ES1010SI Datasheet, PDF (6/11 Pages) Altera Corporation – 12V Hot-Swap Power Distribution Controllers

Page 6
During the soft-start and the time-out delay duration with the IC in its current limit mode, the V_GS of the external N-Channel
MOSFET is reduced driving the MOSFET switch into a (linear region) high r_DS(ON) state. Strike a balance between the CR limit and
the timing requirements to avoid periods when the external N-Channel MOSFETs may be damaged or destroyed due to excessive
internal power dissipation. Refer to the MOSFET SOA information in the manufacturer’s data sheet.
When driving particularly large capacitive loads a longer soft-start time to prevent current regulation upon charging and a short CR
time may offer the best application solution relative to reliability and FET MTF.
Physical layout of R_SENSE resistor is critical to avoid the possibility of false overcurrent occurrences. Ideally, trace routing
between the R_SENSE resistors and the IC is as direct and as short as possible with zero current in the sense lines (see Figure 1).
CORRECT
INCORRECT
TO ISEN+ AND
R_ISET
CURRENT
SENSE RESISTOR
FIGURE 1. SENSE RESISTOR PCB LAYOUT
.
ES1010SI 12V Hot-Swap Power Distribution Controllers
09617
March 14, 2014
March 2014 Altera Corporation
Rev A