APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739

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This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.

SA305U REV D AUGUST 2007 © 2007 Apex Microtechnology Corp.

OPERATING

CONSIDERATIONS

SA305

The warning temperature setting is fixed at T

When the junction temperature gets to the programmed point,

the temperature warning bit will be set. It will be reset when

the temperature falls below 85°C.

The Fault temperature setting is fixed at T

the Fault temperature has been reached the Fault Output goes

high and the outputs of the device are latched off. This output

can be used as a microcontroller interrupt. The latch will not

be reset until the temperature is below 110°C.

If more than one output is required to be conducting large

currents at the same time, the maximum current will need to

be de-rated.

CURRENT SENSE LINEARITY CALCULATION

The current sense linearity is calculated using the method

described below:

a) Define straight line (y = mx + c) joining the two end data

points where, m is the slope and c is the offset or zero

crossover. Calculate the slope m and offset c using the

extreme data points. Assume Isense in the y axis and Iload

in the x axis.

b) Calculate linear Isense (or ideal Isense value, IS

the straight line equation derived in step (a) for the Iload

data points.

c) Determine deviation from linear Isense (step (b)) and actual

measured Isense value (IS