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ADN8834ACPZ-R2 数据表(PDF) 17 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) 17 Page - Analog Devices

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Data Sheet
ADN8834
Rev. B | Page 17 of 27
MAXIMUM TEC CURRENT LIMIT
To protect the TEC, separate maximum TEC current limits in
cooling and heating directions are set by applying a voltage
combination at the ILIM pin.
Using a Resistor Divider to Set the TEC Current Limit
The internal current sink circuitry connected to ILIM draws a
40 µA current when the ADN8834 drives the TEC in a cooling
direction, which allows a high cooling current. Use the following
equations to calculate the maximum TEC currents:
VILIM_HEATING = VREF × RC2/(RC1 +RC2)
where VREF = 2.5 V.
VILIM_COOLING= VILIM_HEATING + ISINK_ILIM × RC1||RC2
where ISINK_ILIM = 40 µA.
CS
COOLING
ILIM
COOLING
MAX
TEC
R
V
I
V
25
.
1
_
_
_
−
=
where RCS = 0.525 V/A.
CS
HEATING
ILIM
HEATING
MAX
TEC
R
V
I
_
_
_
V
25
.
1
−
=
VILIM_HEATING must not exceed 1.2 V and VILIM_COOLING must be
more than 1.3 V to leave proper margins between the heating
and the cooling modes.
VDD
40µA
ILIM
COOLING
ITEC
+
–
TEC
CURRENT
LIMIT
VREF
RC1
RC2
SW OPEN = VILIMH
SW CLOSED = VILIMC
Figure 32. Using a Resistor Divider to Set the TEC Current Limit



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