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參數(shù)資料
| 型號(hào)： | SMH4812S |
| 廠商： | Summit Microelectronics, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Distributed Power Hot-Swap Controller |
| 中文描述： | 分布式電源熱插拔控制器 |
| 文件頁數(shù)： | 10/19頁 |
| 文件大小： | 441K |
| 代理商： | SMH4812S |
10
SMH4812
Preliminary
2055 4.0 12/22/00
SUMMIT MICROELECTRONICS, Inc.
Current Regulation
The current regulation mode is an optional feature that
provides a means to regulate current through the MOS-
FET for a programmable period of time. See Figures 5a
and 5b. If enabled the device will start the internal timer
when the voltage at CBSENSE exceeds 50mV (A & G, H).
Also, it attempts to limit the voltage at CBSENSE to 60mV
by regulating the VGATE output (B & C vs. I). The circuit
breaker will trip if the over-current condition remains after
the time-out (D, E, F; & J, K, L). However, if CBSENSE
drops below 50mV before the timer ends, the timer is reset
and VGATE resumes normal operation. If the Quick-Trip
level is exceeded then the device will bypass the current
regulation timer and shut down immediately. The Current
Regulation feature is disabled in the default configuration.
Non-Volatile Fault Latch
The SMH4812 also provides an optional nonvolatile fault
latch (NVFL) circuit breaker feature. The nonvolatile fault
latch essentially provides a programmable fuse on the
circuit breaker. When enabled the nonvolatile fault latch
will be set whenever the circuit breaker trips. Once set, it
cannot be reset by cycling power.
N
OTE
: T
HE
DEVICE
REMAINS
PERMANENTLY
DISABLED
UNTIL
IT
IS
REPROGRAMMED
AT
THE
FACTORY
.
As long as the NVFL is set, the FAULT# output will be
driven active. The Non-Volatile Fault Latch feature is
disabled in the default configuration.
Resetting FAULT#
When the circuit breaker trips the VGATE output is turned
off and FAULT# is driven low. In the default condition the
breaker resets automatically after a time of t
CYC
. In the
latched condition cycling power to the board or toggling the
EN/TS input will also reset the circuit breaker. If the over
current condition still exists after the MOSFET switches
back on, the circuit breaker will re-trip.
Figure 5.a. Current Regulation & Shutdown
Figure 5.b. Current Regulation & Shutdown
VGATE
0V
0V
FAULT#
CBSENSE
50mV
12V
1
0
A
D
C
B
E
F
2055 Fig05a
VGATE
0V
0V
FAULT#
CBSENSE
50mV
12V
1
0
G
J
H
K
I
L
2055 Fig05b
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|---|---|
| SMH4814 | Dual Feed Active-ORing Programmable Hot Swap Controller |
| SMH4814NCR00 | Dual Feed Active-ORing Programmable Hot Swap Controller |
| SMH4814NCR01 | Dual Feed Active-ORing Programmable Hot Swap Controller |
| SMH4814NCR02 | Dual Feed Active-ORing Programmable Hot Swap Controller |
| SMH4814NCR03 | Dual Feed Active-ORing Programmable Hot Swap Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SMH4814 | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Dual Feed Active-ORing Programmable Hot Swap Controller |
| SMH4814NCR00 | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Dual Feed Active-ORing Programmable Hot Swap Controller |
| SMH4814NCR01 | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Dual Feed Active-ORing Programmable Hot Swap Controller |
| SMH4814NCR02 | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Dual Feed Active-ORing Programmable Hot Swap Controller |
| SMH4814NCR03 | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Dual Feed Active-ORing Programmable Hot Swap Controller |
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