ADN8831

Data Sheet

Rev. A | Page 14 of 20

The sink current is set by the resistor connected from FREQ

(Pin 13) to ground. The sink current is calculated using the

following equation:

FREQ

SINK

R

I

V

25

.

1

=

where:

The cooling and heating limits are calculated using the

following equations:

B

A

B

REF

COOL

VLIM

R

R

R

V

V

+

×

=

,

B

A

SINK

COOL

VLIM

HEAT

VLIM

R

R

I

V

V

×

−

=

,

,

MAXIMUM TEC CURRENT LIMIT

To protect the TEC, separate maximum TEC current limits in

cooling and heating directions are set by applying a voltage at

ILIMC (Pin 1) and ILIMH (Pin 32). Maximum TEC currents

are calculated using the following equations:

SENSE

ILIMC

COOL

MAX

TEC

R

V

I

×

−

=

25

V

25

.

1

,

,

SENSE

ILIMH

HEAT

MAX

TEC

R

V

I

×

−

=

25

V

25

.

1

,

,