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參數(shù)資料
| 型號： | MAX5948A |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | -48V Hot-Swap Controllers with External RSENSE |
| 中文描述： | -48V熱插拔控制器，外置RSENSE |
| 文件頁數(shù)： | 8/18頁 |
| 文件大小： | 685K |
| 代理商： | MAX5948A |
M
-48V Hot-Swap Controllers
with External R
SENSE
8
_______________________________________________________________________________________
Power-Supply Ramping
The MAX5948A/MAX5948B can reside either on the
backplane or the removable circuit board (Figure 6a).
Power is delivered to the load by placing an external
n-channel MOSFET pass transistor in the power-
supply path.
After the circuit board is inserted into the backplane and
the supply voltage at V
EE
is stable and within the under-
voltage and overvoltage tolerance, the MAX5948A/
MAX5948B turn on Q1. The MAX5948A/MAX5948B grad-
ually turn on the external MOSFET by charging the gate
of Q1 with a 45μA current source. Capacitor C2 provides
a feedback signal to accurately limit the inrush current.
The inrush current can be calculated:
I
INRUSH
= (I
PU
x C
L
) / C2
where C
L
is the total load capacitance, C3 + C4, and
I
PU
is the MAX5948_ gate pullup current.
Figure 6b shows the inrush current waveform. The cur-
rent through C2 controls the GATE voltage. At the end
of the DRAIN ramp, the GATE voltage is charged to its
final value. The GATE-to-SENSE clamp limits the maxi-
mum V
GS
to about 18V under any condition.
Board Removal
If the card is removed from a live backplane, the output
capacitor on the card may not be immediately dis-
charged. While the output capacitor is discharging, the
MAX5948_ continues to operate as if the input supply
were still connected because the output capacitor tem-
porarily supplies operating current to the IC. If the cir-
cuit is connected as in Figure 7a, the voltage at the UV
pin falls below the UVLO detect threshold, and the
MAX5948_ turns off the external MOSFET. If R4 in the
circuit is connected directly to the -48V return, the
external MOSFET remains on until the capacitor is dis-
charged sufficiently to drop the UV pin voltage to the
UVLO detect threshold.
In either case, when the MOSFET is turned off, the out-
put capacitor continues to discharge by the IC supply
current I
DD
. The I
DD
flows into the IC at the V
DD
termi-
nal, out at the V
EE
terminal, and back to the capacitor
through the substrate diode of the external MOSFET.
There is also a parallel current path between the V
EE
and DRAIN terminals through multiple internal ESD-pro-
tection diodes. The protection circuit built into the IC
allows the DRAIN terminal voltage to drop below that of
LOGIC
AND
GATE DRIVE
V
CC
AND
REFERENCE
GENERATOR
REF
V
CC
REF
V
PG
V
EE
50mV
V
DD
UV
OV
V
EE
SENSE
GATE
DRAIN
PWRGD
PWRGD
MAX5948A
MAX5948B
OUTPUT
DRIVE
Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5948AESA | -48V Hot-Swap Controllers with External RSENSE |
| MAX5948B | 4-2-3-2 Input AND-OR-invert Gates 14-CDIP -55 to 125 |
| MAX5948BESA | -48V Hot-Swap Controllers with External RSENSE |
| MAX5949 | -48V Hot-Swap Controllers with External RSENSE |
| MAX5949AESA | -48V Hot-Swap Controllers with External RSENSE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5948AESA | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5948AESA+ | 功能描述:熱插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5948AESA+T | 功能描述:熱插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5948AESA-T | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5948BESA | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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