ADN8834ACPZ-R2 datasheet(17/27 Pages) AD

Nome de Peças	ADN8834ACPZ-R2

Descrição Electrónicos	Ultracompact, 1.5 A Thermoelectric Cooler (TEC) Controller

PDF	27 Pages

Scroll/Zoom	100%

Fabricante Electrônico	AD [Analog Devices]

Página de início	http://www.analog.com

Logo

17 / 27 page

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

ADN8834ACPZ-R2 Folha de dados(PDF) 17 Page - Analog Devices

ADN8834ACPZ-R2 Folha de dados(HTML) 17 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Folha de dados Download

Ligação URL