hip1011a Intersil Corporation, hip1011a Datasheet - Page 8

• Manufacturer Part Number: hip1011a
• Description: Pci Hot Plug Controller
• Manufacturer: Intersil Corporation

HIP1011A PCI Hot Plug Controller
Key Feature Description and Operation
A drop-in alternative to the widely used HIP1011, the
HIP1011A additionally features an adjustable delay time to
fault reporting and latch-off of the MOSFET switches. During
an over current condition (OC) on any output, or an under
voltage (UV) condition on the +5V, +3.3V or +12V outputs, a
LOW (0V) is presented on the FLTN output and all
MOSFETs are latched-off. A programmable delay time from
an OC or UV event to the FLTN signal going LOW and
MOSFET latch-off can be designed into the system by a
single capacitor from the FLTN pin to ground. The addition of
an increasingly larger capacitor value on the FLTN pin
increases the time from the OC or UV occurrence to the start
of the FLTN high to low transition. The capacitor also slows
the falling ramp thus delaying reaching the FLTN latch
threshold of ~2.4V. Once the FLTN latch voltage threshold is
reached the HIP1011A then simultaneously shuts down all
four supplies. This added feature enables the HIP1011A to
ignore both transient UV and OC events to the extent of a
single capacitor value in the system design. This feature also
may allow the system OS to complete housekeeping
activities in preparation for a possible unplanned shutdown
of the affected card by receiving an early warning signal from
the HIP1011A.
Customizing and Optimizing Circuit Performance
and Functionality
HOW ADJUSTABLE IS THE FAULT REPORTING DELAY
AND TIME TO POWER SUPPLY LATCH-OFF?
Figure 12 illustrates the relationship between the FLTN
signal and the gate drive outputs. Duration
time between FLTN starting to transition from High to Low,
NOTE:
3. All capacitors are ±r10%.
POWER CONTROL INPUT
3.3V INPUT
-12V INPUT
12V INPUT
8
5m: 1%
6.04k:
FAULT OUTPUT (ACTIVE LOW)
FIGURE 11. HIP1011A TYPICAL APPLICATION
a
1%
, indicates the
7.6A OUT
3.3V
0.5A OUT
M12VIN
FLTN
3V5VG
V
12VIN
3VISEN
3VS
OCSET
HIP1011A
12V
(SEE TABLE 1)
CC
HIP1011A
PWRON
5VISEN
M12VO
M12VG
12VG
12VO
GND
5VS
0.1A OUT
(indicating a fault has occurred) and the start of the gate
drive outputs latching off. The latch-off is initiated by the
falling FLTN signal reaching the output latch threshold
voltage, V
capacitor on the response time.
CAN THE HIP1011A BE USED ON A CompactPCI
BOARD?
Yes, the HIP1011A can be used on a CompactPCI card
application. See Technical Brief TB358.
3V5VG Response
-12V
0.033PF
0.033PF
FLTN, TH
5A OUT
5V
TABLE 1. RESPONSE TIME TABLE
FIGURE 12. TIMING DIAGRAM
5m: 1%
a
. Table 1 illustrates the effect of the FLTN
T1
0.033PF
a
0.001PF
5V INPUT
0.85Ps
T2
V
FLTN, TH
0.1PF
37Ps
3V5VG
November 16, 2004
FLTN
3.8ms
10PF
FN4631.5