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SA305 Datasheet(PDF) 8 Page - Cirrus Logic |
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SA305 Datasheet(HTML) 8 Page - Cirrus Logic |
8 / 8 page APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 8 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 J = 135°C. 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 J = 160°C. Once 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 IDEAL) using 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 ACTUAL) as shown below: |
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