參數(shù)資料
型號(hào)： SMH4804
廠(chǎng)商： Summit Microelectronics, Inc.
英文描述： -48V Programmable Hot Swap Sequencing Power Controller
中文描述： - 48V的可編程序熱插拔電源控制器
文件頁(yè)數(shù)： 6/41頁(yè)
文件大小： 574K
代理商： SMH4804
Functional Description
SMH4804
6
2050 3.7 10/30/02
Summit Microelectronics
Circuit Breaker Operation
The SMH4804 provides a number of circuit breaker
functions to protect against over-current conditions. A
sustained over-current event could damage the host supply
and/or the load circuitry. The board’s load current passes
through a series resistor (R
S
) connected between the
MOSFET source (which is tied to CBSENSE) and V
SS
. The
breaker trips whenever the voltage drop across R
S
is
greater than 50mV for more than t
CBD
(a programmable
filter delay ranging from 10μs to 500μs).
The circuit breaker cycle time is controlled via bit 0 of
Register 4.
Figure 5 shows the circuit breaker duty cycle operation with
RESET# high.
Figure 5. Circuit Breaker Duty Cycle Operation with
RESET# High
Figure 6 shows the behavior of VGATE and CBSENSE
immediately after RESET# is deasserted.
The circuit breaker cycle time can be programmed to a
value of either 2.5 seconds of 5 seconds depending on the
system configuration. Refer to bit 0 of Register 4 - Address
0100 on page 33 for more information on selecting the
circuit breaker cycle time.
Figure 6. Circuit Breaker Reset with RESET# Low
Quick-Trip
TM
Circuit Breaker
The SMH4804 provides a Quick-Trip feature that causes
the circuit breaker to trip immediately if the voltage drop
across
exceeds V
QCB
. The Quick-Trip level may be set
to 60mV, 100mV (default), 200mV, or the feature may be
disabled. Refer to bits 1:0 of Register 2 - Address 0010 on
page 31 for more information.
Figure 7 shows the circuit breaker ‘Quick Trip’ response.In
this figure, the voltage rises above V
QCB
, causing VGATE to
be deasserted.
Figure 7. Circuit Breaker Quick Trip Response
Current Regulation
The current regulation mode is an optional feature that
provides a means to regulate current through the MOSFET
for a programmable period of time using bits 1:0 of Register
6.
CBSENSE
VGATE
T
CBD
T
CBD
T
CYC
2050 Fig03 1.0
50mV
2050 Fig04 2.1
CBSENSE
RESET#
VGATE
T
CBD
T
PDD
50mV
T
CBRST
2050 Fig05 2.0
CBSENSE
VGATE
<T
CBD
T
FSTSHTDN
50mV
V
QCB
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SMH4811A 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:DISTRIBUTED POWER HOT SWAP CONTROLLER
SMH4811A_09 制造商:SUMMIT 制造商全稱(chēng):SUMMIT 功能描述:Programmable Distributed Power Hot-Swap Controller for High-Availability Systems
SMH4811AG 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:DISTRIBUTED POWER HOT SWAP CONTROLLER
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