MAX1978EVKIT【PDF 15/20 页】EVAL KIT MAX1978

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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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