7
LTC1645
1645fa
Hot Circuit Insertion
When a circuit board is inserted into a live backplane, the
supply bypass capacitors on the board can draw huge
transient currents from the backplane power bus as they
charge. These transient currents can cause permanent
damage to the connector pins and produce glitches on the
system supply, resetting other boards in the system.
The LTC1645 is designed to turn a boards supply voltages
on and off in a controlled manner, allowing the board to be
safely inserted or removed from a live backplane. The chip
provides a system reset signal and a spare comparator to
indicate when board supply voltages drop below user-
programmable voltages, and a fault signal to indicate if an
overcurrent condition has occurred.
The LTC1645 can be located before or after the connector
as shown in Figure 1. A staggered PCB connector can
sequence pin connections when plugging and unplugging
circuit boards. Alternatively, the control signal can be
generated by processor control.
Power Supply Tracking and Sequencing
Some applications require that the potential difference
between two power supplies not exceed a certain voltage.
This requirement applies during power-up and power-
down as well as during steady state operation, often to
prevent latch-up in a dual supply ASIC. Other systems
require one supply to come up after another, for example,
if a system clock needs to start before a block of logic.
Typical dual supplies or backplane connections may come
up at arbitrary rates depending on load current, capacitor
size, soft-start rates, etc. Traditional solutions are cum-
bersome and require complex circuitry to meet the power
supply requirements.
The LTC1645 provides a simple solution to power supply
tracking and sequencing needs. The LTC1645 guarantees
supply tracking by ramping the supplies up and down
together (see Figure 15). The sequencing capabilities of
the LTC1645 allow nearly any combination of supply
ramping (e.g., see Figure 17) to satisfy various sequenc-
ing specifications. See the Power Supply Tracking and
Sequencing Applications section for more information.
APPLICATIO S I FOR ATIO
U
U
U
SENSE
FAULT
V
CC
V
OUT
FAULT
ON
ON
GND
GATE
LTC1645
BACKPLANE
CONNECTOR
STAGGERED PCB
EDGE CONNECTOR
C
LOAD
+
V
CC
(a) Hot Swap Controller on Motherboard
SENSE
FAULT
V
CC
V
OUT
FAULT
ON
GND
GATE
LTC1645
1645 F01
C
LOAD
+
V
CC
BACKPLANE
CONNECTOR
STAGGERED PCB
EDGE CONNECTOR
(b) Hot Swap Controller on Daughterboard
Figure 1. Staggered Pins Connection
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相关PDF资料
LTC1646IGN#TR
IC CNTRLR HOTSWAP PCIDUAL 16SSOP
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LTC1967IMS8#TRPBF
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LTC1968IMS8#TRPBF
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相关代理商/技术参数
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