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ADN8834ACPZ-R2 数据表(PDF) 18 Page - Analog Devices

部件名 ADN8834ACPZ-R2
功能描述  Ultracompact, 1.5 A Thermoelectric Cooler (TEC) Controller
PDF  27 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADN8834ACPZ-R2 数据表(HTML) 18 Page - Analog Devices

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ADN8834
Data Sheet
Rev. B | Page 18 of 27
APPLICATIONS INFORMATION
LINEAR
AMPLIFIER
LDR
TEC CURRENT SENSE
SW
PGNDS
PVIN
PWM POWER
STAGE
PWM
MOSFET
DRIVER
CONTROL
SFB
PWM
MODULATOR
PGNDS
LDR
TEC
PGNDL
PVIN
PGNDL
+
–
OSCILLATOR
IN2P
OUT2
IN2N
TEC DRIVER
LINEAR POWER
STAGE
+
–
+
–
IN1P
OUT1
IN1N
Z2
Z1
RFB
R
RX
RTH
VREF/2
VREF
VTEMPSET
VOUT2
VOUT1
VIN
VIN
TEMPERATURE ERROR
AMPLIFIER
AV = RFB/(RTH + RX) – RFB/R
CHOPPER 1
PID COMPENSATION
AMPLIFIER
AV = Z2/Z1
CHOPPER 2
Figure 33. Signal Flow Block Diagram
SIGNAL FLOW
The ADN8834 integrates two auto-zero amplifiers, defined as
the Chopper 1 amplifier and the Chopper 2 amplifier. Both of the
amplifiers can be used as standalone amplifiers; therefore, the
implementation of temperature control can vary. Figure 33
shows the signal flow through the ADN8834, and a typical
implementation of the temperature control loop using the
Chopper 1 amplifier and the Chopper 2 amplifier.
In Figure 33, the Chopper 1 and Chopper 2 amplifiers are config-
ured 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 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 LDR is fed with OUT2 into
the PWM MOSFET gate driver. Including the internal 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 RX placed in series with the thermistor.
First, the resistance of the thermistor must be known, where
•
RLOW = RTH at TLOW
•
RMID = RTH at TMID
•
RHIGH = RTH at THIGH
TLOW and THIGH are the endpoints of the temperature range and
TMID is the average. In some cases, with only the β constant
available, calculate RTH using the following equation:




−
=
R
R
TH
T
T
R
R
1
1
exp β
where:
RTH is a resistance at T (K).
RR is a resistance at TR (K).



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