MIC2341 Datasheet, PDF (22/32 Pages) Micrel Semiconductor – Dual-Slot PCI Express Hot-Plug Controller

Micrel, Inc.
MIC2341/2341R
Figure 6. MIC2341R Auto-Retry Timing Diagram and Operation
In very cost-sensitive applications, the system design
engineer can save the cost of the (2) external
CFILTER[A/B] capacitors by using only the digital filter
and/or the auto-retry delay counters. This mode is
automatically invoked by connecting the MIC2341 or the
MIC2341R’s CFILTER[A/B] pins directly to AGND. In this
configuration, the primary OC detectors’ response time
t_FLT is equal to t_DFLT (or 40ms as above) In Figure 7,
the gate drive circuits have taken control and regulate
the inrush current to charge the load capacitances in
current limit. Once the internal digital filter delay counter
terminates, the circuit breaker trips off. As in the
previous case, the MIC2341 latches off and the
MIC2341R initiates the auto-retry delay counter to count
up to 820ms before attempting another power-up cycle.
October 2007
22
M9999-102507-A
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