參數(shù)資料
型號： MAX1978
廠商： Maxim Integrated Products, Inc.
英文描述： Integrated Temperature Controllers for Peltier Modules
中文描述： Peltier模塊集成溫度控制器
文件頁數(shù)： 15/20頁
文件大?。?/td> 620K
代理商： MAX1978
Design Procedure
Inductor Selection
Small surface-mount inductors are ideal for use with the
MAX1978/MAX1979. Select the output inductors so that
the LC resonant frequency of the inductance and the
output capacitance is less than 1/5 the selected switch-
ing frequency. For example, 3.0μH and 1μF have a res-
onance at 92kHz, which is adequate for 500kHz
operation.
where:
f
LC
= resonant frequency of output filter.
Capacitor Selection
Filter Capacitors
Decouple each power-supply input (V
DD
, PV
DD
1, and
PV
DD
2) with a 10μF ceramic capacitor close to the sup-
ply pins. If long supply lines separate the source sup-
ply from the MAX1978/MAX1979, or if the source
supply has high output impedance, place an additional
22μF to 100μF ceramic capacitor between the V
DD
power plane and power ground. Insufficient supply
bypassing can result in supply bounce and degraded
accuracy.
Compensation Capacitor
Include a compensation capacitor to ensure current-
power control-loop stability. Select the capacitor so that
the unity-gain bandwidth of the current-control loop is
less than or equal to 10% the resonant frequency of the
output filter:
where:
f
BW
= unity-gain bandwidth frequency
g
m
= loop transconductance, typically 100μA/V
C
COMP
= value of the compensation capacitor
R
TEC
= TEC series resistance
R
SENSE
= sense resistor
Setting Voltage and Current Limits
Consider TEC parameters to guarantee a robust
design. These parameters include maximum positive
current, maximum negative current, and the maximum
voltage allowed across the TEC. These limits should be
used to set MAXIP, MAXIN, and MAXV voltages.
Setting Max Positive and Negative TEC Current
MAXIP and MAXIN set the maximum positive and nega-
tive TEC currents, respectively. The default current limit
is ±150mV / R
SENSE
when MAXIP and MAXIN are con-
nected to REF. To set maximum limits other than the
defaults, connect a resistor-divider from REF to GND to
set V
MAXI_
. Use resistors in the 10k
to 100k
range.
V
MAXI_
is related to ITEC by the following equations:
V
MAXIP
= 10 (I
TECP(MAX)
R
SENSE
)
V
MAXIN
= 10 (I
TECN(MAX)
R
SENSE
)
where I
TECP(MAX)
is the maximum positive TEC current
and I
TECN(MAX)
is the maximum negative TEC current.
Positive TEC current occurs when CS is less than OS1:
I
TEC
R
SENSE
= CS - OS1 when I
TEC
< 0.
I
TEC
R
SENSE
= OS1 - CS when I
TEC
> 0.
C
g
f
BW
R
R
R
COMP
m
SENSE
+
SENSE
TEC
≥
×
×
×
24
2
π
(
)
f
LC
LC
=
1
2
π
M
Integrated Temperature
Controllers for Peltier Modules
______________________________________________________________________________________
15
MAX1978
MAX1979
x50
FB+
FB-
BFB-
AOUT
AIN+
AIN-
10k
1
μ
F
20k
1%
80.6k
1%
69.8k
1%
105k
1%
REF
REF
V
SETPOINT
Figure 3. Thermistor Voltage Monitor
相關(guān)PDF資料
PDF描述
MAX1978-MAX1979 Integrated Temperature Controllers for Peltier Modules
MAX1978ETM Integrated Temperature Controllers for Peltier Modules
MAX1979ETM Integrated Temperature Controllers for Peltier Modules
MAX197ACWI Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface
MAX197AMYI Circular Connector; No. of Contacts:18; Series:MS27505; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Box Mount Receptacle RoHS Compliant: No
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1978ETM 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX1978ETM+ 功能描述:電壓模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX1978ETM+T 功能描述:電壓模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX1978ETM-T 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX1978EVKIT 功能描述:電源管理IC開發(fā)工具 MAX1978 EVAL KIT RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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