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Data Sheet
APPLICATIONS INFORMATION
ADN8831
THERMISTOR INPUT
PID COMPENSATOR
MOSFET DRIVER
AMPLIFIER
A V = R FB /(R TH + R X ) – R FB /R
AMPLIFIER
A V = Z 2 /Z 1
A V = 5
SFB
SPGATE
PWM
SNGATE
LPF
IN1P
IN1N
Chop1
OUT1
IN2P
IN2N
Chop2
OUT2
CONTROL
LPGATE
TEC
LINEAR
LNGATE
LFB
V REF
2
3
4
5
6
7
17.68k?
R
V REF /2
V TEMPSET
7.68k?
R X
R FB
Z 1
Z 2
V OUT1
V OUT2
R TH
(10k? @ 25°C)
Figure 17. Signal Flow Block Diagram
? ? ? 1 1 ? ? ? ?
R TH = R R exp ? B ? ?
?? ? T T R ? ? ??
SIGNAL FLOW
The ADN8831 integrates two auto-zero amplifiers defined
as the Chop1 amplifier and the Chop2 amplifier. Both of the
amplifiers can be used as standalone amplifiers, therefore, the
implementation of temperature control can vary. Figure 17
shows the signal flow through the ADN8831 , and a typical
implementation of the temperature control loop using the Chop1
amplifier and the Chop2 amplifier.
In Figure 17, the Chop1 amplifier and the Chop2 amplifier are
T LOW and T HIGH are the endpoints of the temperature range and
T MID is the average. In some cases, with only B constant available ,
R TH is calculated using the following equation:
? ?
where:
R TH is a resistance at T [K].
R R is a resistance at T R [K].
R X = ? ? LOW MID
?
?
configured as the thermistor input amplifier and the PID
compensation amplifier, respectively. The thermistor input
amplifier gains the thermistor voltage then outputs to the PID
compensation amplifier. The PID compensation amplifier then
R X is calculated using the following equation:
? R   R + R MID R HIGH ? 2 R LOW R HIGH
? R LOW + R HIGH ? 2 R MID
?
?
R FB
R FB
V OUT1 = ? ?
? + 1 ? ? × REF
compensates a loop response over the frequency domain.
The output from the compensation loop at OUT2 is fed to the
linear MOSFET gate driver. The voltage at LFB is fed with OUT2
into the PWM MOSFET gate driver. Including the external
transistors, the gain of the differential output section is fixed at 5.
For details on the output drivers, see the MOSFET Driver
Amplifier section.
THERMISTOR SETUP
The thermistor has a nonlinear relationship to temperature; near
optimal linearity over a specified temperature range can be
achieved with the proper value of R X placed in series with the
thermistor. First, the resistance of the thermistor must be
known, where
R LOW = R TH @ T LOW
R MID = R TH @ T MID
R HIGH = R TH @ T HIGH
THERMISTOR AMPLIFIER (Chop1)
The Chop1 amplifier can be used as a thermistor input amplifier.
In Figure 17, the output voltage is a function of the thermistor
temperature. The voltage at OUT1 is expressed as
? ? V
? R TH + R X R ? 2
where:
R TH is a thermistor.
R X is a compensation resistor.
R is calculated using the following equation:
R = R X + R TH @ 25 ° C
V OUT1 is centered around V REF /2 at 25°C. With the typical
values shown in Figure 17, an average temperature-to-voltage
coefficient is ?25 mV/°C at a range of +5°C to +45°C.
Rev. A | Page 15 of 20
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