ADN8834ACPZ-R2 datasheet(17/27 Pages) AD

tên linh kiện	ADN8834ACPZ-R2

Giải thích chi tiết về linh kiện	Ultracompact, 1.5 A Thermoelectric Cooler (TEC) Controller

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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.

COOLING

ILIM

COOLING

MAX

TEC

−

where RCS = 0.525 V/A.

HEATING

ILIM

HEATING

MAX

TEC

−

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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