to the V
SET
pin must be a
minimum of 2V. The lower thermistor impedance thresh-
old is:
R
R
R
R
2 0.
The upper impedance threshold is:
+
2
α
R
TH LOWER
(
)
0.
=
1
3
3
R
R1 3
R
R
2
R
3
R
(
R
TH UPPER
(
)
– (
)
)
=
+
)
+
2
3
where
α
= 0.35/V
SET
.
Changing R1 also changes the valid thermistor impedance
range.
Example: V
REF
= V
SET
= 2.5V
R1 = 10k, R2 = 0
, R3 = open
R
TH
= 10k NTC thermistor with a temperature coeffi-
cient of –4.4%/C at 25
°
C.
The acceptable thermistor impedance range before caus-
ing a fault is 2.5k
to 61k
. This corresponds to a valid
temperature range of between about –10
°
C and 60
°
C.
To ensure the part does not power up with a latched fault
at start-up, a fault will not be latched until soft-start has
completed. This corresponds to the voltage on SS reach-
ing 1.5V. For a 1
μ
F soft-start capacitor, this delay is
approximately 1 second. This provides enough time for all
supplies (V
DD
, setpoint reference and V
REF
) to settle at
their final values.
TEC Voltage Clamping
An internal clamp circuit is included to protect the TEC
from an overvoltage condition. When the differential volt-
age across the TEC exceeds 2.5V, the error amplifier
output voltage at the input of the PWM comparator is
limited. This clamps the duty cycle of the output drivers,
and therefore, the voltage across the TEC. The voltage
where clamping occurs can be increased by placing a
resistor divider in parallel with the TEC and by making the
appropriate connections to TEC
+
and TEC
–
as shown in
Figure 7. The divider increases the voltage across the TEC,
V
TECOOLER
, where the clamp activates, to:
V
R
R
R
100
k
V
R
200
k
R
200
k
TECOOLER
TE
TE
TE
CM
TE
TE
=
+
+
+
1
2 5
. –
1
1
2
1
1
1
V
REF
V
SET
V
THRM
1923 F06
R2
R1
R
TH
10k
NTC
R3
Figure 6. Modifying the Acceptable Thermistor Range
TEC
TEC
+
R
TE2
R
TE1
1923 F07
V
TECOOLER
+
V
CM
–
TEC
–
Figure 7. Increasing Voltage Clamp Threshold
OPERATIOU
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC1923EUH#PBF | 功能描述:IC THERMOELEC COOLER CNTRLR32QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 應用:熱電冷卻器 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:28-SOIC（0.173"，4.40mm 寬）裸露焊盤 供應商設備封裝:28-TSSOP 裸露焊盤 包裝:管件 產品目錄頁面:1410 (CN2011-ZH PDF) |
| LTC1923EUH#TR | 功能描述:IC THERMOELEC COLLER CNTRLR32QFN 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 |
| LTC1923EUH#TRPBF | 功能描述:IC THERMOELEC COOLER CNTRLR32QFN 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 |
| LTC1928ES6-5#PBF | 制造商:Linear Technology 功能描述:Charge Pump STPUP 5V 30mA 6-Pin TSOT-23 |
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