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参数资料
| 型号： | MAX1978ETM |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | Integrated Temperature Controllers for Peltier Modules |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 1Cel, SQUARE, SURFACE MOUNT |
| 封装： | EXPOSED PAD, TQFP-48 |
| 文件页数： | 15/20页 |
| 文件大小： | 620K |
| 代理商： | MAX1978ETM |
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
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| MAX197AEAI | Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface |
| MAX197BCAI | Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1978ETM+ | 功能描述:电压模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1978ETM+T | 功能描述:电压模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1978ETM-T | 功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1978EVKIT | 功能描述:电源管理IC开发工具 MAX1978 EVAL KIT RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX19790ETX/GH9 | 功能描述:有源衰减器 RoHS:否 制造商:TriQuint Semiconductor 通道数量: 最大频率: 阻抗: 最大 VSWR: 位数: 最大工作温度: 最小工作温度: |
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