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参数资料
| 型号： | MAX1979ETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR INT TEMP 48TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 热电冷却器 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（7x7） |
| 包装： | 带卷 (TR) |
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
22μF to 100μF ceramic capacitor between the V DD
REF
69.8k ?
power plane and power ground. Insufficient supply
bypassing can result in supply bounce and degraded
accuracy.
AIN+
AOUT
1%
105k ?
1%
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
80.6k ?
1%
1 μ F
output filter:
C COMP ≥ ? m ? × ?
? f BW ? ? 2 π × ( R SENSE + R TEC ) ?
MAX1978
AIN-
20k ?
1%
REF
where:
? g ? ? 24 × R SENSE ?
?
MAX1979
BFB-
10k ?
f BW = unity-gain bandwidth frequency
g m = loop transconductance, typically 100μA/V
x50
FB-
FB+
V SETPOINT
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
Figure 3. Thermistor Voltage Monitor
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.
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:
?
f LC =
1
2 π LC
V MAXIP = 10 (I TECP(MAX) R SENSE )
V MAXIN = 10 (I TECN(MAX) R SENSE )
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
Maxim Integrated
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.
15
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| MAX197ACAI+ | 功能描述:模数转换器 - ADC 12-Bit 8Ch 100ksps 4.18V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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| MAX197ACAI-T | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX197ACNI | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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